CN106402073B - It is a kind of by bellows pressure-sensitive and drive and with Flow amplification effect pilot valve - Google Patents
It is a kind of by bellows pressure-sensitive and drive and with Flow amplification effect pilot valve Download PDFInfo
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- CN106402073B CN106402073B CN201610904616.0A CN201610904616A CN106402073B CN 106402073 B CN106402073 B CN 106402073B CN 201610904616 A CN201610904616 A CN 201610904616A CN 106402073 B CN106402073 B CN 106402073B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/024—Pressure relief valves
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Driven Valves (AREA)
- Safety Valves (AREA)
Abstract
The invention discloses a kind of by bellows pressure-sensitive and the pilot valve for driving and being acted on Flow amplification, including valve body and the first-stage pilot valve being arranged in valve body and second level relay valve, the thrust that the bellows component of first-stage pilot valve is transmitted by pressure source is driven, and second level relay valve plays Flow amplification.The beneficial effects of the invention are as follows：Using the design without flowing and two-stage amplification, the precision of opening pressure of safety valve and closing presure can be effectively improved, and reduces and first leaks section.The variable quantity of pressure is changed into displacement, belongs to no flow design, pressure-sensitive side is blind end, can be substantially reduced the disturbance of the fluid after safety valve is opened, and Opening pressure is accurate, and repeatability is high.Add second level relay valve and play Flow amplification, first leak time can be efficiently reduced, main valve is opened rapidly in overpressure protection；The closure member of two-stage pilot valve uses pressure self-tightening sealing structure.
Description
Technical field
The present invention relates to pilot valve technical field of structures, in particular it relates to which one kind is by bellows pressure-sensitive and driving and has
The pilot valve of Flow amplification effect.
Background technology
A variety of forms, the closing of the main valve flap of most of pilot operated safety valves has been developed in pilot operated safety valve so far
Power is by by itself fluid media (medium) offer of protection system.After pilot valve is experienced system pressure and acted in advance, main valve control chamber is led to
Pilot valve pressure release is crossed, so as to drive main valve flap to open.Open and discharge when main valve, system pressure is reduced to after certain certain value, first
Pilot valve acts in advance again, cuts off the pressure release passage of main valve control chamber, and main valve control chamber refills pressure medium, makes main valve valve
Valve is closed.The function of pilot valve is exactly the pressurization or pressure release of control bound control chamber.
There is flow-type pilot valve while main valve is opened and discharged, fluid media (medium) also continued emissions inside pilot valve.This
When, the setting valve of pilot valve is easily influenceed and fluctuated by medium temperature, and its performance depends on moving component in valve and flowed
Dynamic characteristic when body flows, the performance parameter of pilot valve are not easily controlled.
The core pilot operated safety valve used in nuclear reactor primary Ioops system, it is to ensure nuclear reactor coolant system
And its connected pipeline and the key equipment of equipment safety, the reliability and accuracy requirement to its service behaviour are very high.To ensure
The safety of system equipment and pipeline, the Opening pressure of pilot valve must not have big skew.Put due to being had by protection system media
Penetrating property, the situation that not allowing safety valve has any interior leakage and leakage occurs, thus must assure that the sealing of valve seat and to surrounding
The sealing of environment.In order to reduce the discharge and loss of radioactivity pressure medium as far as possible, the blow pressure of safety valve should also use up can
Energy ground will also ensure the good sealing of valve seat before opening and after returning seat close to Opening pressure.
The content of the invention
The technical problems to be solved by the invention be to provide it is a kind of improve safety valve precision, without reciprocating movable sealing structure,
Reduce first leak time, self-energized seal by bellows pressure-sensitive and driving and with Flow amplification effect pilot valve.
