CN105386894B - A kind of high pressure large velocity ratio flow control valve - Google Patents

A kind of high pressure large velocity ratio flow control valve Download PDF

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Publication number
CN105386894B
CN105386894B CN201510920518.1A CN201510920518A CN105386894B CN 105386894 B CN105386894 B CN 105386894B CN 201510920518 A CN201510920518 A CN 201510920518A CN 105386894 B CN105386894 B CN 105386894B
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CN
China
Prior art keywords
adjusting rod
restricting orifice
pressing plate
stepping motor
orifice
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CN201510920518.1A
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Chinese (zh)
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CN105386894A (en
Inventor
祁增强
袁洪滨
蔡德慧
陈展
王可立
赫伟涛
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Xian Aerospace Propulsion Institute
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Xian Aerospace Propulsion Institute
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Priority to CN201510920518.1A priority Critical patent/CN105386894B/en
Publication of CN105386894A publication Critical patent/CN105386894A/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02KJET-PROPULSION PLANTS
    • F02K9/00Rocket- engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
    • F02K9/42Rocket- engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof using liquid or gaseous propellants
    • F02K9/44Feeding propellants
    • F02K9/56Control
    • F02K9/58Propellant feed valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00Lift 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00Lift 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
    • F16K1/32Details
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00Actuating devices; Operating means; Releasing devices
    • F16K31/02Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/04Actuating devices; Operating means; Releasing devices electric; magnetic using a motor

Abstract

The present invention relates to a kind of high pressure large velocity ratio flow control valve, it is made up of linear stepping motor, adjusting rod, frame, restricting orifice, saddle type pad, locking nut, housing, pressing plate etc..Drive mechanism is linear stepping motor, and regulation part is made up of adjusting rod and restricting orifice.Linear stepping motor and housing are connected by frame, and the axle and adjusting rod of linear stepping motor link together, and are locked by saddle type pad and locking nut.Restricting orifice is fitted in housing by pressing plate, and the restricting orifice of different pore size can be changed according to different flow adjustment ranges.In order to ensure the sealing property under high pressure, sealed using two pass rubber o-ring at the dynamic sealing of external leakage.During regulation flow, control signal is input into linear stepping motor, linear stepping motor drive condition element moves up and down, and changes the circulation area of restricting orifice, so as to realize Flow-rate adjustment.

