CN210397722U

CN210397722U - Quick pressure reduction control valve

Info

Publication number: CN210397722U
Application number: CN201920847855.6U
Authority: CN
Inventors: 冯岚
Original assignee: Utmost Flow Control Tech Beijing Co ltd
Current assignee: Utmost Flow Control Tech Beijing Co ltd
Priority date: 2019-06-05
Filing date: 2019-06-05
Publication date: 2020-04-24
Anticipated expiration: 2029-06-05

Abstract

A rapid pressure reduction control valve comprises a valve rod, a valve body, an oil injector, a packing gland, a bolt, a nut, an O-shaped ring, a lantern sleeve, packing, a packing base gasket and a sealing ring; the rapid pressure reduction control valve further comprises a pressure reduction stabilizing part arranged inside the valve body, and the pressure reduction stabilizing part comprises a sealing wing, a valve core assembly, a sealing body, a sealing seat, a sealing nut, a blocking body, a sliding gap and an elastic component. Through the three-level sealing effect of the interference seal of the O-shaped ring, the seal of the filler and the elastic seal of the sealing ring, the leakage of sealing substances is greatly reduced, the stability of the pressure reduction stabilizing part is set, the valve rod is kept stable during movement, and the unstable problem caused by left-right swinging under the pressure impact condition is avoided.

Description

Quick pressure reduction control valve

Technical Field

The utility model relates to a control valve equipment technical field specifically is a quick pressure reduction control valve.

Background

In recent years, with the development of material science and technology and mechanical science and technology, the domestic valve industry is also advancing, and the product structure types of various valve enterprises are also in the future. However, the existing regulating valve in China is still lack of safety, firstly, the regulating valve is limited by the used materials, and secondly, the sealing technology and the structure have self limitations, especially at the position of filler sealing. In the field, the filler is generally made of polytetrafluoroethylene or flexible graphite and forms dynamic seal with a valve rod, but the obvious dynamic seal has no one hundred percent of safety, especially when the valve is used for a period of time, the friction between the valve rod and the filler can abrade a part of the filler, the valve is easy to leak, and the expected sealing effect can not be achieved even if the filler is pre-tightened; in addition, when the pressure of the valve suddenly rises, the packing can also cause leakage, for example, the friction force between the valve rod and the packing can be greatly increased by pre-tightening the packing, so that the thrust of an actuating mechanism is not enough or the dead zone of the valve is increased, and the using effect of the valve is influenced. In conclusion, the two situations are temporary remedial measures after the valve is found to be leaked, namely, the valve is leaked, and when the medium is the valuable fluid, direct economic loss of enterprises can be caused; when the medium is toxic or flammable and explosive, casualties or explosions can be caused, and even more serious consequences can be caused. At present, the sealing requirement of an oxygen regulating valve on a filler is very strict, any leakage is not allowed when the oxygen regulating valve is operated, once the leakage hazard of oxygen is very large, oxygen content measuring devices in air are arranged around the regulating valve, once the oxygen leaks from the filler to cause alarm starting, the alarm starting can directly cause the shutdown of the whole equipment, so that serious consequences are caused, and the loss is very large for enterprise production. Therefore, a criterion must be followed during the production and manufacture of such valves: can stably and safely operate in one overhaul period.

However, the key to leakage is the presence of fillers, which may lack lubricity over time. When the valve rod moves up and down, the packing is pressed by large pressing force, so that the packing tightly embraces the valve rod to achieve the sealing effect, but the packing has large friction force after the lubrication fails, so that the sealing fails. The method for solving the problem on site only continuously adds pretightening force to the filler to enhance the sealing effect, but only temporarily solves the problem of leakage, and has the side effects that the valve rod is crawled and cannot be adjusted, and the dynamic pressure adjusting effect is lost; another method is to continue to add filler, but this also only seals temporarily, with large fluctuations in adjustment. In summary, one of the technical problems that needs to be urgently solved by those skilled in the art is: how to make the dynamic sealing system more stable and safer.

