CN116592166A - Multistage pressure limiting valve and pressure limiting method - Google Patents

Multistage pressure limiting valve and pressure limiting method Download PDF

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Publication number
CN116592166A
CN116592166A CN202310659838.0A CN202310659838A CN116592166A CN 116592166 A CN116592166 A CN 116592166A CN 202310659838 A CN202310659838 A CN 202310659838A CN 116592166 A CN116592166 A CN 116592166A
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CN
China
Prior art keywords
valve body
control port
pressure
guide rod
valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310659838.0A
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Chinese (zh)
Inventor
谢振东
梁向阳
梁一鸣
刘元成
李国涛
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Weihai Chongding Utopia Intelligent Equipment Co ltd
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Weihai Chongding Utopia Intelligent Equipment Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Weihai Chongding Utopia Intelligent Equipment Co ltd filed Critical Weihai Chongding Utopia Intelligent Equipment Co ltd
Priority to CN202310659838.0A priority Critical patent/CN116592166A/en
Publication of CN116592166A publication Critical patent/CN116592166A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/20—Excess-flow valves
    • F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
    • F16K17/24—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member
    • F16K17/28—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only
    • F16K17/30—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only spring-loaded
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/14—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with ball-shaped valve member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F16K17/06—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with special arrangements for adjusting the opening pressure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/20—Hydro energy

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Safety Valves (AREA)

Abstract

The invention provides a multistage pressure limiting valve and a pressure limiting method, wherein the multistage pressure limiting valve is provided with a valve body and a gland, the gland is detachably connected to the valve body, a guide rod and a valve core are arranged in the valve body, the valve core is positioned at the bottom of the valve body, the guide rod is positioned at the upper part of the valve core, a lower spring is arranged between the guide rod and the valve core, an upper spring is arranged between the valve core and the gland, the guide rod is of a ladder-shaped structure, a separation pad is sleeved on the guide rod, sealing devices are arranged between the guide rod and the valve body, between the guide rod and the separation pad, between the separation pad and the valve body, and between the separation pad and the valve body, an oil outlet and a control port are arranged on the side surface of the valve body, the control port is positioned above the oil outlet, the guide rod, the separation pad and the valve body form a cavity, and the control port is communicated with the cavity. The technical problems of short service life and high maintenance cost of the diaphragm compressor caused by large oil-gas pressure difference on two sides of the diaphragm of the conventional diaphragm machine are solved. The invention can be widely applied to the field of graded pressure control.

