CN106369200B - A kind of gas spring overflow valve - Google Patents
A kind of gas spring overflow valve Download PDFInfo
- Publication number
- CN106369200B CN106369200B CN201610957087.0A CN201610957087A CN106369200B CN 106369200 B CN106369200 B CN 106369200B CN 201610957087 A CN201610957087 A CN 201610957087A CN 106369200 B CN106369200 B CN 106369200B
- Authority
- CN
- China
- Prior art keywords
- valve
- piston
- gas spring
- spool
- chamber
- 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.)
- Active
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
- F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
- F16K17/32—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting on a servo-mechanism or on a catch-releasing mechanism
-
- 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
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
- F15B20/005—Leakage; Spillage; Hose burst
Abstract
The invention discloses a kind of gas spring overflow valve, which includes stop nut, piston push rod, piston, spring, spool, valve pocket, valve seat, valve body, piston/cylinder etc..In the present invention, the setting of gas spring upper and lower end parts differs larger piston there are two diameter, and the big piston positioned at upper end is for quickly establishing the pressure inside gas spring；Valve piston positioned at lower end is connected to relief valve spool, is used for relief valve spool thrust output；Valve piston diameter very little, thus caused gas spring internal volume variable quantity very little in spool opening process, gas spring internal pressure can remain constant substantially, i.e., in spool opening process, gas spring can remain constant to the thrust of spool.This gas spring overflow valve efficiently solves the problems, such as that traditional indirect detection formula relief valve pressure regulating deviation is big using cleverly structure design.
Description
Technical field
The present invention relates to a kind of gas spring overflow valves, belong to electrichydraulic control field.
Background technology
The operating pressure of overflow valve is arranged by the pre compressed magnitude of setting pressure spring in traditional direct-acting overflow valve, with
The increase of excess flow, overflow valve valve port opening gradually increases, i.e. relief valve spool displacement gradually increases, pressure spring by into
One step is compressed, and the spring force acted on spool increases, therefore overflow valve inlet pressure increases with the increase of excess flow,
So that larger override pressure occurs in overflow valve, overflow valve performance is had adverse effect on.Relative to direct-acting overflow valve,
The override pressure of traditional indirect detection type pilot operated compound relief valve is smaller, generally 15% or so, but still remains larger inclined
Difference.
During traditional overflow valve carries out oil pressure relief setting, needs to open hydraulic system, be set with monitoring overflow in real time
The size of constant-pressure.During carrying out overflow valve pressure setting, hydraulic system is often operated in high-pressure high-flow operating mode, this is not
But the service life of hydraulic system is affected, the waste of the energy can be also caused.
In consideration of it, the present inventor carries out in-depth study to the above problem, there is this case generation then.
Invention content
The purpose of the present invention is to provide a kind of gas spring overflow valves that can reduce override pressure.
In order to achieve the above object, the present invention uses such technical solution：
A kind of gas spring overflow valve, including valve seat, be arranged in valve seat valve chamber, be arranged in valve chamber valve pocket, can
It slides the spool that is disposed in valve pocket and supports the elastic top-pressure mechanism on spool, be equipped on valve seat and to be connected to valve chamber
Oil inlet and oil outlet, elastic top-pressure mechanism include cylinder body, the first valve body, the second valve body, the first piston being arranged in cylinder body,
The elastic component that is arranged between first piston and the second valve body, is opened at the first piston push rod being arranged on the first valve body
Second piston in sliding slot of sliding slot on two valve bodies, cooperation and the second piston push rod being arranged in sliding slot, the one of sliding slot
The inner cavity connection of end elastic component corresponding with cylinder body, the other end of sliding slot are connected to valve chamber, and one end setting of second piston push rod exists
In sliding slot, the other end is supported on spool, and second piston push rod is arranged in a manner of it can move along the axial cylinder in the second valve body
On, the both ends of spool in an axial direction are set to first end and second end, and first end corresponds to the setting of second piston push rod, second end pair
Oil inlet is answered to be arranged, valve chamber corresponds to the first end and the second end is respectively equipped with first chamber and second chamber, further includes
One end of first oil circuit, the first oil circuit is connected to first chamber, and the other end of the first oil circuit is connected to second chamber, and spool is in institute
The area of the circumferential cross-section of first end is stated less than the area of the circumferential cross-section in the second end, the area of section of sliding slot circumferentially
Less than the area in inner chamber of cylinder block circumferentially section.
