CN110686105B - Pilot-operated type pressure reducing valve - Google Patents
Pilot-operated type pressure reducing valve Download PDFInfo
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- CN110686105B CN110686105B CN201910966247.1A CN201910966247A CN110686105B CN 110686105 B CN110686105 B CN 110686105B CN 201910966247 A CN201910966247 A CN 201910966247A CN 110686105 B CN110686105 B CN 110686105B
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- 230000001105 regulatory effect Effects 0.000 claims abstract description 29
- 239000012530 fluid Substances 0.000 claims description 18
- 238000004891 communication Methods 0.000 claims description 12
- 238000013016 damping Methods 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Classifications
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- 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
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
- F16K15/06—Check valves with guided rigid valve members with guided stems
- F16K15/063—Check valves with guided rigid valve members with guided stems the valve being loaded by a spring
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- 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
- F16K15/00—Check valves
- F16K15/18—Check valves with actuating mechanism; Combined check valves and actuated valves
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- 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
- F16K17/048—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 combined with other safety valves, or with pressure control devices
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- 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
- F16K47/00—Means in valves for absorbing fluid energy
- F16K47/02—Means in valves for absorbing fluid energy for preventing water-hammer or noise
- F16K47/023—Means in valves for absorbing fluid energy for preventing water-hammer or noise for preventing water-hammer, e.g. damping of the valve movement
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Safety Valves (AREA)
Abstract
The invention relates to a pilot-operated pressure reducing valve which comprises a valve sleeve, wherein a first connector is arranged on the side wall of the valve sleeve; the screw sleeve is in threaded connection with the upper end of the valve sleeve; the lower valve seat is fixedly connected to the lower end of the valve sleeve, and a second pressure relief opening is formed in the side wall of the lower valve seat; the upper valve seat is fixedly connected to the upper end of the valve sleeve; the screw plug is fixedly connected with the lower end of the lower valve seat; the pressure reducing valve core is arranged in the valve sleeve in a sliding manner; the safety valve core is sleeved on the periphery of the pressure reducing valve core; a safety spring; the one-way valve core is sleeved on the periphery of the pressure reducing valve core in a vertically sliding manner; a one-way spring; a pilot valve spool; pressure regulating subassembly. The pilot-operated pressure reducing valve has the advantages of simple structure, compact volume, high adjusting precision, safety function and one-way function, and can be used in occasions with large flow.
Description
Technical Field
The invention belongs to the technical field of valves, and particularly relates to a pilot type pressure reducing valve.
Background
The pressure reducing valve is a pressure control valve which adopts the opening degree of an opening and closing part in a control valve body to adjust the flow rate of a medium, reduces the pressure of the medium, and simultaneously adjusts the opening degree of the opening and closing part by the action of the pressure behind the valve so as to keep the pressure of a valve port within a certain range. Although the pressure reducing valve of the prior art, for example, the invention patent with application number 200710173770.6 and named as a superposition type pressure reducing valve can realize the pressure reducing function of medium flowing into the valve from the front of the valve, the pressure reducing valve has the following defects:
(1) when the medium flows into the valve from the back, the medium also passes through the flow regulating valve port, so that the medium has large pressure loss and does not have a one-way through function, and in order to realize the one-way function of the medium flowing into the valve from the back, a one-way valve is generally connected in parallel, so that the structure is complex and the volume is large;
(2) in order to realize the safety protection function, a medium behind the valve is communicated with the pressure relief opening by using the pressure reduction valve core, but when the pressure reduction valve core is clamped by impurities, the safety protection function cannot be realized, and the reliability is greatly reduced;
(3) when the pressure fluctuation before the valve is large, the pressure reduction pressure after the valve is unstable, and the adjustment precision is low;
(4) the pressure reducing valve is a direct-acting pressure reducing valve, and is only suitable for occasions with small flow rate because the diameter ratio of a control valve core is small and the through-flow capacity is poor in order to reduce the acting force of a pressure regulating spring.
Disclosure of Invention
The invention aims to solve the technical problem of providing a pilot type pressure reducing valve which has simple structure, compact volume, high adjusting precision, safety function and one-way function and can be used in large-flow occasions aiming at the current technical situation.