Description

Multistage pressure limiting valve and pressure limiting method
Technical Field
The present invention relates to a pressure regulating device and a method thereof, and more particularly, to a multistage pressure limiting valve and a pressure limiting method.
Background
At present, all diaphragm compressor diaphragms at home and abroad are always in a constant high pressure state at one side of an oil disc in operation, one side of an air disc is gradually raised from low pressure and suddenly stopped, and then gradually deflates to continuously raise pressure, so that the working process of repeated pressure transformation is repeated, the existing pressure limiting valve cannot meet the adjustment requirements of different pressure differences, the pressure differences at two sides lead the diaphragms of the diaphragm compressor to be subjected to high pressure impact force, the edges of the air outlet ends of the diaphragms corresponding to the diaphragm heads are subjected to strong shearing force, the service life of the diaphragms is shorter, and therefore the maintenance cost is improved.
At present, a mode of fixing a pressure limiting valve is adopted, so that the problem of large pressure difference at two sides of a diaphragm cannot be solved, and the service life of the diaphragm is low.
Disclosure of Invention
Aiming at the technical problems of short service life and high maintenance cost of the diaphragm compressor caused by large pressure difference between oil gas on two sides of the diaphragm of the existing diaphragm machine, the invention provides the multistage pressure limiting valve and the pressure limiting method, which change the opening pressure of the pressure relief opening by externally connecting different pressure sources, thereby avoiding great impact on the diaphragm of the diaphragm compressor, prolonging the service life and reducing the maintenance cost.
Therefore, the technical scheme of the invention is that the multistage pressure limiting valve is provided with a valve body and a gland, the gland is detachably connected to the valve body, a guide rod and a valve core are arranged in the valve body, the valve core is positioned at the bottom of the valve body, the guide rod is positioned at the upper part of the valve core, a lower spring is arranged between the guide rod and the valve core, an upper spring is arranged between the valve core and the gland, the guide rod is of a stepped structure, a spacer is sleeved on the guide rod, sealing devices are arranged between the guide rod and the valve body, between the guide rod and the spacer, between the spacer and the valve body, and between the side surface of the valve body, an oil outlet and a control port are arranged, the control port is positioned above the oil outlet, the guide rod, the spacer and the valve body form a cavity, and the control port is communicated with the cavity.
Preferably, the guide rod is of a split structure, the guide rod is provided with an upper guide rod, a middle guide rod and a lower guide rod, the upper spring is sleeved on the upper portion of the upper guide rod, the lower spring is sleeved on the valve core, the bottom of the upper guide rod is arranged on the upper surface of the middle guide rod, and the lower portion of the middle guide rod is sleeved on the upper portion of the lower guide rod.
Preferably, the control port comprises a first control port and a second control port, a first step surface is arranged on the upper guide rod, a second step surface is arranged on the middle guide rod, the first control port is a through hole formed in a valve body at the lower part of the first step surface, the second control port is a through hole formed in a valve body at the lower part of the second step surface, the isolation pad comprises an upper isolation pad and a lower isolation pad, the upper isolation pad is located at the lower part of the first control port, and the lower isolation pad is located at the lower part of the second control port.
Preferably, the first step surface area is larger than the second step surface area.
Preferably, the valve body and the gland are connected by threads.
Preferably, the lower part of the valve body is provided with external threads, the bottom end of the valve body is provided with a conical hole with a small upper part and a large lower part, the top end of the conical hole is provided with a steel ball, the valve core is provided with a central through hole and an inclined through hole, and the steel ball is positioned at the bottom end of the central through hole.
Preferably, the spacer is matched with the valve body through a spigot.
A voltage limiting method comprises the following specific steps:
(1) The initial pressure between the upper spring and the lower spring in the valve body is adjusted by adjusting the relative position of the gland and the valve body, wherein the initial pressure is set to be the highest unloading pressure of the controlled fluid, namely, the state when the control port is not opened;
(2) After the initial pressure is regulated, the first control port is kept closed, the second control port is opened, fluid with certain pressure is accessed through the second control port, the fluid enters the second cavity and acts on the second step surface, the rebound resistance of the lower spring is reduced under the action of the pressure, the compression force of the steel ball on the oil inlet is reduced, and the pressure reduction effect is realized.
A voltage limiting method comprises the following specific steps:
(1) The initial pressure between the upper spring and the lower spring in the valve body is adjusted by adjusting the relative position of the gland and the valve body, wherein the initial pressure is set to be the highest unloading pressure of the controlled fluid, namely, the state when the control port is not opened;
(2) After the initial pressure is regulated, the second control port is kept closed, the first control port is opened, fluid with certain pressure is accessed through the first control port, the fluid enters the first cavity and acts on the first step surface, and as the area of the first step surface is larger than that of the second step surface, the acting force applied to the first step surface is larger than that applied to the first step surface by the same pressure, namely the rebound resistance of the lower spring is reduced to a larger extent, the pressing force of the steel ball on the oil inlet is reduced, and the pressure reduction effect is realized.
