Low-pressure spring type pressure release valve

Abstract

The utility model belongs to the safety pressure relief technology, and particularly relates to a low-pressure spring type pressure relief valve which comprises a shell 1, a valve rod 2, a rubber sealing gasket 3, a spring 4, a lower spring seat 5, an upper spring seat 6 and a check ring 7. According to the low-pressure spring type pressure release valve, the valve rod 1 is guided through a conical fillet structure, the spring 4 and the valve rod 2 are fixed in the shell through the upper spring seat 6, the lower spring seat 5 and the check ring 7, and a sealing cover of the valve rod 2 is attached to the rubber sealing gasket 3 to achieve the sealing function; the spring pressing type pressure release valve has the advantages of being simple in structure, low in cost, stable in low-pressure-resistant air tightness and the like, and is suitable for various use environments.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of safety explosion-proof pressure relief, and particularly relates to a low-pressure spring type pressure relief valve. BACKGROUND

[0002] The low-pressure spring type pressure relief valve is widely applied to various pressure containers of aircrafts and is used as a device for guaranteeing the safe pressure relief of the pressure containers under overpressure.

[0003] At present, the sealing structure of the low-pressure spring type pressure relief valve mainly directly completes a taper sealing with a valve body by relying on a polytetrafluoroethylene / polyether ether ketone gasket, which leads to the change of the material performance of the polyether ether ketone / polytetrafluoroethylene under low pressure and high-low temperature conditions, and causes the air leakage at the sealing position. That is, under the low pressure and high-low temperature conditions, the traditional polytetrafluoroethylene / polyether ether ketone sealing gasket has certain air leakage safety hazards. CONTENT OF THE INVENTION

[0004] The application aims to solve the problems of poor low-pressure sealing and weak high-low temperature resistance of the traditional structure air release valve, and provides a low-pressure spring type pressure relief valve.

[0005] The application provides a low-pressure spring type pressure relief valve, which comprises:

[0006] A valve body 1, one end of the valve body 1 is provided with a tapered round corner which is used as a guide for a valve rod 2, and a sealing gasket groove is arranged at the end face of the valve body 1;

[0007] A valve rod 2 arranged in the valve body 1, one end of the valve rod is provided with a sealing cover;

[0008] A rubber sealing gasket 3 arranged in the sealing gasket groove, wherein the sealing cover and the rubber sealing gasket complete sealing.

[0009] Preferably, a spring is further included, wherein the sealing cover has a tapered annular surface, and the tapered annular surface presses the rubber sealing gasket 3 to complete sealing under the stretching action of the spring 4.

[0010] Preferably, an upper spring seat and a lower spring seat are further included, wherein the spring is limited in action under the constraint action of the upper spring seat 6 and the lower spring seat 5.

[0011] Preferably, the upper spring seat 6 and the valve rod 2 are fixed in position by a check ring 7.

[0012] Preferably, the shell 1, the valve rod 2, the lower spring seat 5 and the upper spring seat 6 are all composed of 20Cr13 stainless steel.

[0013] Preferably, the rubber sealing gasket 3 has a protruding part which is matched with the sealing gasket groove, and the rubber sealing gasket is composed of 5171 rubber.

[0014] The application has the following technical effects:

[0015] The utility model discloses abandoned the structure of traditional polytetrafluoroethylene type sealing gasket, directly sets up the sealing cover structure on valve stem 2, completes the sealing action through the sealing cover on valve stem 2 and the rubber sealing gasket 3 of high and low temperature resistance, corrosion resistance. The low pressure spring type pressure relief valve pressure relief action response is faster, and low pressure air tightness is better. This structure, effectively improve the low pressure air tightness of the air release valve, also reduce the security risk of air leakage. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a kind of low pressure spring type pressure relief valve structure schematic diagram provided by the embodiment of the application. DETAILED DESCRIPTION

[0017] Please refer to Figure 1 Low pressure spring type pressure relief valve, through the restraint of upper spring seat 6 and lower spring seat 5, complete the limiting action to spring.

[0018] Valve body 1 is also provided with taper face limit setting.

[0019] The end surface of valve body 1 is provided with annular groove for limiting rubber sealing ring 3.

[0020] Valve stem 2 is limited and fixed by stop ring 7 and upper spring seat 6.

[0021] Rubber sealing gasket 3 is composed of 5171 rubber. The material has the advantages of high and low temperature resistance and corrosion resistance.

[0022] The compression force of spring 4 is required to provide compression force not less than 35N under 4mm compression state.

[0023] Valve body 1, valve stem 2, lower spring seat 5 and upper spring seat 6 are composed of 20Cr13 stainless steel. The structure can meet the performance requirements of high pressure resistance, corrosion resistance and high strength.

[0024] When installing low pressure spring type pressure relief valve, inflate end is screwed into pressure vessel to complete sealing action. When deflation is needed, deflate end is inserted into deflation tool, spring 4 drives valve stem 2 to leave rubber sealing gasket 3 to complete deflation action.

[0025] The utility model discloses abandoned the structure of traditional polytetrafluoroethylene type sealing gasket, directly sets up the sealing cover structure on valve stem 2, completes the sealing action through the sealing cover on valve stem 2 and the rubber sealing gasket 3 of high and low temperature resistance, corrosion resistance. The low pressure spring type pressure relief valve pressure relief action response is faster, and low pressure air tightness is better. This structure, effectively improve the low pressure air tightness of the air release valve, also reduce the security risk of air leakage.

[0026] The utility model provides a kind of low-pressure spring type pressure relief valve. Including shell 1, valve stem 2, rubber sealing pad 3, spring 4, lower spring seat 5, upper spring seat 6, baffle ring 7;The utility model low-pressure spring type pressure relief valve is guided to valve stem 1 using the structure of conic fillet, and spring 4 and valve stem 2 are fixed in shell using upper spring seat 6, lower spring seat 5, baffle ring 7, and the sealing cover of valve stem 2 is attached to rubber sealing pad 3 to realize sealing function.The utility model spring press type pressure relief valve has the advantages of simple structure, low cost, stable low-pressure gas tightness etc., is suitable for multiple use environments.

Claims

1. A low pressure spring loaded pressure relief valve characterized by, The utility model relates to a valve body (1) one end of the valve body (1) is provided with a tapered round corner, the tapered round corner is used as the guide of valve stem (2), the end surface of valve body (1) is provided with sealing gasket groove; Valve stem (2) is arranged in the valve body (1), and one end of the valve stem is provided with a sealing cover; Rubber sealing gasket (3) is arranged in the sealing gasket groove;Wherein, the sealing cover and the rubber sealing gasket complete sealing; Wherein, further including spring;Wherein, the sealing cover has a tapered annular surface, and the tapered annular surface is pressed against the rubber sealing gasket (3) to complete sealing under the stretching action of spring (4); Further including upper spring seat and lower spring seat;Wherein, the spring is limited under the constraint action of upper spring seat (6) and lower spring seat (5); The upper spring seat (6) and the valve stem (2) are limited and fixed by the baffle ring (7). The valve body (1), the valve stem (2), the lower spring seat (5) and the upper spring seat (6) are all made of 20Cr13 stainless steel.

2. The low pressure spring loaded pressure relief valve of claim 1, wherein, The rubber sealing gasket (3) has a protruding part, and the protruding part is matched with the sealing gasket groove;The rubber sealing gasket is made of rubber 5171.

3. The low pressure spring loaded pressure relief valve of claim 2, wherein, ​

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