A fast pressure reduction control valve

Abstract

A rapid pressure reduction control valve includes a valve stem, valve body, lubricator, packing gland, bolts, nuts, O-rings, lantern sleeves, packing, packing base gaskets, and sealing rings. The valve also includes a pressure-reducing stabilizing section disposed within the valve body. This stabilizing section comprises a sealing wing, valve core assembly, sealing body, sealing seat, sealing nut, stop, sliding clearance, and elastic components. Through the three-stage sealing effect of the O-ring's interference seal, the packing seal, and the sealing ring's elastic seal, leakage of sealing material is greatly reduced. The stability setting of the pressure-reducing stabilizing section ensures the valve stem remains stable during movement, avoiding instability caused by lateral swaying under pressure shocks.

Description

Technical Field

[0001] This invention relates to the field of control valve equipment technology, specifically a rapid pressure reduction control valve. Background Technology

[0002] In recent years, with the development of materials science and mechanical technology, the domestic valve industry has been making continuous progress, and various valve companies have introduced a wide variety of product structures. However, existing domestic control valves still have shortcomings in terms of safety. This is due to two main limitations: firstly, the materials used, and secondly, the inherent limitations of sealing technology and structure, especially at the packing seal. In this field, the packing material is generally polytetrafluoroethylene (PTFE) or flexible graphite, forming a dynamic seal with the valve stem. However, a dynamic seal is not 100% safe. Especially after the valve has been used for a period of time, friction between the valve stem and the packing will wear down some of the packing, easily leading to valve leakage. Even pre-tightening the packing cannot achieve the expected sealing effect. Furthermore, a sudden increase in valve pressure can also cause leakage at the packing. Pre-tightening the packing will greatly increase the friction between the valve stem and the packing, directly resulting in insufficient thrust of the actuator or an increase in the valve dead zone, affecting the valve's performance. In summary, both of these situations are temporary remedial measures after a valve leak has been discovered. If the leak has already occurred, and the medium is a valuable fluid, it will cause direct economic losses to the company; if the medium is toxic, flammable, or explosive, it will cause personal injury or explosion, or even more serious consequences. Currently, oxygen regulating valves have extremely stringent requirements for the sealing of the packing material, demanding that there be no leakage during operation. Oxygen leakage is extremely dangerous; therefore, these regulating valves are equipped with oxygen content measurement devices around them. If oxygen leaks from the packing material, triggering an alarm, it will directly shut down the entire equipment, leading to serious consequences and significant losses for the company's production. Therefore, the manufacturing of these valves must adhere to one principle: stable and safe operation within a single maintenance cycle.

[0003] However, the key to external leakage lies in the packing. After prolonged use, the packing loses its lubrication. During the valve stem's up-and-down movement, the significant clamping force presses down on the packing, causing it to tightly grip the valve stem for a seal. However, with lubrication failing, the packing exhibits high friction, leading to seal failure. On-site solutions often involve increasing the packing preload to enhance the seal, but this only temporarily resolves the external leakage and results in the valve stem creep becoming unadjustable, losing its dynamic pressure regulation function. Another method is to add more packing, but this also only provides a temporary seal, leading to significant fluctuations during adjustment. In short, a pressing technical problem that requires expertise is how to make the dynamic sealing system more stable and safe.

[0004] In another patent of the applicant (CN208348600U), a pilot-operated regulating valve is disclosed. This pilot-operated regulating valve includes a valve stem, a valve cover, and a valve body. The valve stem is movably mounted at the center of the valve cover. The valve body has an inflow chamber and an outflow chamber separated by an S-shaped partition. A valve cage is provided in the inflow chamber below the valve cover, and the valve cage is set on a platform in the middle of the S-shaped partition. A coaxial pilot-operated valve core assembly is also provided inside the valve cage. The pilot-operated valve core assembly is connected to the valve stem and moves under the action of the valve stem, connecting the inflow chamber and the outflow chamber. The lower side wall of the valve cage has multiple circumferentially distributed throttling holes, and the lower part of the valve core assembly also has multiple circumferentially distributed valve core holes. The pilot-operated regulating valve of this invention can not only achieve large-flow pressure relief under high-temperature and high-pressure conditions, but also regulate the flow rate of the fluid medium entering and exiting the valve core, protecting the sealing surface, thereby meeting the Class V sealing requirements under special operating conditions. However, the valve stem, located in the middle, directly drives the valve core. Therefore, under the impact of high temperature and high pressure media, it may slightly deviate, causing the valve stem to swing left and right, resulting in internal leakage. Therefore, this application improves upon the above-mentioned technical problem to solve the problem of stable and safe termination of the dynamic sealing system in the prior art. Summary of the Invention

[0005] The purpose of this invention is to provide a rapid pressure reduction control valve to solve the problems mentioned in the background art.

