A diaphragm valve for gas-liquid transmission pipeline

Abstract

This utility model applies to the field of electronic special gases and provides a diaphragm valve for a pneumatic-hydraulic transmission pipeline, comprising: a valve body and a cylinder body, wherein a cylinder nut and a cylinder flange are provided between the valve body and the cylinder body, and a first cylinder body shell and a second cylinder body shell are respectively provided on the cylinder body; a valve seat assembly located in the valve body, wherein a coupling is provided between the valve seat assembly and a first piston, and a valve cap is provided on the valve seat assembly; a diaphragm is provided between the valve seat assembly and the valve cap; and a valve cap nut is provided on the valve cap; and a first piston, a disc spring, an internal pressure plate, a piston rod, and a second piston disposed in the cylinder body, wherein the top of the second cylinder body shell has an air inlet, and a screw is provided inside the piston rod; the cylinder body is filled with oil. Compared with traditional purely pneumatically driven high-load spring actuators, this utility model has a significantly reduced design volume.

Description

Technical Field

[0001] This utility model relates to the field of electronic special gases, specifically a diaphragm valve for gas-liquid transmission pipelines. Background Technology

[0002] In the electronics specialty gases industry, the high-purity and ultra-high-purity gases used are often toxic, harmful, corrosive, flammable, and explosive, applied in specialty gas pipelines and equipment. Therefore, extremely stringent requirements are placed on the sealing performance and reliability of valves. This field has long been dominated by leading international brands, such as Rodda Legges of the United States.

[0003] In vehicle-mounted special gas pipeline equipment, there are certain limitations on valve parameters, such as requirements for small size, large flow rate, and high pressure resistance, which existing valves cannot meet. Therefore, in view of the above situation, there is an urgent need to provide a diaphragm valve for gas-hydraulic transmission pipelines to overcome the shortcomings in current practical applications. Utility Model Content

[0004] The purpose of this invention is to provide a diaphragm valve for gas-liquid transmission pipelines, which aims to solve the problems mentioned in the background art.

[0005] This utility model is implemented as follows: a diaphragm valve for a gas-liquid transmission pipeline, comprising:

[0006] The valve body and the cylinder body are provided with a cylinder nut and a cylinder flange between the valve body and the cylinder body, and a first cylinder body shell and a second cylinder body shell are respectively provided on the cylinder body.

[0007] A valve seat assembly is located within the valve body. A coupling is also provided between the valve seat assembly and the first piston. A valve cap is provided on the valve seat assembly. A diaphragm is provided between the valve seat assembly and the valve cap. A valve cap nut is provided on the valve cap.

[0008] The cylinder contains a first piston, a disc spring, an internal pressure plate, a piston rod, and a second piston. The top of the second cylinder housing has an air inlet, and a screw is installed inside the piston rod. The cylinder is filled with oil.

[0009] As a further embodiment of this utility model: the top of the second cylinder body shell is also provided with a first external hexagonal pressure relief bolt, and there is a first gasket between the first external hexagonal pressure relief bolt and the second cylinder body shell.

[0010] As a further embodiment of this utility model, an EPDM O-ring is also provided between the cylinder body and the outer shell of the second cylinder body.

[0011] As a further embodiment of this utility model: a first nitrile rubber O-ring is also provided between the second piston and the cylinder;

[0012] A second nitrile rubber O-ring and an O-ring are also provided between the second piston and the piston rod.

[0013] As a further embodiment of this utility model: a first retaining ring and a third nitrile rubber O-ring are also provided between the piston rod and the first piston;

[0014] A fourth nitrile rubber O-ring is also provided between the first piston and the cylinder.

[0015] As a further embodiment of this invention, a cylindrical pin for restricting the first piston is also provided inside the cylinder.

[0016] As a further embodiment of this utility model: a fifth nitrile rubber O-ring and a second retaining ring are also provided between the bottom of the first piston and the cylinder.

