RU213846U1 - Axial flow check valve - Google Patents

Abstract

The utility model relates to pipeline fittings and is intended for guaranteed blocking of the reverse flow of liquid and gaseous media used in gas, oil, chemical and other industries. The axial flow return valve comprises a housing (1) with an inlet (2) and an outlet (3) branch pipes, a seat assembly (4) installed in the branch pipe (2), a spring-loaded locking element in the form of a clamping disk (6) with a stem fixed in it (7) installed in bearings (9) placed in the through hole of the fairing (11) located inside the housing (1) and made in one piece with it. Between the fairing (11) and the body (1) there is an annular space separated by bridges and forming a flow cavity (12), blocked by a shut-off body (6). The hole for the rod (7) is connected to the damping chamber (13) formed by the fairing (11) and the partition (14) of the fairing (11), in which throttle holes (15) are made connecting the damping chamber (13) to the working chamber (16) and flow cavity (12) of the housing (1). The seat (4) consists of a bushing (17) and a ring (18) in contact with it. In the recess of the ring (18) there is an elastic sealing element (19), pressed on the other side by the sleeve (17) by means of fasteners evenly spaced around the circumference of the seat (4). EFFECT: increased reliability of the valve by preventing the destruction of the sealing element from high specific loads and the degree of sealing in the closed position. 2 ill.

Description

The utility model relates to pipeline fittings, in particular to shut-off and protective pipeline fittings, and is intended for guaranteed blocking of the reverse flow of liquid and gaseous media used in gas, oil, chemical and other industries.

Currently, one of the urgent tasks is to create a reliable design of a check valve designed for free passage with a minimum hydraulic resistance to the flow of the working medium in only one direction. At the same time, the need to ensure high reliability of the valve when used in a high-pressure system, a high degree of tightness in the closed position, as well as response speed is brought to the fore.

Known check valve with axial direction of flow, containing a body with inlet and outlet channels, in the inner cavity of which there is a seat and a spring-loaded shut-off body with a stem in contact with the seat, the thrust ring is installed in the annular groove formed by the contact surfaces of the seat and a groove on the inner surface of the outer body , the contact surfaces of the thrust ring and the outer part of the seat are tapered (Patent RU No. 2417335 C2, IPC F16K 15/06, priority dated 11/07/2006, publ. 04/27/2011).

A disadvantage of the known valve is the low reliability of the valve due to the loss of tightness of the fit of the shut-off body to the seat during operation and the impossibility of using it in extreme operating conditions. This is due to the fact that the constant impact of high specific loads on a thin-walled conical insert leads to wear and destruction of the seat.

The closest in purpose, technical essence and the result achieved to the one claimed as a utility model is a check valve, containing a body with inlet and outlet pipes, a seat installed in the pipe, a spring-loaded shut-off body in the form of a movable disk with a stem fixed in it, installed in bearings placed in the through hole of the fairing, located inside the housing and made in one piece with it, between the fairing and the housing there is an annular space separated by jumpers and forming a flow cavity for the flow of the working medium, blocked by a shut-off body, the hole for the rod is connected to the damping chamber ( chamber of constant volume) formed by a fairing and a baffle, throttle holes are made in the baffle connecting the damping chamber with the working chamber and the flow cavity of the body (Patent RU No. 2243439 C2, IPC F16K 15/06, dated 10.02.2003, pub. .).

A disadvantage of the known valve is the low reliability of its valve due to the loss of tightness of the fit of the shut-off body to the seat during operation and the impossibility of using it in extreme operating conditions. This is due to the fact that the constant impact of high specific loads on a thin-walled conical insert leads to wear and destruction of the seat.

The technical problem to be solved by the utility model is to increase the reliability of the valve by preventing the destruction of the sealing element from high specific loads and increasing the degree of sealing in the closed position.

