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Gas reducer with high output pressure. Gas reducers for household cylinders. How and why gearboxes are used

The gas reducer is designed to stabilize the operation of the gas supply system. Its main task is provide gas supply, the pressure value of which is optimal for the normal operation of gas pipeline network equipment. The responsibilities of the gearbox include automatically maintaining the operating pressure in the proper condition.

Classification of gas regulators

Before using a pressure reducer, you should familiarize yourself with its types and the main parameters by which these devices are classified.

Principle of operation

According to the principle of operation, gas appliances are of direct and reverse type.

In gearboxes direct view gas passing through the fitting acts on the valve using a spring, pressing it against the seat, thereby blocking gas from entering the chamber high pressure. After pressing the valve membrane away from the seat, the pressure gradually decreases to the operating level of the gas appliance.

Operating principle of the device the reverse type is designed to compress the valve and block further gas supply. Using a special adjustable screw, the pressure spring is compressed, the membrane is bent, and the transfer disk acts on the return spring. The service valve is raised and gas flow to the equipment is resumed.

When the system pressure increases (cylinder, reducer, work equipment) in the gearbox, with the help of a spring, the membrane is straightened. The transfer disk, moving down, acts on the return spring and moves the valve towards the seat.

It should be noted that household reducers for reverse-action gas cylinders are safer.

Installation features

Based on positioning and installation features, devices are divided into ramp, network and balloon.

Ramp gas regulators are necessary to reduce and stabilize the gas pressure level supplied by one source. The devices tend to reduce the operating pressure of gas supplied from a central pipeline or a number of sources. Used for large volumes welding work. Network stabilizers keep the value low gas pressure supplied from the manifold distributions.

Types of working gas

The specifics of operation, as well as the method of connecting the pressure regulator to the source, depend entirely on the properties of the working gas. According to the material used, the devices are as follows:

acetylene (A);

propanobutane (P);

oxygen (K);

methane (M).

Devices working with acetylene are fixed using a clamp and a stop screw, while for others they use a union nut with a thread identical to the thread of the fitting at the valve.

Housing color and regulator type

Propane reducers are painted red, acetylene - white, oxygen - blue, carbon dioxide - black. The color of the housing corresponds to the type of working gas medium.

Pressure stabilization devices They are available for working with flammable and non-flammable media. The difference between them lies in the direction of the thread on the cylinder: for the first it is left-handed, for the second it is right-handed.

Specifications

Gas pressure stabilization devices are characterized by maximum throughput and maximum outlet pressure.

The throughput of the regulator displays the maximum number of cubic meters of blue fuel processed within an hour. Industrial devices are capable of passing up to several hundred cubic meters per hour, while household devices are content with a few cubic meters.

The maximum gas pressure at the outlet is usually 1.6 atmospheres.

Reducers for household cylinders

A special group includes a household gas reducer. It is designed to reduce the pressure of propane, which flows from the cylinder into the furnace or gas boiler. Reducers used for stable operation of the cylinder have different shapes, dimensions, throughput, and weight.

For storage and transportation To obtain gas in a compressed and liquefied state, special gas cylinders have been developed - containers in which substances are contained under high pressure. There are two types of cylinders:

  • metal,
  • composite.

Gas regulator for composite cylinders

Composite cylinders, which successfully replace oversized and unsafe samples, are compact, weigh less and are more explosion-proof, and do not corrode inside. The operating conditions of new type cylinders require the use of regulators that meet the requirements of European standards.

One of these modifications is a reducer for a composite gas cylinder A300i-A310i, which has its own characteristics:

  • free-tightening nut;
  • Regulator gasket service life is 10 years;
  • design that ensures reliable tightness of connections.

Application and selection of gearboxes

Gearboxes that stabilize operation various types gas are used in many industries, agriculture, construction and medicine.

For example, in the process of gas cutting with welding equipment, gearboxes are used to regulate the supply of oxygen, and acetylene ones are used when working with a car body at a service station or when repairing and installing a pipeline, by public utilities. In the retail industry, carbon dioxide reducers are used to saturate bottled drinks with carbon dioxide.

The main purpose of propane pressure stabilizers is the intake and regulation of gas from cylinders to gas stoves, although they are successfully used and at construction work with a roof. A propane cylinder reducer is necessary when heating a private home.

When choosing a gas reducer for a cylinder with an outlet pressure regulator, you must take into account all the details: the gas that will serve the device, the type of gas cylinder used, what length and diameter the gas hose will have, what type of adapter for the cylinder is used.

If you select the wrong device, it is possible side effects, the regulator may whistle or hum. Therefore, it is recommended to operate gas equipment and regulators from the same manufacturer.

It's important to know why gas cylinder equipped with a pressure regulator and why this information is important. Each household regulator for a gas cylinder has its own specific purpose and is designed to work with a specific type of gas. Proper Use gas equipment - a guarantor of uninterrupted supply and safe operation of blue fuel.

A gas reducer is a device designed to reduce the gas pressure in a gas cylinder and maintain this pressure optimal. The gas reducer in the LPG kit (gas equipment for a car) performs exactly these functions: it maintains the pressure value in the gas cylinder that is optimal for correct operation of the system, regardless of the pressure, for example, in the gas pipeline.

The use of gas reducers, however, is not limited exclusively to gas-cylinder equipment in cars. They are used both in household gas cylinders (for example, in the absence of a central gas pipeline in summer cottages), and in industry (during the transition from a large central gas pipeline to local network), etc.

Types of gearboxes:
  • injection;
  • vacuum;
  • electronic.

Operating principle of the gas reducer

First of all, we note that for proper operation of the LPG kit in general, and the gas reducer in particular, the car should be warmed up, especially in autumn and winter.