Description

A kind of high pressure large velocity ratio flow control valve
Technical field
The present invention relates to a kind of high pressure large velocity ratio flow control valve, various liquid rockets for needing to adjust flow are adaptable to Engine.
Background technology
Variable thrust rocket engine has the advantages that adjustable thrust, is the optimal selection of some aerospace craft systems.Such as The SSME SSME in the U.S., thrust can change in the range of 50~109% normal thrusts, and China CE-3 falls moon master Engine also has 5:1 thrust no-load voltage ratio.In variable thrust liquid rocket engine, it is often necessary to use flow control valve, Change the flow of propellant in Operation Process of Liquid Rocket Engine.
Existing single group unit flow control valve does not possess the function of changing restricting orifice so as to adjust range of flow, most of The regulating element displacement of flow control valve and flow are disproportionate, control more complicated.In the development of certain rocket engine, propulsion Agent is the hydrogen peroxide with severe corrosive, and system pressure is high, and changes in flow rate scope is big, it is necessary to adapt to different operating modes, is This devises this high pressure large velocity ratio flow control valve.
The content of the invention
In order to solve existing single group unit, flow control valve restricting orifice can not be changed, flow condition is inaccurate, control ratio compared with Complicated technical problem, the present invention proposes that a kind of control is simple, degree of regulation is high and flow no-load voltage ratio is big, be suitable for different operating modes Flow control valve.
Technical solution of the invention is:
A kind of high pressure large velocity ratio flow control valve, including housing 6, the access road 15 that is arranged on housing 6 and outlet are logical Road 16, is provided with Flow-rate adjustment component between the access road 15 and exit passageway 16, it is characterized in that:
The Flow-rate adjustment component includes restricting orifice 7, adjusting rod 5, linear stepping motor 1 and pressing plate 8,
Liquid reservoir 17 between the access road 15 and exit passageway 16 by being arranged in housing is connected, the section Discharge orifice plate 7 is arranged in liquid reservoir 17, and the section of connection access road 15 and exit passageway 16 is provided with the restricting orifice 7 Discharge orifice 71;
The adjusting rod 5 is coaxial with the output shaft of linear stepping motor 1, and 5 points of the adjusting rod is fastening part 51 and adjusts Section part 52, the fastening part 51 is fixedly connected with the output shaft of linear stepping motor 1, and the diameter of the regulation part 52 is Change;
The restricting orifice 7 just to an end housing at be provided with adjusting rod via 18, the adjusting rod via 18 and liquid Body cavity volume 17 is communicated, and adjusting rod via 18 is coaxial with throttle orifice 71;
The restricting orifice 7 just to another end housing at be provided with restricting orifice mounting hole 19, the restricting orifice peace Dress hole 19 is communicated with liquid reservoir 17, and the pressing plate 8 is arranged at restricting orifice mounting hole 19, between the pressing plate 8 and housing 6 Connection is detachably fixed, the axially arranged of pressing plate 8 has the pressing plate via 81 coaxial with throttle orifice 71;
The regulation part of the adjusting rod 5 sequentially passes through adjusting rod via 18, throttle orifice 71 and the pressing plate mistake being coaxially disposed Hole 81, adjusting rod changes the flow of media area of restricting orifice 7 under the drive of linear stepping motor 1;
The high pressure large velocity ratio flow control valve also includes sealing device, and the sealing device includes being arranged on restricting orifice Between housing 9 are sealed by the first potted component;It is additionally provided with for realizing adjusting rod and shell at the adjusting rod via 18 The second potted component 10 sealed between body, is additionally provided with close between adjusting rod and pressing plate for realizing at the pressing plate via 81 3rd potted component 11 of envelope, is additionally provided with the restricting orifice mounting hole 19 for realizing what is sealed between pressing plate and housing 4th potted component 12.
It is above basic structure of the invention, based on the basic structure, the present invention also makes following optimization and limits:
To ensure the output shaft of linear stepping motor 1 and being reliably connected for adjusting rod 5, the defeated of linear stepping motor 1 is realized The coaxial shape and synchronism of shaft and adjusting rod 5, in order to the accurate adjustment of flow, linear stepping motor of the invention 1 it is defeated It is processed into bolt in the shaft end of shaft;The axle center of the fastening part 51 of the adjusting rod 5 is provided with the output with linear stepping motor 1 Axle is engaged bolt hole 511, and the head of the bolt hole is additionally provided with one section of guiding unthreaded hole 512;
Locking nut 3 and pad 4, the locking nut 3 and pad are additionally provided with the output shaft of the linear stepping motor 1 Piece 4 is successively set between the head of bolt and the end face of adjusting rod 5, when output shaft and the screw thread of adjusting rod 5 of linear stepping motor 1 During fastening, tighten locking nut 3 and formed to lock.
