RU2721146C1 - Gas pressure regulator - Google Patents

Abstract

FIELD: gas pressure regulators.

SUBSTANCE: gas pressure regulator comprises gas inlet and outlet channels, housing accommodating control piston and piston displacement control chamber communicating with command pressure system. Gas pressure regulator further comprises a pilot pressure regulator with a reduction chamber interconnected at the inlet to the piston control chamber and the gas inlet channel and to the outlet pipeline at the outlet. Adjusting piston is located coaxially to flow of the reducible medium with possibility of movement at pressure change in the piston control chamber under action of the pilot regulator.

EFFECT: technical result consists in obtaining easy-to-operate and reliable design of gas pressure regulator, providing high accuracy of control in a wide range of pressures.

5 cl, 1 dwg

Description

The invention relates to devices for automatic control of gas pressure and, can be used in gas supply systems of industrial and agricultural facilities, as well as in public utilities, requiring automatic maintenance of the gas outlet pressure at a given level.

The regulator according to the claimed invention is designed to reduce and automatically maintain the gas pressure at the outlet of the regulator, regardless of the selection of gas by the consumer and gas pressure fluctuations at the inlet of the regulator.

Known pressure regulator of indirect action (RF patent No. 2375737, publ. 10.12.2009) containing the outer and inner cylindrical bodies, gas inlet and outlet cavities located coaxially relative to each other, a sensing element made in the form of a piston, a cavity of command and output pressure, regulatory body and stock. At the same time, the regulatory body is made in the form of two split compression and extension springs with valves rigidly connected to each other by a rod, and the cavities of the command and output pressure of the sensing element are provided with tubes for supplying gas.

Known gas pressure regulator (RF patent No. 168803, publ. 06/21/2016) containing an amplifier, housing, cover, seat and piston valve. The spring cavity of the piston valve is in communication with the area behind the pressure regulator and is a feedback cavity. The opposite cavity of the piston valve is a command. The command to this cavity is given from the amplifier, which serves to turn the regulator into operation, set and maintain its operation modes. The amplifier membrane moves a double valve, in which the command pressure is formed, which is determined by the tightening of the tuning spring and the level of the outlet pressure behind the regulator. Given the diameter of the amplifier membrane given by the amplifier construct, the equilibrium of the membrane is determined by the force from the pressure at the outlet of the regulator (feedback) and the force of the tuning spring. The higher the set pressure level at the outlet of the regulator, the higher the force from this pressure on the membrane and the higher the force of the adjustment spring should be. To compensate for this force, the spring cavity of the membrane is provided with an additional spring. The choice of the force of the additional spring depends on the level of the outlet pressure behind the regulator and, accordingly, the level of effort on the membrane from this pressure.

A known actuator pressure regulator (RF patent No. 2601980, publ. 10.11.2016), containing a housing with a seat, an elastic shutter, input, output and control chambers, as well as a channel for connecting the control chamber to the control device, pneumatically controlled locking device, characterized the fact that the pneumatically controlled locking device is located in an additional chamber made in the saddle of the housing from the side of the output chamber, the output chamber is equipped with a reciprocal seat, and in the housing there is a channel for connecting the pneumatic managed locking device to the control device.

Known gas pressure regulator (RF patent No. 2361261, publ. 27.02.2009), containing gas inlet and outlet channels, a housing with a back cover, inside of which a piston valve communicating gas inlet and outlet channels is fixed on a rod mounted with axial movement , and a control piston, separated between each other with the formation of a discharge cavity and a control pressure cavity, respectively, and an outlet pressure cavity is formed between the control piston and the back cover of the housing, the discharge cavity is in communication with the inlet channel gas, and the outlet pressure cavity is in communication with the gas outlet channel, characterized in that the control pressure cavity is in communication with the command pressure system by means of a damping system, which includes a separation tank with gas and hydraulic cavities and a nozzle, the gas cavity is in communication with the gas command pressure system, and hydraulic through the nozzle - with a control pressure cavity. (adopted as a prototype)

Among the available designs of regulators, the following disadvantages are identified;

- design complexity;

- not full bore pressure regulator;

- the presence of elastic valves made of polymeric materials undergoing constant deformation;

- large dimensions.

The task to which the claimed technical solution is directed is to create a simple and reliable design of a gas pressure regulator.

The technical result consists in obtaining an easy-to-use and reliable design of a gas pressure regulator, providing high accuracy control in a wide pressure range.

The technical result is achieved in that the gas pressure regulator contains gas inlet and outlet channels, a housing inside which there is a control piston and one piston displacement control chamber communicating with the command pressure system, a pilot pressure regulator with a reduction chamber communicating with the piston control chamber and the channel gas inlet.

The technical solution is illustrated in figure 1, which presents a General view of the gas pressure regulator with an actuator.

The gas pressure regulator consists of a gas valve 1 piston type and a pilot gas pressure regulator 2.

The gas piston valve 1 comprises a housing 3 with end channels of the inlet 4 and the outlet 5 of the gas. In the lower part of the housing is provided with an opening 6 for condensate drainage. In the valve body 1, a piston 7 is placed with the possibility of movement in the axial direction, pressed by a spring 8 to the sealing element 9, fixed by a bolt 10 on the inlet flange 11, and having radially spaced openings 12 with an area providing full bore of the valve 1, the piston control chamber 13 in communication with the channel gas outlet 5. Spring 8, relying on the output flange 14, compresses the piston 7. The degree of compression of the spring 8 is regulated by the pilot regulator 2.

