CN109404606A - Pressure balance type high-precision high voltage difference control valve - Google Patents
Pressure balance type high-precision high voltage difference control valve Download PDFInfo
- Publication number
- CN109404606A CN109404606A CN201811635087.4A CN201811635087A CN109404606A CN 109404606 A CN109404606 A CN 109404606A CN 201811635087 A CN201811635087 A CN 201811635087A CN 109404606 A CN109404606 A CN 109404606A
- Authority
- CN
- China
- Prior art keywords
- valve
- spool
- core housing
- valve core
- valve seat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000007789 sealing Methods 0.000 claims abstract description 32
- 230000003139 buffering effect Effects 0.000 claims abstract description 17
- 230000029142 excretion Effects 0.000 claims abstract description 14
- 230000008676 import Effects 0.000 claims description 6
- 238000004891 communication Methods 0.000 abstract description 2
- 230000006837 decompression Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K39/00—Devices for relieving the pressure on the sealing faces
- F16K39/02—Devices for relieving the pressure on the sealing faces for lift valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
-
- 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
- F16K47/04—Means in valves for absorbing fluid energy for decreasing pressure or noise level, the throttle being incorporated in the closure member
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Safety Valves (AREA)
Abstract
The present invention provides a kind of pressure balance type high-precision high voltage difference control valve, including valve body and relief passage, valve body two sides are equipped with inlet and outlet, relief passage is by spool, valve core housing and valve seat composition, excretion runner is equipped between valve core housing and valve body, spool set upper side is equipped with the discharge port being connected to excretion runner, drain runner and outlet, multiple annular convex platform are equipped at intervals on valve core housing inner wall, valve core housing lower end is equipped with valve seat, valve seat and inlet communication, spool is set in valve core housing and is slidably connected with valve core housing, spool lower end is the curved surface sealing surface cooperated with valve seat, it is axially spaced on spool to be equipped with multiple groups buffering group, every group of buffering group includes two symmetrically arranged dashpots, two adjacent groups buffering group shifts to install between each other, dashpot partly overlaps with annular convex platform when curved surface sealing surface cooperates with valve seat.The present invention provides the control that High Pressure Difference medium is realized using spool, valve core housing and valve seat, and regulation performance is good, and degree of regulation is high.
Description
Technical field
The present invention relates to valve technology fields, more particularly to a kind of pressure balance type high-precision high voltage difference control valve.
Background technique
There are many structures to design for the valve of High Pressure Difference medium at present, such as Multilayer sleeve, axial multistage string data, labyrinth
The structures such as formula, but Multilayer sleeve can only meet the control compared with small pressure difference, and flow window easily damages, and service life is short；
Though axial multistage string data pressure reduction structure has relatively good decompression energy and anti-blocking ability, its regulation performance and degree of regulation compare
Low, requirement of the common unbalanced structure to actuator is very high, and easily causes sharp pounding in face of High Pressure Difference medium, right
It is difficult to meet its adjusting requirement in the occasion of high-precision control；Mazy reduced pressure capabilities are the most prominent, but the cleaning to medium
Degree has higher requirement, and common discharge characteristic can only be designed as approximately linear, and regulation performance and precision are poor.
Summary of the invention
The technical problems to be solved by the present invention are: in order to overcome the shortcomings in the prior art, the present invention provides a kind of pressure
Force balance type high-precision high voltage difference control valve.
The present invention solves its technical problem technical solution to be taken: a kind of pressure balance type high-precision high voltage difference control
Valve processed, including valve body and be set to the intracorporal relief passage of the valve, the valve body two sides be equipped be connected to the relief passage
Inlet and outlet, the relief passage is made of spool, valve core housing and valve seat, and the valve core housing is set to the valve body vertically
It is interior, excretion runner is equipped between the valve core housing and valve body, the spool set upper side is equipped with the row being connected to the excretion runner
Drain port, the excretion runner and the outlet are equipped at intervals with multiple annular convex platform, the valve on the valve core housing inner wall
Core retainer plate lower end is equipped with the valve seat, the valve seat and the inlet communication, and the spool is set in the valve core housing and the valve
Core retainer plate is slidably connected, and the valve core diameter is identical as the annular convex platform internal diameter, and the spool lower end is to cooperate with the valve seat
Curved surface sealing surface, axially spaced on the spool to be equipped with multiple groups buffering group, buffering group described in every group includes two and symmetrically sets
The dashpot set, buffering group described in two adjacent groups shift to install between each other, thus when making the high-pressure medium flow through relief passage not
It stalls to energy is consumed with liquidating, the dashpot and the annular convex platform position and quantity correspond, the curved surface sealing
The dashpot partly overlaps with annular convex platform when face is with valve seat cooperation.
