Pressure retaining valve with safety device

Abstract

The utility model provides a pressure retaining valve with a safety device, which comprises a pressure retaining valve body and a pressure retaining valve cover, a main piston and a pressure retaining piston are fixedly arranged in the pressure retaining valve body, a water outlet and a water inlet are arranged on the pressure retaining valve body, a through first water inlet channel is arranged in the pressure retaining valve body, and a second water inlet channel is arranged in the pressure retaining valve cover. A first water inlet channel is formed in the pressure retaining valve body and connected with the water inlet, a through second water inlet channel is formed in the pressure retaining valve body, the first water inlet channel is communicated with the second water inlet channel, the pressure retaining piston is communicated with the water outlet, the main piston is communicated with the water inlet, and a safety relief device is arranged in the pressure retaining valve body. The safety relief device is communicated with the second water inlet channel, a red copper pad is fixedly arranged on one side of the safety relief device, and a safety screw plug is fixedly connected to the outer side of the safety relief device. The check valve can detect the internal pressure value of the valve body and can keep the internal pressure of the valve body within an allowable pressure range all the time.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves and relates to a pressure-maintaining valve with a safety device. Background Art

[0002] The pressure maintaining valve is a special control valve whose main function is to maintain the stability of the pressure in the system. It can control the pressure in the system and keep the pressure in the system within a safe range, thereby avoiding unsafe factors such as overpressure and underpressure in the pipeline network.

[0003] A Chinese patent with publication number CN213982032U discloses a pressure-maintaining valve, including a valve body, a valve stem and a handwheel. A main channel is provided in the valve body, a valve assembly and a valve body pressure cap are arranged in the main channel, one end of the valve body is connected to the valve assembly, the other end of the valve body passes through the valve body pressure cap and extends to the outside of the valve body to be connected to the handwheel, a pressure-maintaining device is provided on one side of the valve body, a secondary channel is provided in the pressure-maintaining device, the pressure-maintaining device includes a screw sleeve and a valve core, an installation groove is provided at one end of the secondary channel, one side of the installation groove partially or completely penetrates one side of the main channel to form a connecting hole, the screw sleeve is fixedly arranged in the installation groove, the valve core is slidably arranged on the top of the screw sleeve to control the opening and closing of the secondary channel.

[0004] The pressure-maintaining valve provided by the patent is not provided with a safety device, and the safety performance of the pressure-maintaining valve is insufficient when used in conjunction with a receiving part. Utility Model Content

[0005] The utility model aims to provide a pressure-maintaining valve with a safety device in view of the above-mentioned problems existing in the prior art.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a pressure-maintaining valve with a safety device, comprising a pressure-maintaining valve body and a pressure-maintaining valve cover, a main piston and a pressure-maintaining piston are fixedly arranged inside the pressure-maintaining valve body, a water outlet and a water inlet are provided on the pressure-maintaining valve body, a first through water inlet channel is provided inside the pressure-maintaining valve body, the first water inlet channel is connected to the water inlet, a second through water inlet channel is provided inside the pressure-maintaining valve body, the first water inlet channel and the second water inlet channel are communicated, the pressure-maintaining piston is connected to the water outlet, the main piston is connected to the water inlet, a safety relief device is arranged inside the pressure-maintaining valve body, the safety relief device is communicated with the second water inlet channel, a copper pad is fixedly arranged on one side of the safety relief device, and a safety screw plug is fixedly connected to the outside of the safety relief device.

[0007] In the above-mentioned pressure-maintaining valve with a safety device, a spring is arranged inside the pressure-maintaining piston, a pressure-maintaining connecting block is fixedly connected to one side of the pressure-maintaining piston, and a pressure-maintaining locking cap is fixedly connected to the outer side of the pressure-maintaining connecting block.

[0008] In the above-mentioned pressure-maintaining valve with a safety device, a main piston sealing gasket is sealed below the main piston.

[0009] In the above-mentioned pressure-maintaining valve with a safety device, the pressure-maintaining valve cover is fixedly installed on the upper end of the pressure-maintaining valve body, and a pressure-maintaining valve gasket is fixedly installed at the connection between the pressure-maintaining valve cover and the pressure-maintaining valve body.

[0010] In the above-mentioned pressure-maintaining valve with a safety device, a hand wheel is installed on the upper end of the valve cover of the pressure-maintaining valve, and a hexagonal flange screw is arranged below the hand wheel, and the hexagonal flange screw is connected to the valve cover of the pressure-maintaining valve.

[0011] Compared with the prior art, the pressure-maintaining valve with a safety device provided by the utility model has the following beneficial effects: by adding a safety relief device inside the pressure-maintaining valve body, the safety relief device is connected to the second water inlet channel inside the pressure-maintaining valve body, when the pressure value inside the pressure-maintaining valve body exceeds the limit value, the safety relief device discharges the medium inside the utility model, thereby improving the safety of use of the utility model, and a copper pad and a safety screw plug are arranged on the outside of the safety relief device, thereby effectively improving the sealing performance of the safety relief device. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0013] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model.