[0006] A rapid pressure reduction control valve includes a valve stem 1, a valve body 2, an oil injector 3, a packing gland 4, bolts 5, nuts 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 includes an upper portion 41 and a lower portion 42. The upper portion 41 is tightened to the valve body 2 by bolts 5 and nuts 6. The valve body 2 has an inner groove 21 for inserting the valve stem 1, the lower portion 42 of the packing gland 42, the lantern sleeve 8, the packing 9, the packing base gasket 10, and the sealing ring 11. The outer surface of the lower portion 42 of the packing gland has an annular groove 43. After the O-ring 7 is interference-fitted into the annular groove 43, it is in close 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, and after being screwed and tightened, it presses the packing 9 downward. The packing 9 includes an upper packing group 91 and a lower packing group 92. The upper packing group 91 and the lower packing group 92 are separated by a lantern sleeve 8. The oil injector 3 is connected to the lantern sleeve 8. A packing base pad 10 is placed at the lower part of the lower packing group 92. The packing base pad 10 supports the packing 9. A sealing ring 11 is set below the packing base pad 10. The sealing ring 11 is set on the protruding platform 12 of the inner groove of the valve body 2.

[0007] The rapid pressure reduction control valve also includes a pressure reduction stabilizing part A disposed inside the valve body 2. The pressure reduction stabilizing part A includes a sealing wing A1, a valve core assembly A2, a sealing body A3, a sealing seat A4, a sealing nut A5, a stop body A6, a gap A7, and an elastic component A8. The sealing wing A1, the sealing body A3, and the sealing seat A4 are installed on the valve stem 1. The sealing wing A1 and the sealing body A3 are separately disposed. The sealing body A3 cooperates with the valve body 2. The valve core assembly A2 is disposed in the middle of the sealing body A3. The valve core assembly A2 cooperates with the sealing wing A1. The valve core assembly A2 is installed on the valve stem 1 below the sealing wing A1. The sealing seat A4 is disposed below the valve core assembly A2. The sealing seat A4 cooperates with the valve stem 1 and can drive the sealing body A3 to move relative to the valve body 2.

[0008] Furthermore, the sealing body A3 has a downward-opening circular groove structure, with a hollow central area serving as the housing for the valve core assembly A2. The sealing wing A1 is positioned above the hollow structure and fixed to the valve stem 1. The sealing wing A1, in conjunction with the hollow structure, forms an openable valve relative to the sealing body A3. The valve core assembly A2 is installed below the sealing wing A1, and a sealing nut A5 is installed at the end of the valve stem 1. A sealing seat A4 and an elastic component A8 are installed between the sealing nut A5 and the valve core assembly A2. The sealing seat A4, when the sealing wing A1 is opened, drives the sealing body A3 to move upwards along with the valve stem 1, allowing media flow and thus opening the valve. The sealing seat A4 has a bolt-like structure at its center, and the sealing nut A5 can be screwed on to prevent it from falling off when engaged with the valve stem 1. The elastic component A8 provides elastic cushioning during the movement of the sealing seat A4. Below the sealing wing A1, the valve core assembly A2, is the valve core structure of a pilot-operated control valve.

[0009] Furthermore, the elastic component A8 can be a spring or a sealing ring 11.

[0010] Furthermore, the O-ring 7 is an oxygen-use O-ring.

[0011] Furthermore, the interference fit of the O-ring 7 is 20-30 filaments.

[0012] Furthermore, the sealing ring 11 is an elastic energy storage sealing ring.

[0013] Optionally, the sealing ring 11 has a lip-shaped inner edge.