As a kind of preferred embodiment of the present invention, first valve body is equipped with the first axis hole and bolt being mutually linked
Hole is equipped with adjusting bolt in bolt hole, is arranged with stop nut in adjusting bolt, and the first piston push rod is with can be along first
The mode of axis hole axial movement is plugged in the first axis hole, and one end of the first piston push rod is supported in the first piston
On, the other end is supported in adjusting bolt.
As the present invention a kind of preferred embodiment, first valve body be equipped with the first venthole, the one of the first venthole
End is connected to the cylinder body, and the other end is connected to outside air.
As a kind of preferred embodiment of the present invention, the elastic component is spring.
As a kind of preferred embodiment of the present invention, first valve body screw thread is connected to one end of the cylinder body, and described the
Two valve body screw threads are connected to the other end of the cylinder body, and second valve body is bolted on the valve seat.
As a kind of preferred embodiment of the present invention, it is long-range that the cylinder body corresponds to the area of section of the inner cavity of elastic component circumferentially
In the area of section of the sliding slot circumferentially.
As a kind of preferred embodiment of the present invention, sealing ring is equipped between the first piston and the inner wall of the cylinder body,
It is equipped with sealing ring between the second piston and the inner wall of the sliding slot, is equipped between the valve pocket and the side wall of the valve chamber close
The second end of seal, the spool is equipped with annular boss.
As a kind of preferred embodiment of the present invention, the sliding slot is separated into upper chamber and lower chambers by the second piston,
Further include the second oil circuit, one end of the second oil circuit is connected to the oil outlet, and the other end is connected to lower chambers.
As a kind of preferred embodiment of the present invention, the side wall of the spool is equipped with balancing slit.
As a kind of preferred embodiment of the present invention, the side wall of the cylinder body is equipped with inflation pressure tap, inflates pressure tap from institute
The inner wall for stating cylinder body is through to outer wall, and inflation pressure tap is arranged between the first piston and second valve body.
After technical solution using the present invention, pass through the setting of first piston and second piston relative size, overflow valve valve
When mouth is opened, the pressure variations influence that spool opens the inner cavity that cylinder body is arranged elastic component in the volume change generated is smaller, elimination
The override pressure of overflow valve.
Further pressure tap is inflated in setting to the present invention on cylinder body, can measure the interior of cylinder body setting elastic component in real time
The pressure of chamber, therefore the present invention under the premise of not opening oil supply system, can know the setting pressure of overflow valve.
Description of the drawings
Attached drawing 1 is the diagrammatic cross-section of the present invention；
Attached drawing 2 is spool of the present invention and valve pocket schematic diagram；
Description of drawing identification：
1, stop nut 2, first piston push rod
3, first piston 4, spring
5, second piston 5.1, second piston air seal circle mounting groove
6, second piston push rod 6.1, second piston push rod rounded ends
7, spool 7.1, annular flange
7.2, balancing slit 8, valve pocket
8.1, oil outlet 8.2, oil inlet
8.3, sealing ring mounting groove 9, valve seat
9.3, valve chamber 9.31, first chamber
9.32, second chamber 10, the second valve body
10.1,10.2 first oil circuit of first chamber
10.3, the second oil circuit 10.4, second chamber
10.5, sliding slot 11, cylinder body
11.1, inflation pressure tap 11.2, cylinder body correspond to the inner cavity of elastic component
12, the first valve body 12.1, the first venthole
13, adjusting bolt
Specific implementation mode
In order to further explain the technical solution of the present invention, being described in detail below in conjunction with the accompanying drawings.
Referring to Figures 1 and 2, a kind of gas spring overflow valve, including valve seat 9, the valve chamber 9.3 being arranged in valve seat 9, setting
Valve pocket 8 in valve chamber 9.3, the spool 7 being slidably disposed in valve pocket 8 and the elastic top-pressure mechanism on spool 7 is supported,
The oil inlet 8.2 being connected to valve chamber 9.3 and oil outlet 8.1 are equipped on valve seat 9, when oil inlet 8.2 is more than setting value, fluid
Spool 7 is jacked up, fluid is flowed out from oil outlet 8.1.