The technical scheme adopted by the invention for solving the technical problems is as follows: a pilot operated pressure reducing valve, characterized by: the valve sleeve comprises a valve sleeve, wherein a valve sleeve through hole penetrating along the axial direction is arranged in the valve sleeve, the valve sleeve through hole comprises a first valve sleeve through hole section, a second valve sleeve through hole section and a third valve sleeve through hole section from top to bottom, a first through hole communicated with the second valve sleeve through hole section and a second through hole communicated with the third valve sleeve through hole section are formed in the side wall of the valve sleeve, and the first through hole and the second through hole jointly form a first interface;
the screw sleeve is in threaded connection with the upper end of the valve sleeve, a screw sleeve inner hole with a downward opening is formed in the screw sleeve, a communicating groove communicated with the screw sleeve inner hole is formed in the upper end of the valve sleeve, and a first pressure relief opening is formed by the lower opening of the communicating groove;
the lower valve seat is fixedly connected to the lower end of the valve sleeve, a lower valve seat through hole penetrating along the axial direction is formed in the lower valve seat, the lower valve seat through hole comprises a first lower valve seat through hole section, a second lower valve seat through hole section and a third lower valve seat through hole section from top to bottom, and a second pressure relief opening communicated with the third lower valve seat through hole section is formed in the side wall of the lower valve seat;
the upper valve seat is fixedly connected to the upper end of the valve sleeve, an upper valve seat through hole penetrating along the axial direction is formed in the upper valve seat, and the upper valve seat through hole comprises a first upper valve seat through hole section and a second upper valve seat through hole section from top to bottom;
the screw plug is fixedly connected with the lower end of the lower valve seat, and a screw plug inner hole which penetrates through the screw plug along the axial direction is formed in the screw plug;
the pressure reducing valve core comprises a main body section and a necking section from bottom to top, the main body section can be matched in the through hole section of the second valve sleeve in a vertical sliding manner and extends downwards into the inner hole of the screw plug, the necking section can be matched in the through hole section of the second upper valve seat in a vertical sliding manner, in the first valve sleeve through hole section, a damping cavity is formed between the side wall of the pressure reducing valve core and the lower end face of the upper valve seat, a valve core through hole which penetrates through the pressure reducing valve core along the axial direction is formed in the pressure reducing valve core, a second interface is formed by a lower opening of the valve core through hole, a through flow groove which is matched with the first through hole is formed in the side wall of the pressure reducing valve core, the size of the communication area between the through flow groove and the first through hole can be changed by the up-and-down movement of the pressure reducing valve core, a first valve core through hole which is used for communicating the through flow groove with the valve core through hole and a second valve core through hole which is used for communicating the second lower valve seat through hole section with the valve core;
the safety valve core is positioned in the third lower valve seat through hole section and sleeved on the periphery of the main body section, and the safety valve core is matched with the lower opening of the second lower valve seat through hole section to control the on-off of the second lower valve seat through hole section and the second pressure relief opening;
the safety spring is arranged in the through hole section of the third lower valve seat, one end of the safety spring is abutted against the screw plug, and the other end of the safety spring is abutted against the safety valve core, so that the safety valve core keeps moving upwards to block the trend of the lower opening of the through hole section of the second lower valve seat;
the one-way valve core is arranged in the third valve sleeve through hole section in a vertically sliding manner and sleeved on the periphery of the main body section, and the one-way valve core is matched with an upper opening of the second lower valve seat through hole section to control the connection and disconnection of the second lower valve seat through hole section and the third valve sleeve through hole section;
the one-way spring is positioned in the third valve sleeve through hole section, one end of the one-way spring abuts against the bottom of the third valve sleeve through hole section, and the other end of the one-way spring abuts against the one-way valve core, so that the one-way valve core keeps moving downwards to block the trend that the second lower valve seat through hole section is communicated with the third valve sleeve through hole section;
the pilot valve core is arranged in the inner hole of the threaded sleeve and is matched with the upper opening of the through hole section of the first upper valve seat so as to control the connection and disconnection of the through hole section of the first upper valve seat and the first pressure relief opening;
and the pressure regulating assembly is arranged in the inner hole of the threaded sleeve and used for regulating the opening pressure of the pilot valve core.
