CN104454725B - A kind of reversing valve core - Google Patents
A kind of reversing valve core Download PDFInfo
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- CN104454725B CN104454725B CN201410657208.0A CN201410657208A CN104454725B CN 104454725 B CN104454725 B CN 104454725B CN 201410657208 A CN201410657208 A CN 201410657208A CN 104454725 B CN104454725 B CN 104454725B
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- annular groove
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- valve rod
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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
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Multiple-Way Valves (AREA)
Abstract
The invention discloses a kind of reversing valve core, including valve pocket and valve rod, valve rod is positioned at valve pocket and is coaxially disposed with valve pocket, valve rod front portion is axially disposed the first cavity, valve rod rear portion is axially disposed the second cavity, the connecting hole connected with the first cavity it is provided with in valve rod, valve pocket front end is provided with the elasticity reset device stretched in the first cavity, valve pocket rear end is provided with the Handleset stretched in the second cavity, elasticity reset device is internal to be connected with the first cavity, the communication groove of annular it is provided with on valve rod outer wall, pressure oil port it is sequentially arranged at intervals with from front to back on valve pocket, first actuator port, second actuator port and control hydraulic fluid port；Advantage is to be provided simultaneously with surge commutation function and manual reverse of direction function, can manually commutation function normally work when commutation function of surging breaks down, and in this reversing valve core valve rod axially will not be by the resistance of hydraulic oil, it is only necessary to less power can realize manual reverse of direction, uses easy to operate.
Description
Technical field
The present invention relates to a kind of spool, especially relate to a kind of reversing valve core.
Background technology
Existing reversing valve core generally includes two kinds: fluid pressure type reversing valve core and manual type reversing valve core.Fluid pressure type reversal valve
Core generally includes valve pocket and is positioned at valve pocket and the valve rod being coaxially disposed with valve pocket, and one end of valve pocket is provided with actuator port,
The other end of valve pocket is provided with control hydraulic fluid port, and sleeve side wall is provided with pressure oil port and returns liquid hydraulic fluid port, wherein returns liquid hydraulic fluid port close
Control hydraulic fluid port, pressure oil port is axially disposed in actuator port, valve rod the oil inlet passage connected with actuator port, valve
The opening connected with oil inlet passage it is provided with on bar；When original state, the opening on valve rod is by oil inlet passage and returns liquid oil
Mouthful connection, actuator port and return liquid hydraulic fluid port be in connected state, now, pressure oil port and control hydraulic fluid port in input hydraulic pressure oil,
Valve rod is promoted by the hydraulic oil in control hydraulic fluid port to actuator port direction, and the opening on valve rod disconnects with returning liquid hydraulic fluid port, working oil
Mouth and time liquid hydraulic fluid port are in isolation, and when the opening on valve rod moves to pressure oil port, the opening on valve rod will pressure
Power hydraulic fluid port connects with actuator port.Manual type reversing valve core is essentially identical with the structure of fluid pressure type reversing valve core, and difference only exists
In manual type reversing valve core arrange Handleset replace control hydraulic fluid port to drive valve rod, Handleset promote valve rod pressure oil port and
The connection of actuator port.
But, in above-mentioned fluid pressure type reversing valve core, when controlling hydraulic fluid port and breaking down, fluid pressure type reversing valve core will be unable to normally
Work；Owing to there is hydraulic oil in the oil inlet passage in valve rod in above-mentioned manual type reversing valve core, when Handleset promotes valve
During bar, by by from the resistance of hydraulic oil in oil inlet passage, need bigger strength to overcome resistance, use operation not
Just.
Summary of the invention
The technical problem to be solved is to provide a kind of be provided simultaneously with surging commutation function and manual reverse of direction function
Reversing valve core, this reversing valve core can manually commutation function normally work when commutation function of surging breaks down, and should
In reversing valve core, valve rod is axially will not be by the resistance of hydraulic oil, it is only necessary to less power can realize manual reverse of direction, uses
Easy to operate.