In another patent (CN208348600U) of the applicant, a pilot-operated type regulating valve is disclosed, which includes a valve rod, a valve cover, and a valve body, wherein the valve rod is movably installed in the center of the valve cover, an inflow chamber and an outflow chamber separated by an S-shaped partition are provided in the valve body, a valve cage is provided in the inflow chamber below the valve cover, the valve cage is provided on a platform in the middle of the S-shaped partition, a coaxial pilot-operated type valve core assembly is further provided in the valve cage, and the pilot-operated type valve core assembly is connected with the valve rod and is driven by the valve rod to move to communicate the inflow chamber and the outflow chamber. The lower part lateral wall of valve cage is equipped with the orifice that a plurality of circumference distribute, and the lower part of case subassembly also is equipped with the case hole that a plurality of circumference distribute, the utility model discloses a pilot-operated type governing valve not only can realize the large-traffic pressure release under the high temperature high pressure operating mode, can adjust the velocity of flow that fluid medium passed in and out the case simultaneously, protects sealed face to satisfy the sealed requirement of V level under special operating mode. But the valve rod that is located the centre directly drives the case, so under the impact of accepting high temperature high pressure medium, probably have slight skew, lead to the left and right rocking of valve rod to lead to interior hourglass to take place, consequently, this application improves based on above-mentioned technical problem, solves the stable safe end problem of dynamic seal system that exists among the prior art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a rapid pressure reduction control valve to solve the problem that proposes among the above-mentioned background art.

A rapid pressure reduction control valve comprises a valve rod 1, a valve body 2, an oil injector 3, a packing gland 4, a bolt 5, a nut 6, an O-shaped ring 7, a lantern sleeve 8, packing 9, a packing base gasket 10 and a sealing ring 11; the packing gland 4 comprises an upper part 41 and a lower part 42, wherein the upper part 41 is screwed and pressed through a bolt 5, a nut 6 and the valve body 2; the valve body 2 is provided with an inner groove 21 for inserting the valve rod 1, the lower part 42, the lantern sleeve 8, the packing 9, the packing bottom pad 10 and the sealing ring 11, the outer circumferential surface of the lower portion 42 has an annular groove 43. the annular groove 43 is inserted into the O-ring 7 in an interference manner, and after the O-ring 7 is inserted into the annular groove 43, closely contacts with the inner groove of the valve body 2, the lower part 42 of the packing gland 4 is inserted into the valve body 2, the packing 9 is pressed downwards after the screwing and the pressing, the stuffing 9 comprises an upper stuffing group 91 and a lower stuffing group 92, the upper stuffing group 91 and the lower stuffing group 92 are isolated by the lantern sleeve 8, the oil ejector 3 is connected with the lantern sleeve 8, the lower part of the lower stuffing set 92 is provided with the stuffing bottom pad 10, the packing bottom pad 10 supports the packing 9, a sealing ring 11 is arranged below the packing bottom pad 10, and the sealing ring 11 is arranged on a protruding platform 12 of an inner groove of the valve body 2.

The quick pressure reduction control valve further comprises a pressure reduction stabilizing part A arranged inside the valve body 2, wherein the pressure reduction stabilizing part A comprises a sealing wing A1, a valve core assembly A2, a sealing body A3, a sealing seat A4, a sealing nut A5, a baffle body A6, a sliding gap A7 and an elastic component A8; the valve rod 1 is provided with a sealing wing A1, a sealing body A3 and a sealing seat A4, the sealing wing A1 and the sealing body A3 are arranged in a split mode, the sealing body A3 is matched with the valve body 2, and the middle of the sealing body A3 is provided with a valve core assembly A2; the valve core assembly A2 is matched with the sealing wing A1, the valve rod 1 below the sealing wing A1 is provided with the valve core assembly A2, the sealing seat A4 is arranged below the valve core assembly A2, and the valve sealing seat A4 is matched with the valve rod 1 to drive the sealing body A3 to move relative to the valve body 2.

Further, the sealing body A3 is of a circular groove type with a downward opening, and the central area of the circular groove type is of a hollow structure and serves as an accommodating position of the valve core assembly A2; the sealing wing A1 is arranged above the hollow structure and fixed with the valve rod 1, and the sealing wing A1 is matched with the hollow structure to form a starting valve which can be opened in advance before being opened relative to the sealing body A3; the valve core assembly A2 is installed below the sealing wing A1, the sealing nut A5 is installed at the end of the valve rod 1, the sealing seat A4 and the elastic component A8 are installed between the sealing nut A5 and the valve core assembly A2, and the sealing seat A4 is used for driving the sealing body A3 to move upwards along with the valve rod 1 after the sealing wing A1 is opened, so that media circulate, namely the valve is opened. The center of the sealing seat A4 is a bolt-shaped structure, the sealing nut A5 can be screwed to prevent the sealing nut A5 from falling off when being matched with the valve rod 1, and the elastic component A8 can give elastic buffering to the sealing seat A4 when moving. The valve core assembly A2 below the sealing wing A1 is the valve core structure of the pilot-operated type regulating valve.

