Pressure retaining valve

Abstract

The utility model belongs to the technical field of valves, and relates to a pressure retaining valve which comprises a valve body, and the valve body is provided with an air inlet, an air outlet, a sealing plug arranged opposite to the air outlet, an air inlet control assembly and an air outlet control assembly. The air inlet valve is characterized in that the air inlet control assembly comprises a valve rod, a valve clack and a plastic plug, wherein the valve clack is driven by the valve rod and can move, and the plastic plug is fixed to the lower portion of the valve clack. The plastic plug is positioned above the air inlet; the air outlet control assembly comprises an air core guide sleeve and an air core used in cooperation with the air core guide sleeve. The air core guide sleeve comprises a core door and a guide part located on one side of the core door. The guide part is positioned at the air outlet; and the valve clack is positioned in a hole above the core door. According to the pressure retaining valve, the air core guide sleeve is limited in the valve body through the valve clack and the sealing plug, the pressure retaining valve can be assembled only with the help of a conventional tool, and operation is more convenient and faster.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field, especially a kind of pressure retaining valve. BACKGROUND

[0002] The ordinary gas cylinder valve of prior art can be completely emptied in the opened state, without residual gas pressure, and air and impurities in the air can easily enter the gas cylinder during circulation, causing pollution. When refilled again, vacuum pumping or gas replacement is required, which is inefficient and wastes energy and resources. Patent No. CN202223437793.2 discloses a pressure retaining valve structure for gas cylinder, belonging to the technical field of valves, comprising a valve body assembly, which is provided with an opening and closing mechanism that is movably screwed to the valve body assembly. The valve body assembly includes a valve body, which is provided with a gas outlet at one end and a gas inlet at the lower end that is connected to the opening and closing mechanism. The valve body is provided with a guide sleeve that is located on the side of the opening and closing mechanism and is connected to the opening and closing mechanism and the gas inlet. The other side of the opening and closing mechanism is provided with a plug that is symmetrically distributed with the guide sleeve and is fixedly screwed to the valve body. The guide sleeve and the gas outlet are provided with a gas core that is movably connected to the gas outlet. The gas core is movably connected to the guide sleeve, and a spring is provided between the gas core and the guide sleeve. After long-term use or filling of some corrosive gases, the sealing ring on the gas core and the valve stem may be damaged and require maintenance. Since the guide sleeve is connected to the valve body by threads, the space inside the valve body is small, making it difficult to maintain the gas core. Therefore, the utility model provides a pressure retaining valve. SUMMARY

[0003] The main purpose of the utility model is to provide a pressure retaining valve. By removing the sealing plug and the valve stem cap, and then rotating the valve disc out of the valve body, the gas core guide sleeve and the gas core can be easily removed, making it easy to replace the sealing ring. Compared with the prior art, the gas core guide sleeve in this application is not fixed in the valve body, and can be easily removed with conventional tools, making the operation more convenient.

[0004] The utility model realizes the above-mentioned purpose through the following technical scheme: a pressure retaining valve, comprising a valve body, an air inlet, an air outlet, a sealing plug connected to the valve body by threads, an air inlet control assembly and an air outlet control assembly are provided on the valve body. The utility model is characterized by:

[0005] The air inlet control assembly includes a valve stem, a valve disc that can be displaced by the valve stem, and a plastic plug fixed below the valve disc.

[0006] The plastic plug is located above the air inlet.

[0007] The air outlet control assembly comprises an air core guide sleeve and an air core used in cooperation with the air core guide sleeve.

[0008] The air core guide sleeve comprises a core door and a guide part located at one side of the core door.

[0009] The guide part is located at the air outlet.

[0010] The valve flap is located in the hole above the core door.

[0011] Preferably, the top opening of the valve body is provided with a valve rod mounting hole, a valve rod is provided between the valve rod and the mounting hole, a valve rod pressure cap is threadedly connected to the mounting hole, the bottom end of the valve rod is connected with a valve flap, the top end of the valve flap is threadedly connected to the mounting hole, the bottom end of the valve rod is square-shaped, the upper end surface of the valve flap is provided with a square-shaped counterbore, the bottom end of the valve rod extends into the square-shaped counterbore, and the valve flap penetrates the core door.