The present invention solves the technical scheme that above-mentioned technical problem used: a kind of reversing valve core, including valve pocket and valve rod,
Described valve rod is positioned at described valve pocket and is coaxially disposed with described valve pocket, it is characterised in that described edge, valve rod front portion
Axially arranged have the first cavity, and described valve rod rear portion is axially disposed the second cavity, be provided with in described valve rod with
The connecting hole of the first described cavity connection, it is multiple that described valve pocket front end is provided with the elasticity stretched in the first described cavity
Position device, described valve pocket rear end is provided with the Handleset stretched in the second described cavity, described elastic reset dress
Put the first internal with described cavity to connect, described valve rod outer wall is provided with the communication groove of annular, described valve pocket
On be sequentially arranged at intervals with from front to back pressure oil port, the first actuator port, the second actuator port and control hydraulic fluid port, when described
Spool when being in zero-bit state, described connecting hole connects with the second described actuator port, the first described working oil
Mouth connects with described communication groove, and when being passed through hydraulic oil in described control hydraulic fluid port, described valve rod is towards described valve pocket
Front end moves axially, and described elasticity reset device is compressed, and in moving process, first described connecting hole is with described
The second actuator port disconnect, then described communication groove moves described pressure oil port to described pressure oil port
Connecting with the first described actuator port, now described spool enters duty.
Described elasticity reset device includes spring base, spring housing and the set being fixedly mounted at the front port of described valve pocket
Being located at the spring on described spring housing, described spring housing is fixed in described spring base and extends to described first
In cavity, there is between the bottom of described spring housing and the first described cavity a segment distance, one end of described spring
Fixing with described spring base and be connected, the other end of described spring contacts with the bottom of the first described cavity, described
Being provided with liquid return hole on spring base, described liquid return hole connects with the first described cavity by described spring housing is internal.
Be sequentially arranged at intervals with from front to back on the outer wall of described valve rod first annular groove, the second annular groove, the 3rd
Annular groove, fourth annular groove, the 5th annular groove and the 6th annular groove, arranged in described first annular groove
There is the first sealing ring, in the second described annular groove, be provided with the second sealing ring, arrange in the 3rd described annular groove
There is the 3rd sealing ring, in described fourth annular groove, be provided with the 4th sealing ring, arrange in the 5th described annular groove
Having the 5th sealing ring, be provided with the 6th sealing ring in the 6th described annular groove, described communication groove is positioned at described
Between second annular groove and the 3rd described annular groove, described connecting hole is positioned at the 3rd described annular groove and institute
Between the fourth annular groove stated, when described spool is in zero-bit state, described pressure oil port is positioned at described
Between one annular groove and the second described annular groove, described control hydraulic fluid port is positioned at the 5th described annular groove and described
The 6th annular groove between, when described spool enters duty, the 3rd described annular groove and described the
Four annular grooves between the first described actuator port and the second described actuator port, the second described actuator port
Between described fourth annular groove and the 5th described annular groove, the 5th described annular groove is positioned at described
Between second actuator port and described control hydraulic fluid port, described control hydraulic fluid port is positioned at the 5th described annular groove and described the
Between six annular grooves.This structure ensures at the connecting hole of spool, control hydraulic fluid port, pressure oil port, the first actuator port and the
The positive confinement when cut-off of two actuator ports, prevents leakage of oil.
The 7th annular groove, the 8th annular groove, the 9th annular groove and bull's eye it is provided with on the outer wall of described valve pocket
Connected in star, the 7th described annular groove, the 8th described annular groove, the 9th described annular groove and described
Being respectively arranged with a sealing ring and a back-up ring in ten annular grooves, described pressure oil port is positioned at the 7th described annular
Between groove and the 8th described annular groove, the first described actuator port and the second described actuator port are positioned at described
The 8th annular groove and the 9th described annular groove between, described control hydraulic fluid port be positioned at the 9th described annular groove and
Between the tenth described annular groove.This structure ensures in commutation process, the positive confinement between valve pocket and external devices
Described Handleset includes that handle and pressure head, described handle are connected by bearing pin with the afterbody of described pressure head,
The front portion of described pressure head is stretched in the second described cavity, when described spool is in zero-bit state, described in rotation
Handle, the valve rod that described pressure head moves forward described in promotion is advanced into duty.
