CN211449779U - A trip valve for low temperature pipeline - Google Patents

Abstract

The utility model discloses a shut-off valve for low-temperature pipelines, comprising: a valve body, wherein the valve body is provided with a mounting seat which separates the first accommodating cavity into a first cavity and a second cavity; A first installation hole is provided, and an assembly hole is arranged on the peripheral surface of the valve body; the valve core, one end of the valve core is provided with an extension part, the extension part is matched with the first installation hole on the installation seat, and the extension part is provided with a first installation hole on the extension part. A first pressure relief channel communicated with the two accommodating cavities, the valve core is provided with a first sealing component surrounding the extension portion and used to seal the first installation hole, and a peripheral surface of the valve core is provided with the first sealing component a second pressure relief channel communicated with the cavity; a driving mechanism for driving the valve core to open or close the first installation hole; an elastic sealing assembly located in the second accommodating cavity, one end of the elastic sealing assembly is connected with the valve core, The other end of the elastic sealing component is matched with the first pressure relief channel. The utility model has the advantage of reverse pressure relief in the off state.

Description

A shut-off valve for cryogenic pipelines

technical field

The utility model relates to a shut-off valve used for low-temperature pipelines.

Background technique

The shut-off valve can be quickly opened or closed, and is widely used in the circulation pipelines of LNG, liquid ethylene, and other low-temperature media.

At present, the shut-off valve used in the cryogenic pipeline is a commonly used emergency shut-off valve. After the gas filling machine is completed, the outlet pneumatic shut-off valve is closed, and the rear hose of the pneumatic valve and the liquid filling gun form a closed space. The temperature of the medium is -162°C. After the outlet pneumatic shut-off valve is closed, the LNG is vaporized, and the pressure at the back end of the shut-off valve rises. If the pressure is not released, the dosing gun and the dosing hose will be damaged, resulting in LNG leakage, posing a safety hazard. At this time, it is often necessary to add many other pressure relief devices to the back-end pipeline to realize the pressure relief of the closed pipeline at the back end of the valve, which leads to a complicated pipeline structure and an increased pipeline cost.

Utility model content

The utility model provides a shut-off valve for low-temperature pipelines capable of reverse pressure relief.

The technical solutions to achieve the above purpose are as follows:

A shut-off valve for cryogenic pipelines, comprising:

A valve body with a first accommodating cavity, the valve body is provided with a mounting seat that divides the first accommodating cavity into a first cavity and a second cavity, the mounting seat is provided with a first mounting hole, and the peripheral surface of the valve body An assembly hole is provided on the upper part, one end of the valve body is provided with a first opening, and the other end of the valve body is provided with a second opening;

A valve core with a second accommodating cavity, one end of the valve core is provided with an extension part, the extension part is matched with the first installation hole on the mounting seat, and the extension part is provided with a first pressure relief channel communicating with the second accommodating cavity, the valve The core is provided with a first sealing component that surrounds the extension and is used to seal the first installation hole, and a peripheral surface of the valve core is provided with a second pressure relief channel that communicates with the first cavity;

A driving mechanism for driving the valve core to open or close the first installation hole, and the driving mechanism is connected with the other end of the valve core;

An elastic sealing component located in the second accommodating cavity, one end of the elastic sealing component is connected with the valve core, and the other end of the elastic sealing component is matched with the first pressure relief channel.

Using the cut-off valve of the utility model, when the outlet pneumatic cut-off valve is closed, and the pressure at the rear end of the cut-off valve rises to the warning value, the LNG can be communicated with the front end through the one-way valve core in the cut-off valve to complete the pressure release at the back end and protect the liquid filling soft Safety of tubes and dosing guns. Therefore, the utility model improves the safety, and enables the rear-end pipeline to automatically release pressure without adding other pressure-relief devices, simplifies the structure of the pipeline, and saves the pipeline cost.

Description of drawings

Figure 1 is a schematic structural diagram of the utility model.

Figure 2 is an enlarged view of the P part in Figure 1 (the shut-off valve is in a closed state);

Figure 3 is a schematic diagram of the shut-off valve in an open state;

Figure 4 is a schematic diagram of the shut-off valve in a pressure relief state when it is shut off;

1 is the valve body, 1a is the first cavity, 1b is the second cavity, 1c is the first isolation part, 1d is the mounting part, 1e is the second isolation part, A is the first opening, and B is the second opening;

2 is the valve core, 2a is the second accommodating cavity, 2b is the extension, 2c is the first pressure relief channel, and 2d is the second pressure relief channel;

3 is the connecting rod, 4 is the valve seat, 5 is the valve cover, 6 is the pneumatic actuator, 7 is the blocking part, 8 is the spring, 9 is the sealing part, 10 is the movable part, 11 is the retaining ring, 12 is the connecting head, 13 is the main gasket, 14 is a flat washer, 15 is a spring washer, 16 is a lock nut, and 17 is a sleeve.