[0017] As a further embodiment of this utility model: a sixth nitrile rubber O-ring is also provided between the valve cap nut and the valve body;

[0018] A second gasket and a fluororubber O-ring are also provided between the valve cap nut and the coupling.

[0019] As a further embodiment of this utility model, a second external hexagonal pressure relief bolt is also provided at the bottom of the valve body.

[0020] As a further embodiment of this utility model: a third external hexagonal pressure relief bolt is also provided on the side of the second cylinder housing, and a third gasket is provided between the third external hexagonal pressure relief bolt and the second cylinder housing.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] Under normal conditions, the valve is in the closed state under the installation load of the disc spring;

[0023] When the top is vented with driving air, the second piston uses the lever amplification principle to generate an equivalent high-pressure distribution force on the pressure-bearing surface of the lower piston rod to balance the load of the large piston. Since an incompressible liquid (oil) is used as the driving medium, the first piston will also receive a hydraulic high-pressure distribution force, thereby compressing the large load disc spring at the top and opening the valve.

[0024] The uniform force amplification ratio of the gas-to-liquid circuit conversion reaches 10 times, and the design volume is significantly reduced compared to the traditional pure pneumatic drive large load spring actuator.

[0025] In some applications, the valve must always be in a normally closed state to prevent accidental opening. This can be achieved by manually turning the first cylinder housing clockwise downwards, restricting the movement of the cylindrical pin, thus realizing the normally closed locking function. Additionally, when connecting a coupling, it can restrict the rotation of the first piston to ensure effective thread connection.

[0026] For valves used in vehicle-mounted equipment, all external static load threaded connections are fixed with thread sealant and marked with adhesive to facilitate staff to check the valve's looseness at any time;

[0027] This valve is used for handling flammable, explosive, toxic, and harmful gases, such as silane. It is an improvement on the traditional diaphragm valve. With the combined action of the sixth nitrile rubber O-ring, fluororubber O-ring, third gasket, and third external hexagonal relief bolt, even if the diaphragm fails due to fatigue, the hazardous gas will be trapped within the sealed space of the sealing ring. During routine maintenance and leak testing, the leakage at the seal formed by the third gasket and the third external hexagonal relief bolt can be tested to assess the valve's diaphragm failure.

[0028] The clearance compensation design, in order to further optimize the fatigue life of the valve, uses thin gaskets to eliminate accumulated manufacturing tolerances, so that the displacement of the diaphragm assembly is controlled within a reasonable space. Attached Figure Description

[0029] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of this utility model.

[0031] Figure 2 This is a partial structural schematic diagram of the present invention.

[0032] In the attached diagram: 1-Valve body, 2-Valve seat assembly, 3-Diaphragm, 4-Valve cap, 5-Valve cap nut, 6-Coupling, 7-Cylinder nut, 8-Cylinder flange, 9-Cylinder body, 10-First cylinder housing, 11-Disc spring, 12-First piston, 13-Piston rod, 14-Inner cylinder pressure plate, 15-Screw, 16-O-ring, 17-Second piston, 18-Second cylinder housing, 19-First gasket, 20-First external hexagonal pressure relief bolt, 21-First nitrile rubber O-ring, 22- 23-Second nitrile rubber O-ring, 24-First retaining ring, 25-Third nitrile rubber O-ring, 26-Oil, 27-Cylindrical pin, 28-Fourth nitrile rubber O-ring, 29-Fifth nitrile rubber O-ring, 30-Second retaining ring, 31-Conical head cross-groove screw, 32-Sixth nitrile rubber O-ring, 33-Second washer, 34-Fluororubber O-ring, 35-Second external hexagonal pressure relief bolt, 36-Third washer, 37-Third external hexagonal pressure relief bolt. Detailed Implementation

[0033] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0034] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0037] Please see Figure 1 and Figure 2 This utility model provides a gas-hydraulic transmission pipeline diaphragm valve, which includes:

[0038] The valve body 1 and the cylinder body 9 are provided. A cylinder nut 7 and a cylinder flange 8 are also provided between the valve body 1 and the cylinder body 9. A first cylinder shell 10 and a second cylinder shell 18 are also provided on the cylinder body 9.