Compared with prior art, it is an advantage of the current invention that by axially disposed having the first cavity, valve rod valve rod is anterior
Rear portion is axially disposed the second cavity, is provided with the connecting hole connected with the first cavity in valve rod, and valve pocket front end is provided with
Stretching into the elasticity reset device in the first cavity, valve pocket rear end is provided with the Handleset stretched in the second cavity, elastic multiple
Position device is internal to be connected with the first cavity, valve rod outer wall is provided with the communication groove of annular, on valve pocket the most successively
It is arranged at intervals with pressure oil port, the first actuator port, the second actuator port and control hydraulic fluid port, when spool is in zero-bit state,
Connecting hole and the connection of the second actuator port, the first actuator port connects with communication groove, when being passed through hydraulic oil in controlling hydraulic fluid port,
Valve rod moves axially towards valve pocket front end, and elasticity reset device is compressed, in moving process, and first connecting hole and the second work
Making hydraulic fluid port to disconnect, then communication groove moves to pressure oil port and pressure oil port is connected with the first actuator port, now valve
Core enters duty, is achieved in commutation function of surging, and in the commutation process that surges, pressure oil port and the first work
The communication groove that connects through made between hydraulic fluid port realizes, and valve rod balances at axially loaded, and will not be under pressure oil port hydraulic pressure
The resistance of oil, the power being applied to valve rod only needs the elastic force overcoming elasticity reset device can realize the movement of valve rod, control oil
Input less amount of hydraulic oil at Kou and can promote valve rod, saving oil mass；When spool is in zero-bit state, rotate hands
Handle assembly, Handleset promotes valve rod to be advanced into duty, it is achieved manual reverse of direction function, the thus present invention
Spool is provided simultaneously with surge commutation function and manual reverse of direction function, and during manual reverse of direction, due to pressure oil port and
The communication groove that connects through between first actuator port realizes, and valve rod balances at axially loaded, and will not be under pressure hydraulic fluid port
The resistance of place's hydraulic oil, the power being applied to valve rod only needs the elastic force overcoming elasticity reset device can realize the shifting of valve rod
Dynamic, it is only necessary to less power can realize manual reverse of direction, uses easy to operate.
Accompanying drawing explanation
Fig. 1 is the spool of the present invention sectional view when zero-bit state；
Fig. 2 be the present invention spool in working order time sectional view.
Detailed description of the invention
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
Embodiment: a kind of reversing valve core, including valve pocket 1 and valve rod 2, valve rod 2 is positioned at valve pocket 1 and with valve pocket 1 together
Axle is arranged, and valve rod 1 front portion is axially disposed the first cavity 3, and valve rod 1 rear portion is axially disposed the second cavity 4,
Being provided with the connecting hole 5 connected with the first cavity 3 in valve rod 1, valve pocket 1 front end is provided with to be stretched in the first cavity 3
Elasticity reset device, valve pocket 1 rear end is provided with the Handleset stretched in the second cavity 4, elasticity reset device internal with
First cavity 3 connects, and valve rod 2 outer wall is provided with the communication groove 6 of annular, valve pocket 1 is spaced the most successively
It is provided with pressure oil port P, the first actuator port A1, the second actuator port A2 and control hydraulic fluid port K, when spool is in zero-bit
During state, connecting hole 5 connects with the second actuator port A2, and the first actuator port A1 connects with communication groove 6, when
When being passed through hydraulic oil in control hydraulic fluid port K, valve rod 2 moves axially towards valve pocket 1 front end, and elasticity reset device is compressed, and is moving
During Dong, first connecting hole 5 and the second actuator port A2 disconnects, and then communication groove 6 moves to pressure oil port P
Pressure oil port is connected by place with the first actuator port A1, and now spool enters duty.
In the present embodiment, elasticity reset device includes being fixedly mounted on the spring base 7 at the front port of valve pocket 1, spring housing
8 and the spring 9 that is set on spring housing 8, in spring housing 8 is fixed on spring base 7 and extend in the first cavity 3,
Having a segment distance between spring housing 8 and the bottom of the first cavity 3, one end of spring 9 is fixing with spring base 7 to be connected,
The other end of spring 9 and the bottom contact of the first cavity 3, spring base 7 is provided with liquid return hole T, liquid return hole T and passes through
Spring housing 8 is internal to be connected with the first cavity 3.