Further, the elastic member A8 may be a spring or a sealing ring 11.

Further, the O-ring 7 is an O-ring for oxygen.

Further, the interference of the O-shaped ring 7 is 20-30 wires.

Further, the sealing ring 11 is an elastic energy storage sealing ring.

Optionally, the sealing ring 11 has a lip-shaped inner edge.

Further, the O-ring 7 and the sealing ring 11 are made of one of nitrile rubber, fluororubber, silicone rubber, ethylene propylene rubber, chloroprene rubber, butyl rubber, polytetrafluoroethylene and natural rubber, and the materials of the O-ring 7 and the sealing ring 11 are consistent and determined according to the material quality of the sealing substance.

Further, the diameter of the inner edge of the sealing ring 11 is the same as that of the valve rod 1, and after the sealing ring is compressed, deformation interference is generated to tightly contact the valve rod 1 so as to perform bubble-level sealing.

Further, the interference of the sealing ring 11 is preferably 30-40 wires, and the diameter of the section of the sealing ring 11 is determined by the interference and the system pressure.

Further, the lip thickness of the sealing ring 11 is 03-0.4 times of the section diameter of the sealing ring 11.

Alternatively, the seal ring 11 may be replaced by a high performance spring-loaded seal ring.

Further, the upper packing group 91 and the lower packing group 92 each include three packing materials.

Further, the oil ejector 3 is filled with lubricant, and the lubricant is injected into the lantern sleeve periodically.

Alternatively, the grease filler 3 is filled with grease-free lubricant for oxygen, which is periodically injected into the lantern envelope.

Further, in order to make the seal body A3 open smoothly, a gap 10 is provided between the seal body A3 and the valve body 2; the maximum flow area of the sealing wing A1 when opened is greater than or equal to 4 times of the flow cross section of the sliding gap A7, and is greater than 3 times of the area of the input port I and the output port O.

Further, a stopper a6 is provided at the lower part of the outer side of the seal body A3. The stopper A6 forms an outward bulge relative to the sealing body A3, so that the sealing body A3 can generate downward pressure in an opening state, the sealing body A3 cannot be separated from the sealing seat A4 all the time, and the problem caused by the swinging of the sealing body A3 under the movement is avoided. The stopper a6 is disposed at a lower position of the sliding gap a 7.

Compared with the prior art, the utility model, have following advantage:

1. the utility model discloses can be applicable to various sealing system, including liquid and gas etc. select for use different sealing washer materials according to the material of difference and can realize, change simple and convenient easy-to-use.

2. Because the O-shaped ring of the system is used, the system has the advantages of low cost, good sealing property, wide application range, simple structure, self-sealing effect, sealing performance which can be achieved by only one sealing element, good sealing effect, unchanged sealing performance when the system is used for reciprocating sealing, less medium leakage amount, auxiliary sealing and prevention of external impurities.

3. The packing group containing three packing is arranged at the upper end and the lower end, so that the quantity of the packing is reduced, the friction force is reduced to the maximum extent, and the sealing of the valve rod part can be enhanced from the upper end and the lower end by arranging the lower packing group and the upper packing group.

4. The elastic high-performance energy storage sealing ring has two obvious positive effects, firstly, the sealing ring is pressed by pressure to deform, so that interference is generated to closely contact the valve rod to perform bubble-level sealing, leakage of sealed gas is greatly reduced, and the sealing effect of the bubble level is completely realized; secondly, after the valve is used for a period of time, a part of filler is abraded by friction between the valve rod and the filler, the leakage of the valve is easily caused, the production is delayed when the valve is maintained, the sealing ring compressed by the filler is deformed due to pressure so as to store sufficient energy, the support of the filler is provided in the form of elastic force, when the pretightening force of the filler is reduced, the energy-stored sealing ring provides continuous elastic force to continuously compress the filler, the pretightening force of the filler is kept in a sealing balance state, and the high-performance balance sealing ring effectively provides a sealing effect.

5. Lubricating oil is injected regularly through the oil injector, so that lubrication of the two groups of fillers is guaranteed, and the sealing effect is effectively improved.