Preferably, when fluid flows in from the first interface, the fluid at the first interface flows into the upper part of the one-way valve core through the second through-hole to push the one-way valve core to move downwards to block the communication between the second lower valve seat through-hole section and the third valve sleeve through-hole section, the fluid at the first interface can only flow into the second interface through the first through-hole, the flow through groove and the valve core through-hole, when the pressure at the second interface exceeds the set pressure of the pressure regulating assembly, the pilot valve core is opened, the pressure reducing valve core moves upwards under the action of differential pressure to reduce the communication area between the flow through groove and the first through-hole until the pressure at the second interface is equal to the set pressure, when the pressure at the second interface exceeds the safety pressure, the pressure reducing valve core moves upwards to completely block the communication between the flow through groove and the first through-hole, and the safety valve core is opened simultaneously, and the fluid at the second interface flows from the valve core through-, The third lower valve seat through hole section flows into a second pressure relief opening; when fluid flows in from the second interface, oil liquid of the second interface enters the second lower valve seat through hole section through the valve core through hole and the second valve core through hole, the one-way valve core is pushed to move upwards to open the upper opening of the second lower valve seat through hole section against the acting force of the one-way spring, and the fluid enters the first interface through the third valve sleeve through hole section and the second through hole from the second lower valve seat through hole section.
Preferably, the pressure regulating assembly comprises a regulating rod and a pressure regulating spring, the upper end of the regulating rod is in threaded connection with the threaded sleeve and extends out of the upper portion of the threaded sleeve, the lower end of the regulating rod is located in the threaded sleeve, one end of the pressure regulating spring is abutted to the lower end face of the regulating rod, and the other end of the pressure regulating spring is abutted to the pilot valve core, so that the pilot valve core keeps the trend of downwards moving and plugging the upper opening of the first upper valve seat through hole section.
Preferably, a retaining ring for limiting the pressure reducing valve core downwards is arranged on the side wall of the upper end of the main body section.
Preferably, a damper is arranged in the valve core through hole.
Preferably, the upper end of the safety valve core is provided with a first conical surface, and the first conical surface and the lower opening of the through hole section of the second lower valve seat form a linear seal.
Preferably, the lower end of the one-way valve core is provided with a second conical surface, and the second conical surface and the upper opening of the second lower valve seat through hole section form a linear seal.
Preferably, the lower end of the pilot valve core is provided with a third conical surface, and the third conical surface and the upper opening of the first upper valve seat through hole section form a linear seal.
Compared with the prior art, the invention has the advantages that:
(1) the invention has simple structure and compact volume;
(2) the one-way function can be realized without connecting a single one-way valve in parallel like the prior art;
(3) by arranging the damping cavity, the motion of the pressure reducing valve core can be damped when the second interface fluctuates, so that the pressure regulating precision is improved;
(4) by arranging the independent safety valve core, the safety protection function can be realized when the pressure reducing valve core fails, and the reliability is improved compared with the prior art;
(5) the invention is designed in a pilot mode and can be used in occasions with large flow.
Drawings
FIG. 1 is a cross-sectional view of an embodiment of the present invention;
fig. 2 is a schematic view of the structure of a valve sleeve in an embodiment of the present invention;
FIG. 3 is a schematic view of a lower valve seat structure in an embodiment of the present invention
Fig. 4 is a schematic structural diagram of a pressure reducing valve core in the embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
As shown in fig. 1-4, is a preferred embodiment of the present invention.
A pilot operated pressure reducing valve includes
Valve barrel 1 is equipped with the valve barrel through-hole that runs through along the axial in the valve barrel 1, the valve barrel through-hole is from last to including first valve barrel through-hole section 101, second valve barrel through-hole section 102 and third valve barrel through-hole section 103 down, is equipped with the first through-flow hole 104 that is linked together with second valve barrel through-hole section 102 and the second through-flow hole 105 that is linked together with third valve barrel through-hole section 103 on the lateral wall of valve barrel 1, and first through-flow hole 104 and second through-flow hole 105 constitute first interface A jointly.
The screw sleeve 10 is in threaded connection with the upper end of the valve sleeve 1, a screw sleeve inner hole with a downward opening is formed in the screw sleeve 10, a communicating groove 21 communicated with the screw sleeve inner hole is formed in the upper end of the valve sleeve 1, and a first pressure relief opening T1 is formed by the lower opening of the communicating groove 21.
