RU187492U1 - Pressure control valve - Google Patents

Abstract

The utility model relates to the gas industry and is intended to control the flow of a working medium in high-pressure pipelines for use on hydropneumatic actuators of main piping actuators. The utility model allows maintaining the input working pressure necessary for the normal operation of the actuators of the main pipelines without the participation of personnel by: - automatically switching the pressure source from the priority line to the backup line, when the supply pressure in the priority line from the pulsed gas system falls below the required (adjustable) threshold value; - automatic switching of the pressure source from the backup line to the priority line, at increasing the supply pressure in the priority supply line from the pulsed gas system is higher than the necessary (adjustable) threshold value. 3 ill.

Description

The utility model relates to the gas industry.

STO Gazprom 2-3.5-454-2010, “Rules for Maintaining Gas Pipelines,” requires equipping a pulse gas backup system with shutoff valves for linear parts of main gas pipelines, as well as at compressor station connection points (Section 5.7.14).

The utility model is intended for operation in a system of redundancy of pulsed (control) gas of actuating mechanisms of pipeline valves (TPA).

The utility model makes it possible to maintain the pressure of a pulsed gas at the inlet to the actuator necessary for the normal functioning of TPA actuators without the presence of a person, by:

- automatic switching of the pulsed gas supply from the priority line to the backup line when the supply pressure of the priority pulsed gas supply drops below the required (adjustable) threshold value;

- automatic switching of the pulsed gas supply from the backup line to the priority line when the supply pressure of the priority pulsed gas supply increases above the necessary (adjustable) threshold value.

There are many devices actuating mechanisms TPA. This is mainly shutoff valves (http://ru.wikipedia.org). The valves include valves, valves, gates, valves. Shutoff valves are devices for opening and closing the flow of liquids or gases in pipelines, gas pipelines, reservoir pipes, drain and other distribution devices. Depending on the design of the locking element and the purpose, the valves are divided into a huge number of types of valves, taps, valves, valves. The disadvantage of all known analogues that are currently used is that they are not designed to automatically, if necessary, switch the supply of pulsed gas from the priority line to the backup and vice versa from backup to priority, therefore, personnel are required for such a switch. This problem is exacerbated by the large distances between the switches and the large number of switches in the piping of the compressor station and the nodes connecting the compressor to the main pipeline.

In pipelines of high-pressure systems, valves are usually used for switching valves, which are subdivided into spool and valve types according to the design of the shut-off element. Valve distributors are more reliable in operation than spool valves and are most effectively used in hydraulic locks, in quick-disconnect connections of pipelines and hoses. They have high tightness, which is mainly ensured by the design of the locking element, which structurally can be made in the form of a ball, cone or cylindrical sleeve. The main disadvantage of these valves when working in conditions of high pressure and flow rate of the working medium is the application of great efforts to the shut-off element during switching (K.M. Kholin, O.F. Nikitin. Fundamentals of hydraulics and volumetric hydraulic drives. M: Engineering, 1989 , p. 99-104). In addition, valve manifolds at the same liquid flow rates are more bulky and significantly more massive than spool valves. The valves have a sharp fit on the seat, and this property can lead to hydraulic shock in hydraulic systems, and in pneumatic systems lead to rapid wear of the valve seat.

As a prototype, RF patent 2217637 was selected for a control valve comprising a housing with inlet and outlet openings, valve seats, a locking element made in the form of a hollow cylindrical sleeve and connected to the actuator, and that the locking element is provided with protrusions made on its outer surface in the plane cross-section and in contact with the inner surface of the housing, and the end surfaces of the locking element and valve seats are made in the form of inverse truncated cones, in addition, these protrusions are located about the ends of the locking element, and can be equipped with supporting sleeves located inside the hollow cylindrical sleeve on both sides, provided with seals on their outer sides, while the supporting sleeves are rigidly fixed relative to the housing.

The disadvantage of the prototype is the inability to switch from the priority highway to the backup highway when the required (custom) threshold value is reached

The technical result is achieved due to the implementation of the pressure maintenance valve combined, with a locking element of the valve type for opening and closing of the priority input and a locking element of the backup input of the spool type.