Gas from the gas cylinder first enters the reducer, and then into the carburetor or injector. There is a special membrane at the gas inlet and outlet. If the gas pressure is low, the reducer diaphragm keeps the valve open and gas flows into the cylinder until the pressure rises. The valve then closes and no gas can flow. These are both the regulating and control functions of the gas reducer.

How to choose a gas reducer

We advise you to focus on the manufacturing company and choose from market leaders, without skimping on quality. You should also keep in mind the engine power of your car and check whether a particular gearbox is suitable for it.

Adjusting the gas reducer

Adjusting the gas valve is a responsible matter. And you should only take on it yourself if you are an HBO specialist and confident in your abilities. Otherwise, we advise you to contact a professional service center. Moreover, such services are last years more and more began to appear.

Remember that improper adjustment of the gas reducer can lead to gas leakage and uncontrolled increase and/or drop in pressure in the gas cylinder. There is no need to talk about how dangerous this can be.

As a rule, if problems occur in the gas reducer, they can be eliminated by replacing one or another part of the reducer, if the reducer is dismountable. If it is non-separable, then you will need to buy a new gearbox.

If you take on the task of adjusting the gas reducer yourself, then start by setting the idle speed. Then, after each throttle release, unscrew the sensitivity screw a quarter turn until you get the correct response to a sharp throttle opening.

After this you need to adjust the feed. Use the throttle to increase engine speed to 3000 rpm, then tighten the gas supply metering screw (screw) until the speed begins to decrease.
Then you can try it out for a drive and see how responsive the equipment is to your actions.

Installation of a gas reducer

It is better to entrust the installation of the gas reducer, as well as the adjustment, to specialists in service centers. However, we can describe general scheme installations.

The gearbox should be securely secured vertically at three points on the body. It should be installed above the top level of the radiator, as close to the mixer as possible. Gas is supplied to the gearbox through a solenoid valve, which should not come into contact with the body. The adjusting screw and drain fitting must be freely accessible.

The cooling system is connected through conductors and tees. Then install the solenoid valve (it is through it that gas will flow into the cylinder when filling), it must also be securely fastened. After all these steps, a gas line is supplied, it is secured under the bottom of the car using self-tapping screws and brackets away from the heating and moving parts of the car and in no case should it come into contact with the road surface.

The final stages of installing the gas reducer is wiring. You will find the diagram to follow in the instructions for your LPG kit.

The gas in the cylinder is in the form of a liquid; it turns into a gaseous state and is supplied to the gas equipment through a valve.

The pressure in the tank is significantly higher than what is required for consumers. To reduce and stabilize it, a simple and useful device is used - a propane reducer, or adapter.

Classification depending on the scope of application

Depending on the scope of application, reducers for gas cylinders are divided into several types:

  • Universal adjustable
  • Professional.

This type includes the simplest gearboxes used in domestic gas supply to households and in hiking conditions. RDSG reducers are installed together with household gas cylinders. They have the simplest design, allowing the use of gas only in household stoves and are inexpensive and reliable. The frog reducer for a gas cylinder, or RDSG-1, is used in conjunction with containers from 12 to -50 liters.

For five-liter gas cylinders, popular among summer residents, tourists and hunters, the RDSG-2 Baltika model is used. The Baltika reducer is put on the nipple of the gas cylinder from above and fixed in the rubber seal with a special clamp. The gearboxes are configured for an operating pressure of 0.3 MPa and a throughput of 1.2 m 3 / hour

Universal adjustable

This class of gearboxes has a more complex design and wider capabilities. They can already be used both for domestic gas supply and for work in a home workshop. These reducers have a mandatory threaded connection to the gas cylinder, which securely locks the device.

They are also equipped with a pressure gauge and an adjusting screw that allows you to change the operating pressure from 0 to 0.3 MPa, depending on the needs of the gas consumer device connected to them. These devices also have a greater throughput than household ones - up to 5 m 3 / hour

Professional

This class is characterized by the use of more wear-resistant materials and best quality assembly and adjustment. The operating pressure adjustment parameters are also wider – from 0.4 to 1.6 MPa.

Some models are equipped with two pressure gauges - for inlet and operating pressure, respectively.

Features of using composite gas cylinders

Composite gas cylinders in Lately are becoming increasingly popular. This is due to their advantages over their steel counterparts.

  • Weight. Almost twice as light as steel.
  • Ease of handling. There are comfortable handles.
  • Transparency. The fill level can be easily seen.
  • Convenient storage. Can be placed one on top of the other and stacked.
  • Life time. The service life is practically unlimited.
  • Operational safety. It is caused by the absence of sparking and a safety valve and fusible link built into the gas cylinder.

Supplied at Russian market Composite cylinders are produced in the Czech Republic, Norway and India. When purchasing such a cylinder, it is necessary to clarify the connection standard. If the gas cylinder is equipped according to the Russian standard, you can use a regular reducer for the gas cylinder. If the gas cylinder comes with a European connector, then you will need to either order an adapter or purchase an imported reducer. Please note that each additional connection increases the risk of gas leakage.

What is a propane reducer?

The design of all propane reducers is very similar. They all have:

  • Sealed housing made of aluminum, brass or plastic.
  • Inlet pipe for connection to the cylinder.
  • Outlet pipe for connection to the consumer.
  • High and low pressure.
  • Flexible membrane.
  • Valve and stem.
  • Return spring.
  • Working spring.

In professional gas reducers, a pressure gauge, adjusting screw or flywheel are added to the design, threaded connection supply pipe. The gearbox housing has a cylindrical shape, which is due to the use of a round membrane that bends inside the operating pressure chamber. The inlet and outlet pipes protrude from the housing.

