CN107664147A - Level control device during hand-operated direction valve main valve plug liquid external control is multiple - Google Patents
Level control device during hand-operated direction valve main valve plug liquid external control is multiple Download PDFInfo
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- CN107664147A CN107664147A CN201710755839.XA CN201710755839A CN107664147A CN 107664147 A CN107664147 A CN 107664147A CN 201710755839 A CN201710755839 A CN 201710755839A CN 107664147 A CN107664147 A CN 107664147A
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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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- Multiple-Way Valves (AREA)
Abstract
The invention belongs to the technical field that change-over valve core resets control, level control device during specifically a kind of hand-operated direction valve main valve plug liquid external control is multiple, when solving all-hydraulic drill drilling or retreating, the artificial visual determination rig stop position time is inaccurate, system high pressure overflow, caused by hydraulic system efficiency it is low, the problem of high energy consumption, it is superimposed upon change valve control terminal, including valve body I, position valve element II and position reset mechanism III, the valve body I is fixedly connected with hand-operated direction valve main valve body, left reset control mouth a is provided with valve body, right reset control mouth b and drain tap c；Positioning valve element II left end is screw rod, composition fixation kit is threadedly coupled with hand-operated direction valve main valve plug；The arrangement achieves liquid external control to make valve element reply the function of middle position, provides new control method for the semi-automation of executing agency or Automated condtrol, has liberated operating personnel's both hands, made its parallel operations, improved worker's efficiency.
Description
Technical field
The invention belongs to the technical field that change-over valve core resets control, outside specifically a kind of hand-operated direction valve main valve plug liquid
Level control device during control is multiple.
A kind of control device for reversing is superimposed in change valve control terminal, makes to have been located at after commutation left position or right position
Main valve plug liquid external control automatically returns to middle position.
Background technology
In various tunnels（Including coal mine down-hole tunnel）, ground surface works work progress in, suspension roof support has become respectively
One of main method for protecting support of rock mass, Sloping is planted, airborne hydraulic jumbolter is the main of anchor-rod supporting mechanismization construction
Equipment.During all-hydraulic jumbolter jewel hole, hydraulic multichannel conversion valve main valve plug returns middle position and mainly uses full manual control mode, returns
Multiple middle position action can not depart from manually, so as to realize semi- or fully automated control.All-hydraulic drill is in jewel hole process simultaneously
In, when rig is crept into or is retreated to extreme position, reversal valve answers middle position manually, cuts off fuel feeding.During being somebody's turn to do, a people be present
For visual determination rig extreme position inaccuracy the drawbacks of, build-up of pressure oil high pressure kicks, system heat generation, hydraulic system efficiency drop
The problem of low.Detailed process is：In jewel hole, multiple directional control valve feeding connection and drill motor rotation two main valve plugs of connection change rig
To, drilling rod feeding and rotation, at the end of rig is fed to drilling rod stroke, the end of operating personnel's visual determination stroke, manually
Push away main valve plug and return to middle position, cut-out feeding connection hydraulic oil.When artificial vision judges extreme position delay, reversal valve main valve plug main valve
Core is not returned to middle position, is still increased to safety overflow pressure in work oil level, feeding connection hydraulic oil still fuel feeding, feed pressure moment
Power, make feeding alliance oil high pressure kicks, system heat generation increase.Main valve plug reply middle position time delay is longer, and overflow time is longer,
System heat generation amount increase is more, and system effectiveness is lower, energy consumption increase.If multiple directional control valve can be realized when rig moves to the limit
During position, main valve plug instantaneously returns middle position cut-out supply pressure oil automatically, so as to avoid the error of artificial visual determination so that liquid
System heat generation amount is pressed to reduce, efficiency of rig drilling improves, and energy consumption also decreases；Simultaneously as rig can stop automatically when drilling
Only, operating personnel need not pay close attention to rig movement position, so as to liberate operating personnel's both hands, make its parallel operations, improve work effect
Rate.