[0039] A valve seat assembly 2 is located inside the valve body 1. A coupling 6 is also provided between the valve seat assembly 2 and the first piston 12. A valve cap 4 is provided on the valve seat assembly 2. A diaphragm 3 is provided between the valve seat assembly 2 and the valve cap 4. A valve cap nut 5 is provided on the valve cap 4.

[0040] The cylinder body 9 is equipped with a first piston 12, a disc spring 11, an internal pressure plate 14, a piston rod 13, and a second piston 17. The top of the second cylinder body shell 18 has an air inlet. A screw 15 is also provided inside the piston rod 13. The cylinder body 9 is filled with oil 26.

[0041] The top of the second cylinder housing 18 is also provided with a first external hexagonal pressure relief bolt 20, and a first gasket 19 is provided between the first external hexagonal pressure relief bolt 20 and the second cylinder housing 18; a EPDM O-ring 22 is also provided between the cylinder 9 and the second cylinder housing 18; a first nitrile rubber O-ring 21 is also provided between the second piston 17 and the cylinder 9; a second nitrile rubber O-ring 23 and an O-ring 16 are also provided between the second piston 17 and the piston rod 13; a first retaining ring 24 and a third nitrile rubber O-ring 25 are also provided between the piston rod 13 and the first piston 12; a fourth nitrile rubber O-ring is also provided between the first piston 12 and the cylinder 9. The cylinder body 9 is also provided with a cylindrical pin 27 for restricting the first piston 12; a fifth nitrile rubber O-ring 29 and a second retaining ring 30 are also provided between the bottom of the first piston 12 and the cylinder body 9; a sixth nitrile rubber O-ring 32 is also provided between the valve cap nut 5 and the valve body 1; a second gasket 33 and a fluororubber O-ring 34 are also provided between the valve cap nut 5 and the coupling 6; a second external hexagonal pressure relief bolt 35 is also provided at the bottom of the valve body 1; a third external hexagonal pressure relief bolt 37 is also provided on the side of the second cylinder body shell 18, and a third gasket 36 is provided between the third external hexagonal pressure relief bolt 37 and the second cylinder body shell 18.

[0042] In an embodiment of this utility model, the bottom of the cylinder flange 8 also has a conical head cross groove screw 31;

[0043] Under normal conditions, the valve is in the closed state under the installation load of the disc spring 11;

[0044] When the top is vented with driving air, the second piston 17 uses the lever amplification principle to generate an equivalent high pressure distribution force on the pressure-bearing surface of the lower piston rod 13 to balance the load of the large piston. Since an incompressible liquid (oil 26) is used as the driving medium, the first piston 12 will also receive a hydraulic high pressure distribution force, thereby compressing the top large load disc spring 11 and opening the valve.

[0045] The uniform force amplification ratio of the gas-to-liquid circuit conversion reaches 10 times, and the design volume is significantly reduced compared to the traditional pure pneumatic drive large load spring actuator.

[0046] In some applications, the valve must always be in a normally closed state to prevent accidental opening. This can be achieved by manually turning the first cylinder housing 10 clockwise downwards, restricting the movement of the cylindrical pin 27, thus realizing the normally closed locking function. Additionally, when connecting the coupling 6, it can restrict the rotation of the first piston 12 to ensure effective thread connection.

[0047] For valves used in vehicle-mounted equipment, all external static load threaded connections are fixed with thread sealant and marked with adhesive to facilitate staff to check the valve's looseness at any time;

[0048] This valve is used for handling flammable, explosive, toxic, and harmful gases, such as silane. It is an improvement on the traditional diaphragm valve. With the combined action of the sixth nitrile rubber O-ring 32, the fluororubber O-ring 34, the third gasket 36, and the third external hexagonal pressure relief bolt 37, even if the diaphragm fails due to fatigue, the hazardous gas will be trapped within the sealed space of the sealing ring. During routine maintenance and leak testing, the leakage at the seal formed by the third gasket 36 and the third external hexagonal pressure relief bolt 37 can be tested to assess the valve's diaphragm failure.