Technical scheme is used by the present invention solves the above problems：
It is a kind of by bellows pressure-sensitive and to drive and with the pilot valve of Flow amplification effect, for the keying of control bound,
Including valve body and the first-stage pilot valve being arranged in valve body and second level relay valve；The inner space of described valve body along from
The direction of top to bottm is divided into pressure-sensitive chamber successively by multiple dividing plates, pretension adjusts chamber, first-stage pilot valve discharge chamber and fluid control
Chamber processed；Dividing plate is integral with valve body, and valve body is divided into several sections, is tightly connected between each section；Pressure-sensitive chamber and pretension adjust chamber every
Plate A top is provided with bellows A, bellows A upper shed by plug welded seal, the end face of bellows A under shed with
Dividing plate A welded seals connect, and valve rod from the bellows A of first-stage pilot valve under shed stretch into inside bellows A and and ripple
Pipe A core rod touch, the through hole passed through for valve rod is provided with dividing plate A, and through hole is located in bellows A, so as to ensure ripple
Pipe A and dividing plate can insulate pressure-sensitive chamber and pretension adjusts chamber, and the lower end of valve rod sequentially passes through pretension and adjusts chamber and first order elder generation
Pilot valve discharge chamber；Pretension adjusts chamber and first-stage pilot valve discharge chamber is separated by dividing plate B, is provided with dividing plate B and is passed through for valve rod
Through hole, and another bellows B is carried on valve rod, ensures that pretension adjusts the packing of chamber and first-stage pilot valve discharge chamber；Valve
The outer cover that bar is located at the part that pretension adjusts intracavitary is equipped with preloading spring A, is fixedly installed on valve rod for preloading spring A
End carries out spacing baffle plate, and pretension adjusts intracavitary and is provided with bearing for supporting preloading spring A lower ends, so as to preloading spring A
By baffle plate fixed on valve rod and it is arranged at pretension and adjusts the bearing of intracavitary and be fixed；Separate first-stage pilot valve discharge chamber and
The dividing plate C of fluid control chamber lower surface is provided with valve seat A, and dividing plate C through hole, the lower end of valve rod are provided through in valve seat A
In valve seat A through hole；The upper surface of the bottom plate of valve body is provided with valve seat B, and the logical of valve body bottom plate is provided through in valve seat B
Hole, the flap A being engaged with valve seat A and the work that fluid control chamber is divided into upper and lower two parts are provided with fluid control chamber
A is filled in, piston A upper and lower cavities are connected by the hole on piston, and piston A bottom is provided with the flap B being engaged with valve seat B；With valve
The flap A that seat A is engaged is pressed on valve seat A by preloading spring B, and flap B is pressed on valve seat B by preloading spring C, living
Flowing full body is all filled in the fluid control chamber of plug A upper and lower parts；The high-pressure fluid import of connection pressure-sensitive chamber is provided with valve body
With the main valve control chamber import for connecting the fluid control chamber positioned at piston A bottoms.
The bellows B with sealing function is welded with stem lower portion, the other end of the bellows B is welded in dividing plate B
On seal, prevent the emission in first-stage pilot valve discharge chamber from entering pretension and adjusting in chamber；The first order is first
Discharge orifice is provided with pilot valve discharge chamber, the discharge orifice is used to discharge the emission in first-stage pilot valve discharge chamber.
The pilot valve of the present invention can be used in nuclear reactor primary Ioops system, in use, by high-pressure fluid import and main valve
Snout cavity connection, the import of main valve control chamber connect with the control chamber of main valve, by the outlet plenum of valve seat B through hole and main valve company
It is logical.Main valve has snout cavity, outlet plenum and control chamber, and valve seat C, snout cavity and control chamber are provided between snout cavity and outlet plenum
Between pass through the aperture UNICOM on set piston B；Piston B is connected by main valve valve rod with the flap C that valve seat C is engaged,
Piston B top is connected with resetting-mechanism, and the opening and closing of main valve are realized by piston B drivings flap C.The ripple of pressure-sensitive intracavitary
The change of the change, i.e. main valve inlet cavity fluid pressure in pipe A sensed pressures source.When system pressure is less than set-pressure, the
One-level pilot valve and second level relay valve are all closed, and flap A and flap B press in preloading spring B and the pre- of preloading spring C respectively
It is brought into close contact under power in the fluid on valve seat A and valve seat B, being filled in the fluid control chamber of piston A upper and lower parts by flap A
Sealed with flap B, the fluid is filled with the space of piston A upper and lower parts, thus it all plays compression to flap A, flap B
Active force, the sealing force between flap and valve seat is formed, is pressure self-tightening sealing structure.