To achieve the specified technical result in a reverse axial flow valve, containing a body with inlet and outlet pipes, a seat assembly installed in the pipe, a spring-loaded shut-off device in the form of a clamping disk with a stem fixed in it, installed in bearings placed in the through hole of the fairing, located inside the body and made in one piece with it, between the fairing and the body there is an annular space, divided by jumpers and forming a flow cavity for the flow of the working medium, blocked by a shut-off body, the hole for the rod is connected to a damping chamber formed by the fairing and a partition, in which throttle openings connecting the damping chamber with the working chamber and the flow cavity of the body, according to the utility model, the seat consists of a bushing and a ring in contact with it, in the recess of which an elastic sealing element is located, pressed on the other side by the bushing by means of fasteners tov, evenly spaced around the circumference of the saddle.

The seat is made of a bushing and a ring in contact with it, and the arrangement of an elastic sealing element in the recess of the ring, pressed on the other side by the bushing by means of fasteners uniformly spaced around the circumference of the seat, makes it possible to prevent the destruction of the elastic sealing element from high specific loads, and thereby increase reliability valve and the degree of sealing in the closed position.

Axial flow check valve is illustrated by drawings, where:

in fig. 1 - shows a general view of the reverse axial flow valve, in section;

in fig. 2 - view A in Fig. 1 shows a seat assembly consisting of a conical bush with an elastic sealing element inserted into it and a bush.

In the drawings, positions are indicated:

1 - body

2 - inlet pipe

3 - outlet pipe

4 - seat assembly

5 - clamping sleeve

6 - locking body in the form of a clamping disk

7 - stock

8 - spring

9 - bearings

10 - through hole

11 - fairing

12 - flow cavity

13 - damping chamber

14 - fairing partition

15 - throttle holes

16 - working chamber

17 - sleeve

18 - ring

19 - elastic sealing element made of elastic material (polyurethane)

20 - screw

21 - cuff

22 - end surface of the elastic sealing element.

The axial flow return valve comprises a body 1 with inlet 2 and outlet 3 branch pipes, seat assembly 4, installed on the side of inlet pipe 2, is pressed by pressure sleeve 5. Seat assembly 4 interacts with shut-off body 6. Shut-off body 6 is made in the form of a movable disk with a guide rod 7 fixed in it, preloaded by a spring 8 (Fig. 1). The conical surface of the seat assembly 4, which interacts with the locking element 6, has a wear-resistant surfacing. The rod 7 of the locking element 6 is mounted in bearings 9 placed in the through hole 10 of the fairing 11. The fairing 11 is located inside the housing 1 and is made in one piece with it. Between the fairing 11 and the housing 1 there is an annular space separated by bridges and forming a flow cavity 12 for the flow of the working medium, blocked by a shut-off body 6. The hole 10 for the rod 7 is connected to the damping chamber (constant volume chamber) 13 formed by the fairing 11 and the partition 14. Throttle holes 15 are made in the partition 14, connecting the damping chamber 13 with the working chamber 16 and the flow cavity 12 of the housing 1.

The seat assembly 4 consists of a sleeve 17 and a ring 18. In the recess of the ring 18 there is an elastic sealing element 19, pressed on the other side by the sleeve 17 with the help of fasteners - screws 20, evenly spaced around the circumference of the seat 4. Between the body 1 and the seat 4 is located cuff 21 (Fig. 2) for a snug fit of the locking body 6 to the seat 4 during operation. Due to the selected dimensions of the place for the elastic sealing element 19 in the seat 4, as well as the selected dimensions and shape of the elastic sealing element 19 itself, the end surface 22 of the elastic sealing element 19 is pressed by the parts of the seat 4.