At present, domestic multiple directional control valve does not possess the function of main valve plug external control return to mid-position position control.
The content of the invention
When the present invention is in order to solve all-hydraulic drill drilling or retreat, the artificial visual determination rig stop position time is forbidden
Really, system high pressure overflow, caused by the problem of hydraulic system efficiency is low, high energy consumption, there is provided a kind of hand-operated direction valve main valve plug
Level control device during liquid external control is multiple, for reversal valve main valve plug when commutation is to left position and right position, liquid external control instantaneously answers middle position control dress
Put, at the end of making rig drilling stroke, rig is automatically stopped, and Hydraulic System Fever is reduced, efficiency improves, energy consumption reduces.
The present invention adopts the following technical scheme that realization：A kind of multiple middle position control dress of hand-operated direction valve main valve plug liquid external control
Put, it is characterised in that be superimposed upon change valve control terminal, including valve body I, positioning valve element II and position reset mechanism III；Institute
The valve body I stated is fixedly connected with hand-operated direction valve main valve body, be provided with valve body left reset control mouth a, right reset control mouth b and
Drain tap c, valve body I are both provided with end face seal with hand-operated direction valve main valve body；The described left end of positioning valve element II be screw rod, with
The threaded connection of hand-operated direction valve main valve plug forms fixation kit, and the positioning right-hand member of valve element II is interior hexagonal counterbore, as positioning valve element
The II impact wrench hole being connected with hand-operated direction valve main valve plug, the positioning cylinder of valve element II has two positioning circular arc deep gouges, as master
The valve element left position of commutation and the locating groove of right position；Described position reset mechanism III includes from left to right being successively set on normal valve
Left position cutting ferrule, right middle position cutting ferrule, left end cap, left steel bead groove sliding sleeve, left compression sliding sleeve on core II, left positioning ball, centre
Fixed cover, right positioning ball, right compression sliding sleeve, right steel bead groove sliding sleeve and right end cap；Described middle fixed cover is placed on positioning
It is fixedly connected on valve element II and by alignment pin with valve body I, middle fixed cover both sides are left positioning ball and right positioning ball,
The both sides of left positioning ball and right positioning ball are respectively the left steel bead groove sliding sleeve and right steel bead groove cunning being placed on positioning valve element II
Cover and the left compression sliding sleeve being placed on left steel bead groove sliding sleeve and right steel bead groove sliding sleeve and right compression sliding sleeve, left compression sliding sleeve and the right side
Being designed with annular chamber on compression sliding sleeve outer cylinder can connect with left control port a and right control port b respectively, described annular chamber
The annular acting surface area of left and right ends is different, and left compression sliding sleeve and right compression sliding sleeve are close to left positioning ball and right positioning ball
The circular conical surface of positioning ball can be pushed down by having in the inner cylinder of side, and the left and right sides of left compression sliding sleeve and right compression sliding sleeve is respectively
With spaced left end cap and right end cap between it, left compression bead spring, right compression are provided between left compression sliding sleeve and left end cap
It is provided with left compression bead spring between sliding sleeve and right end cap, the left and right ends of left end cap and right end cap are respectively arranged with left snap ring and the right side
Snap ring, the described left end of positioning valve element II have step surface, and right middle position cutting ferrule, a left side for right middle position cutting ferrule are provided with the left of step surface
Side is left position cutting ferrule, is provided with centering spring between left position cutting ferrule and right middle position cutting ferrule, all non-controlling oil cavities all with
Drain tap c is connected.