When system pressure reaches set-pressure, when the thrust driving bellows A transmitted at pressure source produces displacement, ripple
Pipe A band ovable valve stems are moved down, and so as to valve rod downward top pressure flap A, flap A is lifted off a seat A, and first-stage pilot valve is opened, because
This plays a part of guide's unlatching；Fluid in fluid control chamber flows into first-stage pilot valve discharge chamber by valve seat A, and from
Discharge orifice A is arranged outwardly, and then piston A is moved up in the presence of main valve control chamber flow of fluid so that flap B leaves valve
Seat B, second level relay valve are opened；Fluid in main valve control chamber is discharged through second level relay valve, and the piston B of main valve is to moving up
Dynamic, piston B drives flap C to lift off a seat C by main valve valve rod, main valve open.Second level relay valve is substantially piston A, valve
Form one of discharge outlet on valve B, valve seat B, preloading spring C, the import of main valve control chamber, valve body lower end portion and bottom plate is small-sized to release
Valve is put, plays Flow amplification effect.
By main valve discharge system media, system pressure decline, reach blow pressure when, preloading spring A promote valve rod to
Upper motion, bellows A recoveries of shape, makes flap A move closer to valve seat A, finally makes the first order first in the presence of preloading spring B
Pilot valve is closed；Meanwhile the fluid of piston A cavity of resorptions is flowed by the aperture on piston to piston A epicoeles, the pressure in upper and lower cavity
Balance is progressivelyed reach, second level relay valve is closed in the presence of preloading spring C, thus under resetting-mechanism effect, main valve weight
It is new to close, complete to open and close circulation.
Preferably, supporting plate is fixedly installed in the fluid control chamber on piston A tops, is provided with supporting plate for stream
The through hole that body passes through, preloading spring B one end press on flap A lower end, and the preloading spring B other end is pressed in supporting plate,
So as to which the flap A being engaged with valve seat A is pressed on valve seat A by preloading spring B, preloading spring C is arranged at supporting plate and piston A
Between, preloading spring C one end is pressed in supporting plate, and the preloading spring C other ends are pressed on piston A, so as to which flap B is by pretension
Spring C is pressed on valve seat B.
Preferably, flap A lower end is connected with guide rod, and preloading spring B is set in the outside of guide rod.
Preferably, it is provided with valve body and adjusts swivel nut for what is be oriented to valve rod, is advantageous to the smooth movement of valve rod；
Meanwhile adjust swivel nut and can carry out pretension and regulation to preloading spring A, to adjust the set-pressure of safety valve.
To sum up, the beneficial effects of the invention are as follows：
1st, the present invention is arranged on nuclear power unit voltage-stablizer, and superpressure guarantor is carried out to nuclear power unit by control bound
Shield；The pilot valve uses new principle and structure, is capable of the action of effective control bound；Its by be made within a valve body two
Level pilot valves are into and by closed bellows come the change in sensed pressure source；The bellows component of first-stage pilot valve is by pressing
The thrust transmitted at power source is driven, and second level relay valve plays Flow amplification；Set using what is amplified without flowing and two-stage
Meter, the precision of opening pressure of safety valve and closing presure can be effectively improved, and reduce and first leak section.
2nd, the variable quantity of pressure is changed into come the change in sensed pressure source by displacement using closed bellows component,
Belong to no flow design, pressure-sensitive side is blind end, can be substantially reduced the disturbance of the fluid after safety valve is opened, Opening pressure essence
Really, repeatability is high；A part of the bellows as pressure boundary simultaneously, more can be effective compared with traditional reciprocating movable sealing structure
Ground sealing medium；Without reciprocating movable sealing structure, it is only necessary to consider the static seal problem of structure under high-temperature and high-pressure conditions, drop significantly
The low design difficulty of valve.