Detailed ways

As shown in Figures 1 and 2, the shut-off valve for cryogenic pipelines of the present invention includes: a valve body 1 with a first accommodating cavity, a valve core 2 with a second accommodating cavity 2a, a driving mechanism, and an elastic seal Components, each part and the relationship between them is explained in detail below:

As shown in FIG. 1 and FIG. 2 , the valve body 1 is provided with a mounting seat that divides the first accommodating cavity into a first cavity 1a and a second cavity 1b. The mounting seat is provided with a first mounting hole. An assembly hole is provided on the peripheral surface of the body 1 , a first opening A is provided at one end of the valve body 1 , and a second opening B is provided at the other end of the valve body 1 .

As shown in FIG. 1 and FIG. 2 , the mounting seat includes a first isolation portion 1c, a mounting portion 1d, and a second isolation portion 1e. After one end of the first isolation portion 1c is connected to one end of the mounting portion 1d, the mounting portion 1d is mounted on the mounting portion 1d. A first angle is formed with the first isolation portion 1c, the other end of the mounting portion 1d is connected to one end of the second isolation portion 1e, and a second angle is formed between the mounting portion 1d and the second isolation portion 1e. Both ends of the mounting portion 1d extend along the axial direction of the valve body.

As shown in FIG. 1 and FIG. 2 , the first isolation portion 1c and the second isolation portion 1e are adapted to the cross-sectional shape of the valve body 1. When the first accommodating cavity adopts the shape of a cylinder or a drum, the first isolation portion 1c The second isolation part 1e is preferably in the shape of a fan, and the projection formed by the first isolation part 1c, the second isolation part 1e and the mounting part 1d along the axial direction of the valve body 1 is a circle, so that the mounting seat separates the first accommodating cavity A first cavity 1a and a second cavity 1b are formed.

As shown in Figures 1 and 2, one end of the valve core 2 is provided with an extension portion 2b, the extension portion 2b is matched with the first mounting hole on the mounting seat, and the extension portion 2b is provided with a first mounting hole communicating with the second accommodating cavity 2a. The pressure relief channel 2c, the valve core 2 is provided with a first sealing component surrounding the extension 2b and used to seal the first installation hole, and the valve core 2 is provided with the first cavity 1a on the peripheral surface The communicating second pressure relief channel 2d.

As shown in FIG. 1 and FIG. 2 , the first sealing assembly includes a main sealing washer 13 , a flat washer 14 , a spring washer 15 and a lock nut 16 , the main sealing washer 13 , the flat washer 14 , and the spring washer 15 After being sleeved on the extension part, the lock nut 16 is threadedly connected with the extension part 2b, and the main sealing washer 13 , the flat washer 14 and the spring washer 15 are clamped between the lock nut 16 and the valve core 2 .

As shown in FIG. 1 and FIG. 2 , an annular groove is provided on an end surface of one end of the valve core 2 , and one end of the main gasket 13 is matched with the annular groove. The first installation hole is a stepped hole. When the first installation hole is closed, the extension portion 2b is matched with the small diameter hole of the first installation hole, and one end of the flat gasket 14 is matched with the large diameter hole of the first installation hole. . The outer diameter of the spring washer 15 is smaller than the diameter of the small-diameter hole of the first installation hole, and a gap is formed between the spring washer 15 and the hole wall surface of the small-diameter hole of the first installation hole.

As shown in FIG. 1 and FIG. 2 , a driving mechanism for driving the valve core 2 to open or close the first installation hole, and the driving mechanism is connected to the other end of the valve core 2 . The driving mechanism includes a pneumatic actuator 6, a connecting rod 3, and a connecting head 12 connected with the other end of the valve core 2. One end of the connecting rod 3 is connected with one end of the pneumatic actuator 6, and the connecting head 12 is connected with the other end of the connecting rod 3. The connecting head 12 is threadedly connected with the valve core 2, the connecting head 12 is provided with a through hole, and the connecting rod 3 is fixed with a retaining ring 11 after passing through the through hole.

As shown in Figures 1 and 2, a valve seat 4 and a valve cover 5 are provided on the connecting rod 3, both the valve seat 4 and the valve cover 5 are provided with mounting holes, and the valve seat 4 and the valve cover 5 are sleeved on the connecting rod 3 , the connecting rod 3 and the valve cover 5 are expanded and tightened by the expansion part, and the valve seat 4 and the valve cover 5 are fixed by bolts. It also includes a sleeve 17, one end of the sleeve 17 extends into the assembly hole of the valve seat 4 and is fixed with the valve seat 4, the other end of the sleeve 17 is sleeved on the peripheral surface of the valve core 2, and the peripheral surface of the valve core 2 is A boss is provided on the surface, and the other end of the sleeve 17 is abutted against the boss.