How to choose a reducer for a household propane cylinder

To select a propane reducer for a gas cylinder, it is necessary to study and compare their characteristics. The most significant are:

  • Purpose.
  • Maximum inlet pressure, kg/cm3.
  • Working pressure, kg/cm3.
  • Maximum gas consumption, m 3 /hour.
  • Connection standard.
  • Planned service life.
  • Price.

Depending on the intended application and the planned type of cylinder best choice may be one or another model. So, for example, if you plan to connect a tabletop gas stove in a garden house that you visit on weekends (or take it on a boat trip) and estimate your monthly gas consumption to be five liters, a five-liter cylinder and a Baltika RDSG-2 gas reducer are best suited.

For a stationary stove with an oven, you will already need a cylinder with a capacity of 27 or 50 liters and, accordingly, a Frog RDSG-2 gearbox.

If you want to connect a composite cylinder to a thermal umbrella, and both the cylinder and the umbrella have European connectors, then it makes sense to consider imported gas reducers with a KLF connector, for example, produced by the German company GOK.

If you plan to carry out gas welding in a home workshop, then a professional gas reducer BPO 5-3 Krass would be a good choice. It provides a maximum flow rate of up to 5 m 3 per hour and the ability to regulate operating pressure up to 0.4 MPa. To do this, it is equipped with an adjusting flywheel and a pressure gauge, which allows you to more accurately set the operating pressure in accordance with the needs of the gas welding torch or cutter.

Precautionary measures

Household gas is very dangerous. The main threats posed by propane are:

  • Fire hazard.
  • Unsuitable for breathing.
  • Explosion hazard when the maximum concentration of propane in the air is reached, as well as when the temperature in a closed volume rises sharply.
  • During a gas leak, the temperature drops sharply and frostbite is possible.

To preserve the life and health of people and their property, precautions should be taken:

  • Avoid proximity to open flames and heat sources.
  • Exclude presence in work area other flammable materials.
  • Eliminate the presence of nitrates and perchlorates near gas equipment due to their chemical activity.
  • Do not use the reducer for a propane cylinder if it is damaged or leaking.

Design features and maintenance

According to their design, gearboxes differ into direct and reverse acting devices. The differences between them are in the design details, the performance characteristics are identical.

In addition, gas reducers are used in single-stage and two-stage types. In single-stage, the pressure is reduced in one stage. In a two-stage reduction, the reduction is carried out in two steps. Balloon single-stage reducers are most widely used due to their reliable design and ease of use.

Diagram of direct and reverse acting devices

Direct-type devices have the following operating scheme: propane entering the high-pressure zone presses the valve away from its seat. Propane enters the working chamber, filling it and increasing the pressure in it. It acts on the membrane, compressing the main spring. The membrane goes down, pulls the stem and closes the valve when the operating pressure value is reached. During the use of propane, the pressure in the working chamber drops, high-pressure propane opens the valve again and gas enters the working area again.

In reverse type devices, the valve is opened by the main spring, overcoming the force of the high pressure gas. After the working area is filled and the pressure reaches the set value, the rod moves down, closing the valve. As propane is used, the pressure in the working area decreases and the spring opens the valve again.

Reverse-acting devices are considered more reliable and safe. They have gained popularity in household and professional applications.

Periodic inspection and service work

Inspections and service work are divided into daily and periodic.

Daily inspections are required before starting work. Periodic checks are usually carried out in specialized workshops. For gearboxes equipped with a filter, the work includes cleaning or replacing it

Typical faults and their repair

Deviation of the operating pressure from the specified one can be caused by the following reasons:

  • Spring breakage or displacement.
  • Depressurization of the housing.

Gas leakage is caused by:

  • Membrane damage.
  • Depressurization of the housing.
  • Valve failure.

Some gearboxes are made collapsible. They are, in principle, available for self-repair. Non-separable gas reducers, of course, in the event of a malfunction must be replaced entirely.

Important! Remember that when disassembling the gearbox, you accept full responsibility for the consequences of its use.

So, for example, a home craftsman who has basic plumbing skills is quite capable of replacing a spring or membrane in an unregulated “Frog” gas reducer. A housing with a damaged seal cannot be repaired. In this case, the entire device will have to be replaced.

After replacing damaged parts with new ones from the repair kit and assembling the gas reducer, it is necessary to check its tightness using a soap solution.

System connection standards

Devices that support two standards for connecting the reducer to a gas cylinder are widespread:

  • GOST - common in the CIS countries, used on locally produced steel cylinders.
  • GLK is a European standard, used primarily on composite cylinders.

To connect the working pipe:

  • Threaded connection.
  • Nipples 6.3 or 9 mm.
  • Universal nipple.

Some gas reducers, for example, RGDS, are equipped at the factory with a 9 mm nipple pressed into the housing.

Reducers with adjustable operating pressure are equipped with a threaded half-inch outlet, which can optionally be secured with a union nut and a universal nipple.

It is safer to use devices that match the standard. Each adapter is an additional connection that increases the risk of gas leakage.

Installation and startup procedure

In order to ensure fire safety The following procedure for installing and starting up the equipment should be observed:

  1. Carry out a thorough external inspection of the container, gas reducer and pipelines and ensure that there are no visible defects or excessive heat.
  2. Connect the reducer to the gas cylinder.
  3. Connect the consumer device to the gearbox
  4. Open the cylinder valve slightly and listen.
  5. Open the gearbox valve (if present).
  6. Open the valve of the consumer device and start using it.

If there is a whistling or clicking noise, immediately close the gas cylinder valve.