In the present invention, elastic top-pressure mechanism includes cylinder body 11, the first valve body 12, the second valve body 10, is arranged in cylinder body 11
First piston 3, be arranged between first piston 3 and the second valve body 10 elastic component, be arranged on the first valve body 12 first
The second piston 5 and setting of piston push rod 2, the sliding slot 10.5 being opened on the second valve body 10, cooperation in sliding slot 10.5 exist
Second piston push rod 6 in sliding slot 10.5, sliding slot 10.5 are arranged along the axial direction of the second valve body 10, one end of sliding slot 10.5 and cylinder body
The inner cavity 11.2 of corresponding elastic component is connected to, and the other end of sliding slot 10.5 is connected to valve chamber 9.3.One end of second piston push rod 6 is set
It sets in sliding slot 10.5, the other end is supported on spool 7, and second piston push rod 6 is in a manner of can be along the axial movement of sliding slot 10.5
It is arranged on the second valve body 10.The both ends of spool 7 in an axial direction are set to first end 7.3 and second end 7.4, and first end 7.3 is right
Second piston push rod 6 is answered to be arranged, second end 7.4 corresponds to oil inlet 8.2 and is arranged, and valve chamber 9.3 corresponds to the first end 7.3 and described
Second end 7.4 is respectively equipped with first chamber 10.1 and second chamber 10.4, further includes the first oil circuit 10.2, the first oil circuit 10.2
One end is connected to first chamber 10.1, and the other end of the first oil circuit 10.2 is connected to second chamber 10.4, in force, the first oil
10.2 part of road is opened in valve seat 9, is partly opened in the second valve body 10.In the present invention, spool 7 is in the first end 7.3
Circumferential cross-section area be less than the second end 7.4 circumferential cross-section area, the area of section of sliding slot 10.5 circumferentially
Less than the area that cylinder body corresponds to the inner cavity 11.2 of elastic component circumferentially section, so that the circumferential cross-section area of first piston 3
More than 5 circumferential cross-section area of second piston.
As a kind of preferred embodiment of the present invention, first valve body 12 is equipped with the first axis hole and bolt being mutually linked
Hole is equipped with adjusting bolt 13 in bolt hole, is arranged with stop nut 1 in adjusting bolt 13, and the first piston push rod 2 is with can
Mode along the axial movement of first axle hole is plugged in the first axis hole, and one end of the first piston push rod 2 is supported described the
On one piston 3, the other end is supported in adjusting bolt 13.
As a kind of preferred embodiment of the present invention, first valve body 12 is equipped with the first venthole 12.1, the first ventilation
The one end in hole 12.1 is connected to cylinder body 11 and (is specifically connected to the inner cavity that spring is not arranged for cylinder body), and the other end is connected to extraneous sky
Gas.
As a kind of preferred embodiment of the present invention, the elastic component.It is preferable that second piston bar 6 is pushed away with second piston
Bar rounded ends 6.1, the second piston push rod rounded ends 6.1 are supported on spool 7.
As a kind of preferred embodiment of the present invention, first valve body 12 is threaded in one end of the cylinder body 11, institute
The other end that the second valve body 10 is threaded in the cylinder body 11 is stated, second valve body 10 is bolted in the valve seat
On 9.
As a kind of preferred embodiment of the present invention, the cylinder body corresponds to the area of section of the inner cavity 11.2 of elastic component circumferentially
Much larger than the area of section of the sliding slot 10.5 circumferentially so that first piston 3 and the outer diameter of second piston 5 have it is larger
Gap, those skilled in the art can be accordingly arranged according to actual conditions.