As shown in FIG. 1 and FIG. 2 , the elastic sealing assembly is located in the second accommodating cavity, one end of the elastic sealing assembly is connected with the valve core 2 , and the other end of the elastic sealing assembly is matched with the first pressure relief channel 2c. The elastic sealing assembly includes a blocking member 7 fixedly connected with the valve core 2, a movable member 10, a spring 8, and a sealing member 9 for sealing the first pressure relief channel 2c. One end of the spring 8 is pressed against the blocking member 7, and the spring The other end of 8 abuts against one end of the movable part 10 , and one end of the sealing part 9 is matched with the other end of the movable part 10 . The tension of the spring 8 drives the movable member 10 to move, so that the sealing member 9 seals the first pressure relief channel 2c.

As shown in Figure 3, the pneumatic actuator 6 moves linearly by driving the connecting rod 3 and the valve core 2 (including the first sealing component fixed on the valve core 2). When the extension part 2b is completely separated from the first installation hole, the medium Flow from the first opening A to the second opening B. As shown in FIG. 2 , when the extension part 2b is completely matched with the first installation hole, the main gasket 13 and the flat gasket 14 form a seal on the first installation hole, thereby closing the first installation hole, and the medium can neither flow from the first installation hole. The opening A flows to the second opening B and cannot flow from the second opening B to the first opening A.

As shown in Figure 4, after the valve core 2 closes the first installation hole, when the medium in the pipeline connected to the second opening B is vaporized, and the pressure rise threatens the safety of the equipment, the vaporized medium enters from the second opening B into the second cavity 1b, and then into the first pressure relief channel 2c from the second cavity 1b. As the pressure increases, the gasification medium overcomes the force of the spring 8 and pushes the movable part 10 to move. A space is formed between the component 10 and the output port of the first pressure relief channel 2c, through which the vaporized medium flows into the second cavity 2a of the valve core 2, and then flows into the second cavity 2a through the second pressure relief channel 2d. In the first cavity 1a (the pressure relief path diagram is shown by the arrow in 4), the pressure relief of the second opening B at the rear end of the shut-off valve is completed.

The above-mentioned embodiments are only to describe the preferred embodiments of the present invention, and do not limit the scope of the present invention. On the premise of not departing from the design spirit of the present invention, those of ordinary skill in the art will Various modifications and improvements made by the scheme shall fall within the protection scope determined by the claims of the present utility model.

Claims (7)

1. A trip valve for a cryogenic pipeline, comprising:

the valve comprises a valve body with a first accommodating cavity, wherein an installation seat which divides the first accommodating cavity into a first cavity and a second cavity is arranged in the valve body, a first installation hole is formed in the installation seat, assembly holes are formed in the circumferential surface of the valve body, a first opening is formed in one end of the valve body, and a second opening is formed in the other end of the valve body;

the valve core is provided with a second accommodating cavity, one end of the valve core is provided with an extending part, the extending part is matched with a first mounting hole on the mounting seat, the extending part is provided with a first pressure relief channel communicated with the second accommodating cavity, the valve core is provided with a first sealing assembly surrounding the extending part and used for sealing the first mounting hole, and the peripheral surface of the valve core is provided with a second pressure relief channel communicated with the first cavity;

the driving mechanism drives the valve core to open or close the first mounting hole and is connected with the other end of the valve core;

and one end of the elastic sealing component is connected with the valve core, and the other end of the elastic sealing component is matched with the first pressure relief channel.

2. A shut-off valve according to claim 1, characterised in that the mounting seat comprises a first isolation portion, a mounting portion and a second isolation portion, wherein a first included angle is formed between the mounting portion and the first isolation portion after one end of the first isolation portion is connected with one end of the mounting portion, the other end of the mounting portion is connected with one end of the second isolation portion, and a second included angle is formed between the mounting portion and the second isolation portion.

3. A shut-off valve according to claim 2, wherein both ends of the mounting portion extend in the axial direction of the valve body.

4. The shut-off valve of claim 1, wherein the first sealing assembly comprises a main sealing gasket, a flat gasket, a spring gasket and a lock nut, the main sealing gasket, the flat gasket and the spring gasket are arranged on the extension portion, the lock nut is in threaded connection with the extension portion, and the main sealing gasket, the flat gasket and the spring gasket are clamped between the lock nut and the valve core.

5. The shut-off valve according to claim 4, wherein an annular groove is formed in the end face of one end of the valve core, and one end of the main seal gasket is matched with the annular groove;

the first mounting hole is a stepped hole, when the first mounting hole is turned off, the extending part is matched with the small-diameter hole of the first mounting hole, and one end of the flat gasket is matched with the large-diameter hole of the first mounting hole.

6. The shut-off valve of claim 1, wherein the drive mechanism comprises:

a pneumatic actuator;

one end of the connecting rod is connected with one end of the pneumatic actuating mechanism;

and the connector is connected with the other end of the valve core and the other end of the connecting rod.

7. The shut-off valve of claim 1 wherein the resilient seal assembly comprises:

the blocking component is fixedly connected with the valve core;

a movable part;

one end of the spring abuts against the blocking part, and the other end of the spring abuts against one end of the movable part;

and the sealing component is used for sealing the first pressure relief channel, and one end of the sealing component is matched with the other end of the movable component.

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