Pressure retaining valve

Abstract

A pressing cap is arranged at the top of a valve body, the pressing cap is in threaded connection with a valve rod below the pressing cap through a guide ring assembled in the pressing cap, and the bottom of the valve rod is in threaded assembly with a valve assembly; the valve core is assembled and connected with the valve assembly through the valve core guide sleeve, one end of the valve core is provided with an opening communicated with the valve body, and the other end of the valve core is provided with a spring seat in which a spring is assembled; a rotatable hand wheel is assembled above the pressing cap, and a hexagonal locking nut is assembled in the middle of the hand wheel. Compared with the prior art, the utility model has the advantages that: 1) medium inspection and confirmation can be conveniently carried out on a suspicious gas cylinder before filling, and the overall efficiency of gas filling is improved; (2) vacuumizing before filling is avoided, the purity of gas in the gas cylinder and safe use of the gas cylinder are guaranteed, and the vacuumizing cost is reduced; and 3) the safety of a gas supply unit and a gas consumption unit is improved, and the gas supply cost and the gas consumption cost are saved.

Description

Technical Field

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

[0002] A pressure maintaining valve is a valve that can ensure the purity and a certain pressure of the gas in a gas cylinder. In the prior art, a piston is installed in the valve body, and the sealing gasket at the lower end of the piston is in sealing contact with the valve body; the piston is connected to the lower part of the valve rod, a handwheel is installed on the upper part of the valve rod, a handwheel spring is arranged inside the handwheel, the handwheel spring is pressed on the valve rod through a handwheel cover, a guide sleeve is installed in a screw sleeve, the screw sleeve drives the guide sleeve to pass through the middle of the valve body and the piston and is connected to the air outlet of the valve body, under the action of a guide sleeve spring, the guide sleeve abuts against the valve body, and the upper sealing contact of the guide sleeve with the valve body forms a valve. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is that the current structural design of the pressure maintaining valve has deficiencies and high costs, resulting in poor actual use effects and high maintenance costs. Most enterprises do not use pressure maintaining valves, which poses safety hazards during the inspection of suspicious gas cylinders, and the subsequent processing costs increase.

[0004] To solve the above technical problems, the technical solution provided by the utility model is: a pressure maintaining valve, including a two-dimensional code identification plate, a hexagon locking nut, a handwheel, a compression cap, a valve rod, a valve core, an O-ring one, a valve assembly, an O-ring two, a guide ring, an anti-friction pad, a spring seat, a spring, an O-ring three, an O-ring five, a valve core guide sleeve, and a valve body. A compression cap is provided at the top of the valve body, and the compression cap is threadedly connected to the lower valve rod through a guide ring assembled inside. The bottom of the valve rod is threadedly assembled with the valve assembly; the valve core is assembled and connected to the valve assembly through the valve core guide sleeve. One end of the valve core is provided with an opening communicating with the valve body, and the other end is provided with a spring seat, and a spring is assembled inside the spring seat; a rotatable handwheel is assembled above the compression cap, and a hexagon locking nut is assembled in the middle of the handwheel.

[0005] The advantages of the utility model compared with the prior art are as follows: 1) It is convenient to check and confirm the medium of suspicious gas cylinders before filling, improving the overall filling efficiency;

[0006] 2) Avoid vacuum pumping before filling, ensure the gas purity in the gas cylinder and the safe use of the gas cylinder, and reduce the cost of vacuum pumping;

[0007] 3) Improve the safety of gas supply units and gas using units, and save gas supply and gas using costs.

[0008] Further, a two-dimensional code identification plate is assembled on the top of the handwheel.

[0009] Further, an O-ring two is assembled above the guide ring, and an anti-friction pad is assembled below.

[0010] Further, an O-ring seal one is assembled at one end of the valve core close to the opening of the valve body, and an O-ring seal three is assembled at the other end.

[0011] Further, an O-ring seal five is assembled inside the spring seat.

[0012] Further, an air inlet and an air outlet are provided on the valve body, and a cavity connecting the air inlet and the air outlet is provided inside the valve body. Description of the Drawings

[0013] Figure 1 is a schematic structural diagram of the name of the utility model patent.

[0014] As shown in the figure: 1. QR code identification plate, 2. Hexagonal lock nut, 3. Handwheel, 4. Compression cap, 5. Valve stem, 6. Valve core, 7. O-ring seal one, 8. Valve flap assembly, 9. O-ring seal two, 10. Guide ring, 11. Anti-friction pad, 12. Spring seat, 13. Spring, 14. O-ring seal three, 15. O-ring seal five, 16. Valve core guide sleeve, 17. Valve body. Detailed Description of the Invention

[0015] The following further describes the present utility model in detail with reference to the accompanying drawings.