Valve core head is designed as the curved surface spool with top adjustment precision, realizes the accurate adjusting to High Pressure Difference medium；Spool
Middle part symmetric design has pressure-reducing cushioning group structure, and is dislocatedly distributed in 90 °, and medium can be divided into two when passing through these buffering groups
Road, every road liquidate by not stalling to converge in next dashpot backward, realize energy consumption, each pressure reduction structure have compared with
High flow resistance, the design of 3-6 buffering group, decompression series can achieve 12-24 grades, therefore this cage flow passage structure provides
Very high impedance, High Pressure Difference medium flow to spool upper end and converge, and stationary flow Xiang Houjing valve core housing discharge port flow to excretion runner
It is interior, finally valve is flowed out from outlet.Fluid step pressure reducing, direction constantly change, and increase flow resistance, control flowing velocity, prevent
Only cavitation destroy, it can be achieved that severe service lower valve long-term operation.Since spool uses the structure of axial multistage decompression
Design, is used cooperatively with valve core housing, is combined into relatively large relief passage, and spool notch edge is with very strong
Shearing force, therefore the structure valve is particularly suitable for that, containing the severe service of impurity particle, can prevent valve in high-pressure medium
The generation of clogging.
When valve is closed or small aperture is run, the lap D1 of spool and valve core housing can promote High Pressure Difference medium logical
The dashpot for crossing spool is depressurized, rather than on the sealing area of valve seat spool, sealing surface when spool moves upwards opening
It opens but decompression runner is still in closed state, when spool continues up, decompression runner opens small circulation area d, but
Circulation area D2 at sealing surface is more much bigger than spool recess aisle spare d, therefore flows through the medium pressure at sealing surface of seat
Power and speed can reduce, and have protection spool and sealing surface of seat effect.
It further, further include bonnet, in order to protect spool and sealing surface of seat, the bonnet, is set on the valve body
End, the bonnet, are used to cooperate with the spool upper end shaft shoulder along up-small and down-big stepped hole, the stepped hole is axially arranged with
The ruler of the rated travel of limiter valve, the curved surface sealing surface and the valve seat dashpot and annular convex platform lap when cooperating
Very little size is the 8%-12% of valve rated travel.
Further, the valve core upper sleeve is equipped with guide sleeve and balance sealing ring, and the guide sleeve is arranged in the stepped hole
Between valve core housing, the balanced seal circle is set to below the guide sleeve, and the poppet shaft is equipped with balance channel upwards, described
Spool upper end is equipped with the balance hole for being connected to the stepped hole and balance channel.
The setting of balance channel and balance hole realizes pressure balance type structure with balanced seal circle and guide sleeve jointly, because
It is mainly used for adjusting High Pressure Difference medium for valve, when spool is closed, the out-of-balance force of the high-pressure medium from import is very big,
And it acts on spool completely, the normal fortune that spool easily shakes and the power output very great talent of matched actuator is required to can ensure that valve
Row so using the setting of balance channel and balance hole on valve, and realizes sealing using balanced seal circle, when spool is closed
When, medium is flow in stepped hole from balance channel and balance hole, is kept spool upper and lower position pressure medium equal, is greatly reduced Jie
Matter acts on the out-of-balance force of spool, requires also to reduce much to the apolegamy of actuator, and improve the overall performance of valve
And service life.
The beneficial effects of the present invention are: a kind of pressure balance type high-precision high voltage difference control valve provided by the invention, uses
High-pressure medium flows through relief passage and is depressurized, and balance hole and gentle channel are machined on spool, with balanced seal circle, guide sleeve
With the use of pressure balance type structure is constituted, the out-of-balance force that high-pressure medium acts on spool can be substantially reduced, to reduce
Requirement to actuator, a possibility that reducing valve vibration, when valve is closed or small guide vane is run, spool and valve core housing
Lap High Pressure Difference medium can be promoted to be depressurized by the recess of spool, rather than in valve base sealing region, can prevent
Damage of the High Pressure Difference medium to spool and sealing surface of seat, improves valve service life.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is the structural schematic diagram of preferred embodiment；
Fig. 2 is the enlarged diagram of A in Fig. 1；
Fig. 3 is the structural schematic diagram of spool；
Fig. 4 is decompression schematic diagram when medium flows through relief passage；
Fig. 5 is status diagram when valve is closed；
Fig. 6 is the sealing surface protection structural schematic diagram when valve is closed or small aperture is run；
Sealing surface protects structural schematic diagram when Fig. 7 is valve opening.