Go up disk seat 14, go up disk seat 14 fixed connection in the upper end of valve barrel 1, be equipped with in the upper disk seat 14 along the last disk seat through-hole that the axial runs through, go up the disk seat through-hole and include first upper disk seat through-hole section and second upper disk seat through-hole section from top to bottom.
The screw plug 6 is fixedly connected with the lower end of the lower valve seat 3, and a screw plug inner hole which penetrates through the screw plug 6 along the axial direction is formed in the screw plug 6.
The pressure reducing valve core 4 comprises a main body section 4B and a necking section 4a from bottom to top, the main body section 4B can be matched in the second valve sleeve through hole section 102 in a vertically sliding manner and extends downwards into a screw plug inner hole, the necking section 4a can be matched in the second upper valve seat through hole section in a vertically sliding manner, a retaining ring 13 used for limiting the pressure reducing valve core 4 downwards is arranged on the side wall of the upper end of the main body section 4B, a damping cavity 1a is formed between the side wall of the pressure reducing valve core 4 and the lower end face of the upper valve seat 14 in the first valve sleeve through hole section 101, a valve core through hole 41 which penetrates along the axial direction is arranged in the pressure reducing valve core 4, the lower opening of the valve core through hole 41 forms a second interface B, a through flow groove 4B1 matched with the first through flow hole 104 is arranged on the side wall of the pressure reducing valve core 4, the communication area between the through flow groove 4B1 and the first through flow hole 104 can, the pressure reducing valve body 4 is provided with a first valve body through-hole 42 for communicating the flow groove 4b1 with the valve body through-hole 41 and a second valve body through-hole 43 for communicating the second lower valve seat through-hole section 32 with the valve body through-hole 41, and the pressure reducing valve body 4 is provided with a damper hole 44 for communicating the damper chamber 1a with the valve body through-hole 41.
And the safety valve core 9 is positioned in the third lower valve seat through hole section 33 and sleeved on the periphery of the main body section 4b, the safety valve core 9 is matched with the lower opening of the second lower valve seat through hole section 32 to control the on-off of the second lower valve seat through hole section 32 and the second pressure relief opening T2, a first conical surface is arranged at the upper end of the safety valve core 9, and the first conical surface and the lower opening of the second lower valve seat through hole section 32 form linear sealing.
And the safety spring 7d is arranged in the third lower valve seat through hole section 33, one end of the safety spring is abutted against the screw plug 6, and the other end of the safety spring is abutted against the safety valve core 9, so that the safety valve core 9 keeps moving upwards to block the trend of the lower opening of the second lower valve seat through hole section 32.
The check valve element 8 is arranged in the third valve sleeve through hole section 103 in a vertically sliding mode and sleeved on the periphery of the main body section 4b, the check valve element 8 is matched with an upper opening of the second lower valve seat through hole section 32 to control the second lower valve seat through hole section 32 and the third valve sleeve through hole section 103 to be switched on and off, a second conical surface is arranged at the lower end of the check valve element 8, and the second conical surface and the upper opening of the second lower valve seat through hole section 32 form linear sealing.
And the one-way spring 7c is positioned in the third valve sleeve through hole section 103, one end of the one-way spring 7c abuts against the bottom of the third valve sleeve through hole section 103, and the other end of the one-way spring abuts against the one-way valve core 8, so that the one-way valve core 8 keeps moving downwards to block the tendency that the second lower valve seat through hole section 32 is communicated with the third valve sleeve through hole section 103.
The pilot valve core 5 is arranged in the inner hole of the threaded sleeve, the pilot valve core 5 is matched with the upper opening of the first upper valve seat through hole section to control the on-off of the first upper valve seat through hole section and the first pressure relief port T1, the lower end of the pilot valve core 5 is provided with a third conical surface, and the third conical surface and the upper opening of the first upper valve seat through hole section form linear sealing.
The pressure regulating subassembly, the pressure regulating subassembly is established in the swivel nut hole for the opening pressure of accent pilot valve core, the pressure regulating subassembly is including adjusting pole 11 and pressure regulating spring 7a, adjusts the upper end threaded connection of pole 11 and stretches out the top of swivel nut 10 on the swivel nut 10, and the lower extreme of adjusting pole 11 is located swivel nut 10, and pressure regulating spring 7 a's one end is supported on adjusting the lower terminal surface of pole 11, and pressure regulating spring 7 a's the other end supports on pilot valve core 5, makes pilot valve core 5 keep the first upper shed trend of going up the valve seat through-hole section of downward removal shutoff.