[0014] Furthermore, the materials of the O-ring 7 and the sealing ring 11 are 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, which is determined according to the material of the sealing substance.

[0015] Furthermore, the inner diameter of the sealing ring 11 is the same as the diameter of the valve stem 1. After being compressed, it will deform and interfere to make close contact with the valve stem 1 and perform bubble-level sealing.

[0016] Furthermore, the interference fit of the sealing ring 11 is preferably 30-40 mils, and the cross-sectional diameter of the sealing ring 11 is determined by both the interference fit and the system pressure.

[0017] Furthermore, the lip thickness of the sealing ring 11 is 0.3-0.4 times the cross-sectional diameter of the sealing ring 11.

[0018] Optionally, the sealing ring 11 can be replaced with a high-performance spring-loaded sealing ring.

[0019] Furthermore, each of the upper packing group 91 and the lower packing group 92 includes three packing materials.

[0020] Furthermore, the oiler 3 is filled with lubricant, which is periodically injected into the lantern sleeve.

[0021] Optionally, the lubricator 3 is filled with oxygen-free grease-free lubricant, and the lubricant is periodically injected into the lantern sleeve.

[0022] Furthermore, in order to ensure smooth opening of the sealing body A3, a gap 10 is provided between the sealing body A3 and the valve body 2; when the sealing wing A1 is opened, the maximum flow area is greater than or equal to more than 4 times the flow cross section of the gap A7, and more than 3 times the area of ​​the inlet I and the outlet O.

[0023] Furthermore, a stop A6 is provided on the lower outer side of the sealing body A3. This stop A6 protrudes outward relative to the sealing body A3, thus ensuring that the sealing body A3, when open, generates downward pressure, preventing it from detaching from the sealing seat A4 and avoiding problems caused by the sealing body A3 swaying during movement. The stop A6 is located below the gap A7.

[0024] Compared with the prior art, this invention patent has the following advantages:

[0025] 1. This invention is applicable to various sealing systems, including liquids and gases. Different sealing ring materials can be selected according to different materials, and replacement is simple and easy.

[0026] 2. Due to the use of O-rings in this system, the cost is low, the sealing performance is good, the application range is wide, and the structure is simple with a self-sealing function. Often, only one sealing element is needed to complete the sealing. The sealing effect is good. When used for reciprocating motion sealing, its sealing performance remains unchanged and the leakage of the medium is very small. It can both provide auxiliary sealing and prevent external impurities from entering.

[0027] 3. By setting up packing assemblies containing three packings at both the upper and lower ends, the number of packings is reduced while minimizing friction. The lower and upper packing assemblies can enhance the sealing of the valve stem from both the upper and lower ends.

[0028] 4. The use of a high-performance, elastic energy-storing sealing ring has two significant positive effects. First, by compressing the sealing ring under pressure, it deforms, creating an interference fit to tightly contact the valve stem, achieving a bubble-level seal. This greatly reduces leakage in the event of gas leaks, fully realizing a bubble-level sealing effect. Second, after the valve has been in use for a period of time, friction between the valve stem and the packing can wear down some of the packing, easily leading to valve leakage. Repairing at this point would delay production. However, the sealing ring, after being compressed by the packing, deforms under pressure, storing sufficient energy. This energy-storing seal supports the packing through elastic force. When the packing preload decreases, the energy-storing sealing ring provides continuous elastic force to continuously compress the packing, maintaining the packing preload in a state of sealing balance. This high-performance balanced sealing ring effectively provides a sealing effect.

[0029] 5. Regular injection of lubricating oil through the grease injector ensures lubrication of both sets of packings, effectively improving the sealing effect.

[0030] 6. A pressure-reducing and stabilizing section A is set on the basis of the existing valve core. Through the stability setting of the pressure-reducing and stabilizing section, the valve stem remains stable during movement, avoiding instability caused by left and right swaying under pressure impact.

[0031] In summary, the three-stage sealing effect—the interference seal of the O-ring, the seal of the packing, and the elastic seal of the sealing ring—significantly reduces leakage of the sealing material and prevents the entry of external impurities, effectively improving the sealing performance. This allows the packing system to operate maintenance-free during a major overhaul cycle, ensuring stable production and overall system safety, while reducing production and maintenance costs. The stability setting of the pressure-reducing stabilizing section ensures the valve stem remains stable during movement, preventing instability caused by lateral swaying under pressure shocks. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of the present invention.