Required pressure and volume

The key characteristics of a gas reducer are inlet pressure, operating pressure and flow rate, or the maximum volume of gas passing through the device in an hour.

The inlet pressure is determined by the standard pressure in the cylinders and is usually 20 MPa.

The operating pressure for household unregulated gas reducers is set at 0.3 MPa ±5%

For adjustable semi-professional and professional adapters, the operating pressure is set by the user in the range of 0-0.4 MPa, and for certain high-performance models - up to 1.6 MPa

The consumption volume must exceed the volume consumed by the device (or group of devices) per hour.

Adjustable gas reducers operate on the same physical principles as non-adjustable ones and have a similar design. The difference is that the compression force of the reducing spring supporting the membrane can be changed using an adjusting screw coaxial with the spring in the simplest models, or using a flywheel and a more complex mechanical transmission.

The principle of operation is that by changing the pre-compression force of the reduction spring, the user changes the threshold gas pressure in the working chamber required to operate and close the intake valve. A pressure gauge is also added to the parts, installed on the working pipe and allowing you to visually monitor the result of the adjustment.

General rules for choosing a balloon reducer

Summarizing the rules for choosing a gearbox for a gas cylinder, it should be noted that:

  1. it is necessary to sketch out a diagram of the planned system from the gas cylinder to the end user;
  2. clearly formulate the following requirements for the device:
  • Purpose.
  • Operating pressure.
  • Need for adjustment.
  • Maximum volume.
  • Method of connection to a gas cylinder and to a working device.
  • Availability of maintenance and repair.
  • Allotted budget.
  1. From the variety of products on the market, you should choose those that meet the stated requirements.
  2. Next, you need to enter the models and their characteristics into the comparison table and conduct a price analysis.

If devices that meet the stated requirements do not fit within the allotted budget, then it is necessary to either revise the budget or simplify the requirements for the device.

Area of ​​application of devices

Wherever there is no stationary gas distribution, people use propane in cylinders. And each cylinder is connected to one or another reducer. The most popular applications are:

  • Household and portable stoves and grills.
  • Gas water heaters and heat guns for heating rooms.
  • Thermal umbrellas for heating recreation areas.
  • Gas cutters and welding torches.
  • Fuel for land and river transport.

In many countries, wide gas distribution networks have been created to ensure recharging and delivery of gas cylinders to consumers.

The gas cylinder reducer ensures safe and stable operation of gas consuming devices.

A frog for a gas cylinder is one of the most common types of gas reducers.

It is a pressure stabilizer and is often an indispensable part of gas equipment. The pressure in a gas cylinder is not a constant value and depends on many factors, such as the fullness of the cylinder and its temperature, the type of filler gas and others. For normal operation of most devices, a certain set pressure is required. To match the gas pressure at the outlet of the cylinder and the pressure at the inlet to the device, a gas reducer is used. Gas reducers differ in financial assistance grants according to such indicators as:

  • highest throughput;
  • the highest gas pressure at the inlet to the device;
  • highest operating pressure at the outlet;
  • according to the type of gas for which it is intended.

All this data is indicated in the product passport and must comply with GOST standards.

Please note that gearboxes for flammable and non-flammable gases have different thread directions and colors. In addition, when choosing a gearbox, you should ensure that its throughput is sufficient online loans instant approval bad credit for the normal operation of connected devices and equipment.

How does a frog fit on a gas cylinder?

The frog reducer for a gas cylinder has a structure typical for this type of device. The operating principle of the gearbox is based on the counteraction of the pressure of the membrane and the spring. Depending on the spring and diaphragm characteristics, gearboxes will have different inlet and outlet pressures and therefore different applications.

Some types of gearboxes may have additional device to adjust the pressure level in the reducer, however, the “frog” is not equipped with these parts and is an unregulated reducer.

Gearboxes of this type, due to their simplicity and reliability, as well as low price, have become widespread. They are required to be equipped with propane cylinders for household use; they are included in automotive gas and gasoline equipment, heating and welding equipment, as well as in industry and production.

How to set up a frog gas reducer? Is the frog reducer for a gas cylinder repairable?

To set up and adjust the frog gas reducer, you need certain skills and experience. Without proper qualifications, it is undesirable to perform such procedures, as this may negatively affect the stability of the device, its reliability and safety. After setting up the gearbox, it is necessary to check its tightness and regularly monitor it subsequently.

The consequence of a breakdown or incorrect adjustment of the gearbox is the occurrence of a leak. The cause of depressurization of the device may be failure of the membrane, valve or spring.

Only a dismountable, leaking frog reducer for a gas cylinder can be repaired. In this case, payday loans gallatin tn it is possible to both replace damaged parts and adjust them using gaskets. However, often the resulting effect will not last long and will not be worth the effort.

A frog-type reducer for a gas cylinder is an inexpensive and reliable device necessary for the safe and comfortable operation of gas equipment.

Liquefied gas, which is used to fill cylinders for subsequent use, is always under increased pressure. To lower it, it is necessary to install a special type of shut-off and distribution valves on the cylinder - a propane reducer. Subsequently, the reducer automatically maintains the specified level of gas pressure. According to safety regulations, the device is always painted bright red - the same color as propane cylinders.

Design and types

Propane (CH 3) 2 CH 2 is a natural gas with a high calorific value: at 25°C its heat of combustion exceeds 120 kcal/kg. At the same time, it should be used with special precautions, since propane is odorless, but even with its concentration in the air of only 2.1% it is explosive. It is especially important that, being lighter than air (the density of propane is only 0.5 g/cm3), propane rises upward, and therefore, even at relatively low concentrations, poses a danger to human well-being.