The working principle and the process of the invention are as follows:
when fluid flows in from the first interface A, the fluid of the first interface A flows into the upper part of the check valve core 8 through the second through-hole 105, the check valve core 8 is pushed to move downwards to block the communication between the second lower valve seat through-hole section 32 and the third valve sleeve through-hole section 103, the fluid of the first interface A can only flow into the second interface B through the first through-hole 104, the through-flow groove 4B1 and the valve core through-hole 41, when the pressure of the second interface B exceeds the set pressure of the pressure regulating assembly, the pilot valve core 5 is opened, the pressure reducing valve core 4 moves upwards under the action of differential pressure to reduce the communication area between the through-flow groove 4B1 and the first through-hole 104 until the pressure of the second interface B is equal to the set pressure, when the pressure of the second interface B exceeds the safe flow groove pressure, the pressure reducing valve core 4 moves upwards to completely block the communication between the through-flow groove 4B1 and the first through-hole 104, and simultaneously, the safety valve core 9 is opened, and the fluid, The second lower seat through hole section 32 and the third lower seat through hole section 33 flow into the second pressure relief port T2.
When fluid flows in from the second port B, oil in the second port B enters the second lower valve seat through hole section 32 through the valve core through hole 41 and the second valve core through hole 43, the check valve core 8 is pushed to move upwards to open the upper opening of the second lower valve seat through hole section 32 against the acting force of the check spring 7c, and the fluid enters the first port a from the second lower valve seat through hole section 32 through the third valve sleeve through hole section 103 and the second through hole 105.
Claims (8)
1. A pilot operated pressure reducing valve, characterized by: comprises that
The valve sleeve comprises a valve sleeve (1), wherein a valve sleeve through hole penetrating along the axial direction is formed in the valve sleeve (1), the valve sleeve through hole comprises a first valve sleeve through hole section (101), a second valve sleeve through hole section (102) and a third valve sleeve through hole section (103) from top to bottom, a first through hole (104) communicated with the second valve sleeve through hole section (102) and a second through hole (105) communicated with the third valve sleeve through hole section (103) are formed in the side wall of the valve sleeve (1), and the first through hole (104) and the second through hole (105) jointly form a first interface (A);
the valve comprises a valve sleeve (1), a threaded sleeve (10) and a valve body (1), wherein the threaded sleeve (10) is in threaded connection with the upper end of the valve sleeve (1), a threaded sleeve inner hole with a downward opening is formed in the threaded sleeve (10), a communicating groove (21) communicated with the threaded sleeve inner hole is formed in the upper end of the valve sleeve (1), and a first pressure relief opening (T1) is formed by the lower opening of the communicating groove (21);
the valve sleeve comprises a lower valve seat (3), wherein the lower valve seat (3) is fixedly connected to the lower end of the valve sleeve (1), a lower valve seat through hole penetrating along the axial direction is formed in the lower valve seat (3), the lower valve seat through hole comprises a first lower valve seat through hole section (31), a second lower valve seat through hole section (32) and a third lower valve seat through hole section (33) from top to bottom, and a second pressure relief opening (T2) communicated with the third lower valve seat through hole section (33) is formed in the side wall of the lower valve seat (3);
the valve sleeve comprises a valve sleeve body (1), an upper valve seat (14), an upper valve seat through hole, a first upper valve seat through hole section and a second upper valve seat through hole section, wherein the upper valve seat (14) is fixedly connected to the upper end of the valve sleeve (1), the upper valve seat through hole penetrates through the upper valve seat (14) along the axial direction, and the upper valve seat through hole comprises the first upper valve seat through hole section and the second upper valve seat through hole section;
the screw plug (6), the screw plug (6) is fixedly connected at the lower end of the lower valve seat (3), the screw plug (6) is internally provided with a screw plug inner hole which penetrates through along the axial direction;