[0033] Figure 2 This is a cross-sectional view of the present invention.

[0034] The component names corresponding to the reference numerals in the attached drawings are as follows:

[0035] 1-Valve stem, 2-Valve body, 3-Oil injector, 4-Packing gland, 5-Bolt, 6-Nut, 7-O-ring, 8-Lantern sleeve, 9-Packing, 10-Packing base gasket, 11-Sealing ring, 12-Protruding platform, 21-Inner groove, 41-Upper part of packing gland, 42-Lower part of packing gland, 43-Groove, 91-Upper packing assembly, 92-Lower packing assembly, I-Inlet port, O-Outlet port, A1-Sealing wing, A2-Valve core assembly, A3-Sealing body, A4-Sealing seat, A5-Sealing nut, A6-Block, A7-Gap, A8-Elastic component Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings:

[0037] like Figure 1 As shown, a rapid pressure reduction control valve includes a valve stem 1, a valve body 2, an oil injector 3, a packing gland 4, bolts 5, nuts 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 includes an upper part 41 and a lower part 42. The upper part 41 is tightened to the valve body 2 by bolts 5 and nuts 6. The valve body 2 has an inner groove 21 for inserting the valve stem 1, the lower part 42 of the packing gland 42, the lantern sleeve 8, the packing 9, the packing base gasket 10, and the sealing ring 11. The outer surface of the lower part 42 of the packing gland has an annular groove 43. 3. An O-ring 7 is inserted into the annular groove 43 by interference fitting, and then it is in close 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, and after being screwed and tightened, it presses the packing 9 downward. The packing 9 includes an upper packing group 91 and a lower packing group 92. The upper packing group 91 and the lower packing group 92 are separated by a lantern sleeve 8. The oil injector 3 is connected to the lantern sleeve 8. A packing base pad 10 is placed at the lower part of the lower packing group 92. The packing base pad 10 supports the packing 9. A sealing ring 11 is set below the packing base pad 10. The sealing ring 11 is set on the protruding platform 12 of the inner groove of the valve body 2.

[0038] The rapid pressure reduction control valve also includes a pressure reduction stabilizing part A disposed inside the valve body 2. The pressure reduction stabilizing part A includes a sealing wing A1, a valve core assembly A2, a sealing body A3, a sealing seat A4, a sealing nut A5, a stop body A6, a gap A7, and an elastic component A8. The sealing wing A1, the sealing body A3, and the sealing seat A4 are installed on the valve stem 1. The sealing wing A1 and the sealing body A3 are separately disposed. The sealing body A3 cooperates with the valve body 2. The valve core assembly A2 is disposed in the middle of the sealing body A3. The valve core assembly A2 cooperates with the sealing wing A1. The valve core assembly A2 is installed on the valve stem 1 below the sealing wing A1. The sealing seat A4 is disposed below the valve core assembly A2. The sealing seat A4 cooperates with the valve stem 1 and can drive the sealing body A3 to move relative to the valve body 2.

[0039] Furthermore, the sealing body A3 has a downward-opening circular groove structure, with a hollow central area serving as the housing for the valve core assembly A2. The sealing wing A1 is positioned above the hollow structure and fixed to the valve stem 1. The sealing wing A1, in conjunction with the hollow structure, forms a pre-opening valve that can be opened before the sealing body A3 is opened. The valve core assembly A2 is installed below the sealing wing A1, and a sealing nut A5 is installed at the end of the valve stem 1. A sealing seat A4 and an elastic component A8 are installed between the sealing nut A5 and the valve core assembly A2. The sealing seat A4, after the sealing wing A1 opens, drives the sealing body A3 to move upwards along with the valve stem 1, allowing media flow and thus opening the valve. The sealing seat A4 has a bolt-like structure at its center, and the sealing nut A5 can be screwed on to prevent it from falling off when engaged with the valve stem 1. The elastic component A8 provides elastic cushioning during the movement of the sealing seat A4. Below the sealing wing A1, the valve core assembly A2, is the valve core structure of a pilot-operated control valve.

[0040] Furthermore, the elastic component A8 can be a spring or a sealing ring 11.