6. Set up step-down stabilizer A on current case basis, set up through the stability of step-down stabilizer, made the valve rod keep stable when the motion, avoided receiving the unstable problem that the left and right sides under the pressure shock condition swayd and lead to.

In a word, through the interference seal of O type circle, the sealed of packing, the sealed tertiary sealing effect of elastic seal of sealing washer, greatly reduce revealing of sealing substance to avoid external impurity's entering, effectual sealed effect that has improved makes the system of packing can exempt from the maintenance in a big maintenance cycle, and stable production, and guaranteed entire system's safety, can reduction in production cost, reduction maintenance cost. Stability through the steady portion that steps down sets up, makes the valve rod keep stable when the motion, avoids receiving the unstable problem that the left and right rocking under the pressure shock condition leads to.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a sectional view of the section of the step-down stabilizer

Wherein, the part names corresponding to the reference numbers are as follows:

1-valve stem, 2-valve body, 3-oil injector, 4-packing gland, 5-bolt, 6-nut, 7-O-shaped ring, 8-lantern sleeve, 9-packing, 10-packing base pad, 11-sealing ring, 12-protruding platform, 21-inner groove, 41-packing gland upper part, 42-packing gland lower part, 43-groove, 91-upper packing group, 92-lower packing group, I-input port, O-output port, A1-sealing wing, A2-valve core component, A3-sealing body, A4-sealing seat, A5-sealing nut, A6-baffle body, A7-sliding gap, A8-elastic component

Detailed Description

The present invention will be further explained with reference to the accompanying drawings:

as shown in fig. 1, a rapid pressure reduction control valve comprises a valve rod 1, a valve body 2, an oil injector 3, a packing gland 4, a bolt 5, a nut 6, an O-ring 7, a lantern sleeve 8, packing 9, a packing base gasket 10 and a sealing ring 11; the packing gland 4 comprises an upper part 41 and a lower part 42, wherein the upper part 41 is screwed and pressed through a bolt 5, a nut 6 and the valve body 2; the valve body 2 is provided with an inner groove 21 for inserting the valve rod 1, the lower part 42, the lantern sleeve 8, the packing 9, the packing bottom pad 10 and the sealing ring 11, the outer circumferential surface of the lower portion 42 has an annular groove 43. the annular groove 43 is inserted into the O-ring 7 in an interference manner, and after the O-ring 7 is inserted into the annular groove 43, closely contacts with the inner groove of the valve body 2, the lower part 42 of the packing gland 4 is inserted into the valve body 2, the packing 9 is pressed downwards after the screwing and the pressing, the stuffing 9 comprises an upper stuffing group 91 and a lower stuffing group 92, the upper stuffing group 91 and the lower stuffing group 92 are isolated by the lantern sleeve 8, the oil ejector 3 is connected with the lantern sleeve 8, the lower part of the lower stuffing set 92 is provided with the stuffing bottom pad 10, the packing bottom pad 10 supports the packing 9, a sealing ring 11 is arranged below the packing bottom pad 10, and the sealing ring 11 is arranged on a protruding platform 12 of an inner groove of the valve body 2.

Further, the elastic member A8 may be a spring or a sealing ring 11.

Preferably, the O-ring 7 is an O-ring for oxygen.

Preferably, the interference of the O-shaped ring 7 is 20-30 wires.

Preferably, the sealing ring 11 is an elastic energy storage sealing ring.

Optionally, the sealing ring 11 has an inner circle with a lip shape.

Preferably, the O-ring 7 and the sealing ring 11 are made of one of nitrile rubber, fluororubber, silicone rubber, ethylene propylene rubber, chloroprene rubber, butyl rubber, polytetrafluoroethylene, and natural rubber, and the materials of the O-ring 7 and the sealing ring 11 are the same and determined according to the material of the sealing substance.

Preferably, the diameter of the inner circle of the sealing ring 11 is the same as that of the valve rod 1, and after the sealing ring is compressed, deformation interference is generated so as to tightly contact the valve rod 1 to perform bubble-level sealing.

Preferably, the interference of the sealing ring 11 is 30-40 wires, and the diameter of the section of the sealing ring 11 is determined by the interference and the system pressure.

Preferably, the lip thickness of the sealing ring 11 is 03-0.4 times the diameter of the section of the sealing ring 11.

Alternatively, the seal ring 11 may be replaced by a high performance spring-loaded seal ring. The packing bottom pad 2 below is provided with high performance spring energy storage sealing washer (1), and system pressure can assist the spring energy storage, and pressure is big more, and the sealing lip is more abundant with the laminating of slot, forms high-pressure seal from this.