The invention is illustrated by drawings, which depict:

in FIG. 1 - A longitudinal section of the General view of the valve when working with priority input;

in FIG. 2 - The position of the elements at a pressure of the medium priority flow more than 2.5 MPa;

in FIG. 3 - The position of the elements when the pressure of the medium priority flow is less than 2.5 MPa;

1 shows a valve arrangement. The numbers show:

- main body 1

- Intermediate housing 2

- housing cover 3

- Coupling bolt 4

- O-rings 5

- Seal of the piston rod 6

- piston rod 7

- Movable shutter 8 with seal

- Shutter seat 9

- Gas outlet fitting 10

- Gas priority inlet fitting 11

- Axial shutter 12

- Circlips 13

- Saddle Seat 14

- Gas backup inlet fitting 15

- Spring block housing 16

- Pre-regulation cover 17

- Lock nut pre-regulation 18

- Cylindrical mechanical emphasis 19

- Coupling bolt 20

- External spring 21

- Separation glass 22

- Inner spring 23

- Glass persistent 24

- Pin stop 25

- Adjusting screw 26

- Locknut for adjusting screw 27

- Shutter spring 28

- Thrust washer 29

- Piston rod stroke adjustment bolt 30

- Adjustment rings 31

- Protective cap 32

The device consists of a main body 1, assembled in a single unit with an intermediate body 2 and a body cover 3, using six coupling bolts. O-rings are installed between the housings and the cover 5. In the center of the cover 3 there is an opening with seals 6 for passage of the piston rod 7. In the main body, a cavity “B” is made along the axis of symmetry to accommodate the valve-type movable shutter with seal 8 and a press fitting seat valve seats 9. The cavity "B" in which the valve seat is located is connected to a radial hole with a thread for the gas outlet fitting 10 from the valve. On the other hand, a threaded hole is located in front of the valve seat 9, forming a cavity “B” with a fitting for the priority gas inlet 11. In the intermediate housing 2, a cavity “G” is made along the axis of symmetry, in which there is an axial valve 12 of the spool type fixed to the stem - a piston 7 with two retaining rings 13 installed between the ends of the axial shutter 12. On two sides of the cavity "G" along the axis of symmetry there are grooves in which the seats 14 of the axial shutter 12 are installed. Between the saddles, radially threaded, under the backup gas inlet fitting 15. The cylindrical case of the spring block 16 is pressed into, or screwed on with pins on the other side of which the thread is cut, under the pre-regulation cover 17, with the lock-up pre-regulation lock nut 18. Inside the cylindrical case of the spring block 16, a cylindrical mechanical stop 19 is installed, which, with the help of a coupling bolt 20, is rigidly attached to the piston rod 7. The cylindrical mechanical stop 19 has an annular groove for installation an external spring 21 and a cylindrical surface on which the separator cup 22 slides, which has an outer groove for installing the external spring 21 and an inner groove for installing the inner spring 23. The inner spring 23 is located inside the separator cup 22 and rests on one side of the groove inside its end, the other side rests on the groove in the cup stop 24. The cup stop 24 is made as a lid with a groove (under the inner spring 23) with a hole in which the pin stop 25 is installed, which abuts against the torus The screw of adjusting screw 26. The adjusting screw is screwed into the pre-adjustment cover 17 and locked with the lock nut of the adjusting screw 27. A movable shutter with a seal 8 is able to move along the outer surface of the piston rod 7, and with the help of the shutter spring 28 can be pressed against the shutter seat 9. A thrust washer 29 is attached to the part of the piston rod 7, which extends out through the housing cover 3, with a stroke adjustment bolt 30 of the piston rod 7 with a locked elastic washer. The stroke of the piston rod 7 is controlled by adjusting rings 31. A protective cap 32 is located on the pre-regulation cover 17 to protect the threads from atmospheric precipitation and unauthorized access to the adjusting screw 26. The power from the priority input is determined by the fact that it is dried and cleaned as a working medium gas from the starting, fuel and pulsed gas preparation unit. In the backup line, gas is used from the pipeline through which commercial gas is pumped that has not undergone additional purification. In the case of modernization of the compressor station, compressed nitrogen from the compressor air separation unit can be supplied to the priority inlet main, so a pressure drop in the priority inlet main can be up to 2.5 MPa.