the pressure reducing valve core (4), the pressure reducing valve core (4) comprises a main body section (4B) and a necking section (4a) from bottom to top, the main body section (4B) can be matched in a second valve sleeve through hole section (102) in a vertically sliding mode and downwards extend into a screw plug inner hole, the necking section (4a) can be matched in a second upper valve seat through hole section in a vertically sliding mode, a damping cavity (1a) is formed between the side wall of the pressure reducing valve core (4) and the lower end face of an upper valve seat (14) in the first valve sleeve through hole section (101), a valve core through hole (41) which penetrates through along the axial direction is formed in the pressure reducing valve core (4), a second interface (B) is formed by a lower opening of the valve core through hole (41), a flow through groove (4B1) matched with a first flow through hole (104) is formed in the side wall of the pressure reducing valve core (4), and the communication area size of the flow through groove (4B1) and the first flow through hole (104) can be changed by the, a first valve core through hole (42) used for communicating the through flow groove (4b1) with the valve core through hole (41) and a second valve core through hole (43) used for communicating the second lower valve seat through hole section (32) with the valve core through hole (41) are arranged in the pressure reducing valve core (4), and a damping hole (44) used for communicating the damping cavity (1a) with the valve core through hole (41) is arranged in the pressure reducing valve core (4);
the safety valve core (9) is positioned in the third lower valve seat through hole section (33) and sleeved on the periphery of the main body section (4b), and the safety valve core (9) is matched with the lower opening of the second lower valve seat through hole section (32) to control the connection and disconnection of the second lower valve seat through hole section (32) and the second pressure relief opening (T2);
the safety spring (7d) is arranged in the third lower valve seat through hole section (33), one end of the safety spring (7d) abuts against the screw plug (6), and the other end of the safety spring abuts against the safety valve core (9), so that the safety valve core (9) keeps moving upwards to block the trend of a lower opening of the second lower valve seat through hole section (32);
the one-way valve core (8) is arranged in the third valve sleeve through hole section (103) in a vertically sliding mode and sleeved on the periphery of the main body section (4b), and the one-way valve core (8) is matched with an upper opening of the second lower valve seat through hole section (32) to control the second lower valve seat through hole section (32) and the third valve sleeve through hole section (103) to be switched on and off;
the one-way spring (7c) is positioned in the third valve sleeve through hole section (103), one end of the one-way spring (7c) abuts against the bottom of the third valve sleeve through hole section (103), the other end of the one-way spring abuts against the one-way valve core (8), and the one-way valve core (8) keeps moving downwards to block the trend that the second lower valve seat through hole section (32) is communicated with the third valve sleeve through hole section (103);
the pilot valve core (5) is arranged in the inner hole of the threaded sleeve, and the pilot valve core (5) is matched with the upper opening of the first upper valve seat through hole section to control the on-off of the first upper valve seat through hole section and the first pressure relief port (T1);
and the pressure regulating assembly is arranged in the inner hole of the threaded sleeve and used for regulating the opening pressure of the pilot valve core.
2. The pilot operated pressure reducing valve according to claim 1, wherein: when fluid flows in from the first interface (A), the fluid of the first interface (A) flows into the upper part of the check valve core (8) through the second through hole (105), the check valve core (8) is pushed to move downwards to block the communication between the second lower valve seat through hole section (32) and the third valve sleeve through hole section (103), the fluid of the first interface (A) can only flow into the second interface (B) through the first through hole (104), the through hole (4B1) and the valve core through hole (41), when the pressure of the second interface (B) exceeds the set pressure of the pressure regulating assembly, the pilot valve core (5) is opened, the pressure reducing valve core (4) moves upwards under the action of differential pressure to reduce the communication area between the through hole (4B1) and the first through hole (104) until the pressure of the second interface (B) is equal to the set pressure, when the pressure of the second interface (B) exceeds the safe pressure, the pressure reducing valve core (4) moves upwards to completely block the communication between the through hole (1) and the first through hole (104), meanwhile, the safety valve core (9) is opened, and fluid of the second interface (B) flows into a second pressure relief opening (T2) through a valve core through hole (41), a second valve core through hole section (43), a second lower valve seat through hole section (32) and a third lower valve seat through hole section (33); when fluid flows in from the second interface (B), oil liquid of the second interface (B) enters the second lower valve seat through hole section (32) through the valve core through hole (41) and the second valve core through hole (43), the one-way valve core (8) is pushed to move upwards to open the upper opening of the second lower valve seat through hole section (32) against the acting force of the one-way spring (7c), and the fluid enters the first interface (A) through the second lower valve seat through hole section (32) through the third valve sleeve through hole section (103) and the second through hole (105).