In the present embodiment, the outer wall of valve rod 2 is sequentially arranged at intervals with from front to back first annular groove, second annular recessed
Groove, the 3rd annular groove, fourth annular groove, the 5th annular groove and the 6th annular groove, set in first annular groove
It is equipped with the first sealing ring 10, in the second annular groove, is provided with the second sealing ring 11, in the 3rd annular groove, be provided with
Three sealing rings 12, are provided with the 4th sealing ring 13, are provided with the 5th sealing in the 5th annular groove in fourth annular groove
Circle 14, is provided with the 6th sealing ring 15 in the 6th annular groove, communication groove 6 is positioned at the second annular groove and the 3rd ring
Between connected in star, connecting hole 5 is between the 3rd annular groove and fourth annular groove, when spool is in zero-bit state,
Pressure oil port P is between first annular groove and the second annular groove, and control hydraulic fluid port K is positioned at the 5th annular groove and the 6th
Between annular groove, when spool enters duty, the 3rd annular groove and fourth annular groove are positioned at the first working oil
Between mouthful A1 and the second actuator port A2, the second actuator port A2 be positioned at fourth annular groove and the 5th annular groove it
Between, the 5th annular groove is between the second actuator port A2 and control hydraulic fluid port K, and control hydraulic fluid port K is positioned at the 5th annular groove
With the 6th between annular groove.
In the present embodiment, the outer wall of valve pocket 1 is provided with the 7th annular groove the 16, the 8th annular groove the 17, the 9th ring
Connected in star 18 and the tenth annular groove 19, the 7th annular groove the 16, the 8th annular groove the 17, the 9th annular groove 18
Be respectively arranged with a sealing ring and a back-up ring in the tenth annular groove 19, pressure oil port P be positioned at the 7th annular recessed
Between groove 16 and the 8th annular groove 17, it is recessed that the first actuator port A1 and the second actuator port A2 is positioned at the 8th annular
Between groove 17 and the 9th annular groove 18, hydraulic fluid port K is between the 9th annular groove 18 and the tenth annular groove 19 in control.
In the present embodiment, Handleset includes that handle 20 and pressure head 21, handle 20 pass through bearing pin with the afterbody of pressure head 21
22 connect, and the front portion of pressure head 21 is stretched in the second cavity 4, when spool is in zero-bit state, and turning handle 20, pressure
21 move forward promotion valve rod 2 is advanced into duty.
The surge process that realizes of commutation function of the reversing valve core of the present embodiment is: when spool is in zero-bit state, connecting hole 5
Connecting with the second actuator port A2, the first actuator port A1 connects with communication groove 6, to control hydraulic fluid port K and pressure oil
Being passed through hydraulic oil in mouth P, the pressure that valve rod 2 is applied by the hydraulic oil being passed through in control hydraulic fluid port K is more than the elastic force of spring 9,
Valve rod 2 moves axially towards direction, valve pocket 1 front end, and spring 9 is compressed by valve rod 2, in valve rod 2 moving process, first
Connecting hole 5 and the second actuator port A2 disconnect, then communication groove 6 move to pressure oil port P by pressure oil port with
First actuator port A1 connection, the hydraulic oil at pressure oil port P enters the first actuator port A1 and flows to working oil district,
Now spool enters duty；When spool needs to be switched to zero-bit state from duty, stop in control hydraulic fluid port K
Being passed through hydraulic oil, the pressure that valve rod 2 is applied by the elastic force of spring 9 more than hydraulic oil at control hydraulic fluid port K, spring 9 extends
Resetting, valve rod 2 returns to zero duty, and the first actuator port A1 connects with communication groove 6, now connecting hole 5 and
Working oil district is connected by the second actuator port A2 connection with going back to liquid zone, the hydraulic oil flow in working oil district back liquid zone.