3rd, by two-stage pilot valves into adding second level relay valve and play Flow amplification, elder generation can be efficiently reduced
Leak time, main valve is set to be opened rapidly in overpressure protection.
4th, the closure member of two-stage pilot valve uses pressure self-tightening sealing structure, i.e. pressure medium acts on the week of flap
Enclose, system pressure is bigger, and sealing force is bigger, therefore sealing property is reliable, first leaks section very little, and setting valve precision is high.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding the embodiment of the present invention, forms one of the application
Point, do not form the restriction to the embodiment of the present invention.In the accompanying drawings：
Fig. 1 is that the present invention is a kind of by bellows pressure-sensitive and the structural representation for the pilot valve for driving and having Flow amplification to act on
Figure；
Fig. 2 is the structural representation that pilot valve of the present invention is implemented with main valve control connection；
Mark and corresponding parts title in accompanying drawing：
1- valve bodies, 2- pressure-sensitive chambers, 3- pretensions adjust chamber, 4- first-stage pilot valve discharge chambers, 5- fluid control chambers, 6- dividing plates
A, 7- bellows A, 8- valve rod, 9- dividing plates B, 10- preloading spring A, 11- baffle plate, 12- bearings, 13- dividing plates C, 14- valve seat A, 15-
Bottom plate, 16- valve seats B, 17- flap A, 18- piston A, 19- flap B, 20- preloading spring B, 21- preloading spring C, 22- high-pressure spray
Body import, 23- main valve control chamber imports, 24- snout cavities, 25- outlet plenums, 26- control chambers, 27- valve seats C, 28- piston B, 29-
Main valve control chamber exports, 30- flaps C, 31- main valve valve rod, 32- resetting-mechanisms, 33- supporting plates, 34- guide rods, and 35- adjusts spiral shell
Set,
36- bellowss B, 37- discharge orifice.
Embodiment
The present invention will now be described in further detail with reference to the accompanying drawings and the accompanying drawings, but embodiments of the present invention
Not limited to this.
Embodiment 1
As shown in Figure 1-2, it is a kind of by bellows pressure-sensitive and the pilot valve for driving and being acted on Flow amplification, for controlling
The keying of main valve, including valve body 1 and the first-stage pilot valve and second level relay valve that are arranged in valve body 1, described valve body 1
Inner space along direction from top to bottom is divided into pressure-sensitive chamber 2 successively by multiple dividing plates, pretension adjusts chamber 3, first order guide
Valve discharge chamber 4 and fluid control chamber 5, dividing plate are integrated with valve body 1, and valve body is segment design, using sealed connection between each section.
The top that pressure-sensitive chamber 2 and pretension adjust the dividing plate A6 of chamber 3 is provided with bellows A7, and bellows A7 upper shed is welded close by plug
Envelope, the end face of bellows A7 under shed are connected with dividing plate A6 welded seals, and the valve rod 8 of first-stage pilot valve is from bellows A7's
Under shed stretch into inside bellows A7 and with bellows A7 core rod touch, be provided with the through hole passed through for valve rod 8 on dividing plate A6,
And through hole is located in bellows A7, so as to ensure bellows A7 and dividing plate can insulate pressure-sensitive chamber 2 and pretension adjusts chamber 3, valve rod 8
Lower end sequentially pass through pretension and adjust chamber 3 and first-stage pilot valve discharge chamber 4, pretension adjusts chamber 3 and first-stage pilot valve discharge
Chamber 4 is separated by dividing plate B9, and the through hole passed through for valve rod 8 is provided with dividing plate B9, and bellows is carried on valve rod 8, ensures pretension
Adjust the packing of chamber 3 and first-stage pilot valve discharge chamber 4, valve rod 8 is located at pretension and adjusts the outer cover of part in chamber 3 equipped with pre-
Tight spring A10, it is fixedly installed for carrying out spacing baffle plate 11 to preloading spring A10 upper ends on valve rod 8, pretension is adjusted in chamber 3
The bearing 12 for supporting preloading spring A10 lower ends is provided with, so as to which preloading spring A10 is by the He of baffle plate 11 fixed on valve rod 8