In the upper part, the valve 1 is connected through technological channels 15 and 16 to the input 19 of the pilot controller 2, while the control chamber of the piston 13 communicates with the technological channel 16, and the gas inlet channel 4 communicates with the technological channel 15, on which the throttle 18 is installed in the form of a needle valve.

The pilot gas pressure regulator 2 includes a housing 17 with a pulse gas inlet channel 19 and a pulse gas outlet channel 20. A piston 21 is made in the housing, which is capable of axial movement and opens the pulse gas current from the channel 19 to the reduction chamber 22, which is separated from the tuning chamber 23 the membrane 24. The opening of the gas flow through the seat 25 is provided by the action of the master spring 26 on the piston 21, squeezing it from the saddle 25. The degree of preload of the master spring is determined by the adjusting bolt 27.

Device Description

In the initial state, gas enters the piston gas valve 1 through the inlet channel 4, the pilot gas pressure regulator 2 is normally closed, because the pilot spring 22 of the pilot controller 2 is not compressed. There is no gas flow through the pilot regulator 2, the inlet pressure entering through the channels 15 and 16 enters the control chamber of the piston 13, pressing the piston 7, valve 1 is normally closed.

Part of the flow from the inlet 4 of the piston valve enters through the technological channel 15 and the inlet of the pilot controller 19 under the seat 25 of the pilot controller 2.

Setting (setting) the nominal value of the output pressure, relative to which the regulation is carried out, is implemented by the compression ratio of the driving spring 26 of the pilot regulator 2. Depending on the tightening of the driving spring 26, set by the adjusting bolt 27 in the tuning chamber 23, the clearance between the piston 21 and the seat 25 changes, through which passes the gas and thereby regulates the flow of gas through it, which in turn leads to a change in the control pressure in the control chamber of the piston 9.

When tightening the master spring 26 by means of the adjusting bolt 27, the piston 21 moves away from the seat 25 and begins the flow of gas.

In the process, the pilot regulator 2 dumps part of the incoming gas into the outlet pipe through the seat 25 and the outlet channel 20. In this case, the gas supply to the pilot regulator is limited by the valve (throttle) 18.

When reducing the flow area of the throttle (needle valve 18) due to the restriction of gas supply, a difference is created between the inlet pressure at the inlet 4 and the pressure in the piston control chamber 9, the piston 7 is moved and the gas flows into the piston space from channel 4 to the output through channel 5 The degree of movement of the adjusting piston 7 and, accordingly, the opening of the valve depends on the pressure in the control chamber of the piston 9, which is accordingly regulated by the pilot regulator 2 and automatically changes depending dependencies on gas pressure in chamber 22.

Valve 1 remains open until the pressure supplied by the pulse line to the reduction chamber 22 violates the balance of the opposing forces: the gas pressure on the membrane 24 and the force created by the set spring 26. When the pressure in the system after the gas piston valve 1 approaches the preset value on the pilot regulator 2, the latter stops discharging gas, and the valve section 18– pilot regulator 2 is filled with gas to the inlet pressure, the pressure in the control chamber 9 is aligned with the inlet and shifts the pore Shade 7, pressing it against the sealing element 9 of the input flange 11, ensuring the tightness of the valve 1 (the surface area of the piston by more than the control chamber from the inlet pressure and the balance of forces is shifted in a control chamber).

The advantages of the claimed invention:

- simplicity of design and maintenance;

- maintainability;

- made of stainless steel, the claimed regulators have a long service life;

- the ability to work at a pressure of up to 10 MPa, while having a small size;

- the ability to create a differential from the highest working 10 MPa to the lowest output 0.1 MPa for one stage of reduction.

Due to the simplicity of the design and the complete maintainability of each element of the design of the regulator, its reliability and ease of operation are achieved. The lack of elastic elements of a large area can reduce overall dimensions and increase the range of inlet pressures due to the lack of low-strength materials. Adjustable choke provides high sensitivity controller. The performance in materials resistant to low temperatures allows the regulator to be used in one-stage reduction from the maximum inlet to the minimum outlet pressure.

Claims (5)

1. Gas pressure regulator containing gas inlet and outlet channels, a housing inside which there is a control piston and one piston movement control chamber communicating with the command pressure system, characterized in that it contains a pilot pressure regulator with a reduction chamber communicating at the inlet with the chamber control of the piston and the gas inlet channel and with the output pipe at the output, the control piston is located coaxially with the flow of the reduced medium with the ability to move when the pressure in the control chamber changes Ia piston under the action of a pilot regulator. 2. The gas pressure regulator according to claim 1, characterized in that the pilot pressure regulator comprises a housing, pulse gas inlet and outlet channels, a tuning chamber for setting the nominal value of the output pressure, a reduction chamber and a piston, which is pressed by the set spring to the piston seat and moves between the adjustment camera and the reduction camera separated from it. 3. The gas pressure regulator according to claim 1, characterized in that a needle valve is placed on the line connecting the gas inlet channel to the reduction chamber of the pilot regulator. 4. The gas pressure regulator according to claim 1, characterized in that the regulating piston is pressed against the seat by the input pressure. 5. The gas pressure regulator according to claim 1, characterized in that the piston of the tuning chamber has the possibility of axial movement.

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