The process that realizes of the reversing valve core manual reverse of direction function of the present embodiment is: when spool is in zero-bit state, connecting hole 5
Connecting with the second actuator port A2, the first actuator port A1 connects with communication groove 6, is passed through in pressure oil port P
Hydraulic oil, turning handle 20 applies active force forward to pressure head 21, and this active force acts on valve rod 2 and more than spring
The elastic force of 9, valve rod 2 moves axially towards direction, valve pocket 1 front end, and spring 9 is compressed by valve rod 2, moves at valve rod 2
During, first connecting hole 5 and the second actuator port A2 disconnects, and then communication groove 6 moves to pressure oil port P
Pressure oil port being connected with the first actuator port A1, the hydraulic oil at pressure oil port P enters the first actuator port A1 also
Flowing to working oil district, now spool enters duty；When spool needs to be switched to zero-bit state from duty, pine
Opening handle 20, pressure head 21 no longer acts on valve rod 2, and spring 9 elongation resets, and valve rod 2 returns to zero duty, the
One actuator port A1 connects with communication groove 6, and now connecting hole 5 connects working oil district with the second actuator port A2
Connect with going back to liquid zone, the hydraulic oil flow in working oil district back liquid zone.
In the present embodiment, connect working oil district and pressure oil district by communication groove 6, when zero-bit duty, valve
Mandrel is to stress balance, when commutation function is surged in use, it is only necessary to be passed through a small amount of hydraulic oil at control hydraulic fluid port K, it is ensured that
The axial force that at control hydraulic fluid port K, valve rod 2 is applied by hydraulic oil can realize the shifting of valve rod 2 more than the elastic force of spring 9
Dynamic, save the usage amount of hydraulic oil；When using manual reverse of direction function, it is only necessary to use less strength turning handle 20
The elastic force overcoming spring 9 can realize the movement of valve rod 2, simple to operate, and can use simple in construction and volume relatively
Little handle realizes, cost-effective.
Claims (5)
1. a reversing valve core, including valve pocket and valve rod, described valve rod be positioned at described valve pocket and with described valve pocket
It is coaxially disposed, it is characterised in that described valve rod front portion is axially disposed the first cavity, and described valve rod rear portion is vertically
It is provided with the second cavity, is provided with the connecting hole connected with the first described cavity in described valve rod, before described valve pocket
End is provided with the elasticity reset device stretched in the first described cavity, and described valve pocket rear end is provided with stretches into described the
Handleset in two cavitys, described elasticity reset device is internal to be connected with the first described cavity, outside described valve rod
It is provided with the communication groove of annular on wall, described valve pocket is sequentially arranged at intervals with pressure oil port, the first work from front to back
Making hydraulic fluid port, the second actuator port and control hydraulic fluid port, when described spool is in zero-bit state, described connecting hole is with described
Second actuator port connection, the first described actuator port connects with described communication groove, when in described control hydraulic fluid port
When being passed through hydraulic oil, described valve rod moves axially towards described valve pocket front end, and described elasticity reset device is compressed,
In moving process, first described connecting hole disconnects with the second described actuator port, and then described communication groove is moved
Move to described pressure oil port and described pressure oil port is connected with the first described actuator port, now described spool
Enter duty.
A kind of reversing valve core the most according to claim 1, it is characterised in that described elasticity reset device includes fixing
It is arranged on the spring base at the front port of described valve pocket, spring housing and the spring being set on described spring housing, described
Spring housing be fixed in described spring base and extend in the first described cavity, described spring housing and described the
Having a segment distance between the bottom of one cavity, one end of described spring is fixing with described spring base to be connected, described
The other end of spring contacts with the bottom of the first described cavity, and described spring base is provided with liquid return hole, and described returns
Liquid mouth connects with the first described cavity by described spring housing is internal.
A kind of reversing valve core the most according to claim 1, it is characterised in that on the outer wall of described valve rod from front to back
It is sequentially arranged at intervals with first annular groove, the second annular groove, the 3rd annular groove, fourth annular groove, five rings
Connected in star and the 6th annular groove, be provided with the first sealing ring in described first annular groove, the second described annular is recessed
Being provided with the second sealing ring in groove, be provided with the 3rd sealing ring in the 3rd described annular groove, described fourth annular is recessed
Being provided with the 4th sealing ring in groove, be provided with the 5th sealing ring in the 5th described annular groove, the 6th described annular is recessed
Being provided with the 6th sealing ring in groove, described communication groove is positioned at the second described annular groove and the described the 3rd annular is recessed
Between groove, described connecting hole is between described the 3rd annular groove and described fourth annular groove, when described
When spool is in zero-bit state, described pressure oil port is positioned at described first annular groove and the second described annular groove
Between, described control hydraulic fluid port is between described the 5th annular groove and the 6th described annular groove, when described valve
When core enters duty, the 3rd described annular groove and described fourth annular groove are positioned at the first described working oil
Mouthful and the second described actuator port between, the second described actuator port is positioned at described fourth annular groove and described
Between 5th annular groove, the 5th described annular groove be positioned at the second described actuator port and described control hydraulic fluid port it
Between, described control hydraulic fluid port is between described the 5th annular groove and the 6th described annular groove.