Described positioning ball is used for the position for blocking positioning valve rod, so as to which main valve plug is locked at into left position or right position；Pressure
For the spring-force driven dual of pearl spring on surely tight sliding sleeve, compression sliding sleeve circular conical surface pushes down positioning ball；Middle fixed cover is determined by screw thread
Position pin is fixed, and is fixed with steel bead groove sliding sleeve relative position, stroke positioning ball radial motion groove, steel ball is radially moved
It is dynamic, and relative axial position is constant；Snap ring fixes the position of left and right end cap；The left annular groove for compressing sliding sleeve controls with left reset
Mouthful a is connected, and the right annular groove for compressing sliding sleeve is connected with right reset control mouth b, and sliding sleeve is cylindrical is designed with two areas for two compressions
Different annular hydraulic fluid acting surfaces, in the presence of outer oil-control, sliding sleeve is axially moved to the small direction of stress.
There is annular protrusion in described middle fixed cover cylinder stage casing, and annular protrusion is fixedly connected by alignment pin with valve body I,
Valve body I is correspondingly arranged on annular boss and the right-hand member contact of middle fixed cover annular protrusion positions.
Described left compression sliding sleeve and right compression sliding sleeve outer cylinder are provided with sealing ring with the position that valve body I contacts, and are used for
Seal the hydraulic oil of control port.
Described left compression sliding sleeve and the right annular chamber for compressing sliding sleeve are close to left positioning ball and right positioning ball side
Annular acting surface area is more than the annular acting surface area of opposite side.Described left compression sliding sleeve and right compression sliding sleeve are close to middle
The internal diameter of fixed cover one end is more than the external diameter of middle fixed cover corresponding end end.
Level control device during a kind of described hand-operated direction valve main valve plug liquid external control is multiple, for multiple directional control valve, is superimposed upon
Need the afterbody of the monolithic valve of the multiple directional control valve controlled, be fixedly connected with monolithic valve body, described valve body I it is maximum transversal
Facial contour is less than the cross-sectional profile of banked direction control valves monolithic valve.
Compared with prior art compared with the present invention has following beneficial effect：
1st, the banked direction control valves reversing arrangement, which realizes liquid external control, makes valve element reply the function of middle position, uses liquid external control return to mid-position position work(
Can, provide new control method for the semi-automation of executing agency or Automated condtrol；
2nd, the reversing arrangement is applied in rig loop, and when rig moves to extreme position, reversal valve feed pressure oil passes through
Valve is collided, enters pressure oil from liquid outside control mouth, control bound core instantaneously returns middle position automatically, and then cuts off reversal valve fuel feeding, avoids
Artificial visual determination error, caused by Hydraulic System Fever amount increase, rig is drilled the problem of efficiency is low, and energy consumption raises；
It can be automatically stopped when the 3rd, being drilled due to rig, operating personnel need not pay close attention to rig movement position, so as to liberate operating personnel
Both hands, make its parallel operations, improve worker's efficiency.
Brief description of the drawings
Fig. 1 is control device for reversing structural representation of the present invention；
Fig. 2 is the banked direction control valves outline drawing of installation reversing arrangement；
Fig. 3 is installation reversing arrangement simply connected structure chart；
Fig. 4 is Fig. 3 left views；
Fig. 5 is the positioning right position schematic diagram of valve element.