A voltage limiting method comprises the following specific steps:
(1) The initial pressure between the upper spring and the lower spring in the valve body is adjusted by adjusting the relative position of the gland and the valve body, wherein the initial pressure is set to be the highest unloading pressure of the controlled fluid, namely, the state when the control port is not opened;
(2) After the initial pressure is regulated, the first control port and the second control port are opened, other fluid with certain pressure is accessed to act on the first step surface and the second step surface respectively, at the moment, the rebound resistance of the lower spring reaches the minimum value, the compression force of the steel ball on the oil inlet is minimum, and the maximum depressurization effect is realized.
The invention has the advantages that,
(1) According to the invention, the control port is arranged on the valve body, so that a cavity is formed by the valve body, the guide rod and the spacer at the control port, fluid with certain pressure is introduced through the control port, the guide rod is pushed to move upwards, part of spring pressure is counteracted, the pressing force of the steel ball on the oil inlet is reduced, the pressure limiting valve can be started when the oil pressure is low, the oil-gas pressure difference at two sides of the diaphragm is further reduced, and the diaphragm is effectively protected;
(2) Through setting up first control mouth, second control mouth to control respectively it, can realize different step-down effects: because the area of the first step surface is larger than that of the second step surface, when the same fluid acts on the two step surfaces, the thrust generated on the area of the first step surface is larger than that generated on the area of the second step surface, more step surfaces can be arranged according to the requirement, one or more or all of the step surfaces are opened, and different pressure limiting effects are realized;
(3) The guide rod is split, so that the guide rod is convenient to assemble and disassemble;
(4) The valve body is connected with the gland through threads, and the pressure of the gland acting on the upper spring can be adjusted through the screw depth of threads, so that the compression force of each component in the valve body is adjusted.
Drawings
FIG. 1 is a schematic diagram of the structure of an embodiment of the present invention when unloading pressure is highest;
FIG. 2 is a cross-sectional view taken along A-A of FIG. 1;
FIG. 3 is a schematic perspective view of an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of the first cavity and the second cavity of the present invention when both cavities are inflated.
The symbols in the drawings illustrate:
1. a valve body; 2. a valve core; 3. a gland; 4. a steel ball; 5. a lower spring; 6. an upper guide rod; 7. a middle guide rod; 8. a lower guide rod; 9. a lower spacer; 10. a spring is arranged; 11. an upper spacer; 12. a first control port; 13. a second control port; 14. an oil outlet; 15. a first step surface; 16. a second step surface; 17. a first cavity; 18. a second cavity; 19. a pressure relief cavity; 20. an oil inlet.
Detailed Description
The invention is further described below with reference to examples.
As shown in fig. 1-4, the multistage pressure limiting valve comprises a valve body 1 and a gland 3, wherein the upper end of the valve body 1 is provided with external threads, the lower end of the gland 3 is provided with internal threads, and the gland 3 is connected with the valve body 1 through threads. The upper part of the gland 3 is hexagonal in shape, so that the gland 3 is convenient to hang and screw. The valve body 1 is internally and sequentially provided with a valve core 2, a lower spring 5, a lower guide rod 6, a lower isolation pad 9, a middle guide rod 7, an upper isolation pad 11, an upper guide rod 6 and an upper spring 10 from bottom to top, the upper end of the upper spring 10 is propped against the gland 3, the lower end of the upper spring is sleeved on the upper guide rod 6, the upper end of the lower spring 5 is propped against the bottom of the lower guide rod 8, the lower end of the lower spring is sleeved on the valve core 2, the upper isolation pad 11 is sleeved on the lower part of the upper guide rod 6, the lower isolation pad 9 is sleeved on the lower part of the middle guide rod 7, and the upper isolation pad 11 and the lower isolation pad 9 are matched with an inner spigot of the valve body 1. Sealing rings are arranged between the upper isolation pad 11 and the valve body 1, between the lower isolation pad 9 and the valve body 1, between the upper isolation pad 11 and the upper guide rod 6, between the lower isolation pad 9 and the middle guide rod 7, and between the lower guide rod 8 and the valve body 1. The bottom of the valve body 1 is provided with an oil inlet 20, the side surface of the valve body 1 is provided with an oil outlet 14, the oil inlet 20 is a conical hole with a narrow upper part and a wide lower part, the valve core 2 is provided with a central through hole and an inclined through hole, a steel ball 4 is arranged between the upper part of the oil inlet 20 and the central through hole of the valve core 2, all components in the valve body 1 are in a compressed state except an upper isolation pad 11 and a lower isolation pad 9, the pressure of the upper spring 10 can be directly transmitted to the steel ball 4 to seal the oil inlet 20, and pressure relief is started when the steel ball 4 is jacked up.