A kind of reversing valve core the most according to claim 1, it is characterised in that be provided with the on the outer wall of described valve pocket
Seven annular grooves, the 8th annular groove, the 9th annular groove and the tenth annular groove, described the 7th annular groove, institute
It is respectively arranged with a sealing in the 8th annular groove stated, the 9th described annular groove and the tenth described annular groove
Circle and a back-up ring, described pressure oil port between described the 7th annular groove and the 8th described annular groove,
The first described actuator port and the second described actuator port are positioned at the 8th described annular groove and the 9th described ring
Between connected in star, described control hydraulic fluid port is between described the 9th annular groove and the tenth described annular groove.
A kind of reversing valve core the most according to claim 1, it is characterised in that described Handleset includes handle and pressure
Head, described handle is connected by bearing pin with the afterbody of described pressure head, and described second is stretched in the front portion of described pressure head
In cavity, when described spool is in zero-bit state, the handle described in rotation, described pressure head moves forward promotion institute
The valve rod stated is advanced into duty.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410657208.0A CN104454725B (en) | 2014-11-18 | 2014-11-18 | A kind of reversing valve core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410657208.0A CN104454725B (en) | 2014-11-18 | 2014-11-18 | A kind of reversing valve core |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104454725A CN104454725A (en) | 2015-03-25 |
| CN104454725B true CN104454725B (en) | 2017-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410657208.0A Active CN104454725B (en) | 2014-11-18 | 2014-11-18 | A kind of reversing valve core |
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| CN (1) | CN104454725B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111043093A (en) * | 2018-06-14 | 2020-04-21 | 吴玉芳 | Hydraulic control-manual double control proportional valve and working method of valve core thereof |
| CN110553081B (en) * | 2019-09-29 | 2024-07-05 | 上海羿弓氢能科技有限公司 | Hydraulic reversing valve and hydraulic reversing device |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1411505A (en) * | 1973-06-22 | 1975-10-29 | Clerk R C | Spool valves |
| US4240467A (en) * | 1979-01-15 | 1980-12-23 | Blatt L Douglas | Valve assembly |
| CN2054106U (en) * | 1989-05-05 | 1990-03-07 | 建设部长沙建筑机械研究所 | Multiple-way change valve with single valve stem |
| JP4415357B2 (en) * | 2006-02-08 | 2010-02-17 | 吉冨 昭三 | Cylinder operating direction switching device |
| CN201582240U (en) * | 2009-12-25 | 2010-09-15 | 江阴市奕蓓液压设备有限公司 | Manual reversing valve |
| CN202091555U (en) * | 2011-06-07 | 2011-12-28 | 中国电子科技集团公司第十八研究所 | Slide-valve-type two-position and three-way reversing valve |
| CN102996551A (en) * | 2012-11-19 | 2013-03-27 | 安徽金达利液压有限公司 | Two-position three-way pneumatically-controlled hydraulic reversing device |
| CN203656261U (en) * | 2013-12-24 | 2014-06-18 | 上海立新液压有限公司 | Plug-in mounting solenoid reversing valve |
| CN103727085A (en) * | 2014-01-20 | 2014-04-16 | 谭荣祥 | Hydraulic reversing valve structure |
| CN204344559U (en) * | 2014-11-18 | 2015-05-20 | 宁波长壁流体动力科技有限公司 | A kind of changeover valve core |
-
2014
- 2014-11-18 CN CN201410657208.0A patent/CN104454725B/en active Active
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| CN104454725A (en) | 2015-03-25 |
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