CN201141458Y

CN201141458Y - High-pressure low-temperature safety valve

Info

Publication number: CN201141458Y
Application number: CNU2007201863259U
Authority: CN
Inventors: 路兰卿; 张学军; 徐嫣; 滕磊军; 王晓军; 贺明; 赵桂民
Original assignee: Beijing Institute of Aerospace Testing Technology
Current assignee: Beijing Institute of Aerospace Testing Technology
Priority date: 2007-12-26
Filing date: 2007-12-26
Publication date: 2008-10-29
Anticipated expiration: 2017-12-26

Abstract

The utility model relates to a valve, in particular to a high-pressure low temperature safety valve. The valve comprises a valve body, a valve flap nested in the valve body and provided with one sealed end, a valve rod nested in the valve flap, and a hollow valve seat arranged at the lower part of the sealed end of the valve flap, wherein a hollow thread seat is arranged inside one end of the valve body; a hollow valve cap is covered outside the other end of the valve body, a thread gland is arranged between the valve flap and the valve body, a dummy club is arranged at the middle part of the valve rod, an adjusting screw rod is arranged between the valve rod and the valve cap, a spring seat is arranged between the inner end of the adjusting screw rod and the dummy club of the valve rod, a spring is arranged in the spring seat, and the valve rod is sealed in the valve cap through the valve bonnet; filling material is arranged between the end part of the thread gland, and the valve body, and a filling piece is arranged between the valve body and the valve cap. When the valve of the utility model works under high pressure and low temperature, the action of the valve rod is flexible, the response of the valve is agile, the opening pressure can be lowered to 1.02 to 1.05 times of the working pressure, and zero leakage is achieved.

Description

The high pressure low temperature safety valve

Technical field

The utility model belongs to a kind of valve, is specifically related to a kind of safety valve.

Background technique

The high pressure low temperature safety valve is the safety features that is applied to airspace engine high pressure low temperature pilot system, and its effect is equivalent to the pilot valve of Pilot operated safety valve.Safety valve is opened automatically when the high-pressure bottle superpressure in the pilot system, gives off specified medium, normally carries out with protection test safety.And used safety valve leaks more serious under high pressure and cold service at present, exist in test the danger that main valve is opened, test for the pressure requirement relatively stricter simultaneously, it is approaching to require working pressure and cracking pressure to try one's best in the test, does not also allow to keep by the mode that continues supercharging the pressure of container.Characteristics of airspace engine pilot system used medium are high pressure low temperatures, another characteristics are inflammable poisonous, should arrange so require safety valve to open the back medium, and leak sealing to guarantee the flap motion time at valve internal when not allowing to discharge to the appointed place.

The safety valve seal form of using in system at present is the plane soft seal, and the adjusting function of valve rod centering is poor, and valve leaks serious at the low-temperature working state.

In the patent No. is during 98232012.4 patent is described, and illustrate that this safety valve application protects the cycle of higher pressure system in oil drilling, and its application of temperature is a normal temperature, on function more as rupture disk.

In the patent No. is in the patent description of 200620115534.X, illustrates that this safety valve is a kind of high-pressure polyethylene device high-pressure safety valve that is applied to, and the sealability of this valve is only near zero leakage.

Summary of the invention

The purpose of this utility model is to provide a kind of seal request of suitable airspace engine high pressure low temperature pilot system, and makes the cracking pressure of safety valve and the high pressure low temperature safety valve that working pressure is close as far as possible.

Realize the technological scheme of the utility model purpose: a kind of high pressure low temperature safety valve, it comprises valve body, be enclosed within the end sealing in the valve body flap, be enclosed within the valve rod in the flap and be located at the valve seat of the hollow of flap closed end bottom, wherein, an end inside of valve body is provided with the threaded block of hollow; The other end of valve body is with the valve gap of hollow outward, be provided with union (screwed)bonnet (UB between flap and the valve body, the middle part of valve rod is provided with boss, be provided with adjusting screw rod between valve rod and the valve gap, be provided with spring seat between the inner of adjusting screw rod and the boss of valve rod, be provided with spring in the spring seat, bonnet with valve stem seal in valve gap; Be provided with filler between the end of union (screwed)bonnet (UB and the valve body, be provided with pad between valve body and the valve gap.

The beneficial effects of the utility model are: be sphere between valve rod and spring seat, the flap and cooperate, make 3 of valve rods stressed, therefore the flap that cooperates with the valve rod sphere is stressed evenly, no bite phenomenon between flap and valve body and valve rod and other parts in contact, thereby make valve in high pressure low temperature (liquid oxygen-183 ℃, liquid nitrogen-196 ℃, liquid hydrogen-253 ℃) flexible movements during work down, cone match between flap and the valve seat, make cracking pressure can be low to moderate 1.02～1.05 times of working pressure, even the cracking pressure of this safety valve and working pressure are close.

Description of drawings

Fig. 1 is the structural representation of a kind of high pressure low temperature safety valve provided by the utility model.

Among the figure: 1. threaded block; 2. valve seat; 3. valve body; 4. flap; 5. valve rod; 6. valve gap; 7. pad; 8. spring; 9. spring seat; 10. adjusting screw rod; 11. bonnet; 12. union (screwed)bonnet (UB; 13. filler.