Preferably, the upper packing group 91 and the lower packing group 92 each include three packing materials.

Preferably, the oil injector 3 is filled with lubricant, which is periodically injected into the lantern envelope. The lubricating agent is brought into the filler in the process of the up-and-down movement of the valve rod, so that the lubrication of the valve rod is ensured, and the phenomenon that the valve rod creeps due to the large friction generated by the pretightening force of the filler is avoided, so that the adjustment cannot be performed. The lantern sleeve is regularly filled with the lubricant, so that the filling system of the oxygen valve is free from maintenance in a large overhaul period.

Compared with the prior art, the utility model, have following advantage:

The utility model discloses an implementation method does: connect gland and valve body together through bolt and nut, after connecting fixedly, gland's lower part only pushes down the filler, and upper and lower packing group separates through the lantern cover, at this moment, the energy storage sealing washer of bottommost produces deformation because of receiving pressure, deformation leads to two effects, circle lip shape sealing washer in close contact with valve rod in it, on the other hand, its elastic energy storage can provide continuous pressure for the pretightning force of filler, thereby avoid the reduction of the packing pretightning force that leads to because the continuous motion of valve rod, keep the leakproofness of entire system, after lasting a production cycle, when maintaining, adjust again and can reuse.

The interference of the sealing ring 11 is preferably 30-40 threads, and the diameter of the section of the sealing ring 11 is determined by the interference and the system pressure. For the calculation of the cross-sectional diameter, the following method is used:

for dynamic sealing, the continuous reciprocating motion of the valve rod can cause the loss of the sealing ring, and the maximum loss l allowed by the sealing ring_lostThe maximum loss l_lostThe value is 30-40 filaments; this loss is related to the amount of compression of the seal ring, which is

Wherein

D is the cross-sectional diameter of the seal ring for its inherent compressibility. Obviously, the larger the inherent compressibility of the material of the sealing ring, the stronger the elastic deformation capability of the material, but the more easily the material is lost, the easily damaged sealing ring is damaged due to the reciprocating motion of the valve rod, and the sealing ring which is easily damaged is obviously not suitable for the dynamic sealing environment. The calculation of the cross-sectional diameter D depends on the interference determined together with the system pressure. The inner diameter of the sealing ring has a lip with a thickness of 0.3-0.4 times the diameter of the cross section of the sealing ring.

The pressure reduction stabilizing part A of the utility model only needs to be pulled up through the valve rod 1 when the valve is opened, and the pressure difference between two sides of the sealing body A3 is reduced or disappears because of the pressure reduction of the valve core component by high-pressure media such as gas and the like; when closed, the seal body A3 closes first, and then the seal flap a1 will close the passage of the valve core assembly a 2. Once the sealing wing a1 is closed, the sealing wing a1 simultaneously blocks the channel for the leakage of the high-pressure medium under the action of the closing force in the same stress direction. Thus, in the moment of opening, the utility model discloses a cooperation of case subassembly A2 and sealing wing A1, sealing body A3 has just balanced the impact of high-pressure medium, has stabilized the motion of valve rod 1.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification.

Claims

1. A rapid pressure drop control valve characterized by: the oil filling device comprises a valve rod (1), a valve body (2), an oil injector (3), a packing gland (4), a bolt (5), a nut (6), an O-shaped ring (7), a lantern sleeve (8), packing (9), a packing base gasket (10) and a sealing ring (11); the packing gland (4) comprises an upper part (41) and a lower part (42), wherein the upper part (41) is screwed and compressed through a bolt (5), a nut (6) and the valve body (2); the valve body (2) is provided with an inner groove (21) for inserting the valve rod (1), a lower part (42), the lantern sleeve (8), the packing (9), a packing bottom pad (10) and a sealing ring (11), wherein the outer circle surface of the lower part (42) is provided with an annular groove (43), the annular groove (43) is embedded into an O-shaped ring (7) in an interference manner, the O-shaped ring (7) is embedded into the annular groove (43) and is in tight contact with the inner groove of the valve body (2), the lower part (42) of the packing gland (4) is inserted into the valve body (2), the packing (9) is pressed down after being screwed and compressed, the packing (9) comprises an upper packing group (91) and a lower packing group (92), the upper packing group (91) and the lower packing group (92) are isolated through the lantern sleeve (8), the oil injector (3) is connected with the lantern sleeve (8), and the packing bottom pad (10) is arranged at the, the packing bottom pad (10) supports the packing (9), a sealing ring (11) is arranged below the packing bottom pad (10), and the sealing ring (11) is arranged on a protruding platform (12) of an inner groove of the valve body (2);