The bearing 12 that pretension is adjusted in chamber 3 is arranged to be fixed, separate first-stage pilot valve discharge chamber 4 and fluid control chamber 5 every
Plate C13 lower surface is provided with valve seat A14, and dividing plate C13 through hole is provided through in valve seat A14, and the lower end of valve rod 8 is located at valve
In seat A14 through hole, the upper surface of the bottom plate 15 of valve body 1 is provided with valve seat B16, and the bottom plate of valve body 1 is provided through in valve seat B16
15 through hole, the flap A17 and piston A18 being engaged with valve seat A14 is provided with fluid control chamber 5, piston A18 bottom is set
The flap B19 being engaged with valve seat B16 is equipped with, the flap A17 being engaged with valve seat A14 is pressed in valve seat by preloading spring B20
On A14, flap B19 is pressed on valve seat B16 by preloading spring C21, filling flowing full body in fluid control chamber 5, on valve body 1
It is provided with the high-pressure fluid import 22 of connection pressure-sensitive chamber 2 and the main valve control for connecting the fluid control chamber 5 positioned at piston A18 bottoms
Chamber import 23.There is the bellows B36 with sealing function in the lower weld of valve rod 8, the bellows B36 other end is welded in dividing plate
Sealed on B9, prevent the emission in first-stage pilot valve discharge chamber 4 from entering pretension and adjusting in chamber 3；Described first
Discharge orifice 37 is provided with level pilot valve discharge chamber 4, the discharge orifice 37 is used to discharge the row in first-stage pilot valve discharge chamber 4
Put thing.
The pilot valve of the present invention can be used in nuclear reactor primary Ioops system, in use, by high-pressure fluid import 22 with leading
The snout cavity 24 of valve connects, and main valve control chamber import 23 is connected with the control chamber 26 of main valve, by valve seat B16 through hole and main valve
Outlet plenum connection.Main valve has snout cavity 24, outlet plenum 25 and control chamber 26, is provided between snout cavity 24 and outlet plenum 25
Valve seat C27, piston B28 is provided between snout cavity 24 and control chamber 26, fluid is connected piston B28 by the aperture on piston up and down
Logical, control chamber 26 is connected with main valve control chamber outlet 29, is connected with the flap C30 that valve seat C27 is engaged by main valve valve rod 31
Piston B28, piston B28 top are connected with resetting-mechanism 32, and unlatching and the pass of main valve are realized by piston B28 drivings flap C30
Close.
The change of the change, the i.e. fluid pressure of main valve inlet chamber 24 in the bellows A7 sensed pressures source in pressure-sensitive chamber 2.When
When system pressure is less than set-pressure, first-stage pilot valve and second level relay valve are all closed, flap A17 and flap B19 difference
It is brought into close contact under preloading spring B20 and preloading spring C21 preload pressure on valve seat A14 and valve seat B16, fluid control chamber
Fluid in 5 is sealed by flap A17 and flap B19, and the fluid is filled with fluid control chamber 5, thus it is to flap A17, flap
B19 plays the active force of compression, forms the sealing force between flap and valve seat, is pressure self-tightening sealing structure.
When system pressure reaches set-pressure, when the thrust driving bellows A7 transmitted at pressure source produces displacement, ripple
Line pipe A7 band ovable valve stems 8 move down, and so as to valve rod 8 downward top pressure flap A17, flap A17 lifts off a seat A14, and the first order is first
Pilot valve is opened, therefore plays a part of guide's unlatching, and the fluid in fluid control chamber 5 flows into first order guide by valve seat A14
Valve discharge chamber 4, and from the row of discharge orifice 37 outwardly.And then piston A18 in the presence of the fluid of main valve control chamber 26 to moving up
It is dynamic so that flap B19 is lifted off a seat B16, and second level relay valve is opened, and the fluid in main valve control chamber 26 is through second level relay valve
Discharge, the piston B28 of main valve moved up, and piston B28 drives flap C30 to lift off a seat C27 by main valve valve rod 31, and main valve is beaten
Open.Second level relay valve is substantially a small-sized relief valve, plays Flow amplification effect.