As a kind of preferred embodiment of the present invention, sealing is equipped between the first piston 3 and the inner wall of the cylinder body 11
Circle is equipped with sealing ring, second is correspondingly provided in second piston 5 between the second piston 5 and the inner wall of the sliding slot 10.5
Piston gas sealing ring mounting groove 5.1 is installing sealing ring.It is equipped between the valve pocket 8 and the side wall of the valve chamber 9.3 close
Seal, correspondence opens up sealing ring mounting groove 8.3 to install sealing ring on valve pocket 8.In the present invention, the second of the spool 7
End 7.4 is equipped with annular boss 7.1, so that the area A of second end 7.41More than the area A of first end2。
As a kind of preferred embodiment of the present invention, the sliding slot 10.5 is separated into upper chamber under by the second piston 5
Chamber further includes the second oil circuit 10.3, and one end of the second oil circuit 10.3 is connected to the oil outlet 8.1, the other end and lower chambers
Connection.
As a kind of preferred embodiment of the present invention, the side wall of the spool 7 is equipped with balancing slit 7.2.
As a kind of preferred embodiment of the present invention, the side wall of the cylinder body 11 is equipped with inflation pressure tap 11.1, inflates pressure measurement
Mouthfuls 11.1 are through to outer wall from the inner wall of the cylinder body 11, and the setting of inflation pressure tap 11.1 is in the first piston 3 and described the
Between two valve bodies 10.
The concrete operating principle of the present invention is as follows：
Inflation：Before inflation, turn adjusting bolt 13 counterclockwise, first piston 3 is under the action of spring 4 to moving up
It is dynamic, gas spring compression chamber (i.e. cylinder body corresponds to the inner cavity 11.2 of elastic component) volume increase；After the completion of inflation, in inflation pressure tap
11.1 installation pressure measurement meter connectors can connect pressure gauge to gas spring compression cavity pressure P3It is measured in real time.
Pressure regulation：Turn adjusting bolt 13 clockwise, adjusting bolt 13 pushes first piston push rod 2 and moves downward, and first lives
Plug push rod 2 heads on first piston 3 and moves downward, and in the process, gas spring compression chamber volume tapers into, pressure P3Gradually
It increases, P can be observed by inflating the pressure gauge installed at pressure tap 11.13Numerical value.7 lower end of spool is provided with cyclic annular convex
Platform 7.1,7 upper surface area of spool are set as A2, lower surface area is set as A1, A1＞ A2.Oil inlet 8.2 passes through the first oil circuit
10.2 communicate with the first chamber 10.1 of spool 7, therefore active area of the high pressure oil at oil inlet 8.2 on spool 7 is A1-
A2, design the face area A of second piston 53=A1-A2, then relief valve set pressure be equal to gas spring compression chamber pressure P3,
To realize not open that hydraulic oil source can know the setting pressure of regulation relief valve in real time.
Overflow valve works：As 8.2 pressure P of overflow valve oil inlet1More than setting pressure P3When, overflow valve valve port is opened, if overflowing
Stream 7 maximum displacement of valve core is h, then gas spring compression chamber 11.2 is A because of the volume change that spool 7 is opened and generates3*h；
Designed 5 diameter of second piston is small-sized for entire overflow valve, 7 maximum displacement of relief valve spool be also one compared with
Small numerical value, therefore a larger gas spring compression chamber volume can be designed, it allows because spool 7 opens the volume change generated
The pressure change of caused gas spring compression chamber reaches negligible degree.Therefore the P in 7 opening process of spool3
It keeps constant, has effectively eliminated the override pressure of overflow valve.
In the present invention, the setting of gas spring upper and lower end parts differs larger piston there are two diameter, is located at the big of upper end
Piston is used to quickly establish the pressure inside gas spring；Valve piston positioned at lower end is connected to relief valve spool, for
Relief valve spool thrust output；Valve piston diameter very little, thus caused gas spring internal volume becomes in spool opening process
Change amount very little, gas spring internal pressure can remain constant substantially, i.e., in spool opening process, gas spring pushes away spool
Power can remain constant.This gas spring overflow valve efficiently solves traditional indirect detection using cleverly structure design
The big problem of formula relief valve pressure regulating deviation.
The product form of the present invention is not limited to this case diagram and embodiment, anyone carries out it the appropriate of similar thinking
Changes or modifications all should be regarded as the patent category for not departing from the present invention.