The upper guide rod 6 is provided with a first step surface 15, the middle guide rod 7 is provided with a second step surface 16, the area of the first step surface 15 is larger than that of the second step surface 16, the valve body 1 is provided with a first control port 12 and a second control port 13, and the first control port 12 and the second control port 13 are used for accessing fluid with certain pressure. The first control port 12 is a through hole provided in the lower valve body 1 of the first stepped surface 15, and the second control port 13 is a through hole provided in the lower valve body 1 of the second stepped surface 16. The upper isolation pad 11 is positioned at the lower part of the first control port 12, the lower isolation pad 9 is positioned at the lower part of the second control port 13, a first cavity 17 is formed by the first step surface 15, the upper isolation pad 11 and the valve body 1, a second cavity 18 is formed by the second step surface 16, the lower isolation pad 9 and the valve body 1, a pressure release cavity 19 is formed by the valve body 1, the valve core 2 and the lower guide rod 8, and the pressure release cavity 19 is communicated with the oil outlet 14. The bottom of the valve body 1 is provided with external threads, and the multistage flow limiting valve can be installed on equipment or a pipeline in a threaded connection mode.
The method comprises the following specific steps of:
(1) The initial pressure between the upper spring 10 and the lower spring 5 in the valve body 1 is adjusted by adjusting the relative position of the gland 3 and the valve body 1, wherein the initial pressure is set to be the highest unloading pressure of the controlled fluid, namely, the state when the control port is not opened;
(2) After the initial pressure is regulated, the first control port 12 is kept closed, the second control port 13 is opened, fluid with certain pressure is accessed through the second control port 13, enters the second cavity 18 and acts on the second step surface 16, the rebound resistance of the lower spring 5 is reduced under the action of the pressure, the compression force of the steel ball 4 on the oil inlet 20 is further reduced, and the pressure of the oil outlet 14 is further reduced by one level;
(3) Or, the second control port 13 is kept closed, the first control port 12 is opened, fluid with certain pressure is accessed through the first control port 12, the fluid enters the first cavity 17 and acts on the first step surface 15, and the acting force applied to the first step surface 15 is larger than that applied to the second step surface 16 because the area of the first step surface 15 is larger than that of the second step surface 16, namely, the rebound resistance of the lower spring 5 is reduced to the greater extent, the pressing force of the steel ball 4 on the oil inlet 20 is reduced, and the pressure ratio of the oil outlet is reduced by one level in the step (2);
(4) Alternatively, the first control port 12 and the second control port 13 are both opened, and other fluid with a certain pressure is introduced to act on the first step surface 15 and the second step surface 16, respectively, at this time, the rebound resistance of the lower spring 5 reaches a minimum value, the pressing force of the steel ball 4 against the oil inlet 20 is minimum, and the pressure of the oil outlet 14 reaches a minimum.
By implementing the technical scheme, the service life of the diaphragm compressor can be obviously prolonged. The conventional fixed pressure limiting valve and the multistage pressure limiting valve of this embodiment are respectively applied to the same working conditions, and under the condition that the air outlet pressure at one side of the diaphragm compressor is the same, the impact force of the diaphragm is tested, as shown in table 1, the working condition i is a state in which the first control port 12 and the second control port 13 are all inflated, the working condition ii is a state in which the first control port 12 is inflated, the second control port 13 is closed, the working condition iii is a state in which the second control port 13 is inflated, the first control port 12 is closed, and the working condition iv is a state in which both the first control port 12 and the second control port 13 are closed. It is seen from the test data that the lower the pressure at the gas outlet of the diaphragm compressor, the more obvious the advantage of the multi-stage pressure limiting valve over the fixed pressure limiting valve protection diaphragm, and the longer the diaphragm life can be prolonged by more than about 10 times only from the 90% reduction in the impact force experienced by the diaphragm.
TABLE 1
When the pressure of the air outlet on the diaphragm compressor is frequently changed, an electromagnetic valve can be arranged, the opening and closing of a control port on the multi-stage limiting valve are controlled through the electromagnetic valve according to the pressure of the air outlet, and then the opening pressure of the multi-stage limiting valve is regulated and controlled, so that the impact force of a diaphragm caused by overlarge pressure difference is reduced, the service life is prolonged, and the maintenance cost is reduced. The guide rods and the isolation pads can be arranged according to the requirement, step surfaces with different areas are arranged on different guide rods, each step surface corresponds to one control port, and one or more or all control ports are opened according to the pressure requirement so as to realize different pressure level adjustment. All the guide rods are of split type structure, and the production and the installation are convenient.
The scheme can realize multistage pressure limiting overflow, can set up a plurality of sealed cavities, realizes pressure limiting overflow through opening corresponding control port to control fluid has required pressure in different working phases, simple structure, the reliability is high, convenient operation, can be widely applied to the occasion that various fluids need hierarchical control pressure, is particularly suitable for being used for protecting the hydraulic system of diaphragm compressor diaphragm. According to the technical scheme, the pressure value of the oil outlet is monitored or the quantity and the sequence of opening the control ports are set timely according to the working rule, so that the excessive oil pressure is unloaded, and the impact force on the diaphragm is reduced on the premise of not reducing the speed and the flow.
However, the foregoing is only illustrative of the present invention and is not to be construed as limiting the scope of the invention, and therefore, equivalent variations and modifications to the invention as defined by the appended claims should be construed to fall within the true scope of the invention.