System media is discharged by main valve, system pressure declines, and when reaching blow pressure, preloading spring A10 promotes valve rod 8
Motion upwards, bellows A7 recoveries of shape, makes flap A17 move closer to valve seat A14, finally in the presence of preloading spring B20
Close first-stage pilot valve；Meanwhile the medium of piston A18 cavity of resorptions flows into piston A18 epicoeles, piston by the aperture on piston
Pressure in A18 upper and lower cavities reaches balance, and second level relay valve is closed in the presence of preloading spring C21, in resetting-mechanism 32
Under effect, main valve is re-closing off, and completes to open and close circulation.
Embodiment 2
As shown in figure 1, it is a kind of by bellows pressure-sensitive and the pilot valve for driving and being acted on Flow amplification, in embodiment 1
On the basis of, supporting plate 33 is fixedly installed in the fluid control chamber 5 on piston A18 tops, confession is provided with supporting plate 33
The through hole that fluid passes through, preloading spring B20 one end press on flap A17 lower end, and the preloading spring B20 other end presses on branch
On fagging 33, so as to which the flap A17 being engaged with valve seat A14 is pressed on valve seat A14 by preloading spring B20, preloading spring C21
It is arranged between supporting plate 33 and piston A18, preloading spring C21 one end is pressed in supporting plate 33, the preloading spring C21 other ends
Press on piston A18, so as to which flap B19 is pressed on valve seat B16 by preloading spring C21,
Embodiment 3
As shown in figure 1, it is a kind of by bellows pressure-sensitive and the pilot valve for driving and being acted on Flow amplification, in embodiment 1
On the basis of, flap A17 lower end is connected with guide rod 34, and preloading spring B20 is set in the outside of guide rod 34.
Embodiment 4
As shown in figure 1, it is a kind of by bellows pressure-sensitive and the pilot valve for driving and being acted on Flow amplification, in embodiment 1
On the basis of, it is provided with valve body 1 and adjusts swivel nut 35 for what is be oriented to valve rod 8, beneficial to the smooth movement of valve rod 8.Together
When, pretension and regulation can be carried out to preloading spring A by adjusting swivel nut, to adjust the set-pressure of safety valve.
Above-described embodiment, the purpose of the present invention, technical scheme and beneficial effect are carried out further
Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc., all should include
Within protection scope of the present invention.
Claims (4)
- It is 1. a kind of by bellows pressure-sensitive and the pilot valve for driving and being acted on Flow amplification, it is characterised in that including valve body (1) And first-stage pilot valve and second level relay valve in valve body (1) are arranged at, the inner space of described valve body (1) is along from upper Direction under is divided into pressure-sensitive chamber (2) successively by multiple dividing plates, pretension adjusts chamber (3), first-stage pilot valve discharge chamber (4) and Fluid control chamber (5)；The top that the pressure-sensitive chamber (2) and pretension adjust the dividing plate A (6) of chamber (3) is provided with bellows A (7), institute The upper shed for stating bellows A (7) is welded by plug welded seal, end face and the dividing plate A (6) of the under shed of the bellows A (7) It is tightly connected；The valve rod (8) of the first-stage pilot valve and bellows A (7) core rod touch, the lower end point of the valve rod (8) Section sequentially passes through pretension and adjusts chamber (3) and first-stage pilot valve discharge chamber (4)；Pretension adjusts chamber (3) and first-stage pilot valve row Chamber (4) is put by dividing plate B (9) to be separated；The valve rod (8), which is located at pretension, adjusts the outer cover of the part in chamber (3) pretension bullet is housed Spring A (10), the preloading spring A (10) is by baffle plate (11) fixed on valve rod (8) and is arranged at pretension and adjusts branch in chamber (3) Seat (12) is fixed；The lower surface for separating the dividing plate C (13) of first-stage pilot valve discharge chamber (4) and fluid control chamber (5) is set Be equipped with valve seat A (14), the