[0012] Preferably, the air core rear end is provided with a spring accommodating hole, the air core front end is provided with a through hole in communication with the spring accommodating hole, the outer circle of the air core front end and the outer circle of the air core rear end are both provided with a sealing ring groove for mounting a sealing ring, and the sealing ring groove is connected with the sealing ring.

[0013] Preferably, the circumferential surface of the right end of the air core is machined with cross-distributed air guide grooves.

[0014] Preferably, the sealing plug is provided with a limiting hole opposite to one end of the core door, the core door is provided with a limiting protrusion extending into the limiting hole, and a corrugated spring is connected between the core door and the sealing plug.

[0015] The beneficial effects of the technical scheme of the utility model are as follows: the valve rod pressure cap and the sealing plug are both connected to the valve body through threads and are connected outside the valve body, the air core guide sleeve is limited in the valve body through the valve flap and the sealing plug, the guide sleeve is not fixed in the valve body, thereby facilitating assembly and maintenance, after the valve body is installed on the gas cylinder, the valve rod can be removed by unscrewing the valve rod pressure cap, thereby facilitating maintenance and replacement of the valve rod under the condition that the gas pressure in the cylinder is left. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is the layout of the example pressure maintaining valve when working.

[0017] Fig. 2 It is a valve body structure schematic view.

[0018] Fig. 3 It is an air core guide sleeve structure schematic view.

[0019] The numbers in the figure represent:

[0020] 1. Valve body; 2. Air inlet; 3. Air outlet; 4. Sealing plug; 5. Valve stem; 6. Valve disc; 7. Air core guide sleeve; 8. Air core; 9. Core door; 10. Guide part; 11. Valve stem cap; 12. Countersunk hole; 13. Spring receiving hole; 14. Through hole; 15. Sealing ring; 16. Air guide groove; 17. Corrugated spring; 18. Spring. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to specific embodiments.

[0022] Example:

[0023] like Figs. 1 to 3 As shown, a pressure-holding valve of this utility model includes a valve body 1, wherein the valve body 1 is provided with an air inlet 2, an air outlet 3, a sealing plug 4 disposed opposite to the air outlet 3, an air inlet control component, and an air outlet control component; characterized in that:

[0024] The intake control assembly includes a valve stem 5, a movable valve disc 6 driven by the valve stem 5, and a plastic plug fixed below the valve disc 6.

[0025] The plastic plug is located above the air inlet;

[0026] The air outlet control assembly includes an air core guide sleeve 7 and an air core 8 that cooperates with the air core guide sleeve 7.

[0027] The air core guide sleeve 7 includes a core door 9 and a guide portion 10 located on one side of the core door 9;

[0028] The guide part 10 is located at the air outlet 3;

[0029] The valve disc 6 is located in the hole above the core gate 9.

[0030] The valve body 1 has a valve stem mounting hole at its top. A valve stem cap 11 is provided between the valve stem 5 and the mounting hole and is threadedly connected to the mounting hole. A handwheel is connected to the top of the valve stem 5, and a valve disc 6 is connected to the bottom of the valve stem 5. The top of the valve disc 6 is threadedly connected to the mounting hole. The bottom of the valve stem 5 is square. A square countersunk hole 12 is provided on the upper surface of the valve disc 6. The bottom of the valve stem 5 extends into the square countersunk hole 12. The valve disc 6 passes through the core gate 9.

[0031] The air core 8 has a spring receiving hole 13 at its rear end and a through hole 14 at its front end that communicates with the spring receiving hole 13. A spring 18 is connected between the air core 8 and the air core guide sleeve. Both the front and rear outer rings of the air core 8 are provided with sealing ring grooves for installing sealing rings. An O-ring 15 is connected in the sealing ring groove.

[0032] The circumferential surface of the right end of the air core 8 is provided with air guide grooves 16 distributed in cross shape, which can disperse and guide the air flow when filling air, prevent cyclone and improve air intake efficiency.