The axial flow check valve works as follows:

In the initial (closed) position, in the absence of pressure in the system, the locking element 6 under the action of the spring 8 is pressed against the surface of the sleeve 17 of the seat 4, ensuring separation of the inlet and outlet. The pressure in the inlet 2, outlet 3 nozzles and the flow cavity 12 is the same. When the pressure in the inlet pipe 2 increases in comparison with the pressure in the outlet pipe 3, the locking element 6 from the "closed" position under the action of the pressure of the working medium, overcoming the force of the spring 8, moves away from the sleeve 17 to the right and opens the valve. The working medium from the inlet pipe 2 through the flow cavity 12 enters the outlet pipe 3 of the valve.

In this case, the rod 7 from the hole 10 of the fairing 11 extends into the damping chamber 13, as a result of which the volume of this chamber decreases, which leads to compression of the working medium in it, partially penetrating into the damping chamber 13 through the gaps between the rod 7 located in the hole 10 of the fairing 11 , as well as through the throttle holes 15. The compressed working medium in the working chamber 16 tries to push the stem 7 back into the hole 10, and the spring 8 - to take its original position, while the damping of the shut-off body 6 occurs when the valve is opened.

With a decrease in the pressure drop in the inlet pipe 2, the flow of the working medium through the valve decreases and, accordingly, the speed of the direct flow of the medium decreases. The pressure in the damping chamber 13 increases and equalizes with the pressure in the outlet cavity 3.

The resulting opening force of the locking element 6 decreases, and under the action of the spring 8 it returns to its original position, is pressed against the seat 4 and closes the flow cavity 12. In this case, the sleeve 17 is deformed, providing the necessary tightness, and acts on the elastic sealing element axial force from the locking body 6, preventing the destruction of the sleeve 17. The elastic sealing element 19 under the pressure of the sleeve 17 and the locking body 6, moves along the surface of the sleeve 17, reducing its size, and compresses the end surface 22 of the elastic sealing element 19. End surface 22 of the elastic sealing element 19, trying to take its original position, moves up the surface of the sleeve 17. At the same time, the working medium from the flow cavity 12, under the pressure of the reverse flow of the working fluid, acts on the end surface 22 of the elastic sealing element 19 on the other side. Ring 18 moves down in the opposite direction, presses on the elastic sealing element 19 and moves it in the opposite direction, i.e. towards the locking body 6, providing additional compression of the sleeve 17 and the elastic sealing element 19 to the locking body 6. At the same time, when the locking body 6 is moved, the stem 7 extends from the damping chamber 13. The volume of the damping chamber 13 increases sharply and the pressure in it, compared to the pressure in the working chamber 16, decreases (due to the small size of the throttle holes 15, it does not have time to equalize), and the movement of the shut-off body 6 is more dependent on the spring 8. With the rapid movement of the shut-off body 6, the pressure in the damping chamber 13 becomes much less than in the working chamber 16, and there is a decompression of the medium, which reduces the force of impact of the shut-off body 6 on the seat 4.

Thus, the valve retains its performance under extreme operating conditions for a long time, ensuring reliable sealing of the valve by preventing the destruction of the sealing element of the seat under the action of high specific loads and reducing dynamic loads when seated on the seat of the shutoff body retains the design (full) throughput in throughout the entire period of validity. The effect of using the proposed valve is to reduce the cost of its manufacture due to reliable operation and increase the service life of the valve several times. The manufacture of such valves is possible using existing means of production using known technological operations.

Claims (1)

Axial flow return valve, comprising a body with inlet and outlet pipes, a seat assembly installed in the pipe, a spring-loaded shut-off device in the form of a clamping disk with a stem fixed in it, installed in bearings, placed in a through hole of the fairing located inside the body and made behind one piece with it, between the fairing and the body there is an annular space divided by jumpers and forming a flow cavity for the flow of the working medium, blocked by a shut-off body, the hole for the rod is connected to the damping chamber formed by the fairing and the partition, in which the throttle holes are made connecting the damping chamber with a working chamber and a flow cavity of the body, characterized in that the seat consists of a bushing and a ring in contact with it, in the recess of which an elastic sealing element is located, pressed from the other side by the bushing by means of fasteners evenly spaced around the circumference of the seat.

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