[0041] Preferably, the O-ring 7 is an oxygen O-ring.

[0042] Preferably, the interference fit of the O-ring 7 is 20-30 filaments.

[0043] Preferably, the sealing ring 11 is an elastic energy storage sealing ring.

[0044] Optionally, the sealing ring 11 has a lip-shaped inner circle.

[0045] Preferably, the materials of the O-ring 7 and the sealing ring 11 are 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, which is determined according to the material of the sealing substance.

[0046] Preferably, the inner diameter of the sealing ring 11 is the same as the diameter of the valve stem 1. After being compressed, it will produce a deformation interference to tightly contact the valve stem 1 and perform bubble-level sealing.

[0047] Preferably, the interference fit of the sealing ring 11 is 30-40 mils, and the cross-sectional diameter of the sealing ring 11 is determined by both the interference fit and the system pressure.

[0048] Preferably, the lip thickness of the sealing ring 11 is 0.3-0.4 times the cross-sectional diameter of the sealing ring 11.

[0049] Optionally, the sealing ring 11 can be replaced with a high-performance spring-energy-storing sealing ring. A high-performance spring-energy-storing sealing ring is provided below the packing base 2. The system pressure will assist the spring in storing energy. The greater the pressure, the more fully the sealing lip fits the groove, thereby forming a high-pressure seal.

[0050] Preferably, each of the upper packing group 91 and the lower packing group 92 includes three packing materials.

[0051] Preferably, the lubricator 3 is filled with lubricant, which is periodically injected into the lantern sleeve. During the up-and-down movement of the valve stem, the lubricant is carried into the packing, ensuring valve stem lubrication and preventing excessive friction due to packing preload, which could cause valve stem creep and prevent adjustment. Regularly injecting lubricant into the lantern sleeve allows the oxygen valve's packing system to be maintenance-free for a major overhaul cycle.

[0052] Optionally, the lubricator 3 is filled with oxygen-free grease-free lubricant, and the lubricant is periodically injected into the lantern sleeve.

[0053] Furthermore, in order to ensure smooth opening of the sealing body A3, a gap A7 is provided between the sealing body A3 and the valve body 2; when the sealing wing A1 is opened, the maximum flow area is greater than or equal to more than 4 times the flow cross section of the gap A7, and more than 3 times the area of ​​the inlet I and the outlet O.

[0054] Furthermore, a stop A6 is provided on the lower outer side of the sealing body A3. This stop A6 protrudes outward relative to the sealing body A3, thus ensuring that the sealing body A3, when open, generates downward pressure, preventing it from detaching from the sealing seat A4 and avoiding problems caused by the sealing body A3 swaying during movement. The stop A6 is located below the gap A7.

[0055] Compared with the prior art, this invention patent has the following advantages:

[0056] 1. This invention is applicable to various sealing systems, including liquids and gases. Different sealing ring materials can be selected according to different materials, and replacement is simple and easy.

[0057] 2. Due to the use of O-rings in this system, the cost is low, the sealing performance is good, the application range is wide, and the structure is simple with a self-sealing function. Often, only one sealing element is needed to complete the sealing. The sealing effect is good. When used for reciprocating motion sealing, its sealing performance remains unchanged and the leakage of the medium is very small. It can both provide auxiliary sealing and prevent external impurities from entering.

[0058] 3. By setting up packing assemblies containing three packings at both the upper and lower ends, the number of packings is reduced while minimizing friction. The lower and upper packing assemblies can enhance the sealing of the valve stem from both the upper and lower ends.

[0059] 4. The use of a high-performance, elastic energy-storing sealing ring has two significant positive effects. First, by compressing the sealing ring under pressure, it deforms, creating an interference fit to tightly contact the valve stem, achieving a bubble-level seal. This greatly reduces leakage in the event of gas leaks, fully realizing a bubble-level sealing effect. Second, after the valve has been in use for a period of time, friction between the valve stem and the packing can wear down some of the packing, easily leading to valve leakage. Repairing at this point would delay production. However, the sealing ring, after being compressed by the packing, deforms under pressure, storing sufficient energy. This energy-storing seal supports the packing through elastic force. When the packing preload decreases, the energy-storing sealing ring provides continuous elastic force to continuously compress the packing, maintaining the packing preload in a state of sealing balance. This high-performance balanced sealing ring effectively provides a sealing effect.