[0016] When the present utility model is specifically implemented, as Figure 1 shown in the embodiment, a pressure maintaining valve is provided, which includes a QR code identification plate 1, a hexagonal lock nut 2, a handwheel 3, a compression cap 4, a valve stem 5, a valve core 6, an O-ring seal one 7, a valve flap assembly 8, an O-ring seal two 9, a guide ring 10, an anti-friction pad 11, a spring seat 12, a spring 13, an O-ring seal three 14, an O-ring seal five 15, a valve core guide sleeve 16, and a valve body 17. A compression cap 4 is provided at the top of the valve body 17, and the compression cap 4 is threadedly connected to the lower valve stem 5 through a guide ring 10 assembled inside; the bottom of the valve stem 5 is threadedly assembled with the valve flap assembly 8; the valve core 6 is assembled and connected to the valve flap assembly 8 through a valve core guide sleeve 16. One end of the valve core 6 is provided with an opening communicating with the valve body 17, and the other end is provided with a spring seat 12, and a spring 13 is assembled inside the spring seat 12; a rotatable handwheel 3 is assembled above the compression cap 4, and a hexagonal lock nut 2 is assembled in the middle of the handwheel 3.

[0017] In an embodiment of the present utility model, as Figure 1 shown, the product is mainly composed of the following parts in terms of structural composition:

[0018] 1) Valve body, an air inlet and an air outlet are provided on the valve body, and a cavity is provided inside the valve body, and the cavity is respectively communicated with the inlet and the outlet;

[0019] 2) The valve stem, compression nut, and valve are threadedly connected inside the valve body. The valve is connected to the valve stem. As the valve stem rotates, the control valve can open and close the air intake passage of the valve.

[0020] 3) The residual pressure holding device is horizontally arranged inside the valve body. The residual pressure holding device includes: a spring base, a piston, a spring, a bushing, and a seal.

[0021] In an embodiment of the present utility model, as Figure 1 shown, a two-dimensional code identification plate 1 is assembled on the top of the handwheel 3.

[0022] In an embodiment of the present utility model, as Figure 1 shown, a second O-ring seal 9 is assembled above the guide ring 10, and an anti-friction pad 11 is assembled below.

[0023] In an embodiment of the present utility model, as Figure 1 shown, a first O-ring seal 7 is assembled at one end of the valve core 6 close to the opening of the valve body 17, and a third O-ring seal 14 is assembled at the other end.

[0024] In an embodiment of the present utility model, as Figure 1 shown, a fifth O-ring seal 15 is assembled inside the spring seat 12.

[0025] In an embodiment of the present utility model, as Figure 1 shown, the valve body 17 is provided with an air inlet and an air outlet, and a cavity connecting the air inlet and the air outlet is provided inside the valve body 1.

[0026] In an embodiment of the present utility model, as Figure 1 shown, the working principle of the present utility model: When the valve is in the open state and the pressure inside the bottle is higher than the set pressure, the air outlet automatically opens. When the pressure inside the bottle is lower than the set pressure range, the piston automatically closes to ensure that there is residual air inside the gas. After using the pressure holding valve, it is ensured that there is no less than 0.05 Mpa of residual air inside the gas cylinder, which can not only improve safety but also bring economic benefits.

[0027] The above shows and describes the basic principle, main features, and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present utility model. Without departing from the spirit and scope of the present invention, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A pressure holding valve, comprising a two-dimensional code identification plate (1), a hexagon lock nut (2), a hand wheel (3), a gland nut (4), a valve stem (5), a valve core (6), an O-ring one (7), a valve assembly (8), an O-ring two (9), a guide ring (10), a wear pad (11), a spring seat (12), a spring (13), an O-ring three (14), an O-ring five (15), a valve core guide sleeve (16), and a valve body (17), characterized in that: A pressure cap (4) is provided at the top of the valve body (17). The pressure cap (4) is threadedly connected to the valve stem (5) below through a guiding ring (10) assembled inside. The bottom of the valve stem (5) is threadedly assembled with a valve assembly (8); the valve core (6) is assembled and connected to the valve assembly (8) through a valve core guide sleeve (16). One end of the valve core (6) is provided with an opening communicating with the valve body (17), and the other end is provided with a spring seat (12). A spring (13) is assembled inside the spring seat (12); a rotatable handwheel (3) is assembled above the pressure cap (4), and a hexagonal locking nut (2) is assembled in the middle of the handwheel (3). An O-ring seal II (9) is assembled above the guiding ring (10), and an anti-friction pad (11) is assembled below it. An O-ring seal I (7) is assembled at one end of the valve core (6) near the opening of the valve body (17), and an O-ring seal III (14) is assembled at the other end. An O-ring seal V (15) is assembled inside the spring seat (12).

2. The pressure-holding valve according to claim 1, characterized in that: A two-dimensional code identification plate (1) is assembled at the top of the handwheel (3).

3. The pressure-holding valve according to claim 1, characterized in that: An air inlet and an air outlet are provided on the valve body (17), and a cavity connecting the air inlet and the air outlet is provided inside the valve body (17).

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