[0033] The sealing plug 4 is provided with a limiting hole opposite to one end of the core door 9, the core door 9 is provided with a limiting protrusion extending into the limiting hole, and a corrugated spring 17 is connected between the core door 9 and the sealing plug 4.

[0034] The working process of the utility model is as follows: the valve body 1 is installed on the gas cylinder, the gas outlet is connected with the gas inlet nozzle, the hand wheel is rotated to open the gas inlet, high-pressure gas is introduced into the valve body 1 from the gas outlet, the gas pressure is higher than the elastic force provided by the spring, so that the air core 8 is pushed to slide to the left, so that the gas outlet is in an open state, and high-pressure gas can enter the gas cylinder, after filling gas, the pressure maintaining valve is closed, the gas inlet nozzle is removed, the gas pressure at the gas outlet is restored, and the air core 8 is reset under the elastic force of the spring to block the gas outlet; when it is needed to release the gas in the bottle, the hand wheel is rotated to open the gas inlet, high-pressure gas in the bottle enters the valve body 1, when the gas pressure in the valve body 1 is greater than the elastic force of the spring, the gas pressure pushes the air core 8 to slide to the left, so that the gas outlet is opened, and the gas in the bottle can be discharged, when the gas pressure is smaller than the elastic force of the spring, the air core 8 is reset under the action of the spring, the gas outlet is blocked, and the gas discharge is stopped, so that a certain gas pressure is left in the bottle; when it is needed to replace the sealing ring of the air core 8, the sealing plug 4 is removed, the valve rod pressure cap 11 is removed, the screw rod is rotated, the valve flap 6 is rotated out of the valve body 1, the air core guide sleeve 7 and the air core 8 can be poured out of the valve body 1, and the valve rod pressure cap 11 and the sealing plug 4 are connected with the valve body 1 through threads and are connected outside the valve body 1, so that the operation space is large and maintenance is facilitated.

[0035] The above only describes some embodiments of the utility model. Without departing from the creative concept of the utility model, those skilled in the art can make several modifications and improvements, and these all belong to the protection scope of the utility model.

Claims

1. A pressure retaining valve comprising a valve body, an air inlet, an air outlet, a sealing plug opposite to the air outlet, an air inlet control assembly and an air outlet control assembly; characterized in that: the air inlet control assembly comprises a valve rod, a displaceable valve disc driven by the valve rod and a plastic plug fixed below the valve disc; the plastic plug is located above the air inlet; the air outlet control assembly comprises a gas core guide sleeve and a gas core used in cooperation with the gas core guide sleeve; the gas core guide sleeve comprises a core door and a guide part located at one side of the core door; the guide part is located at the air outlet; the valve disc is located in a hole above the core door.

2. The pressure retaining valve of claim 1, wherein: a valve rod mounting hole is provided at the top of the valve body, a valve rod pressure cap is provided between the valve rod and the mounting hole and connected with the mounting hole by threads, the bottom end of the valve rod is connected with the valve disc, the top end of the valve disc is connected in the mounting hole by threads, the bottom end of the valve rod is square, the upper end surface of the valve disc is provided with a square counterbore, the bottom end of the valve rod extends into the square counterbore, and the valve disc penetrates the core door.

3. The pressure retaining valve of claim 1, wherein: a spring accommodating hole is provided at the rear end of the gas core, a through hole is provided at the front end of the gas core and connected with the spring accommodating hole, a spring is connected between the gas core and the gas core guide sleeve, a sealing ring groove for installing a sealing ring is provided on the outer circle of the front and rear ends of the gas core, and a sealing ring is connected in the sealing ring groove.

4. The pressure retaining valve of claim 3, wherein: gas guide grooves are processed on the circumferential surface of the right end of the gas core in cross distribution.

5. The pressure retaining valve of claim 1, wherein: a limiting hole is provided at the end of the sealing plug opposite to the core door, a limiting protrusion is provided in the limiting hole, and a corrugated spring is connected between the core door and the sealing plug.

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