Embodiment
Level control device during a kind of hand-operated direction valve main valve plug liquid external control is multiple, is superimposed upon change valve control terminal, including
Valve body I, positioning valve element II and position reset mechanism III,
Described valve body I is fixedly connected with hand-operated direction valve main valve body, left reset control mouth a is provided with valve body, right reset controls
Mouth b and drain tap c；The described left end of positioning valve element II is screw rod, composition fixation is threadedly coupled with hand-operated direction valve main valve plug
Component, the positioning right-hand member of valve element II be interior hexagonal counterbore, is pulled as the tightening of being connected with hand-operated direction valve main valve plug of valve element II is positioned
Hand hole, the positioning cylinder of valve element II have two positioning circular arc deep gouges, the locating groove of commutated as main valve plug left position and right position；It is described
Position reset mechanism III include from left to right be successively set on positioning valve element II on left position cutting ferrule 3-1, right middle position cutting ferrule
3-2, left end cap 7, left steel bead groove sliding sleeve 15-1, left compression sliding sleeve 10-1, left positioning ball 12-1, middle fixed cover 14, the right side are fixed
Position steel ball 12-2, right compression sliding sleeve 10-2, right steel bead groove sliding sleeve 15-2 and right end cap 16；Described middle fixed cover 14 is placed on
Be fixedly connected on positioning valve element II and with valve body I by alignment pin 13, the middle both sides of fixed cover 14 for left positioning ball 12-1 with
And right positioning ball 12-2, left positioning ball 12-1 and right positioning ball 12-2 both sides are respectively to be placed on positioning valve element II
Left steel bead groove sliding sleeve 15-1 and right steel bead groove sliding sleeve 15-2 and it is placed on left steel bead groove sliding sleeve 15-1 and right steel bead groove sliding sleeve 15-2
On left compression sliding sleeve 10-1 and it is right compress sliding sleeve 10-2, left compressions sliding sleeve 10-1 and it is right compress sliding sleeve 10-2 outer cylinders on all set
There is annular chamber to be connected respectively with left control port a and right control port b, the annular acting surface of described annular chamber left and right ends
Area is different, and left compression sliding sleeve 10-1 and right compression sliding sleeve 10-2 are close to left positioning ball 12-1 and right positioning ball 12-2 sides
Inner cylinder on have a circular conical surface that can push down positioning ball, left compression sliding sleeve 10-1 and the right left and right sides for compressing sliding sleeve 10-2 point
Left compression bead Wei not be provided between left compression sliding sleeve 10-1 and left end cap 7 with spaced left end cap 7 and right end cap 16 between it
Spring 9-1, right compression bead spring 9-2, left end cap 7 and right end cap 16 left side are provided between right compression sliding sleeve 10-2 and right end cap 16
Right both ends are respectively arranged with left snap ring 6-1 and right snap ring 6-2；The described left end of positioning valve element II has step surface, a left side for step surface
Side is provided with right middle position cutting ferrule 3-2, and right middle position cutting ferrule 3-2 left side is left position cutting ferrule 3-1, left position cutting ferrule 3-1 and it is right in
Centering spring 4 is provided between the cutting ferrule 3-2 of position, all non-controlling oil cavities are all connected with drain tap c.
There is annular protrusion in described middle fixed cover cylinder stage casing, and annular protrusion is fixed by alignment pin 13 and valve body I to be connected
Connect, valve body I is correspondingly arranged on annular boss and the right-hand member contact of middle fixed cover annular protrusion positions.
Described left compression sliding sleeve 10-1 and right compression sliding sleeve 10-2 outer cylinders are provided with sealing with the position that valve body I contacts
Circle.
Described left compression sliding sleeve 10-1 and the right annular chamber for compressing sliding sleeve 10-2 are determined close to left positioning ball 12-1 and the right side
The annular acting surface area of position steel ball 12-2 sides is more than the annular acting surface area of opposite side.Described left compression sliding sleeve and the right side
Compress the external diameter that internal diameter of the sliding sleeve close to middle fixed cover one end is more than middle fixed cover corresponding end end.
Level control device during a kind of described hand-operated direction valve main valve plug liquid external control is multiple, for multiple directional control valve, is superimposed upon
Need the afterbody of the monolithic valve of the multiple directional control valve controlled, be fixedly connected with monolithic valve body, described valve body I it is maximum transversal
Facial contour is less than the cross-sectional profile of banked direction control valves monolithic valve.
With reference to accompanying drawing, the embodiment of the present invention is described further.
As shown in figure 1, it is to be superimposed upon the main valve plug control device for reversing of banked direction control valves monolithic valve afterbody for apparatus of the present invention.By
Three parts form, valve body I, positioning valve element II, position reset mechanism III.Valve body I is connected with banked direction control valves monolithic valve with four bolts 17
Connect, the 3rd sealing ring 2 is used for both end face oil sealings.Fig. 2 is equipped with two tetrad banked direction control valves of the invention, the main valve commutation control
Device 22 on banked direction control valves the first 18 and the second 19, the 3rd 20 of banked direction control valves the and tetrad 21 be fitted without the present invention
Device.The present invention simply installs when needing the commutation function of the multiple middle position of manual reverse of direction positioning hydraulic control, it is not necessary to during the function not
Need to install.