[0060] 5. Regular injection of lubricating oil through the grease injector ensures lubrication of both sets of packings, effectively improving the sealing effect.

[0061] 6. A pressure-reducing and stabilizing section A is set on the basis of the existing valve core. Through the stability setting of the pressure-reducing and stabilizing section, the valve stem remains stable during movement, avoiding instability caused by left and right swaying under pressure impact.

[0062] In summary, the three-stage sealing effect—the interference seal of the O-ring, the seal of the packing, and the elastic seal of the sealing ring—significantly reduces leakage of the sealing material and prevents the entry of external impurities, effectively improving the sealing performance. This allows the packing system to operate maintenance-free during a major overhaul cycle, ensuring stable production and overall system safety, while reducing production and maintenance costs. The stability setting of the pressure-reducing stabilizing section ensures the valve stem remains stable during movement, preventing instability caused by lateral swaying under pressure shocks.

[0063] The implementation method of this invention is as follows: the packing gland is connected to the valve body by bolts and nuts. After the connection is fixed, the lower part of the packing gland only presses down on the packing, and the upper and lower packing groups are separated by the lantern sleeve. At this time, the bottom energy storage sealing ring deforms due to pressure. The deformation has two effects: first, its inner circular lip sealing ring is in close contact with the valve stem; second, its elastic energy storage can provide continuous pressure for the pre-tightening force of the packing, thereby avoiding the decrease of the packing pre-tightening force due to the continuous movement of the valve stem, maintaining the sealing of the entire system. After one production cycle, it can be readjusted and reused during maintenance.

[0064] The optimal interference fit of the sealing ring 11 is 30-40 microns, and the cross-sectional diameter of the sealing ring 11 is determined by both the interference fit and the system pressure. The cross-sectional diameter is calculated using the following method:

[0065] For dynamic seals, the continuous reciprocating motion of the valve stem leads to wear on the sealing ring, and the maximum allowable wear of the sealing ring is l. lost This maximum loss amount l lost The value is 30-40 mils; this loss is related to the compression of the sealing ring, and the compression... in Let D be the inherent compressibility of the sealing ring material and D be the cross-sectional diameter of the sealing ring. However, it's clear that the higher the inherent compressibility of the sealing ring material, the stronger its elastic deformation capability, but the more easily it is worn down and damaged by the reciprocating motion of the valve stem. A sealing ring that is easily damaged is obviously unsuitable for dynamic sealing environments. Therefore, the calculation of the cross-sectional diameter D depends on both the interference fit and the system pressure. The inner diameter of the sealing ring has a lip, the thickness of which is 0.3-0.4 times the cross-sectional diameter of the sealing ring.