A propane reducer must perform two functions - provide a strictly defined level of pressure when connecting any device to it, and guarantee the stability of such pressure values ​​during further operation. Most often, gas welding machines, gas heaters, heat guns and other types of heating equipment are used as such devices. This gas is also used for the propane cylinder of a car running on liquefied fuel.

There are two types of propane reducers - single- and double-chamber. The latter are used less frequently because they are more complex in design, and their distinctive ability to consistently reduce the gas pressure in two chambers is used in practice only with increased requirements for the permissible level of pressure drops. Common models of gearboxes are BPO 5-3, BPO5-4, SPO-6, etc. The second number in the symbol indicates the nominal pressure, MPa, at which the safety device is activated.


Structurally, a single-chamber propane reducer type BPO-5 (Cylinder Propane Single-Chamber) consists of the following components and parts:

  1. Cases.
  2. Pusher.
  3. Valve seat.
  4. Reducing spring.
  5. Membranes.
  6. Reducing valve.
  7. Connecting nipple.
  8. Inlet fitting.
  9. Setting spring.
  10. Mesh filter.
  11. Pressure gauge.
  12. Adjusting screw.

The main technical characteristics of propane reducers are:

  • Maximum throughput capacity in terms of gas volume per unit of time, kg/h (marked with a number located immediately after the letter abbreviation; for example, a propane reducer type BPO-5 is designed to pass no more than 5 kg of propane per hour);
  • Maximum gas inlet pressure, MPa. Depending on the size of the device, it can range from 0.3 to 2.5 MPa;
  • Maximum outlet pressure; in most designs it is 0.3 MPa, and is adapted to a similar indicator for a gas-consuming unit.

All produced propane gearboxes must fully comply with the requirements of GOST 13861.

Operating principle of the gearbox

The device is connected to a gas cylinder using a union nut, the thread on which is strictly defined: Sp21.8LH (left). This is done in order to exclude the possibility of connecting a gearbox for other equipment. The connecting nut is made of brass and is necessarily equipped with a transition projection, which prevents possible gas leaks. When using propane cylinders manufactured according to the European standard KLF with an already installed sealing ring and a filter on the fitting, you will also need a special adapter.

A propane reducer works like this. The gas from the cylinder first passes through a mesh filter, from where it enters the lower chamber at high pressure. Next, the required operating pressure is adjusted. To do this, the adjusting screw is rotated clockwise, acting on the set spring. The spring pushes the pressure plate, and through the reducing spring, pusher and diaphragm transmits force to the reducing valve. It opens, and through the gap between the valve and its seat, it opens the way for propane into the working chamber. A low pressure gauge is used to monitor the actual gas pressure. In order to connect the hose of a gas burner, cutter or other unit to the device, an output connecting nipple is provided. For connection, a union nut with an M16×1.5LH thread is usually used.


When gas is supplied under initial pressure, the following occurs: the membrane closes the inlet valve (the level of pressure required for this depends on the area of ​​the membrane, its diameter and the setting of the drive spring). The level of propane pressure at the outlet of the reducer depends on the degree of blocking of the hole. Since the membrane moves abruptly when high-pressure gas is supplied, household gas reducers of this type are often called “frog”. “Frog” is a typical representative of a propane reducer, which is used to supply gas to simple household devices. Unlike the above-mentioned devices BPO 5-3, BPO 5-4, etc., the “frog” does not have a unit for adjusting the inlet gas pressure, and its performance is determined solely by the physical and mechanical characteristics of the membrane material. Therefore, such gearboxes are designed for use strictly in the conditions specified by the manufacturer. “Frogs”, as a rule, have reduced operational capabilities (in particular, flow rate and outlet pressure), but are more compact and have a lower price (290...350 rubles versus 450...700 rubles - for single-chamber devices or 1200...1300 rub. - for two-chamber). The “frog” can be connected using a clamp.

How to choose a propane reducer model?

Mandatory conditions for the industrial production devices under consideration must be:

  1. The presence of a metal cover that fits tightly to the body.
  2. Indelible marking indicating the pressure parameters for which the device is designed.
  3. Universal connection nipple for commonly used hose diameters (6.3 mm, 9 mm).
  4. Tight fit of all sealing parts (gaskets) to the corresponding surfaces. Usually, to check this, use a soap solution, when applied to the surface, no air bubbles should form
  5. Brass body (steel is prone to rust).
  6. Convenient handwheel for moving the adjusting screw.
  7. Spare gasket (optionally, an adapter for propane cylinders of European standard, Swedish or Norwegian production can also be included).
  8. Compliance with domestic safety standards - GOST 12.2.052 - 81.

In the process of choosing the standard size of a propane reducer, the permissible level of external temperatures at which its use does not pose a danger to others is also taken into account. Typically, the climatic class of these devices is UHL2, which allows the use of the gearbox in the temperature range of -25...+50°C. For the UHL class (temperate zone), the corresponding range is -15...+45°C. The coefficient of unevenness of the transmitted pressure should not exceed ±0.15.


The external condition of the device is also important for the possibility of using the gearbox. The body of the propane gearbox should not have surface dents or scratches, not to mention changes in shape. The same applies to the condition of the control pressure gauge. Before installing it in a stationary state, the pressure gauge should be checked for serviceability by supplying compressed air: if the instrument pointer is motionless, the gearbox cannot be used.

The purchased device must be fully consistent with the technical characteristics of the unit for which it is intended. In particular, gas consumption cannot exceed the operating characteristics of the gearbox. If the pressure at the outlet of the gearbox exceeds (compared to the nominal values), the automatic control of the main equipment, as a rule, fails, and the equipment itself is switched off. The limit values ​​of the pressure used should not exceed the permissible values ​​for equipment of this class by more than 10%. The device must have a certificate of conformity in Russia.