Embodiment

The utility model is described in further detail below in conjunction with drawings and Examples:

As shown in Figure 1, a kind of high pressure low temperature safety valve, it comprises valve body 3, be enclosed within the ends sealing in the valve body 3 flap 4, be enclosed within the valve rod 5 in the flap 4 and be located at the valve seat 2 of the hollow of flap 4 closed end bottoms, its kind, an end inside of valve body 3 is provided with the threaded block 1 of hollow; The other end of valve body 3 is with the valve gap 6 of hollow outward, be provided with union (screwed)bonnet (UB 12 between flap 4 and the valve body 3, the middle part of valve rod 5 is provided with boss, be provided with adjusting screw rod 10 between valve rod 5 and the valve gap 6, be provided with spring seat 9 between the boss of the inner of adjusting screw rod 10 and valve rod 5, be provided with spring 8 in the spring seat 9, bonnet 11 is sealed in valve rod 5 in the valve gap 6; Be provided with filler 13 between the end of union (screwed)bonnet (UB 12 and the valve body 3, be provided with pad 7 between valve body 3 and the valve gap 6.

In the present embodiment, for sphere cooperates, be cone match between flap 4 and the valve seat 2 between valve rod 5 and the flap 4, sphere cooperates between the conical surface of spring seat 9 boss and the valve rod 5; Flap 4 bottoms are provided with boss, and flap 4 is contacted with valve body 3, realize that medium does not leak.

Valve body 3 and threaded block 1 adopt and are threaded, the pretension threaded block can compress valve seat 2, lead sealing after debugging is finished is taked this structure to make and all need do not changed threaded block 1 when changing valve seat construction form or material, can also reach the purpose of regulating the flap stroke by the mode of changing pad.Union (screwed)bonnet (UB 12 makes with being threaded of valve body 3 can compress the sealing that filler 13 is realized flap 4 by pretension union (screwed)bonnet (UB 12.Being cone match between valve rod 5 and the flap 4, is cone match between flap 4 and the valve seat 2, between the conical surface of spring seat 9 boss and the valve rod 5 sphere cooperate realize valve rod stressed to neutrality, improve the stressed uniformity of sealing surface.

Flap 4 adopts the conical surface sealing with valve seat 2, and flap 4 adopts brass (H62), and valve seat 2 adopts stainless steel (0Cr18Ni9).In order to guarantee zero leakage, the critical size tolerance of all component is not less than 7～8 grades, and form and position tolerance is not less than 7～9 grades, and the form and position tolerance at sealing surface place is not less than 4～6 grades.Flap 4 stressed uniformities guarantee that by 3 three stressed automatic centering structures of valve rod the filler 13 between valve body 3 and the flap 4 is guaranteed the sealing of flap 4.Adopted cone seal between flap 4 and the valve seat 2, sealing surface should grind, two sealing surfaces correct grinding after the corase grind, adopt during correct grinding two sealing surfaces to the mill mode.This high pressure low temperature safety valve is a Fall lift safety valve, and the valve stroke size can realize by the spacer thickness of adjusting between valve seat 2 and the valve body 3.

The working procedure of high pressure low temperature safety valve provided by the utility model: dielectric gas is entered by a mouth, promotes flap 4, valve rod 5 pressure spring 8 that moves upward under the promotion of medium power, makes valve opening, and dielectric gas is flowed out by the b mouth.In this process, the pressure in the valve body 3 rise, and behind valve opening, flap 4 moves upward, and it is gone up sealing surface and contacts with the boss of valve rod 5, the effect of medium power press down tight front cover realization valve on seal.Because the top of flap 4 is provided with union (screwed)bonnet (UB 12 and filler 13, make the sealing that realizes flap 4 when valve does not have complete opening in unlatching.

When the pressure at dielectric gas import a mouth place dropped to Reseating pressure of a safety valve, flap 4 moved downward the c mouth and opens, and gas is discharged from the c mouth, valve closing.

Claims

1. high pressure low temperature safety valve, it comprises valve body (3), be enclosed within the end sealing in the valve body (3) flap (4), be enclosed within the valve rod (5) in the flap (4) and be located at the valve seat (2) of the hollow of flap (4) closed end bottom, it is characterized in that: an end inside of valve body (3) is provided with the threaded block (1) of hollow; The other end of valve body (3) is with the valve gap (6) of hollow outward, be provided with union (screwed)bonnet (UB (12) between flap (4) and the valve body (3), the middle part of valve rod (5) is provided with boss, be provided with adjusting screw rod (10) between valve rod (5) and the valve gap (6), be provided with spring seat (9) between the boss of the inner of adjusting screw rod (10) and valve rod (5), be provided with spring (8) in the spring seat (9), bonnet (11) is sealed in valve rod (5) in the valve gap (6); Be provided with filler (13) between the end of union (screwed)bonnet (UB (12) and the valve body (3), be provided with pad (7) between valve body (3) and the valve gap (6).

2. a kind of high pressure low temperature safety valve according to claim 1, it is characterized in that: cooperate for sphere between described valve rod (5) and the flap (4), between flap (4) and the valve seat (2) is cone match, and sphere cooperates between the conical surface of spring seat (9) boss and the valve rod (5); Flap (4) bottom is provided with boss, and flap (4) is contacted with valve body (3), realizes that medium does not leak.