[0014] In the figure: 1. pressure-maintaining valve body; 11. water outlet; 12. water inlet; 13. first water inlet channel; 14. second water inlet channel; 2. pressure-maintaining valve cover; 21. pressure-maintaining valve gasket; 3. main piston; 31. main piston sealing gasket; 4. pressure-maintaining piston; 41. spring; 42. pressure-maintaining connecting block; 43. pressure-maintaining locking cap; 5. safety relief device; 51. copper gasket; 52. safety plug; 6. handwheel; 7. hexagonal flange screw. DETAILED DESCRIPTION

[0015] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0016] like Figure 1 to Figure 2As shown, this embodiment includes a pressure-maintaining valve body 1 and a pressure-maintaining valve cover 2. A main piston 3 and a pressure-maintaining piston 4 are fixedly arranged inside the pressure-maintaining valve body 1. The main piston 3 and the pressure-maintaining piston 4 are arranged vertically. Specifically, the main piston 3 is arranged in a vertical direction, and the pressure-maintaining piston 4 is arranged in a horizontal direction. A vertical water inlet 12 is opened inside the pressure-maintaining valve body 1, and the main piston 3 is connected to the water inlet 12. A vertically penetrating first water inlet channel 13 is opened inside the pressure-maintaining valve body 1, and the first water inlet channel 13 is connected to the water inlet 12. A penetrating second water inlet channel 13 is opened inside the pressure-maintaining valve body 1. The water channel 14, the first water inlet channel 13 and the second water inlet channel 14 are connected, and the second water inlet channel 14 is arranged in a transverse direction. A transverse water outlet 11 is opened inside the pressure maintaining valve body 1, and the pressure maintaining piston 4 is connected to the water outlet 11. A safety relief device 5 is arranged inside the pressure maintaining valve body 1, and the safety relief device 5 is connected to the second water inlet channel 14. A copper pad 51 is fixedly arranged on one side of the safety relief device 5, and the copper pad 51 plays a shock-absorbing role. A safety screw plug 52 is fixedly connected to the outside of the safety relief device 5, and the safety screw plug 52 plays a sealing role.

[0017] To elaborate further, Figure 1 to Figure 2 As shown, a spring 41 is arranged inside the pressure-maintaining piston 4 , a pressure-maintaining connecting block 42 is fixedly connected to one side of the pressure-maintaining piston 4 , and a pressure-maintaining locking cap 43 is fixedly connected to the outer side of the pressure-maintaining connecting block 42 .

[0018] To elaborate further, Figure 1 to Figure 2 As shown, the pressure-maintaining valve cover 2 is fixedly installed on the upper end of the pressure-maintaining valve body 1, and a pressure-maintaining valve gasket 21 is fixedly installed at the connection between the pressure-maintaining valve cover 2 and the pressure-maintaining valve body 1. A handwheel 6 is installed on the upper end of the pressure-maintaining valve cover 2, and a hexagonal flange screw 7 is arranged below the handwheel 6, which is connected to the pressure-maintaining valve cover 2.

[0019] The working principle of the utility model is as follows: when the utility model is connected with a pipeline, the medium enters the main piston 3 and the pressure-maintaining piston 4 from the water inlet 12 and through the first water inlet channel 13, and a part of the medium enters the safety relief device 5 through the second water inlet channel 14. The safety relief device 5 detects the pressure value inside the pressure-maintaining valve body 1.

[0020] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0021] Although various terms are used more frequently in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A pressure-maintaining valve with a safety device, comprising a pressure-maintaining valve body (1) and a pressure-maintaining valve cover (2), wherein a main piston (3) and a pressure-maintaining piston (4) are fixedly arranged inside the pressure-maintaining valve body (1), and a water outlet (11) and a water inlet (12) are formed on the pressure-maintaining valve body (1), characterized in that: A through first water inlet passage (13) is provided inside the pressure-maintaining valve body (1), and the first water inlet passage (13) is connected to the water inlet (12). A through second water inlet passage (14) is provided inside the pressure-maintaining valve body (1), and the first water inlet passage (13) and the second water inlet passage (14) are connected. The pressure-maintaining piston (4) is connected to the water outlet (11), and the main piston (3) is connected to the water inlet (12). A safety relief device (5) is provided inside the pressure-maintaining valve body (1), and the safety relief device (5) is connected to the second water inlet passage (14). A copper pad (51) is fixedly provided on one side of the safety relief device (5), and a safety screw plug (52) is fixedly connected to the outside of the safety relief device (5).

2. A pressure-maintaining valve with a safety device according to claim 1, characterized in that: A spring (41) is arranged inside the pressure-maintaining piston (4), a pressure-maintaining connection block (42) is fixedly connected to one side of the pressure-maintaining piston (4), and a pressure-maintaining locking cap (43) is fixedly connected to the outer side of the pressure-maintaining connection block (42).

3. The pressure-maintaining valve with a safety device according to claim 1, characterized in that: A main piston sealing pad (31) is provided sealingly below the main piston (3).

4. The pressure-maintaining valve with a safety device according to claim 1, characterized in that: The pressure-maintaining valve cover (2) is fixedly mounted on the upper end of the pressure-maintaining valve body (1), and a pressure-maintaining valve gasket (21) is fixedly mounted at the connection between the pressure-maintaining valve cover (2) and the pressure-maintaining valve body (1).

5. The pressure-maintaining valve with a safety device according to claim 1, characterized in that: A hand wheel (6) is mounted on the upper end of the pressure-maintaining valve cover (2), a hexagonal flange screw (7) is arranged below the hand wheel (6), and the hexagonal flange screw (7) is connected to the pressure-maintaining valve cover (2).

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