In figure: 1, valve body, 2, import, 3, outlet, 4, spool, 5, valve core housing, 6, valve seat, 7, excretion runner, 8, discharge port,
9, annular convex platform, 10, curved surface sealing surface, 11, dashpot, 12, bonnet, 13, stepped hole, 14, the shaft shoulder, 15, guide sleeve, 16,
Balanced seal circle, 17, balance channel, 18, balance hole.
Specific embodiment
Presently in connection with attached drawing, the present invention is described in detail.This figure is simplified schematic diagram, is only illustrated in a schematic way
Basic structure of the invention, therefore it only shows the composition relevant to the invention.
As shown in figs. 1-7, a kind of pressure balance type high-precision high voltage difference control valve of the invention, including valve body 1 and set
Relief passage in the valve body 1,1 two sides of valve body are equipped with the import 2 being connected to the relief passage and outlet 3, institute
It states relief passage to be made of spool 4, valve core housing 5 and valve seat 6, the valve core housing 5 is set in the valve body 1 vertically, the spool
Excretion runner 7 is equipped between set 5 and valve body 1,5 upper end of valve core housing is equipped with the discharge port 8 being connected to the excretion runner 7,
The excretion runner 7 is connected to the outlet 3, is equipped at intervals with five annular convex platform 9, the valve on 5 inner wall of valve core housing
5 lower end of core retainer plate is equipped with the valve seat 6, and the valve seat 6 be connected to the import 2, the spool 4 be set to the valve core housing 5 it is interior and
The valve core housing 5 is slidably connected, and 4 diameter of spool is identical as 9 internal diameter of annular convex platform, 4 lower end of spool for institute
The curved surface sealing surface 10 for stating the cooperation of valve seat 6 is equipped at intervals with five groups of buffering groups along axially uniform on the spool 4, described in every group
Buffering group includes two symmetrically arranged dashpots 11, and buffering group described in two adjacent groups is in 90 ° and shifts to install between each other, thus
Do not stall high-pressure medium when flowing through relief passage to consuming energy with liquidating, the dashpot 11 and the annular convex platform 9
It sets and is corresponded with quantity, the curved surface sealing surface 10 dashpot 11 and 9 part of annular convex platform weight when cooperating with valve seat 6
It is folded.
It further include bonnet, 12, the bonnet, 12 is set to 1 upper end of valve body, and the bonnet, 12 is on being axially arranged with
Small lower big stepped hole 13, the stepped hole 13 are used for the rated travel with the 4 upper end shaft shoulder 14 of spool cooperation limiter valve,
The size of the curved surface sealing surface 10 and dashpot 11 and 9 lap D1 of annular convex platform described when the cooperation of valve seat 6 is valve
The 8% of door rated travel.
Guide sleeve 15 and balance sealing ring 16 are arranged on the spool 4, the guide sleeve 15 is arranged in the stepped hole
Between 13 and valve core housing 5, the balanced seal circle 16 is set to 15 lower section of guide sleeve, and 4 axial direction of spool is equipped with balance
Channel 17,4 upper end of spool are equipped with the balance hole 18 for being connected to the stepped hole 13 and balance channel 17.
Working principle:
When valve is closed, medium is flow in stepped hole 13 from balance channel 17 and balance hole 18, makes 4 upper and lower position of spool
Pressure medium is equal, greatly reduces the out-of-balance force that medium acts on spool 4, requires to substantially reduce to the apolegamy of actuator,
And improve the overall performance and service life of valve；
In the small aperture operation of valve, the lap D1 of spool 4 and valve core housing 5 can promote High Pressure Difference medium to pass through valve
The dashpot 11 of core 4 is depressurized, rather than on the sealing area of 6 spool 4 of valve seat, sealing when spool 4 moves upwards opening
Face, but runner is depressurized still in closed state, when spool 4 continues up, decompression runner opens small circulation area d, but
Circulation area D2 at sealing surface is more much bigger than 4 recess aisle spare d of spool, therefore flows through the medium at 6 sealing surface of valve seat
Pressure and speed can reduce, and have protection 4 curved surface sealing surface 10 of spool and 6 sealing surface effect of valve seat；
After valve fully opens, medium can be divided into two-way when passing through buffering group, every road is not by stalling backward under
One dashpot 11, which converges, to liquidate, and realizes that energy consumption, each group of buffering group flow resistance all with higher, five buffering groups are set
Meter, decompression series can achieve 24 grades, therefore this cage flow passage structure provides very high impedance, and High Pressure Difference medium is flow to
4 upper end of spool is converged, and 5 discharge port 8 of stationary flow Xiang Houjing valve core housing is flow in excretion runner 7, finally flows out valve from outlet 3.