Claims (10)

1. The utility model provides a multistage pressure limiting valve, its characterized in that is equipped with valve body and gland, the gland is detachably connected on the valve body, be equipped with guide arm and case in the valve body, the case is located the valve body bottom, the guide arm is located case upper portion, the guide arm with be equipped with down the spring between the case, be equipped with the spring between the case with the gland, the guide arm is echelonment structure, the cover is equipped with the spacer on the guide arm, between guide arm and the valve body, between guide arm and the spacer, between spacer and all be equipped with sealing device between the valve body, the valve body side is equipped with oil outlet and control mouth, the control mouth is located oil outlet top, the guide arm with the spacer and the valve body forms the cavity, the control mouth with the cavity intercommunication.
2. The multi-stage pressure limiting valve according to claim 1, wherein the guide rod is of a split type structure, the guide rod is provided with an upper guide rod, a middle guide rod and a lower guide rod, the upper spring is sleeved on the upper portion of the upper guide rod, the lower spring is sleeved on the valve core, the bottom of the upper guide rod is arranged on the upper surface of the middle guide rod, and the lower portion of the middle guide rod is sleeved on the upper portion of the lower guide rod.
3. The multi-stage pressure limiting valve according to claim 3, wherein the control port comprises a first control port and a second control port, a first step surface is arranged on the upper guide rod, a second step surface is arranged on the middle guide rod, the first control port is a through hole formed in a valve body at the lower part of the first step surface, the second control port is a through hole formed in a valve body at the lower part of the second step surface, the spacer comprises an upper spacer and a lower spacer, the upper spacer is positioned at the lower part of the first control port, and the lower spacer is positioned at the lower part of the second control port.
4. A multi-stage pressure limiting valve as set forth in claim 3 wherein said first stepped surface area is greater than said second stepped surface area.
5. The multi-stage pressure limiting valve of claim 1 wherein the valve body and the gland are threadably connected.
6. The multi-stage pressure limiting valve according to claim 1, wherein the lower portion of the valve body is provided with external threads, the bottom end of the valve body is provided with a conical hole with a small upper part and a large lower part, the top end of the conical hole is provided with a steel ball, the valve core is provided with a central through hole and an inclined through hole, and the steel ball is positioned at the bottom end of the central through hole.
7. The multi-stage pressure limiting valve of claim 1 wherein the spacer mates with the valve body through a spigot.
8. A pressure limiting method using the multi-stage pressure limiting valve of any one of claims 3-7, characterized by: the specific method comprises the following steps:
(1) The initial pressure between the upper spring and the lower spring in the valve body is adjusted by adjusting the relative position of the gland and the valve body, wherein the initial pressure is set to be the highest unloading pressure of the controlled fluid, namely, the state when the control port is not opened;
(2) After the initial pressure is regulated, the first control port is kept closed, the second control port is opened, fluid with certain pressure is accessed through the second control port, the fluid enters the second cavity and acts on the second step surface, the rebound resistance of the lower spring is reduced under the action of the pressure, the compression force of the steel ball on the oil inlet is reduced, and the pressure reduction effect is realized.
9. A pressure limiting method using the multi-stage pressure limiting valve of any one of claims 3-7, characterized by: the specific method comprises the following steps:
(1) The initial pressure between the upper spring and the lower spring in the valve body is adjusted by adjusting the relative position of the gland and the valve body, wherein the initial pressure is set to be the highest unloading pressure of the controlled fluid, namely, the state when the control port is not opened;
(2) After the initial pressure is regulated, the second control port is kept closed, the first control port is opened, fluid with certain pressure is accessed through the first control port, the fluid enters the first cavity and acts on the first step surface, and as the area of the first step surface is larger than that of the second step surface, the acting force applied to the first step surface is larger than that applied to the first step surface by the same pressure, namely the rebound resistance of the lower spring is reduced to a larger extent, the pressing force of the steel ball on the oil inlet is reduced, and the pressure reduction effect is realized.
10. A pressure limiting method using the multi-stage pressure limiting valve of any one of claims 3-7, characterized by: the specific method comprises the following steps:
(1) The initial pressure between the upper spring and the lower spring in the valve body is adjusted by adjusting the relative position of the gland and the valve body, wherein the initial pressure is set to be the highest unloading pressure of the controlled fluid, namely, the state when the control port is not opened;
(2) After the initial pressure is regulated, the first control port and the second control port are opened, other fluid with certain pressure is accessed to act on the first step surface and the second step surface respectively, at the moment, the rebound resistance of the lower spring reaches the minimum value, the compression force of the steel ball on the oil inlet is minimum, and the maximum depressurization effect is realized.
CN202310659838.0A 2023-06-02 2023-06-02 Multistage pressure limiting valve and pressure limiting method Pending CN116592166A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310659838.0A CN116592166A (en) 2023-06-02 2023-06-02 Multistage pressure limiting valve and pressure limiting method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310659838.0A CN116592166A (en) 2023-06-02 2023-06-02 Multistage pressure limiting valve and pressure limiting method

Publications (1)

Publication Number Publication Date
CN116592166A true CN116592166A (en) 2023-08-15

Family

ID=87607922

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310659838.0A Pending CN116592166A (en) 2023-06-02 2023-06-02 Multistage pressure limiting valve and pressure limiting method

Country Status (1)

Country Link
CN (1) CN116592166A (en)

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