Low-temperature back pressure valve

Abstract

The low-temperature back pressure valve comprises a valve body and a membrane cavity, a heat insulation block is arranged between the valve body and the membrane cavity, the membrane cavity comprises an upper membrane cover and a lower membrane cover, the upper membrane cover is fixedly connected with the lower membrane cover, a connecting rod is connected to the lower membrane cover in an inserted mode, and the connecting rod is connected with the membrane cavity in an inserted mode. The connecting rod penetrates through the heat insulation block and is fixedly connected with the connecting block located in the valve body. The thermal insulation material block is effectively arranged between the membrane cavity and the valve body, so that the back pressure valve can adapt to low-temperature scenes.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a low-temperature back pressure valve. Background Art

[0002] The term back pressure valve comes from Back Pressure Valve. It means that a certain pressure is formed due to the function of the valve, and the pressure can generally be adjusted. It can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. The opening and closing part is a disc-shaped valve plate that rotates around its own axis in the valve body to achieve the purpose of opening and closing or regulation. It mainly plays the role of cutting off and throttling on the pipeline. The most commonly used systems are fluid metering and dosing systems, hydraulic control systems, chemical reaction conditions, physical critical state control, etc.

[0003] The current back pressure valve is not able to effectively cope with the low temperature environment and cannot work effectively at low temperatures. Utility Model Content

[0004] The purpose of the utility model is to provide a low-temperature back-pressure valve to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a low-temperature back pressure valve, comprising a valve body and a diaphragm cavity, an insulation block is provided between the valve body and the diaphragm cavity, the diaphragm cavity comprises an upper diaphragm cover and a lower diaphragm cover, the upper diaphragm cover and the lower diaphragm cover are fixedly connected, a connecting rod is inserted into the lower diaphragm cover, the connecting rod passes through the insulation block and is fixedly connected to the connecting block located in the valve body.

[0006] Optionally, an inner retaining ring is provided between the temperature insulation block and the valve body, and the inner retaining ring and the temperature insulation block are connected via a stainless steel gasket.

[0007] Optionally, a diaphragm is provided in the diaphragm cavity, the connecting rod is fixed to the diaphragm by a fastening nut, a first spring seat is provided on the diaphragm, and a spring is provided on the spring seat.

[0008] Optionally, one end of the spring away from the diaphragm is connected to a second spring seat, and the second spring seat is connected to the adjusting rod.

[0009] Optionally, the spring outer shell is connected with a support cover, and the support cover is fixedly connected to the upper membrane cover.

[0010] Optionally, an upper cover is provided above the valve body, and the upper cover is fixedly connected to the outer periphery of the thermal insulation block.

[0011] Optionally, a back cover is provided below the valve body, a hexagonal screw is provided on the back cover, the hexagonal screw is plugged into the connecting block, a pad is provided at the connecting portion between the hexagonal screw and the connecting block, and a sealing ring is provided between the back cover and the valve body.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] By effectively arranging a temperature insulation block between the membrane cavity and the valve body, the back pressure valve can be adapted to use in low temperature scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0015] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0016] like Figure 1 As shown, a low-temperature back pressure valve comprises a valve body 20 and a membrane cavity 19, an insulation block 10 is arranged between the valve body 20 and the membrane cavity 19, the membrane cavity 19 comprises an upper membrane cover 5 and a lower membrane cover 8, the upper membrane cover 5 and the lower membrane cover 8 are fixedly connected, a connecting rod 9 is inserted into the lower membrane cover 8, the connecting rod 9 passes through the insulation block 10 and is fixedly connected to the connecting block 13 located in the valve body 20. The insulation block 10 is arranged on the traditional back pressure valve to separate the valve body 20 and the membrane cavity 19, which can effectively improve the back pressure valve to be applied in low temperature scenes. The insulation block 10 can include an outer cavity, and the outer cavity is filled with insulation materials, such as tetrafluoroethylene or UPE. A through hole is opened on the outer cavity, and a connecting pipe is inserted into the through hole, so that the insulation block 10 can be firmly connected to the membrane cavity 19. Similarly, a connection hole is provided above the connection block 13 , and the lower end of the connection rod 9 is inserted into the connection hole to achieve fixation between the insulation block 10 and the valve body 20 .