Taking the above-mentioned ideal embodiment according to the present invention as inspiration, through the above description, relevant staff
Various changes and amendments can be carried out without departing from the scope of the present invention completely.The technical scope of this invention is not
The content being confined on specification, it is necessary to which the technical scope thereof is determined according to the scope of the claim.
Claims (3)
1. a kind of pressure balance type high-precision high voltage difference control valve, it is characterised in that: including valve body (1) and be set to the valve body
(1) relief passage in, valve body (1) two sides are equipped with the import (2) being connected to the relief passage and outlet (3), described
Relief passage is made of spool (4), valve core housing (5) and valve seat (6), and the valve core housing (5) is set in the valve body (1) vertically,
Excretion runner (7) is equipped between the valve core housing (5) and valve body (1), valve core housing (5) upper end is equipped with and the excretion runner
(7) discharge port (8) being connected to, the excretion runner (7) are connected to the outlet (3), are spaced on valve core housing (5) inner wall
Equipped with multiple annular convex platform (9), valve core housing (5) lower end is equipped with the valve seat (6), the valve seat (6) and the import (2)
Connection, the spool (4) be set to the valve core housing (5) in be slidably connected with the valve core housing (5), spool (4) diameter and
Annular convex platform (9) internal diameter is identical, and spool (4) lower end is the curved surface sealing surface (10) cooperated with the valve seat (6), institute
State on spool (4) it is axially spaced be equipped with multiple groups buffering group, buffering group described in every group include two symmetrically arranged dashpots
(11), buffering group described in two adjacent groups shifts to install between each other, thus make high-pressure medium do not stalled when flowing through relief passage to
Energy is consumed with liquidating, the dashpot (11) and the annular convex platform (9) position and quantity correspond, the curved surface sealing
The dashpot (11) partly overlaps with annular convex platform (9) when face (10) is with valve seat (6) cooperation.
2. pressure balance type high-precision high voltage difference control valve as described in claim 1, it is characterised in that: further include bonnet,
(12), the bonnet, (12) is set to the valve body (1) upper end, and bonnet, (12) edge is axially arranged with up-small and down-big ladder
Hole (13), the stepped hole (13) is used for the rated travel with the spool (4) the upper end shaft shoulder (14) cooperation limiter valve, described
Curved surface sealing surface (10) and the size of dashpot (11) described when valve seat (6) cooperation and annular convex platform (9) lap are
The 8%-12% of valve rated travel.