Sequence of installation and use

A propane reducer of any type and design is considered a high-risk technique, therefore, when installing it, a number of mandatory requirements must be observed:

  1. The room (if the gearbox is mounted to an internal consumer) is thoroughly ventilated. Moreover, the window/vent must remain open throughout the entire duration of the initial start-up.
  2. The correct sequence for using the device is as follows: first, the valve on the propane cylinder opens smoothly. Then the valve of the reducer opens and only then the valve of the gas-consuming equipment. By rotating the adjusting screw handwheel, the required level of operating pressure is set. Disabling is done in reverse order. When extraneous sounds– clicks, hissing, etc. – the equipment immediately turns off.
  3. After establishing a stable flow of gas through the reducer, monitor the readings of the pressure gauge needle, which should not deviate more than the pressure fluctuation values ​​indicated in the passport. IN otherwise the use of technology is stopped. A slow increase in gas pressure is considered especially dangerous.


  1. Once every 2...3 months, the tightness of all connections is checked, and if necessary, the threaded fasteners are tightened.
  2. If routine maintenance of the propane reducer is necessary - purge the valve - the device is disconnected from the gas main, after which the remaining gas is released from all working cavities of the device. All subsequent operations are performed only in special workshops that have test benches.
  3. After finishing use, the inlet valve on the gearbox is closed all the way. In this case, the binding of the spring is eliminated, and its performance increases.
  4. To comply with fire safety rules, it is advisable to provide flame extinguishing devices between the gearbox and the gas-consuming installation.

Gearbox design. Reducers serve to reduce the gas pressure taken from the cylinder and automatically maintain the operating pressure constant, regardless of the drop in gas pressure in the cylinder. According to GOST 6268, stationary gearboxes are released to the operating gas pressure in front of the burner or cutter: for oxygen - from 0.5 to 15 kgf/cm2, for acetylene - from 0.01 to 1.5 kgf/cm2. There are many designs of gearboxes, but the principle of operation and their main parts are approximately the same.

A diagram of the design and operation of the gearbox is shown in Fig. 78.

Compressed gas from the cylinder enters high-pressure chamber 1. The pressure in front of the reducer is determined by pressure gauge 2. Next, the gas passes through valve 11, overcoming significant resistance, as a result of which the gas pressure behind the valve becomes lower. Having passed the valve, the gas enters low-pressure chamber 10. The pressure in the chamber is determined by pressure gauge 3. From the low-pressure chamber, gas is supplied to the burner through valve 6.

Membrane (rubber plate with fabric gaskets) 7, adjusting screw 9 and springs 8 and 4 serve to regulate the position of valve 11, the degree of opening of which determines the operating gas pressure after the reducer. The more the valve is open, the higher the operating gas pressure and the greater the amount of gas will pass through the reducer. When screw 9 is screwed in, springs 8 and 4 are compressed, valve 11 opens and the pressure in chamber 10 increases. When screw 9 is unscrewed, on the contrary, valve 11 closes and the gas pressure in chamber 10 decreases.

The set operating pressure in the reducer is automatically maintained constant. As the amount of gas taken is reduced, its pressure will begin to increase and in the low pressure chamber 10 the gas will press with greater force on the membrane 7, which will move down and compress the spring 8.

In this case, the spring 4 will close the valve 11 and will keep it in this position until the pressure in the chamber 10 becomes again equal to its original value. The opposite phenomenon is observed when the operating pressure in chamber 10 decreases. Safety valve 5 will protect the membrane from rupture if valve 11 begins to let gas through.

By design, gearboxes are single-chamber and double-chamber. In two-chamber (two-stage) reducers, the pressure is reduced in two stages: in the first stage from an initial 150 kgf/cm 2 to an intermediate 40-50 kgf/cm 2 , and in the second stage - to a final operating pressure of 3-15 kgf/cm 2 . Two-stage reducers provide an almost constant operating gas pressure, which does not change when the pressure in the cylinder decreases as gas is consumed from it. Double-chamber gearboxes are less prone to freezing, but they are more complex in design than single-chamber gearboxes and require more non-ferrous metal for their manufacture, and are therefore more expensive.

Cylinder reducers for oxygen and acetylene are shown in Fig. 79. The acetylene reducer is similar in principle to the operating principle and design of the oxygen reducer. The difference is that for connection to the cylinder valve, acetylene reducers have a special clamp with a pressure screw instead of a union nut. Oxygen reducers are painted blue, acetylene reducers are painted white.

Reducers for other flammable gases are connected to the cylinder valve fitting with a union nut with a 1/2" left-hand pipe thread and are painted red.

For centralized oxygen supply, central (ramp) gearboxes DKR-250/500 are used, designed for a maximum throughput of up to 250 and 500 m 3 /h, at an operating pressure of 3-16 kgf/cm 2. In some cases, special gearboxes with a throughput capacity of up to 1500-6000 m 3 /h are used.

The widespread supply of gases in cylinders implies the presence of special equipment to reduce pressure and maintain its operating level, regardless of changes in the initial pressure. We offer to buy a reducer for a gas cylinder in our online store. The catalog presents a large assortment of valves for stabilizing the supply of a wide variety of gases. The price depends mainly on the type of device and its technical parameters. Our company GazExpo supplies various gases and gas-cylinder equipment in Moscow and the Moscow region. Making a purchase is very simple - just order a call back.