the quick pressure reduction control valve further comprises a pressure reduction stabilizing part (A) arranged inside the valve body (2), wherein the pressure reduction stabilizing part (A) comprises a sealing wing (A1), a valve core assembly (A2), a sealing body (A3), a sealing seat (A4), a sealing nut (A5), a blocking body (A6), a sliding gap (A7) and an elastic component (A8); the valve rod (1) is provided with a sealing wing (A1), a sealing body (A3) and a sealing seat (A4), the sealing wing (A1) and the sealing body (A3) are arranged in a split mode, the sealing body (A3) is matched with the valve body (2), and the middle of the sealing body (A3) is provided with a valve core assembly (A2); the valve core assembly (A2) is matched with the sealing wing (A1), the valve core assembly (A2) is installed on the valve rod (1) below the sealing wing (A1), the sealing seat (A4) is arranged below the valve core assembly (A2), and the sealing seat (A4) can drive the sealing body (A3) to move relative to the valve body (2) by being matched with the valve rod (1).

2. The rapid pressure reduction control valve according to claim 1, wherein the sealing body (A3) is of a downwardly open circular groove type, and a central region of the circular groove type is of a hollow structure as a receiving position of the valve core assembly (a 2); the sealing wing (A1) is arranged above the hollow structure and fixed with the valve rod (1), and the sealing wing (A1) is matched with the hollow structure to form a starting valve which can be opened in advance before the sealing body (A3) is opened; a valve core assembly (A2) is arranged below the sealing wing (A1), a sealing nut (A5) is arranged at the end part of the valve rod (1), a sealing seat (A4) and an elastic component (A8) are arranged between the sealing nut (A5) and the valve core assembly (A2), and the sealing seat (A4) is used for driving the sealing body (A3) to move upwards along with the valve rod (1) after the sealing wing (A1) is opened so as to enable a medium to circulate; the center of the sealing seat (A4) is in a bolt-shaped structure, and the sealing nut (A5) is screwed; the valve core assembly (A2) below the sealing wing (A1) is the valve core structure of the pilot-operated type regulating valve.

3. The rapid decompression control valve according to claim 1, characterized in that the O-ring (7) is an O-ring for oxygen; the interference magnitude of the O-shaped ring (7) is 20-30 threads.

4. The rapid pressure reduction control valve according to claim 1, characterized in that the lower part of the outer side of the sealing body (A3) is provided with a stopper body (a 6); the baffle body (A6) forms an outward bulge relative to the sealing body (A3), so that the sealing body (A3) can generate downward pressure in an opening state, and the sealing body (A3) can not be separated from the sealing seat (A4) all the time; the stopper (A6) is disposed at a lower position of the sliding gap (A7).

5. The rapid pressure reduction control valve according to claim 1, wherein the O-ring (7) and the sealing ring (11) are made of one of nitrile rubber, fluorine rubber, silicon rubber, ethylene propylene rubber, chloroprene rubber, butyl rubber, polytetrafluoroethylene and natural rubber, and the O-ring (7) and the sealing ring (11) are made of the same material and determined according to the material of the sealing substance.

6. The rapid pressure reduction control valve according to claim 1, characterized in that the sealing ring (11) is an elastic energy storage sealing ring having a lip-shaped inner edge; the diameter of the inner edge of the sealing ring (11) is the same as that of the valve rod (1), and after the sealing ring is compressed, deformation interference can be generated to tightly contact the valve rod (1) to perform bubble-level sealing.

7. The rapid pressure reduction control valve according to claim 1, characterized in that the interference of the sealing ring (11) is 30-40 wires, and the cross-sectional diameter of the sealing ring (11) is determined by the interference together with the system pressure.

8. The rapid decompression control valve according to claim 1, wherein the lip thickness of the sealing ring (11) is 03-0.4 times the diameter of the cross section of the sealing ring (11).

9. A rapid pressure reducing control valve according to claim 1, characterized in that the sealing ring (11) can be replaced by a high performance spring-loaded sealing ring.

10. The rapid pressure reduction control valve of claim 1, characterized in that the upper packing set (91), the lower packing set (92) each include three packings.