As shown in figure 3, the positioning left end of valve element II is screw rod, it is threadedly coupled with reversal valve main valve plug and forms fixation kit.It is fixed
The position right-hand member of valve element II is interior hexagonal counterbore, the impact wrench hole being connected as positioning valve element II with main valve plug.Position the post of valve element II
Design two positioning circular arc deep gouges, the locating groove of commutated as main valve plug left position and right position in face.
As shown in Figure 1 and Figure 3, position reset mechanism includes left position cutting ferrule 3-1 and right middle position cutting ferrule 3-2, is hit by a bullet surely
Spring 4, left snap ring 6-1 and right snap ring 6-2, left end cap 7, the first sealing ring 8, left compression bead spring 9-1 and right compression bead spring 9-2, a left side
Compress sliding sleeve 10-1 and right compression sliding sleeve 10-2, the second sealing ring 11, left positioning ball 12-1 and right positioning ball 12-2, positioning
Pin 13, middle fixed cover 14, left steel bead groove sliding sleeve 15-1 and right steel bead groove sliding sleeve 15-2 and right end cap 16.Compressing outside sliding sleeve
Cylinder is designed with sealing ring, for sealing the hydraulic oil of control port；Left positioning ball 12-1 is used for right positioning ball 12-2
The position of positioning valve element II is blocked, main valve plug is locked at left position by left positioning ball 12-1, and right positioning ball 12-2 is by main valve plug
It is locked at right position；Left compression bead spring 9-1 and right compression bead spring 9-2 spring force is respectively acting on left compression sliding sleeve 10-1 and right pressure
On tight sliding sleeve 10-2, compress sliding sleeve circular conical surface and push down positioning ball；Middle fixed cover 14 is positioned pin 13 and fixed, with left steel bead groove
Sliding sleeve 15-1 fixes with right steel bead groove sliding sleeve 15-2 relative positions, forms positioning ball radial motion groove, makes steel ball may only footpath
To movement, and relative axial position is constant；Left snap ring 6-1 and right snap ring 6-2 fixes left end cap 7, the position of right end cap 16 respectively；
The left annular chamber for compressing sliding sleeve 10-1 is connected with left reset control mouth a, and the right annular chamber for compressing sliding sleeve 10-2 controls with right reset
Mouthful b is connected, and two compress that sliding sleeve is cylindrical to be designed with the different annular hydraulic fluid acting surface of two areas, in the effect of outer oil-control
Under, sliding sleeve is axially moved to the small direction of stress；All non-controlling oil cavities all connect with drain tap T-phase.
The operation principle of the present invention, exemplified by being assemblied in a banked direction control valves wherein plate valve, as shown in Fig. 3 structural representation,
Position valve element II and form fixed spool with main valve plug 24, reset cutting ferrule 3-1 in centering spring 4, left position and right position resets cutting ferrule 3-2
Positioning action under, main valve plug 24 is located at middle position, and main valve plug moves to the left or to the right, all needs to overcome centering spring power；Artificial hand
Action makes main valve plug be moved right together with positioning valve element with reversing handle 23, and centering spring 4 has certain pretension after compressing
Power, when the locating groove for positioning valve element II moves to right positioning ball 12-2 position, right positioning ball 12-2 is in right compression
In the presence of sliding sleeve 10-2 compresses inclined-plane, into locating groove, right compression sliding sleeve compresses right positioning ball to left movement, from
And position main valve plug 24 to right position, as shown in Figure 5.When pressure oil acts on right reset control mouth b, due to right compression sliding sleeve
The area of the annular acting surface of 10-2 pressure oil cavity or so is different, in the presence of compression slides over pressure oil, slides axially to the right,
The release of right positioning ball 12-2 thrusts, is no longer compacted, and main valve plug 24 is in the presence of centering spring 4, to left movement, automatically
Return back to valve element middle position.Banked direction control valves changes left position positioning manually, and hydraulic control is same in middle position principle again.