lower end of the valve rod (8) is located in valve seat A (14), the flap A (17) being engaged with valve seat A (14) by Preloading spring B (20) is pressed on valve seat A (14)；The upper surface of the bottom plate (15) of valve body (1) is provided with valve seat B (16), will flow The bottom that body control chamber (5) is divided into the piston A (18) of upper and lower two parts is provided with the flap B being engaged with valve seat B (16) (19), the flap B (19) is pressed on valve seat B (16) by preloading spring C (21), the fluid of piston A (18) upper and lower part Fluid media (medium) is filled with control chamber (5)；The high-pressure fluid import (22) of connection pressure-sensitive chamber (2) is provided with the valve body (1) With the main valve control chamber import (23) for connecting the fluid control chamber (5) positioned at piston A (18) bottom；There are the bellows B (36) with sealing function, the other end welding of the bellows B (36) in valve rod (8) lower weld Sealed on dividing plate B (9), prevent the emission in first-stage pilot valve discharge chamber (4) from entering pretension and adjusting chamber (3) In；Discharge orifice (37) is provided with the first-stage pilot valve discharge chamber (4), the discharge orifice (37) is used to discharge first order elder generation Emission in pilot valve discharge chamber (4).
- 2. it is according to claim 1 it is a kind of by bellows pressure-sensitive and drive and with Flow amplification effect pilot valve, its It is characterised by, supporting plate (33), supporting plate (33) is fixedly installed in the fluid control chamber (5) on described piston A (18) top On be provided with the through hole passed through for fluid；Preloading spring B (20) one end presses on the lower end of flap A (17), preloading spring B (20) The other end press in supporting plate (33)；Preloading spring C (21) one end is pressed in supporting plate (33), preloading spring C (21) The other end presses on piston A (18).
- 3. it is according to claim 1 it is a kind of by bellows pressure-sensitive and drive and with Flow amplification effect pilot valve, its It is characterised by, described flap A (17) lower end is connected with guide rod (34), and preloading spring B (20) is set in the outer of guide rod (34) Portion.
- It is 4. a kind of by bellows pressure-sensitive and the elder generation for driving and being acted on Flow amplification according to claim any one of 1-3 Pilot valve, it is characterised in that be provided with described valve body (1) for being oriented to valve rod (8) and being entered to preloading spring A (10) Row pretension adjusts swivel nut (35).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610904616.0A CN106402073B (en) | 2016-10-18 | 2016-10-18 | It is a kind of by bellows pressure-sensitive and drive and with Flow amplification effect pilot valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610904616.0A CN106402073B (en) | 2016-10-18 | 2016-10-18 | It is a kind of by bellows pressure-sensitive and drive and with Flow amplification effect pilot valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106402073A CN106402073A (en) | 2017-02-15 |
| CN106402073B true CN106402073B (en) | 2018-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610904616.0A Active CN106402073B (en) | 2016-10-18 | 2016-10-18 | It is a kind of by bellows pressure-sensitive and drive and with Flow amplification effect pilot valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP3425213B1 (en) * | 2017-07-03 | 2020-11-25 | LEONARDO S.p.A. | Safety valve and method for controlling a hydraulic circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB945477A (en) * | 1959-03-09 | 1964-01-02 | Hagan Controls Ltd | A pilot-valve controlled fluid pressure regulating valve |
| CN1030622C (en) * | 1993-06-06 | 1996-01-03 | 樊东升 | Self-operated fluid full-control valve |
| CN2217711Y (en) * | 1994-10-13 | 1996-01-17 | 甘靖 | Multi-stage pilot valve |
| CN1098431C (en) * | 1997-10-13 | 2003-01-08 | 赵文轩 | leakless safety valve |
| JP4196293B2 (en) * | 2004-08-02 | 2008-12-17 | Ｓｍｃ株式会社 | Vacuum pressure control valve |
| CN201373150Y (en) * | 2009-01-15 | 2009-12-30 | 吴江市东吴机械有限责任公司 | Pilot operated safety valve |
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2016
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