Criterias of choice

Gas reducer is the general name for devices that automatically maintain stable operating pressure of gas from a cylinder during operation. The variety of properties of gaseous substances determines various design solutions for equipment used with them. Depending on the gas being reduced, the following types of reducers are distinguished:

  • oxygen;
  • propane (industrial and household);
  • acetylene;
  • carbon dioxide;
  • argon;
  • nitrogen;
  • for compressed air;
  • helium;
  • for nitrous oxide.

Based on the principle of operation, there are direct and reverse acting devices. In the first case working condition decreases along with the inlet pressure of the consumed gas, and in the second, it maintains the outlet pressure, regardless of the flow rate. The design is affected by the flammability of the gas being reduced, therefore, to increase safety, gearboxes that regulate the supply of inert substances are equipped with a right-hand thread for connection, and flammable ones with a left-hand thread. It is necessary to strictly observe the compliance of the devices used with the type of gas being reduced. Inconsistency is unacceptable! In our catalog you will find a reducer for a gas cylinder with any gas!

In many situations, for example when working with a gas burner, it is necessary to change the outlet pressure. In this case, it is best to use a gas reducer for a cylinder with a regulator. Such products are usually available with one or two pressure gauges to control pressure.

Our services

A gas reducer is a mandatory device for operating gas cylinders under pressure. Moscow is a huge industrial center with great needs. The GazExpo company has been supplying gases in cylinders for domestic and industrial needs in the Moscow region for more than 10 years.

Our company has its own production of many types of gases used in industry. A reducer for a gas cylinder, adjustable using a conventional valve, is a simple and reliable solution that has proven its effectiveness in practice. We supply products from leading manufacturers of gas equipment. We have a wide selection and reasonable prices! Buying here is not only easy, but also profitable. We try to create a special purchase offer for each client that will interest him.

The reducer for a gas cylinder is designed to reduce the gas pressure at the outlet of the gas container to the operating level and automatically maintain this pressure at a given level. According to the conditions of GOST 13861, gearboxes are classified:

They differ in the color of the body and the connecting devices for fastening. Main parameters:

  • inlet pressure: up to 250 atmospheres for compressed gases and up to 25 atmospheres for liquefied gases,
  • outlet pressure: typical 1 – 16 atmospheres,
  • gas consumption: tens to hundreds of m3/hour.

The price of a gas cylinder reducer is determined depending on the configuration, technical parameters, accuracy class of the device, country of manufacture. You can buy a reducer for a gas cylinder with one or two pressure gauges. If there is only one pressure gauge, then it can be used to set a fixed output operating pressure. The presence of two pressure gauges allows you to control the pressure both in the gas container and that supplied to the consumer.

Adjustable reducer for gas cylinder

Such devices are intended for use in conjunction with gas burners and other gas equipment operating with a higher gas outlet pressure. For example, BPO 5-2 can be installed on household gas vessels with a volume of 5 to 50 liters with a valve. This model is equipped with a pressure gauge and a valve to regulate the gas pressure at the outlet. Technical characteristics of BPO 5-2:

  • outlet pressure: 2.5 MPa
  • maximum working pressure: 0.3 MPa
  • highest throughput: 5.0 m3/hour
  • weight: 0.42 kg
  • gas type: liquefied

Devices with an adjustment function are also available for compressed gases.

Reducer for household gas cylinder


These products are designed to reduce and automatically maintain the vapor pressure of liquefied hydrocarbon gas in a given range. They differ in the method of attachment to gas vessels. For vessels (volume 5 l, 12 l, 27 l) equipped with a valve, a propane reducer RDSG 2-1.2(9), 16/3.6 atm, fitting 9 is used. When it is put on the neck of the valve, the locking ring is tightened on the reducer, which is released after landing in place. For gas vessels with a volume of 50 liters, equipped with a valve, propane reducers RDSG 1-1.2(9), 16/3.6 atm, fitting 9 are used, where the connection is made by means of a union nut. A disposable gasket is installed between the fitting and the nut. The reducer for a composite gas cylinder complies with European safety standards, has a built-in mesh filter, and is designed for connection to the valve of a gas composite vessel according to the German KFL standard. We also manufacture adjustable gearboxes for composite tanks, for example N 240, low pressure, for propane - butane, with the ability to adjust 20-40 mbar, outlet: 3/8 inch, internal right-hand thread. There is a pre-installed gasket designed for 10 years of service.

Gas cylinder reducer device

Gearboxes may differ in design, but the principle of operation is the same. It is based Feedback between the pressure in the gas vessel and the pressure at the outlet of the reducer, carried out using membranes, valves and springs. These products are single-chamber, double-chamber, direct-acting, reverse-acting. In practice, reverse-action devices are most applicable as they are the most convenient and safe.

Gas reducer- a device for reducing the pressure of a gas or gas mixture located in a container (for example, in a cylinder or gas pipeline) to operating pressure and for automatically maintaining this pressure constant, regardless of changes in gas pressure in the cylinder or gas pipeline.

GOST and marking

According to GOST 13861-89, gearboxes for gas-flame processing are classified:
According to the operating principle: direct and reverse acting gearboxes;
By purpose and place of installation: balloon (B), ramp (R), network (C);
By type of gas being reduced: acetylene (A), oxygen (K), propane-butane (P), methane (M);
According to the number of reduction stages and the method of setting the working pressure: single-stage with a spring pressure setting (O), two-stage with a spring pressure setting (D), single-stage with a pneumatic pressure setting (Z).
The gearboxes differ from each other in the color of the housing and the connecting devices for attaching them to the cylinder. Reducers, with the exception of acetylene ones, are connected with union nuts, the threads of which correspond to the threads of the valve fitting. Acetylene reducers are attached to the cylinders with a clamp with a thrust screw.