Further, access road of the invention 15 is set in parallel in the both sides of liquid reservoir 17 with exit passageway 16, described Liquid reservoir 17 is perpendicular to access road 15 and exit passageway 16.The advantage of the topology layout is stepper motor output shaft and regulation Bar connection is reliable and coaxial, flows through the flow direction of restricting orifice along the axis of restricting orifice, the influence of aneroid direction of flow deviation, All liq flows through and discharge coefficient stabilization from restricting orifice.
Further, liquid reservoir of the invention 17 includes coaxial inlet liquid cavity volume 171 and outlet liquid reservoir 172, the inlet liquid cavity volume 171 is column with outlet liquid reservoir 172, and the diameter of inlet liquid cavity volume 171 is less than The diameter of liquid reservoir 172 is exported, restricting orifice installation is formd between inlet liquid cavity volume 171 and outlet liquid reservoir 172 Face 173;
The restricting orifice 7 is located at restricting orifice mounting surface 173, and the restricting orifice 7 includes the big end being coaxially disposed 73 and small end 72, the big end 73 is located in outlet liquid reservoir 172, and the small end 72 is located in Inlet fluid cavity volume 171, institute The first potted component is stated to be arranged between restricting orifice 7 and restricting orifice mounting surface 173.
The advantage of the structure qualification is that potted component can ensure that all liq flows through and without other points from restricting orifice Flow, the small end and housing of restricting orifice coordinate guiding to ensure coaxially, to export liquid reservoir slightly larger to ensure that liquid has foot after throttling Enough pressure stability regions, make discharge coefficient and outlet pressure more stablize.
Further, pressing plate of the invention is divided into construction section 82, seal section 83 and hold-down segment 84 vertically, described Peace seal section 83 and hold-down segment 84 are cylinder and coaxial, be all at the gabarit and housing 6 of the construction section 82 it is square, it is described The diameter of seal section 83 matches with the diameter of restricting orifice mounting hole 19, and the circumferencial direction of the seal section is provided with sealing Groove, the 4th potted component 12 is arranged in seal groove;The head of the hold-down segment 84 props up restricting orifice 7, the compression Section 84 is just to offering the through hole 85 through the radial direction of hold-down segment 84 at exit passageway 16 (at symmetrical two);
Pressing plate the first via 811, pressing plate that pressing plate via 81 is sequentially reduced including diameter successively along hold-down segment to installation end Second via 812 and the via 813 of pressing plate the 3rd, two groove seal grooves, described are further opened with along the hole wall of the via 813 of pressing plate the 3rd Three potted components 11 are separately positioned in two seals groove.
The advantage of the specific structure of pressing plate of the present invention is that sealed end 83 and housing 6 coordinate to be oriented to and ensure coaxial, pressing plate and Housing is bolted can change restricting orifice according to flow adjustment range, and ensure outlet 85 and outlet by bolt positioning Relatively, outlet 85 sets and make at symmetrical two pressing plate uniform force, outlet pressure stabilization.
Further, linear stepping motor of the present invention 1 uses insertion shaft type.The advantage of the structure qualification is by ball wire Thick stick and motor integral are designed, and the stator of stepper motor is output as straight-line displacement, reduces stepper motor directly as output shaft Size and weight.
For the ease of control during Flow-rate adjustment, stepper motor is adjusted step number as unique control parameter, according to system need The flow to be adjusted and pressure drop, by formulaOrifice size A is calculated, so as to according to the straight of restricting orifice 7 Footpath node-by-node algorithm goes out the diameter of adjusting rod, and the adjustment type face of adjusting rod is gone out by optimization design.Production out after according to examination Test result, simulate stepper motor regulation step number andLinear relationship formula, the flow adjusted as needed during regulation Stepper motor regulation step number is directly calculated with pressure drop, stepper motor is adjusted into step number input controller, flow control valve Export the flow and pressure drop for needing.
Present invention advantage compared with prior art is:
1st, straight-line electric arbor of the present invention and regulation rod element are coaxially arranged, and using being accurately oriented to and being reliably connected, realize Stepper motor and regulating element coaxial synchronous are moved, it is ensured that the reliability of Flow-rate adjustment.Adjusting rod of the present invention and restricting orifice Coaxial design, and adjusting rod two ends positioning, can improve flow control accuracy, and restricting orifice is fitted in housing by pressing plate, can The restricting orifice of different pore size is changed according to different flow adjustment ranges.
2nd, inventive flow regulating valve, the regulation of the opening and flow of valve not against medium power, its pressure adaptation scope Greatly, Flow-rate adjustment no-load voltage ratio is big, and degree of regulation is high.