[0066] In the pressure-reducing and stabilizing part A of this invention, when the valve is opened, the valve stem 1 only needs to be pulled up, and the high-pressure medium such as gas will have its pressure reduced due to the pressure reduction of the valve core assembly, causing the pressure difference across the sealing body A3 to decrease or disappear. When closed, the sealing body A3 closes first, and then the sealing wing A1 closes the passage of the valve core assembly A2. Once the sealing wing A1 is closed, under the action of the shut-off force in the same direction, the sealing wing A1 simultaneously blocks the channel for leakage of the high-pressure medium. Thus, at the moment of opening, this invention balances the impact of the high-pressure medium and stabilizes the movement of the valve stem 1 through the cooperation of the valve core assembly A2, the sealing wing A1, and the sealing body A3.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A rapid pressure reduction control valve, characterized in that: The valve body includes a valve stem (1), valve body (2), lubricator (3), packing gland (4), bolts (5), nuts (6), O-rings (7), lantern sleeve (8), packing (9), packing base gasket (10), and sealing ring (11). The packing gland (4) includes an upper part (41) and a lower part (42). The upper part (41) is tightened by bolts (5), nuts (6), and valve body (2). The valve body (2) has an inner groove (21) for inserting the valve stem (1), lower part (42), lantern sleeve (8), packing (9), packing base gasket (10), and sealing ring (11). The outer surface of the lower part (42) has an annular groove (43). The O-rings... (7) After the O-ring (7) is inserted into the annular groove (43) by interference fit, the O-ring (7) is in close 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). After tightening, the packing (9) is pressed down. The packing (9) includes an upper packing group (91) and a lower packing group (92). The upper packing group (91) and the lower packing group (92) are separated by a lantern sleeve (8). The oil injector (3) is connected to the lantern sleeve (8). A packing base pad (10) is placed at the lower part of the lower packing group (92). The packing base pad (10) supports the packing (9). A sealing ring (11) is set below the packing base pad (10). The sealing ring (11) is set on the protruding platform (12) of the inner groove of the valve body (2). The rapid pressure reduction control valve also includes a pressure reduction stabilizing part (A) disposed inside the valve body (2). The pressure reduction stabilizing part (A) includes a sealing wing (A1), a valve core assembly (A2), a sealing body (A3), a sealing seat (A4), a sealing nut (A5), a stop (A6), a gap (A7), and an elastic component (A8). The sealing wing (A1), the sealing body (A3), and the sealing seat (A4) are installed on the valve stem (1). The sealing wing (A1) and the sealing body (A3) are separately disposed. The sealing body (A3) cooperates with the valve body (2). The valve core assembly (A2) is provided in the middle of the sealing body (A3). The valve core assembly (A2) cooperates with the sealing wing (A1). The valve core assembly (A2) is installed on the valve stem (1) below the sealing wing (A1). The sealing seat (A4) is provided below the valve core assembly (A2). The sealing seat (A4) cooperates with the valve stem (1) to drive the sealing body (A3) to move relative to the valve body (2). The sealing body (A3) has a downward-opening circular groove structure, with a hollow central area serving as the housing for the valve core assembly (A2). The sealing wing (A1) is positioned above the hollow structure and fixed to the valve stem (1). The sealing wing (A1) and the hollow structure cooperate to form an openable start valve relative to the sealing body (A3). The valve core assembly (A2) is installed below the sealing wing (A1), and a sealing nut (A5) is installed at the end of the valve stem (1). A sealing seat (A4) and an elastic component (A8) are installed between the sealing nut (A5) and the valve core assembly (A2). The sealing seat (A4) is used to drive the sealing body (A3) to move upward along with the valve stem (1) after the sealing wing (A1) is opened, allowing the medium to flow. The center of the sealing seat (A4) has a bolt-like structure, which is screwed onto the sealing nut (A5). The valve core assembly (A2) below the sealing wing (A1) is the valve core structure of a pilot-operated regulating valve. A stop (A6) is provided on the lower outer side of the sealing body (A3); the stop (A6) forms an outward protrusion relative to the sealing body (A3) to ensure that the sealing body (A3) generates downward pressure when it is open, so that the sealing body (A3) can never be separated from the sealing seat (A4); the stop (A6) is located on the lower side of the gap (A7). The sealing ring (11) is an elastic energy storage sealing ring with a lip-shaped inner edge; the inner diameter of the sealing ring (11) is the same as the diameter of the valve stem (1). After being pressed, it will produce deformation interference to closely contact the valve stem (1) and perform bubble-level sealing.

2. The rapid pressure reduction control valve as described in claim 1, characterized in that, The O-ring (7) is an oxygen O-ring; the interference fit of the O-ring (7) is 20-30 filaments.

3. The rapid pressure reduction control valve as described in claim 1, characterized in that, The materials of the O-ring (7) and the sealing ring (11) are 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, which is determined according to the material of the sealing substance.

4. The rapid pressure reduction control valve as described in claim 1, characterized in that, The interference fit of the sealing ring (11) is 30-40 mils, and the cross-sectional diameter of the sealing ring (11) is determined by the interference fit and the system pressure.

5. The rapid pressure reduction control valve as described in claim 1, characterized in that, The lip thickness of the sealing ring (11) is 0.3-0.4 times the cross-sectional diameter of the sealing ring (11).

6. The rapid pressure reduction control valve as described in claim 1, characterized in that, The sealing ring (11) is a high-performance spring energy storage sealing ring.

7. The rapid pressure reduction control valve as described in claim 1, characterized in that, Each of the upper packing group (91) and the lower packing group (92) includes three packing materials.

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