[0049] The clearance compensation design, in order to further optimize the fatigue life of the valve, uses thin gaskets to eliminate accumulated manufacturing tolerances, so that the displacement of the diaphragm assembly is controlled within a reasonable space.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A diaphragm valve for a pneumatic-hydraulic transmission pipeline, comprising a valve body (1) and a cylinder body (9), wherein a cylinder nut (7) and a cylinder flange (8) are further provided between the valve body (1) and the cylinder body (9), and a first cylinder shell (10) and a second cylinder shell (18) are respectively provided on the cylinder body (9), characterized in that, Also includes: A valve seat assembly (2) is located inside the valve body (1). A coupling (6) is also provided between the valve seat assembly (2) and the first piston (12). A valve cap (4) is provided on the valve seat assembly (2). A diaphragm (3) is provided between the valve seat assembly (2) and the valve cap (4). A valve cap nut (5) is provided on the valve cap (4). The cylinder (9) includes a first piston (12), a disc spring (11), an internal pressure plate (14), a piston rod (13), and a second piston (17). The top of the second cylinder housing (18) has an air inlet. A screw (15) is also provided inside the piston rod (13). The cylinder (9) is filled with oil (26).

2. The pneumatic-hydraulic transmission pipe diaphragm valve according to claim 1, characterized in that, The top of the second cylinder housing (18) is also provided with a first external hexagonal pressure relief bolt (20), and there is a first gasket (19) between the first external hexagonal pressure relief bolt (20) and the second cylinder housing (18).

3. The diaphragm valve for gas-liquid transmission pipelines according to claim 1, characterized in that, A EPDM O-ring (22) is also provided between the cylinder (9) and the second cylinder shell (18).

4. The pneumatic-hydraulic transmission conduit diaphragm valve according to claim 3, characterized in that, A first nitrile rubber O-ring (21) is also provided between the second piston (17) and the cylinder (9); A second nitrile rubber O-ring (23) and an O-ring (16) are also provided between the second piston (17) and the piston rod (13).

5. The pneumatic-hydraulic transmission conduit diaphragm valve according to claim 1, characterized in that, A first retaining ring (24) and a third nitrile rubber O-ring (25) are also provided between the piston rod (13) and the first piston (12). A fourth nitrile rubber O-ring (28) is also provided between the first piston (12) and the cylinder (9).

6. The pneumatic-hydraulic transmission conduit diaphragm valve according to claim 5, characterized in that The cylinder (9) is also provided with a cylindrical pin (27) for restricting the first piston (12).

7. The pneumatic-hydraulic transmission conduit diaphragm valve according to claim 5, characterized in that A fifth nitrile rubber O-ring (29) and a second retaining ring (30) are also provided between the bottom of the first piston (12) and the cylinder (9).

8. The pneumatic-hydraulic transmission tube diaphragm valve according to claim 1, characterized in that, A sixth nitrile rubber O-ring (32) is also provided between the valve cap nut (5) and the valve body (1); A second gasket (33) and a fluororubber O-ring (34) are also provided between the valve cap nut (5) and the coupling (6).

9. The pneumatic-hydraulic transmission pipe diaphragm valve according to claim 1 or 8, characterized in that The bottom of the valve body (1) is also provided with a second external hexagonal pressure relief bolt (35).

10. The pneumatic-hydraulic transmission conduit diaphragm valve according to claim 1, characterized in that, The second cylinder housing (18) is also provided with a third external hexagonal pressure relief bolt (37) on its side, and a third gasket (36) is provided between the third external hexagonal pressure relief bolt (37) and the second cylinder housing (18).

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