3rd, the present invention proposes that a kind of small volume, lightweight, control are simple, degree of regulation is high and flow no-load voltage ratio is big, is suitable for The flow control valve of different operating modes;
4th, stepper motor is adjusted step number as unique control parameter for the present invention, and stepper motor regulation step number andIt is linear approximate relationship, controls simple and convenient.
Brief description of the drawings
Fig. 1 is high pressure large velocity ratio flow control valve of the invention;
Fig. 2 is housing section figure of the invention;
Fig. 3 is pressing plate sectional view of the invention;
Fig. 4 is adjusting rod sectional view of the invention;
Fig. 5 is restricting orifice sectional view of the invention;
Fig. 6 be stepper motor of the invention regulation step number andLinear relationship chart.
Wherein reference is:1- linear stepping motors, 2- frames, 3- locking nuts, 4- saddle types pad, 5- adjusting rods, 51- fastening parts, 511- bolts hole, 512- be oriented to unthreaded hole, 52- regulation part, 6- housings, 7- restricting orifices, 71- throttle orifices, 8- pressing plates, 81- pressing plates via, the via of 811- pressing plates first, the via of 812- pressing plates second, the via of 813- pressing plates the 3rd, 82- are installed Section, 83- seal sections, 84- hold-down segments, 85- through holes, the sealing of the potted components of 9- first, the potted components of 10- second, 11- the 3rd sealing Element, the potted components of 12- the 4th, 15- access roades, 16- exit passageways, 17- liquid reservoirs, 171- inlet liquids cavity volume, 172- outlets liquid reservoir, 173- restricting orifices mounting surface, 18- adjusting rods via, 19- restricting orifice mounting holes.
Specific embodiment
As shown in figure 1, high pressure large velocity ratio flow control valve of the invention is by linear stepping motor 1, frame 2, locking nut 3rd, saddle type pad 4, adjusting rod 5, housing 6, restricting orifice 7, pressing plate 8, rubber o-ring 9,10 are constituted.Access road 15 and outlet Liquid reservoir 17 between passage 16 by being arranged in housing is connected, and restricting orifice 7 is arranged in liquid reservoir 17, throttle orifice The throttle orifice 71 of connection access road 15 and exit passageway 16 is provided with plate 7;The output of adjusting rod 5 and linear stepping motor 1 Axle is coaxial, and 5 points of adjusting rod is fastening part 51 and regulation part 52, and fastening part 51 is consolidated with the output shaft of linear stepping motor 1 Fixed connection, the diameter for adjusting part 52 is change, restricting orifice 7 just to an end housing at be provided with adjusting rod via 18, Adjusting rod via 18 is communicated with liquid reservoir 17, and adjusting rod via 18 is coaxial with throttle orifice 71;Restricting orifice 7 just to it is another Restricting orifice mounting hole 19 is provided with end housing, restricting orifice mounting hole 19 is communicated with liquid reservoir 17, and pressing plate 8 is arranged on section At discharge orifice plate mounting hole 19, connection is detachably fixed between pressing plate 8 and housing 6, the axially arranged of pressing plate 8 has same with throttle orifice 71 The pressing plate via 81 of axle;The regulation part of adjusting rod 5 sequentially passes through adjusting rod via 18, throttle orifice 71 and the pressing plate being coaxially disposed Via 81, adjusting rod changes the flow of media area of restricting orifice 7 under the drive of linear stepping motor 1;High pressure large velocity ratio flow Regulating valve also includes that sealing is filled, and the sealing device is close by the first potted component including being arranged between restricting orifice and housing Envelope 9;The second potted component 10 for realizing being sealed between adjusting rod and housing, institute are additionally provided with the adjusting rod via 18 State the 3rd potted component 11 being additionally provided with pressing plate via 81 for realizing being sealed between adjusting rod and pressing plate, the throttle orifice The 4th potted component 12 for realizing being sealed between pressing plate and housing is additionally provided with plate mounting hole 19.
The axle and adjusting rod of linear stepping motor by it is accurate be oriented to and it is various be connected, linear stepping motor 1 it is defeated It is processed into bolt in the shaft end of shaft;The axle center of the fastening part 51 of adjusting rod 5 is provided with the output shaft phase with linear stepping motor 1 Fitted bolt hole 511, the head of bolt hole is additionally provided with one section of guiding unthreaded hole 512, is also set on the output shaft of linear stepping motor 1 Locking nut 3 and pad 4 are equipped with, locking nut 3 and pad 4 are successively set between the head of bolt and the end face of adjusting rod 5, when When the output shaft of linear stepping motor 1 is with 5 screw threads for fastening of adjusting rod, tightens locking nut 3 and formed to lock.
When using, the restricting orifice 7 of different pore size can be changed according to different flow adjustment ranges.The dynamic sealing of external leakage Place uses two pass rubber o-ring to be sealed to ensure high-pressure tightness.During Flow-rate adjustment, linear stepping motor drives regulation Bar axially movable, changes the circulation area of medium, so as to adjust flow.