Claims (6)
- Level control device during 1. a kind of positioning reversal valve main valve plug liquid external control of band manually is multiple, it is characterised in that be superimposed upon reversal valve valve Body control terminal, including valve body I, positioning valve element II and position reset mechanism III,Described valve body I is fixedly connected with hand-operated direction valve main valve body, left reset control mouth a is provided with valve body, right reset controls Mouth b and drain tap c；The described left end of positioning valve element II is screw rod, composition fixation kit, normal valve is threadedly coupled with hand-operated direction valve main valve plug The right-hand member of core II is interior hexagonal counterbore, the impact wrench hole being connected as positioning valve element II with hand-operated direction valve main valve plug, normal valve The cylinder of core II has two positioning circular arc deep gouges, the locating groove of commutated as main valve plug left position and right position；Described position reset mechanism III includes the multiple middle position cutting ferrule in left position being from left to right successively set on positioning valve element II（3- 1）, the multiple middle position cutting ferrule in right position（3-2）, left end cap（7）, left steel bead groove sliding sleeve（15-1）, left compression sliding sleeve（10-1）, left positioning steel Pearl（12-1）, middle fixed cover（14）, right positioning ball（12-2）, right compression sliding sleeve（10-2）, right steel bead groove sliding sleeve（15-2） And right end cap（16）,Described middle fixed cover（14）It is placed on positioning valve element II and passes through alignment pin（13）It is fixedly connected with valve body I, it is middle Fixed cover（14）Both sides are left positioning ball（12-1）And right positioning ball（12-2）, left positioning ball（12-1）With right positioning Steel ball（12-2）Both sides be respectively be placed on positioning valve element II on left steel bead groove sliding sleeve（15-1）With right steel bead groove sliding sleeve（15- 2）And it is placed on left steel bead groove sliding sleeve（15-1）With right steel bead groove sliding sleeve（15-2）On left compression sliding sleeve（10-1）With right compression Sliding sleeve（10-2）, left compression sliding sleeve（10-1）With right compression sliding sleeve（10-2）Be designed with outer cylinder annular chamber can respectively with left control Liquefaction mouth a connects with right control port b, and the annular acting surface area of described annular chamber left and right ends is different, left compression sliding sleeve （10-1）With right compression sliding sleeve（10-2）Close to left positioning ball（12-1）With right positioning ball（12-2）In the inner cylinder of side The circular conical surface of positioning ball can be pushed down by having, left compression sliding sleeve（10-1）With right compression sliding sleeve（10-2）The left and right sides be respectively with Spaced left end cap between it（7）And right end cap（16）, left compression sliding sleeve（10-1）And left end cap（7）Between be provided with left pressure Pearl spring（9-1）, right compression sliding sleeve（10-2）And right end cap（16）Between be provided with right compression bead spring（9-2）, left end cap（7）With Right end cap（16）Left and right ends be respectively arranged with left snap ring（6-1）With right snap ring（6-2）,The described left end of positioning valve element II has step surface, and right middle position cutting ferrule is provided with the left of step surface（3-2）, right middle position cutting ferrule （3-2）Left side be left position cutting ferrule（3-1）, left position cutting ferrule（3-1）With right middle position cutting ferrule（3-2）Between be provided with and be hit by a bullet surely Spring（4）, all non-controlling oil cavities are all connected with drain tap c.