Main settings

Inlet pressure is usually up to 250 atmospheres for compressed (non-liquefied) gases and 25 atmospheres for liquefied and dissolved gases. The outlet pressure is typical 1-16 atm, although other modifications are also available. Gas consumption - depending on the type of reducer and its purpose, ranges from several tens of liters per hour to several hundred m?/hour.

Principle of operation

The operating principle of the gearbox is determined by its characteristics. Direct-acting reducers have a decreasing characteristic, that is, the operating pressure decreases slightly as gas is consumed from the cylinder; reverse-acting reducers have an increasing characteristic, that is, as the gas pressure in the cylinder decreases, the operating pressure increases. Gearboxes vary in design; the operating principle and main parts are the same for each gearbox.

Fig. 1 a - reverse-acting gearbox, b - direct-acting gearbox

Reverse action gearbox (Fig. 1a) works as follows. Compressed gas from the cylinder enters the high-pressure chamber 8 and prevents the opening of valve 9. To supply gas to the burner or cutter, it is necessary to rotate the adjusting screw 2 clockwise, which is screwed into the cover 1. The screw compresses the pressure spring 3, which in turn bends the flexible rubber membrane 4 up. In this case, the transfer disk with the rod compresses the return spring 7, lifting the valve 9, which opens the hole for the passage of gas into the low-pressure chamber 13. The opening of the valve is prevented not only by the gas pressure in the high-pressure chamber, but also by spring 7, which has less force than the spring 3. Automatic maintenance of working pressure at a given level occurs as follows. If the gas intake into the burner or cutter decreases, the pressure in the low-pressure chamber will increase, the pressure spring 3 will compress and the membrane 4 will straighten, and the transfer disk with rod 5 will lower and the reducing valve 9, under the action of the spring 7, will cover the valve seat 10, reducing the gas supply to low pressure chamber. As gas extraction increases, the process will automatically repeat. The pressure in the high-pressure chamber 8 is measured by pressure gauge 6, and in the low-pressure chamber 13 by pressure gauge 11. If the pressure in the working chamber increases above normal, then the gas will be released into the atmosphere using safety valve 12. In addition to single-chamber reducers, two-chamber reducers are used, in which the gas pressure is gradually reduced in two reduction chambers located sequentially one after the other. Double-chamber (two-stage) reducers provide a more constant operating pressure and are less prone to freezing, however, they are more complex in design, so double-chamber (two-stage) reducers are used when it is necessary to maintain operating pressure with increased accuracy.

Direct acting gearboxes. In direct-acting gearboxes (Fig. 1, b), gas through fitting 3, entering high-pressure chamber b and acting on valve 7, tends to open it (and in reverse-acting gearboxes, close it). The reducing valve 7 is pressed against the seat by the shut-off spring 5 and blocks the access of high pressure gas. Membrane 1 tends to move the reducing valve 7 away from the seat and open the access of high-pressure gas to the low (working) pressure chamber 10. In turn, membrane 1 is under the influence of two mutually opposite forces. From the outside, a pressure spring 11 acts on the membrane 1 through a pressure screw 12, which tends to open the reducing valve 7, and from the inside of the reducer chamber, a reduced low-pressure gas, counteracting the pressure spring 11, presses on the membrane. When the pressure in the working chamber decreases, the pressure spring 11 straightens, and the valve moves away from the seat, while the gas flow into the reducer increases. As the pressure in the working chamber 10 increases, the pressure spring 11 is compressed, the valve moves closer to the seat and the flow of gas into the reducer decreases. The working pressure is determined by the tension of the pressure spring 11, which is changed by the adjusting screw 12. When the adjusting screw 12 is unscrewed and the pressure spring 11 is loosened, the working pressure decreases and, conversely, when the adjusting screw is screwed in, the pressure spring 11 is compressed and the operating gas pressure increases. To control the pressure, a pressure gauge 4 is installed on the high-pressure chamber, and a pressure gauge 9 is installed on the working chamber. safety valve 8.
In practice, the most widely used reverse action gearboxes To more convenient and safe to use .
Types of gas reducers
Air reducer, or regulator - used on industrial enterprises to reduce air pressure and maintain it constant in air networks and communications, as well as in scuba diving to reduce the pressure of the breathing mixture
Oxygen reducer - used in various enterprises (especially many in mechanical engineering and metallurgy) for autogenous work (gas welding, cutting and soldering), as well as in medicine and scuba diving.
Propane reducer - used in various types of enterprises (especially many in mechanical engineering and metallurgy) for carrying out autogenous work (cutting, soldering and heating) during construction (for laying bitumen coatings) or in everyday life (gas stoves). They come with a constantly set operating pressure (set at the manufacturer) and with the ability to adjust the pressure in the range of 0-3 kgf/cm2.
Acetylene reducer - used in various types of enterprises (especially many in public utilities) for gas welding and cutting of pipelines. In general, gas reducers are divided into reducers for flammable and non-flammable gases.

Reducers for flammable gases(methane, hydrogen, etc.) have a left-hand thread to prevent accidental connection of a reducer operating with flammable gases to an oxygen cylinder. Cylinders with inert gases (helium, nitrogen, argon, etc.) have a right-hand thread, like oxygen cylinders. Thus, oxygen reducers can be used for inert gases.
In addition, the reducer can act as a pressure relief valve. IN English language Reducers of this type are called back pressure regulators, in contrast to conventional pressure regulators. The use of reducers and pressure relief valves can be combined, in this case the reducer is installed at the inlet of the system and regulates the flow of gas, while the valve is installed at the outlet and, if necessary, provides relief of excess pressure, which increases the overall stability of the system.

Based on materials from Wikipedia..