[0017] An inner snap ring 12 is provided between the insulation block 10 and the valve body 20, and the inner snap ring 12 is connected to the insulation block 10 via a stainless steel gasket 11. A diaphragm 7 is provided in the diaphragm cavity 19, and the connecting rod 9 is fixed to the diaphragm 7 via a fastening nut. A first spring seat 6 is provided on the diaphragm 7, and a spring 4 is provided on the first spring seat 6. The end of the spring 4 away from the diaphragm 7 is connected to a second spring seat 2, and the second spring seat 2 is connected to the adjusting rod 1. By adjusting the tightness of the adjusting rod 1, the closure and connection of the pipeline can be achieved.

[0018] A support cover 3 is connected to the outer surface of the spring 4 , and the support cover 3 is fixedly connected to the upper membrane cover 5 .

[0019] In order to effectively protect the valve body 20, an upper cover 18 is provided above the valve body 20, and the upper cover 18 is fixedly connected to the outer periphery of the insulation block 10. A rear cover 17 is provided below the valve body 20, and a hexagonal screw 15 is provided on the rear cover 17, and the hexagonal screw 15 is inserted into the connecting block 13, and a cushion block 14 is provided at the connecting portion between the hexagonal screw 15 and the connecting block 13, and a sealing ring 16 is provided between the rear cover 17 and the valve body 20.

[0020] During operation, the fluid enters the valve body 20 from port A, then passes through the connection block 13 and the insulation block 10 in sequence, squeezes the spring 4 to allow the fluid to enter the membrane cavity 19, then passes through the insulation block 10 and the connection block 13 in sequence, and finally flows out of the valve body 20 from the B outlet. When the fluid flows in the back pressure valve, it passes through the insulation block 10 twice, and the temperature of the fluid is effectively adjusted, so that the back pressure valve of the utility model can effectively adapt to low temperature scenes.

[0021] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A low temperature back pressure valve, characterized in that: The invention comprises a valve body (20) and a membrane cavity (19), wherein a temperature-insulating block (10) is provided between the valve body (20) and the membrane cavity (19), wherein the membrane cavity (19) comprises an upper membrane cover (5) and a lower membrane cover (8), wherein the upper membrane cover (5) and the lower membrane cover (8) are fixedly connected, wherein a connecting rod (9) is inserted into the lower membrane cover (8), and wherein the connecting rod (9) passes through the temperature-insulating block (10) and is fixedly connected to a connecting block (13) located in the valve body (20).

2. A cryogenic back pressure valve according to claim 1, characterized in that: An inner snap ring (12) is provided between the temperature insulation block (10) and the valve body (20), and the inner snap ring (12) and the temperature insulation block (10) are connected via a stainless steel gasket (11).

3. A cryogenic back pressure valve according to claim 2, characterized in that: A diaphragm (7) is provided in the diaphragm cavity (19), the connecting rod (9) is fixed to the diaphragm (7) via a fastening nut, a first spring seat (6) is provided on the diaphragm (7), and a spring (4) is provided on the first spring seat (6).

4. A cryogenic back pressure valve according to claim 3, characterized in that: One end of the spring (4) away from the diaphragm (7) is connected to a second spring seat (2), and the second spring seat (2) is connected to the adjustment rod (1).

5. A cryogenic back pressure valve according to claim 4, characterized in that: The spring (4) is outer-mounted with a support cover (3), and the support cover (3) is fixedly connected to the upper membrane cover (5).

6. A cryogenic back pressure valve according to claim 1, characterized in that: An upper cover (18) is provided above the valve body (20), and the upper cover (18) is fixedly connected to the outer periphery of the thermal insulation block (10).

7. The cryogenic back pressure valve according to claim 1, characterized in that: A rear cover (17) is provided below the valve body (20), a hexagonal screw (15) is provided on the rear cover (17), the hexagonal screw (15) is plugged into the connecting block (13), a cushion block (14) is provided at the connecting portion between the hexagonal screw (15) and the connecting block (13), and a sealing ring (16) is provided between the rear cover (17) and the valve body (20).

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