Claims (7)

1. a kind of high pressure large velocity ratio flow control valve, including housing (6) is arranged on access road (15) and outlet on housing (6) Passage (16), Flow-rate adjustment component is provided between the access road (15) and exit passageway (16), it is characterised in that:
The Flow-rate adjustment component includes restricting orifice (7), adjusting rod (5), linear stepping motor (1) and pressing plate (8),
Liquid reservoir (17) between the access road (15) and exit passageway (16) by being arranged in housing is connected, described Restricting orifice (7) is arranged in liquid reservoir (17), and connection access road (15) is provided with the restricting orifice (7) with outlet The throttle orifice (71) of passage (16);
The adjusting rod (5) is coaxial with the output shaft of linear stepping motor (1), and the adjusting rod (5) is divided into fastening part (51) With regulation partly (52), the fastening part (51) is fixedly connected with the output shaft of linear stepping motor (1), the regulation part (52) diameter is change;
The restricting orifice (7) just to an end housing at be provided with adjusting rod via (18), the adjusting rod via (18) with Liquid reservoir (17) is communicated, and adjusting rod via (18) is coaxial with throttle orifice (71);
The restricting orifice (7) just to another end housing at be provided with restricting orifice mounting hole (19), the restricting orifice peace Dress hole (19) is communicated with liquid reservoir (17), and the pressing plate (8) is arranged on restricting orifice mounting hole (19) place, the pressing plate (8) It is detachably fixed between housing (6) and is connected, the axially arranged of pressing plate (8) has the pressing plate via coaxial with throttle orifice (71) (81);
The regulation part of the adjusting rod (5) sequentially passes through adjusting rod via (18), throttle orifice (71) and the pressing plate being coaxially disposed Via (81), adjusting rod changes restricting orifice (7) flow of media area under the drive of linear stepping motor (1);
The high pressure large velocity ratio flow control valve also includes that sealing is filled, and the sealing device includes being arranged on restricting orifice and housing Between by the first potted component seal (9);Adjusting rod via (18) place is additionally provided with for realizing adjusting rod and housing Between seal the second potted component (10), pressing plate via (81) place is additionally provided with for realizing between adjusting rod and pressing plate 3rd potted component (11) of sealing, restricting orifice mounting hole (19) place is additionally provided with for realizing between pressing plate and housing 4th potted component (12) of sealing.
2. high pressure large velocity ratio flow control valve according to claim 1, it is characterised in that:The diameter of adjusting rod is by section Out, orifice size A meets formula for the diameter and orifice size A node-by-node algorithms of discharge orifice plate (7)qmTable Show the flow of system needs regulation, and Δ P represents pressure drop.
3. high pressure large velocity ratio flow control valve according to claim 2, it is characterised in that:The linear stepping motor (1) The shaft end of output shaft be processed into bolt;The axle center of the fastening part (51) of the adjusting rod (5) is provided with and straight line stepping electricity The output shaft of machine (1) is engaged bolt hole (511), and the head of the bolt hole is additionally provided with one section and is oriented to unthreaded hole (512);
Locking nut (3) and pad (4), the locking nut (3) are additionally provided with the output shaft of the linear stepping motor (1) And pad (4) is successively set between the head of bolt and adjusting rod (5) end face, when linear stepping motor (1) output shaft with During adjusting rod (5) screw threads for fastening, tighten locking nut (3) and formed to lock.
4. high pressure large velocity ratio flow control valve according to claim 3, it is characterised in that:
The access road (15) is set in parallel in liquid reservoir (17) both sides, the liquid reservoir (17) with exit passageway (16) Perpendicular to access road (15) and exit passageway (16).
5. high pressure large velocity ratio flow control valve according to claim 4, it is characterised in that:
The liquid reservoir (17) includes coaxial inlet liquid cavity volume (171) and outlet liquid reservoir (172), it is described enter oral fluid Body cavity volume (171) is column with outlet liquid reservoir (172), and the diameter of inlet liquid cavity volume (171) is less than outlet liquid The diameter of cavity volume (172), restricting orifice mounting surface is formd between inlet liquid cavity volume (171) and outlet liquid reservoir (172) (173);
The restricting orifice (7) is positioned at restricting orifice mounting surface (173) place, and the restricting orifice (7) is big including what is be coaxially disposed End (73) and small end (72), in outlet liquid reservoir (172), the small end (72) is positioned at Inlet fluid for the big end (73) In cavity volume (171), first potted component is arranged between restricting orifice (7) and restricting orifice mounting surface (173).
6. the high pressure large velocity ratio flow control valve according to claim 1 or 2 or 3 or 4 or 5, it is characterised in that:The pressing plate Construction section (82), seal section (83) and hold-down segment (84), the construction section (82), seal section (83) and pressure are divided into vertically Tight section (84) is cylinder and coaxial, the diameter with diameter greater than restricting orifice mounting hole (19) of the construction section (82), institute The diameter and the diameter of restricting orifice mounting hole (19) for stating seal section (83) match, and the circumferencial direction of the seal section is provided with Seal groove, the 4th potted component (12) is arranged in seal groove;The head of the hold-down segment (84) props up restricting orifice (7), the hold-down segment (84) just goes out the through hole (85) offered through hold-down segment (84) radial direction to exit passageway (16);
The via of pressing plate first (811), pressing plate that pressing plate via (81) is sequentially reduced including diameter successively along hold-down segment to installation end Second via (812) and the via (813) of pressing plate the 3rd, two groove seal grooves are further opened with along the hole wall of the via (813) of pressing plate the 3rd, 3rd potted component (11) is separately positioned in two seals groove.
7. high pressure large velocity ratio flow control valve according to claim 6, it is characterised in that:Described linear stepping motor (1) insertion shaft type is used.
CN201510920518.1A 2015-12-10 2015-12-10 A kind of high pressure large velocity ratio flow control valve Active CN105386894B (en)

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Application Number Priority Date Filing Date Title
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CN105386894B true CN105386894B (en) 2017-06-13

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CN106640423B (en) * 2016-11-16 2018-08-03 上海空间推进研究所 The flow resistance regulating device of low thrust liquid attitude control engine unit
CN108225726B (en) * 2017-12-27 2019-10-01 西安航天动力研究所 A kind of liquid fluid system acoustics closed end inlet experiment boundary condition simulation device
CN110259968A (en) * 2019-07-03 2019-09-20 河南林硕农业科技发展有限公司 A kind of automatic hydrant

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US5148674A (en) * 1990-01-26 1992-09-22 Morris Brian G Method and apparatus for providing real-time control of a gaseous propellant rocket propulsion system
JP3925820B2 (en) * 1996-07-22 2007-06-06 株式会社アイ・エイチ・アイ・エアロスペース Cavitation venturi valve
CN203421231U (en) * 2013-07-22 2014-02-05 中国航天科技集团公司第六研究院第十一研究所 Ultra-low pressure constant pressure check valve
CN103953463A (en) * 2014-05-06 2014-07-30 中国航天科技集团公司第六研究院第十一研究所 Low flow resistance cone valve

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