3. The pilot operated pressure reducing valve according to claim 1, wherein: the pressure regulating subassembly is including adjusting pole (11) and pressure regulating spring (7a), the upper end threaded connection who adjusts pole (11) is on swivel nut (10) and stretch out the top of swivel nut (10), the lower extreme that adjusts pole (11) is located swivel nut (10), the one end of pressure regulating spring (7a) is supported on the lower terminal surface of adjusting pole (11), the other end of pressure regulating spring (7a) supports on leading case (5), make leading case (5) keep the first upper shed's of going up valve seat through-hole section of downward movement shutoff trend.
4. The pilot operated pressure reducing valve according to claim 1, wherein: a check ring (13) used for limiting the pressure reducing valve core (4) downwards is arranged on the side wall of the upper end of the main body section (4 b).
5. The pilot operated pressure reducing valve according to claim 1, wherein: a damper (12) is arranged in the valve core through hole (41).
6. The pilot operated pressure reducing valve according to claim 1, wherein: the upper end of the safety valve core (9) is provided with a first conical surface, and the first conical surface and the lower opening of the second lower valve seat through hole section (32) form a line seal.
7. The pilot operated pressure reducing valve according to claim 1, wherein: the lower end of the one-way valve core (8) is provided with a second conical surface, and the second conical surface and the upper opening of the second lower valve seat through hole section (32) form linear sealing.
8. The pilot operated pressure reducing valve according to claim 1, wherein: the lower end of the pilot valve core (5) is provided with a third conical surface, and the third conical surface and the upper opening of the through hole section of the first upper valve seat form linear sealing.
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| CN201910966247.1A CN110686105B (en) | 2019-10-12 | 2019-10-12 | Pilot-operated type pressure reducing valve |
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| CN201910966247.1A CN110686105B (en) | 2019-10-12 | 2019-10-12 | Pilot-operated type pressure reducing valve |
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| CN110686105B true CN110686105B (en) | 2021-02-26 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111306333B (en) * | 2020-03-01 | 2023-05-16 | 浙江人一阀门制造有限公司 | Safety valve |
| CN111677922B (en) * | 2020-06-16 | 2023-08-08 | 涉县民安特种设备检测有限公司 | Safety valve |
| CN112682547B (en) * | 2021-01-18 | 2023-04-11 | 中国电子科技集团公司第二十九研究所 | Self-adaptive pressure relief and liquid containing device of penetrating liquid cooling case of electronic equipment |
| CN113983018B (en) * | 2021-10-28 | 2023-08-18 | 浙江三尚智迪科技有限公司 | One-way pressure reducing valve |
| CN114776851B (en) * | 2022-04-17 | 2023-04-07 | 西安航空学院 | Self-closed pressure release valve for liquid storage system |
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| DE2832964C2 (en) * | 1978-07-27 | 1982-09-09 | Thyssen Industrie Ag, 4300 Essen | Overpressure valve, primarily for hydraulic thrust piston gears of expansion elements in underground mining operations |
| DE102012104286A1 (en) * | 2012-05-16 | 2013-11-21 | Voss Automotive Gmbh | Pressure relief valve |
| CN105508674B (en) * | 2016-02-24 | 2017-11-03 | 湖北仁创科技有限公司 | A kind of slip damp type hydraulic overflow valve for high-pressure high-flow system |
| CN207454845U (en) * | 2017-10-16 | 2018-06-05 | 四川航天烽火伺服控制技术有限公司 | A kind of plug-in overflow valve |
| CN108709000B (en) * | 2018-08-22 | 2019-11-15 | 浙江斯丹特阀门股份有限公司 | A kind of flow type balanced valve of setting pressure automatic adjustment |
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Effective date of registration: 20210205 Address after: 311400 building 3, 200 Sanqiao Road, Fuchun street, Fuyang District, Hangzhou City, Zhejiang Province Applicant after: Zhejiang Fengyuan Instrument Co.,Ltd. Address before: Building J, micron Industrial Park, No.1, Tangwei TANGMING Road, Guangming New District, Shenzhen City, Guangdong Province Applicant before: Duan Jingsheng |
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