The inventive device operates as follows: If there is a medium pressure of the priority stream at the inlet within, for example, from 2.5 to 7.5 MPa (Fig. 2.) and the backup inlet pressure in the range from 5.2 to 7.5 MPa, the movable shutter 8 is shifted (from the pressure of the pulsed gas in the cavity “B” of the priority input) to the leftmost position, compressing the gate spring 28. As a result, the cavities “B” and “C” communicate. Under the influence of the pressure difference, the piston rod 7 moves to the right, compressing the outer 21 and inner 23 of the spring. In this case, the thrust washer 29 mounted on the piston rod 7 abuts against the cover 3, which limits the axial movement of the slide valve 12 of the slide valve type. The slide valve 12 of the spool type overlaps the communication of the two cavities “B” and “G”. Gas is supplied to the consumer from the priority entrance (cavity “B”)

When the pressure of the medium priority flow in the chamber "B" is less than 2.6 MPa, (Fig. 3.), the springs 21 and 23 move the piston rod 7 to the leftmost position. In this case, the cylindrical mechanical stop 19 abuts against the housing, restricting the axial movement of the movable shutter 12, at which the cavities “G” and “B” communicate. Under the action of pressure in the cavity "C" and the gate spring 28, the movable valve 8 of the valve type moves to the extreme right position, blocking the message of the two cavities "B" and "B". Gas is supplied to the consumer from the backup entrance (cavity "G")

The technical result is the automatic switching of the supply lines when the pressure in the priority input line changes. The design of the shut-off unit is triggered from the pressure drop between atmospheric and pressure in the priority input line to the achievement of the necessary (adjustable) threshold value and changes the power supply of the actuator from the priority to the backup source (and vice versa) automatically, without the participation of maintenance personnel.

Claims (1)

Distributor valve, consisting of the main body 1, assembled in a single unit with the intermediate body 2 and the body cover 3, connected by six coupling bolts 4 and sealed at the joints by means of o-rings 5, characterized in that the valve body is a single the block of the main 1 and intermediate 2 cases connected by clamping bolts 4 together with a cover 3 having a groove with a sealing ring 6, forming a movable connection with the piston rod 7, and in the main body along the axis of symmetry there is no cavity “B” with the placement of a movable shutter 8 of the valve type with a seal and a seat for the valve seat 9, cavity “B” is connected to a radial hole having a thread for the gas outlet 10, and a cavity is made to the right of the valve seat 9 ” B "with a radial hole having a thread for the priority gas inlet fitting 11, a cavity" G "is made in the intermediate case 2 along the axis of symmetry with an axial-type slide valve 12 located therein, fixed at both ends on the piston rod 7 by two flanges 13, on both sides of the cavity "G" grooves are symmetrically made with the seats of the axial shutter 14 installed, between which there is a radial hole with a thread for the backup gas inlet fitting 15, the cylindrical case of the spring block 16 is pressed into place and fixed with pins, which sets the pre-regulation cover 17, with the pre-regulation lock nut 18, inside the cylindrical case of the spring block 16, a cylindrical mechanical stop 19 is installed, which The coupling bolt 20 is rigidly attached to the piston rod 7, and the mechanical stop 19 has an annular groove for installing the external spring 21 and a cylindrical surface along which the separation cup 22 moves, which has an external groove for installing the external spring 21 and an internal groove for installing the internal springs 23, the inner spring 23 is installed inside the separation cup 22 and rests on one side of its end face, and the other side rests on the groove in the persistent cup 24, the cup itself is persistent 24 It is not like a cover with a groove under the internal spring 23, and has a hole in which a pin stop 25 is installed, which abuts against the end of the adjusting screw 26, and the adjusting screw is screwed into the pre-adjustment cover 17 and secured against turning the adjusting screw 27 with the locknut, and the pre-regulation cover 17 is equipped with a protective cap 32 to protect the thread from atmospheric precipitation and unauthorized access to the adjusting screw 26, a movable shutter with a seal 8 has the possibility of movement along the outer surface of the piston rod 7, and with the help of the shutter spring 28 can be pressed against the valve seat 9, the part of the piston rod 7, which is located outside the housing cover 3, is equipped with a thrust washer 29, held by the stroke adjustment screw 30 of the piston rod 30 7, and the stroke can be adjusted by adjusting rings 31 installed between the piston rod 7 and the thrust washer 29.

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