Claims (10)
1. a kind of gas spring overflow valve, including valve seat, be arranged in valve seat valve chamber, be arranged in valve chamber valve pocket, can slide
The dynamic spool being disposed in valve pocket and support the elastic top-pressure mechanism on spool, be equipped on valve seat be connected to valve chamber into
Hydraulic fluid port and oil outlet, it is characterised in that：Elastic top-pressure mechanism includes cylinder body, the first valve body, the second valve body, is arranged in cylinder body
First piston, the elastic component being arranged between first piston and the second valve body, the first piston push rod being arranged on the first valve body,
The sliding slot being opened on the second valve body, the second piston push rod for coordinating the second piston in sliding slot and being arranged in sliding slot,
The inner cavity of one end of sliding slot elastic component corresponding with cylinder body is connected to, and the other end of sliding slot is connected to valve chamber, and the one of second piston push rod
End is arranged in sliding slot, and the other end is supported on spool, and second piston push rod is arranged in a manner of it can move along the axial cylinder
On second valve body, the both ends of spool in an axial direction are set to first end and second end, and first end corresponds to the setting of second piston push rod,
Second end corresponds to oil inlet setting, and valve chamber corresponds to the first end and is equipped with first chamber, and valve chamber corresponds to the second end equipped with the
Two chambers further include the first oil circuit, and one end of the first oil circuit is connected to first chamber, the other end and second chamber of the first oil circuit
Connection, spool are less than the area in the circumferential cross-section of the second end, sliding slot edge in the area of the circumferential cross-section of the first end
Circumferential area of section is less than the area in inner chamber of cylinder block circumferentially section.
2. a kind of gas spring overflow valve as described in claim 1, it is characterised in that：First valve body is equipped with mutually rank
The first axis hole and bolt hole connect is equipped with adjusting bolt in bolt hole, is arranged with stop nut in adjusting bolt, and described first
Piston push rod is plugged in a manner of it can be moved axially along first axle hole in the first axis hole, and one end of the first piston push rod is supported
It withstands on the first piston, the other end is supported in adjusting bolt.
3. a kind of gas spring overflow valve as claimed in claim 2, it is characterised in that：It is logical that first valve body is equipped with first
Stomata, one end of the first venthole are connected to the cylinder body, and the other end is connected to outside air.
4. a kind of gas spring overflow valve as described in claim 1, it is characterised in that：The elastic component is spring.
5. a kind of gas spring overflow valve as described in claim 1, it is characterised in that：First valve body screw thread is connected to institute
One end of cylinder body is stated, second valve body screw thread is connected to the other end of the cylinder body, and second valve body is bolted
On the valve seat.
6. a kind of gas spring overflow valve as described in claim 1, it is characterised in that：The cylinder body corresponds to the inner cavity of elastic component
Area of section circumferentially is much larger than the area of section of the sliding slot circumferentially.
7. a kind of gas spring overflow valve as described in claim 1, it is characterised in that：The first piston and the cylinder body
Between inner wall be equipped with sealing ring, between the second piston and the inner wall of the sliding slot be equipped with sealing ring, the valve pocket with it is described
Sealing ring is equipped between the side wall of valve chamber, the second end of the spool is equipped with annular boss.
8. a kind of gas spring overflow valve as described in claim 1, it is characterised in that：The second piston divides the sliding slot
It is divided into upper chamber and lower chambers, further includes the second oil circuit, one end of the second oil circuit is connected to the oil outlet, the other end and cavity of resorption
Room is connected to.
9. a kind of gas spring overflow valve as described in claim 1, it is characterised in that：The side wall of the spool is equipped with and presses
Slot.