3. pressure balance type high-precision high voltage difference control valve as claimed in claim 2, it is characterised in that: on the spool (4)
It is arranged with guide sleeve (15) and balance sealing ring (16), the guide sleeve (15) is arranged in the stepped hole (13) and valve core housing
(5) between, the balanced seal circle (16) is set to below the guide sleeve (15), and it is logical that spool (4) axial direction is equipped with balance
Road (17), spool (4) upper end are equipped with the balance hole (18) for being connected to the stepped hole (13) and balance channel (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811635087.4A CN109404606A (en) | 2018-12-29 | 2018-12-29 | Pressure balance type high-precision high voltage difference control valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811635087.4A CN109404606A (en) | 2018-12-29 | 2018-12-29 | Pressure balance type high-precision high voltage difference control valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109404606A true CN109404606A (en) | 2019-03-01 |
Family
ID=65462714
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811635087.4A Pending CN109404606A (en) | 2018-12-29 | 2018-12-29 | Pressure balance type high-precision high voltage difference control valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109404606A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111779867A (en) * | 2020-08-03 | 2020-10-16 | 焦彪彪 | Vibration suppression pressure reducing valve |
| CN113108070A (en) * | 2021-05-08 | 2021-07-13 | 浙江理工大学 | Multistage pressure reduction string type liquid level regulating valve structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0139399A1 (en) * | 1983-09-10 | 1985-05-02 | Kent Process Control Limited | Pressure reducing valve |
| CN201428856Y (en) * | 2009-07-02 | 2010-03-24 | 大连亨利测控仪表工程有限公司 | High pressure difference particle fluid control valve |
| CN203067792U (en) * | 2012-12-27 | 2013-07-17 | 吴忠中创自控阀有限公司 | Multistage throttling regulating valve |
| CN203627964U (en) * | 2013-11-20 | 2014-06-04 | 无锡智能自控工程股份有限公司 | High-pressure micro-flow string type regulating valve |
| CN203809704U (en) * | 2014-05-05 | 2014-09-03 | 无锡卓尔阀业有限公司 | Axial-flow guide type multi-stage pressure-reduction high-pressure angle valve |
| CN104455469A (en) * | 2014-09-29 | 2015-03-25 | 北京航天动力研究所 | Throttling serial type multistage pressure reduction and adjustment valve |
| CN205578757U (en) * | 2015-10-28 | 2016-09-14 | 无锡斯考尔自动控制设备有限公司 | Multi stage decompression high pressure angle valve |
| CN206190934U (en) * | 2016-11-24 | 2017-05-24 | 吴忠中创自控阀有限公司 | Multi -functional super high pressure isolating valve |
| CN206309972U (en) * | 2016-12-19 | 2017-07-07 | 天津精通控制仪表技术有限公司 | A kind of Cascade Multistage decompression high-differential-pressure regulating valve |
| CN206816887U (en) * | 2017-06-09 | 2017-12-29 | 西安希佛隆阀门有限公司 | A kind of HTHP difference tandem balanced type regulating valve |
| CN209245439U (en) * | 2018-12-29 | 2019-08-13 | 吴忠仪表有限责任公司 | Pressure balance type high-precision high voltage difference control valve |
-
2018
- 2018-12-29 CN CN201811635087.4A patent/CN109404606A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0139399A1 (en) * | 1983-09-10 | 1985-05-02 | Kent Process Control Limited | Pressure reducing valve |
| CN201428856Y (en) * | 2009-07-02 | 2010-03-24 | 大连亨利测控仪表工程有限公司 | High pressure difference particle fluid control valve |
| CN203067792U (en) * | 2012-12-27 | 2013-07-17 | 吴忠中创自控阀有限公司 | Multistage throttling regulating valve |
| CN203627964U (en) * | 2013-11-20 | 2014-06-04 | 无锡智能自控工程股份有限公司 | High-pressure micro-flow string type regulating valve |
| CN203809704U (en) * | 2014-05-05 | 2014-09-03 | 无锡卓尔阀业有限公司 | Axial-flow guide type multi-stage pressure-reduction high-pressure angle valve |
| CN104455469A (en) * | 2014-09-29 | 2015-03-25 | 北京航天动力研究所 | Throttling serial type multistage pressure reduction and adjustment valve |
| CN205578757U (en) * | 2015-10-28 | 2016-09-14 | 无锡斯考尔自动控制设备有限公司 | Multi stage decompression high pressure angle valve |
| CN206190934U (en) * | 2016-11-24 | 2017-05-24 | 吴忠中创自控阀有限公司 | Multi -functional super high pressure isolating valve |
| CN206309972U (en) * | 2016-12-19 | 2017-07-07 | 天津精通控制仪表技术有限公司 | A kind of Cascade Multistage decompression high-differential-pressure regulating valve |
| CN206816887U (en) * | 2017-06-09 | 2017-12-29 | 西安希佛隆阀门有限公司 | A kind of HTHP difference tandem balanced type regulating valve |
| CN209245439U (en) * | 2018-12-29 | 2019-08-13 | 吴忠仪表有限责任公司 | Pressure balance type high-precision high voltage difference control valve |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111779867A (en) * | 2020-08-03 | 2020-10-16 | 焦彪彪 | Vibration suppression pressure reducing valve |
| CN111779867B (en) * | 2020-08-03 | 2021-12-28 | 浙江东辰阀门科技有限公司 | Vibration suppression pressure reducing valve |
| CN113108070A (en) * | 2021-05-08 | 2021-07-13 | 浙江理工大学 | Multistage pressure reduction string type liquid level regulating valve structure |
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