- Level control device during 2. a kind of hand-operated direction valve main valve plug liquid external control according to claim 1 is multiple, it is characterised in that There is annular protrusion in described middle fixed cover cylinder stage casing, and annular protrusion passes through alignment pin（13）It is fixedly connected with valve body I, valve body I is correspondingly arranged on the right-hand member contact positioning of annular boss and middle fixed cover annular protrusion.
- Level control device during 3. a kind of hand-operated direction valve main valve plug liquid external control according to claim 1 or 2 is multiple, its feature exist In described left compression sliding sleeve（10-1）With right compression sliding sleeve（10-2）Outer cylinder is provided with sealing with the position that valve body I contacts Circle.
- Level control device during 4. a kind of hand-operated direction valve main valve plug liquid external control according to claim 3 is multiple, it is characterised in that Described left compression sliding sleeve（10-1）With right compression sliding sleeve（10-2）Annular chamber close to left positioning ball（12-1）With right positioning Steel ball（12-2）The annular acting surface area of side is more than the annular acting surface area of opposite side.
- Level control device during 5. a kind of hand-operated direction valve main valve plug liquid external control according to claim 4 is multiple, it is characterised in that Described left compression sliding sleeve（10-1）With right compression sliding sleeve（10-2）Close to middle fixed cover（14）The internal diameter of one end is more than centre Fixed cover（14）The external diameter of corresponding end end.
- Level control device during 6. a kind of hand-operated direction valve main valve plug liquid external control according to claim 4 is multiple, it is characterised in that For multiple directional control valve, the afterbody of the monolithic valve for the multiple directional control valve for needing to control is superimposed upon, is fixedly connected with monolithic valve body, The maximum cross section profile of described valve body I is less than the cross-sectional profile of banked direction control valves monolithic valve.
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| CN201710755839.XA CN107664147B (en) | 2017-08-29 | 2017-08-29 | Level control device during hand-operated direction valve main valve plug liquid external control is multiple |
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| CN201710755839.XA CN107664147B (en) | 2017-08-29 | 2017-08-29 | Level control device during hand-operated direction valve main valve plug liquid external control is multiple |
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| CN107664147B CN107664147B (en) | 2019-02-19 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108374811A (en) * | 2018-05-02 | 2018-08-07 | 宁波真格液压科技有限公司 | A kind of oil path distribution valve with unloading function |
| CN110242753A (en) * | 2019-04-29 | 2019-09-17 | 杭州电子科技大学 | A kind of steam turbine emergency hand-operated valve |
| CN110319247A (en) * | 2019-04-29 | 2019-10-11 | 杭州电子科技大学 | A kind of two-dimensions primary and secondary compensation spray rotation jet chimney fast-switching arrangement |
| CN114215809A (en) * | 2021-12-20 | 2022-03-22 | 邳州宏盛液压元件有限公司 | Manual hydraulic valve |
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| CN106762906A (en) * | 2016-12-27 | 2017-05-31 | 恒天九五重工有限公司 | A kind of hydraulic crawler excavator main pump power aux. control valve |
| CN106930994A (en) * | 2017-05-09 | 2017-07-07 | 江苏力源液压机械有限公司 | Position floating reversal valve is jumped in the manual pressurize of tractor |
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| CN108374811A (en) * | 2018-05-02 | 2018-08-07 | 宁波真格液压科技有限公司 | A kind of oil path distribution valve with unloading function |
| CN108374811B (en) * | 2018-05-02 | 2019-12-24 | 江苏南京白马现代农业高新技术产业园有限公司 | Oil way distribution valve with unloading function |
| CN110242753A (en) * | 2019-04-29 | 2019-09-17 | 杭州电子科技大学 | A kind of steam turbine emergency hand-operated valve |
| CN110319247A (en) * | 2019-04-29 | 2019-10-11 | 杭州电子科技大学 | A kind of two-dimensions primary and secondary compensation spray rotation jet chimney fast-switching arrangement |
| CN114215809A (en) * | 2021-12-20 | 2022-03-22 | 邳州宏盛液压元件有限公司 | Manual hydraulic valve |
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