10. a kind of gas spring overflow valve as described in any one of claim 1 to 9, it is characterised in that：The side wall of the cylinder body
Equipped with inflation pressure tap, inflation pressure tap is through to outer wall from the inner wall of the cylinder body, and inflation pressure tap is arranged described first
Between piston and second valve body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610957087.0A CN106369200B (en) | 2016-11-03 | 2016-11-03 | A kind of gas spring overflow valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610957087.0A CN106369200B (en) | 2016-11-03 | 2016-11-03 | A kind of gas spring overflow valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106369200A CN106369200A (en) | 2017-02-01 |
| CN106369200B true CN106369200B (en) | 2018-07-20 |
Family
ID=57892918
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610957087.0A Active CN106369200B (en) | 2016-11-03 | 2016-11-03 | A kind of gas spring overflow valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106369200B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107725814B (en) * | 2017-11-10 | 2023-07-04 | 宁波新佳行自动化工业有限公司 | Switch controllable joint |
| CN109236781B (en) * | 2018-11-14 | 2023-07-21 | 浙江丰州精密制造有限公司 | Time sequence valve |
| CN111795033B (en) * | 2020-07-16 | 2022-06-24 | 中车青岛四方车辆研究所有限公司 | Direct-acting overflow valve |
| CN113217497B (en) * | 2021-05-24 | 2023-11-21 | 西安航天远征流体控制股份有限公司 | Plug-in type energy storage overflow valve |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1550305A1 (en) * | 1966-08-12 | 1969-09-25 | Hymate Ges Fuer Hydraul Automa | Hydraulic amplifier device |
| DE19605895C2 (en) * | 1996-02-17 | 1999-06-02 | Festo Ag & Co | Throttle device compensated for pressure force |
| DE102009053635A1 (en) * | 2009-11-17 | 2011-05-19 | Robert Bosch Gmbh | Pilot operated pressure relief valve |
| CN202091583U (en) * | 2011-05-20 | 2011-12-28 | 彭国军 | Overflow relief valve |
| CN103233936B (en) * | 2013-04-28 | 2016-01-20 | 华侨大学 | A kind of leading type electricity liquid ratio relief valve based on plug-in mounting structure |
| CN103615424B (en) * | 2013-12-09 | 2015-12-30 | 怀特(中国)驱动产品有限公司 | Direct moving type hydraulic thread cartridge buffer overflow valve |
| CN104633233B (en) * | 2015-02-11 | 2017-10-20 | 华侨大学 | A kind of overflow valve using magnetorheological pilot valve |
| CN105909584B (en) * | 2016-03-02 | 2017-12-05 | 杭州力龙液压有限公司 | Buffer relief valve |
-
2016
- 2016-11-03 CN CN201610957087.0A patent/CN106369200B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN106369200A (en) | 2017-02-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106369200B (en) | A kind of gas spring overflow valve | |
| US3578014A (en) | Pressure regulator for pressurized-fluid circuits | |
| CN201228792Y (en) | Pneumatic air pressure reducing valve | |
| US10197053B2 (en) | Turn-back coaxial gas pressurizing pump and gas pressurizing method | |
| CN107061834B (en) | Built-in driving axial-flow type regulating valve | |
| CN105673900A (en) | Air reducing valve used for ships | |
| CN102287412A (en) | Ultra-high pressure proportional relief valve | |
| CN101245861B (en) | Non-leakage flat gate valve | |
| CN103291986A (en) | Directly-operated type reducing valve | |
| CN103758816A (en) | Integration series connection cylinder with adjustable stroke | |
| CN102147027A (en) | Adjustable pressure-relieving/holding valve | |
| CN206478275U (en) | A kind of automatic constant-pressure type pressure-reducing valve | |
| CN100480558C (en) | Movable vacuum apparatus | |
| CN202251175U (en) | Extra-high-pressure bidirectional hydraulic lock | |
| CN102155373B (en) | Pneumatically-controlled variable reciprocating pump | |
| CN201386841Y (en) | Tube-type back pressure valve | |
| CN110513344A (en) | Big flow inflatable overflow valve suitable for emulsion power pack system | |
| CN205781164U (en) | Highly sensitive self balance valve core assembly | |
| CN204879017U (en) | Be applied to pressure regulator that outlet pressure adjusted on gas pressure governing valve | |
| CN107120321A (en) | A kind of power saving energy accumulator | |
| CN206943557U (en) | A kind of superposing type high thrust pneumatic actuator | |
| CN106884817A (en) | One kind can accurate pressure control accumulator | |
| CN206655855U (en) | A kind of inverse-proportion pressure reducing valve of hydraulic coupling control | |
| CN113431904B (en) | Fluid valve integrating opening and closing functions with overflow functions | |
| CN105864441B (en) | A kind of dropping equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |