CN107664147B - 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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- CN107664147B CN107664147B CN201710755839.XA CN201710755839A CN107664147B CN 107664147 B CN107664147 B CN 107664147B CN 201710755839 A CN201710755839 A CN 201710755839A CN 107664147 B CN107664147 B CN 107664147B
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- positioning
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- main valve
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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
Abstract
The invention belongs to the technical fields 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, artificial visual determination drilling machine stop position time inaccuracy, system high pressure overflow, caused by hydraulic system low efficiency, the high problem of energy consumption, it is superimposed upon change valve control terminal, including valve body I, position spool 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 on valve body, right reset control mouth b and drain tap c；II left end of positioning spool is screw rod, is threadedly coupled composition fixation kit with hand-operated direction valve main valve plug；The arrangement achieves the functions that liquid external control makes position in spool reply, provide new control method for the semi-automation of executing agency or automation control, have liberated operator's both hands, make its parallel operations, improve worker's labor efficiency.
Description
Technical field
The invention belongs to the technical fields 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.
It is superimposed a kind of control device for reversing in change valve control terminal, has been located at left position or right position after making commutation
Main valve plug liquid external control automatically returns to middle position.
Background technique
Various tunnels (including coal mine down-hole tunnel), ground surface works work progress in, suspension roof support has become respectively
One of kind rock mass, main method for protecting support of Sloping, airborne hydraulic jumbolter are the main of anchor-rod supporting mechanismization construction
Equipment.When all-hydraulic jumbolter jewel hole, hydraulic multichannel conversion valve main valve plug goes back to middle position and mainly uses full manual control mode, returns
Position movement can not be detached from artificial in multiple, to cannot achieve semi- or fully automated control.All-hydraulic drill is in jewel hole process simultaneously
In, when drilling machine is crept into or is retreated to extreme position, position during reversal valve is multiple manually cuts off fuel feeding.During being somebody's turn to do, there are a people
For the drawback of visual determination drilling machine extreme position inaccuracy, oily high pressure kicks, system heat generation, hydraulic system efficiency drop are caused stress
Low problem.Detailed process are as follows: in jewel hole, multiple directional control valve feeding connection and drill motor rotation two main valve plugs of connection change drilling machine
To, drilling rod feeding and rotation, at the end of drilling machine is fed to drilling rod stroke, the end of operator's visual determination stroke, manually
It pushes away main valve plug and returns to middle position, cutting 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, and still in work oil level, feeding connection hydraulic oil still fuel feeding, feed pressure moment is increased to safety overflow pressure
Power makes to feed alliance oil high pressure kicks, and system heat generation increases.Position delay time is longer in main valve plug reply, and overflow time is longer,
System heat generation amount increase is more, and system effectiveness is lower, and energy consumption increases.If multiple directional control valve may be implemented to move to the limit when drilling machine
When position, main valve plug instantaneously returns middle position cutting supply pressure oil automatically, so as to avoid the fault of artificial visual determination, so that liquid
System heat generation amount is pressed to reduce, efficiency of drilling machine drilling improves, and energy consumption also decreases；Simultaneously as drilling machine can stop automatically when drilling
Only, operator is without paying close attention to drilling machine movement position, to liberate operator's both hands, makes its parallel operations, improves labour effect
Rate.
Currently, domestic multiple directional control valve does not have the function of main valve plug external control return to mid-position position control.
Summary of the invention
When the present invention is in order to solve all-hydraulic drill drilling or retreat, the artificial visual determination drilling machine stop position time is inaccurate
Really, system high pressure overflow, caused by the high problem of hydraulic system low efficiency, energy consumption, provide a kind of hand-operated direction valve main valve plug
The multiple middle level control device of liquid external control, at commutation to left position and right position, instantaneously multiple middle position control fills liquid external control reversal valve main valve plug
It sets, at the end of so that drilling machine is crept into stroke, drilling machine is automatically stopped, and Hydraulic System Fever is reduced, efficiency improves, energy consumption reduces.
The present invention adopts the following technical scheme that realization: control dress in position during a kind of hand-operated direction valve main valve plug liquid external control is multiple
It sets, it is characterised in that be superimposed upon change valve control terminal, including valve body I, positioning spool 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 on valve body left reset control mouth a, right reset control mouth b and
Drain tap c, valve body I and hand-operated direction valve main valve body are both provided with end face seal；II left end of positioning spool be screw rod, with
Hand-operated direction valve main valve plug, which is threadedly coupled, constitutes fixation kit, and positioning II right end of spool is interior hexagonal counterbore, as positioning spool
The II impact wrench hole connecting with hand-operated direction valve main valve plug, positioning II cylinder of spool is there are two circular arc deep gouge is positioned, as master
The locating groove of spool commutation left position and right position；The position reset mechanism III includes being set gradually from left to right in normal valve
Position cutting ferrule, left end cap, left steel bead groove sliding sleeve, left compression sliding sleeve, left positioning ball, centre in left position cutting ferrule, the right side on core II
Fixing sleeve, right positioning ball, right compression sliding sleeve, right steel bead groove sliding sleeve and right end cap；The intermediate fixing sleeve is placed on positioning
It being fixedly connected on spool II and by positioning pin with valve body I, intermediate fixing sleeve two sides are left positioning ball and right positioning ball,
The two sides of left positioning ball and right positioning ball are respectively that the left steel bead groove sliding sleeve being placed on positioning spool II and right steel bead groove are sliding
The left compression sliding sleeve and right compression sliding sleeve for covering and being placed on left steel bead groove sliding sleeve and right steel bead groove sliding sleeve, left compression sliding sleeve and the right side
Being designed with annular chamber on compression sliding sleeve outer cylinder can be connected to left control port a and right control port b respectively, the 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
There is the circular conical surface that can push down positioning ball in the inner cylinder of side, left compression sliding sleeve and the right left and right sides for compressing sliding sleeve are respectively
With left end cap spaced between it and right end cap, 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
There are step surface in snap ring, II left end of positioning spool, and position cutting ferrule in the right side is provided on the left of step surface, and in the right side left side for position cutting ferrule
Side is left position cutting ferrule, is provided with centering spring in left position cutting ferrule and the right side between the cutting ferrule of position, all non-controlling oil cavities all with
Drain tap c is connected.
The positioning ball is used to block the position of positioning valve rod, so that main valve plug is locked at 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；Intermediate fixing sleeve 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 slot move steel ball may only radially
It is dynamic, and relative axial position is constant；The position of the fixed left and right end cap of snap ring；The left annular groove for compressing sliding sleeve and left reset control
Mouth a is connected, and the right annular groove for compressing sliding sleeve is connected with right reset control mouth b, and there are two areas for two compression sliding sleeve outer circles designs
Different annular hydraulic fluid acting surfaces, under the action of outer oil-control, sliding sleeve is axially moved to the small direction of stress.
There is annular protrusion in the intermediate fixing sleeve cylinder middle section, and annular protrusion is fixedly connected by positioning pin with valve body I,
Valve body I is correspondingly arranged on annular convex platform and contacts positioning with the right end of intermediate fixing sleeve annular protrusion.
The position that the left compression sliding sleeve and right compression sliding sleeve outer cylinder are contacted with valve body I is provided with sealing ring, is used for
Seal the hydraulic oil of control port.
The 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 greater than the annular acting surface area of the other side.The left compression sliding sleeve and right compression sliding sleeve are close to intermediate
The internal diameter of fixing sleeve one end is greater than the outer diameter of intermediate fixing sleeve corresponding end end.
Level control device during a kind of hand-operated direction valve main valve plug liquid external control is multiple, is used for multiple directional control valve, is superimposed upon
The tail portion of the monolithic valve for the multiple directional control valve for needing to control, is fixedly connected with monolithic valve body, and the maximum of the valve body I is transversal
Face shape is less than the cross-sectional profile of multiple directional control valve monolithic valve.
Compared with prior art compared with, the present invention have it is following the utility model has the advantages that
1, the multi-way valve reversing arrangement, which realizes liquid external control, makes the function of position in spool reply, uses liquid external control return to mid-position
Bit function provides new control method for the semi-automation of executing agency or automation control；
2, the reversing arrangement is applied in drilling machine circuit, when drilling machine moves to extreme position, reversal valve feed pressure oil
By colliding valve, enter pressure oil from liquid outside control mouth, control bound core instantaneous Hui Zhongwei automatically, and then reversal valve fuel feeding is cut off,
Avoid the fault of artificial visual determination, caused by Hydraulic System Fever amount increase, drilling machine is drilled low efficiency, and energy consumption is raised to ask
Topic；
3, it can be automatically stopped when being drilled due to drilling machine, operator is without paying close attention to drilling machine movement position, to liberate operation
Personnel's both hands make its parallel operations, improve worker's labor efficiency.
Detailed description of the invention
Fig. 1 is control device for reversing structural schematic diagram of the present invention；
Fig. 2 is the multi-way valve outline drawing for installing reversing arrangement；
Fig. 3 is installation reversing arrangement simply connected structure chart；
Fig. 4 is Fig. 3 left view；
Fig. 5 is the positioning right position schematic diagram of spool.
Specific 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 spool II and position reset mechanism III,
The valve body I is fixedly connected with hand-operated direction valve main valve body, and left reset control mouth a, right reset are provided on valve body
Control mouth b and drain tap c；II left end of positioning spool is threadedly coupled composition for screw rod, with hand-operated direction valve main valve plug
Fixation kit, positioning II right end of spool are interior hexagonal counterbore, are twisted as what positioning spool II was connect with hand-operated direction valve main valve plug
Spanner hole, there are two positioning circular arc deep gouges for positioning II cylinder of spool, the locating groove as main valve plug commutation left position and right position；
The position reset mechanism III include be set gradually from left to right positioning spool II on left position cutting ferrule 3-1, the right side in 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, intermediate fixing sleeve 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；The intermediate fixing sleeve 14
It is placed on positioning spool II and is fixedly connected by positioning pin 13 with valve body I, intermediate 14 two sides of fixing sleeve are left positioning ball 12-
The two sides of 1 and right positioning ball 12-2, left positioning ball 12-1 and right positioning ball 12-2 are respectively to be placed on positioning spool II
On left steel bead groove sliding sleeve 15-1 and right steel bead groove sliding sleeve 15-2 and be placed on left steel bead groove sliding sleeve 15-1 and right steel bead groove sliding sleeve
On left compression sliding sleeve 10-1 and right compression sliding sleeve 10-2, left compression sliding sleeve 10-1 and right compression sliding sleeve 10-2 outer cylinder on 15-2
Being designed with annular chamber can be connected to left control port a and right control port b respectively, and the annular of the annular chamber left and right ends is made
With face area difference, 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
There is the circular conical surface that can push down positioning ball in the inner cylinder of side, it is left to compress sliding sleeve 10-1 and the right left and right two for compressing sliding sleeve 10-2
Side respectively with left end cap 7 spaced between it and right end cap 16, is provided with a left side between left compression sliding sleeve 10-1 and left end cap 7
Compression bead spring 9-1, is provided with right compression bead spring 9-2, left end cap 7 and right end cap 16 between right compression sliding sleeve 10-2 and right end cap 16
Left and right ends be respectively arranged with left snap ring 6-1 and right snap ring 6-2；There are step surface, step surface in II left end of positioning spool
Left side be provided with cutting ferrule 3-2 in position in the right side, the left side of position cutting ferrule 3-2 is left position cutting ferrule 3-1 in the right side, left position cutting ferrule 3-1 and
Centering spring 4 is provided in the right side between position cutting ferrule 3-2, all non-controlling oil cavities are all connected with drain tap c.
There is annular protrusion in the intermediate fixing sleeve cylinder middle section, and annular protrusion connects by the way that positioning pin 13 and valve body I are fixed
It connects, valve body I is correspondingly arranged on annular convex platform and contacts positioning with the right end of intermediate fixing sleeve annular protrusion.
The position that the left compression sliding sleeve 10-1 and right compression sliding sleeve 10-2 outer cylinder are contacted with valve body I is provided with sealing
Circle.
The left compression sliding sleeve 10-1 and the right annular chamber for compressing sliding sleeve 10-2 are fixed close to left positioning ball 12-1 and the right side
The annular acting surface area of the position side steel ball 12-2 is greater than the annular acting surface area of the other side.The left compression sliding sleeve and the right side
Compress the outer diameter that sliding sleeve is greater than intermediate fixing sleeve corresponding end end close to the internal diameter of intermediate fixing sleeve one end.
Level control device during a kind of hand-operated direction valve main valve plug liquid external control is multiple, is used for multiple directional control valve, is superimposed upon
The tail portion of the monolithic valve for the multiple directional control valve for needing to control, is fixedly connected with monolithic valve body, and the maximum of the valve body I is transversal
Face shape is less than the cross-sectional profile of multiple directional control valve monolithic valve.
In conjunction with attached drawing, specific embodiments of the present invention will be further explained.
As shown in Figure 1, be apparatus of the present invention being the main valve plug control device for reversing for being superimposed upon multi-way valve monolithic valve tail portion.By
Three parts composition, valve body I, positioning spool II, position reset mechanism III.Valve body I and multi-way valve monolithic valve are connected with four bolts 17
It connects, third sealing ring 2 is for the two end face oil sealing.Fig. 2 is that there are two tetrad multi-way valve of the invention, the main valve commutation controls for dress
For device 22 on multi-way valve the first 18 and the second 19, the third connection 20 and tetrad 21 of multi-way valve are fitted without the present invention
Device.The present invention be needing manual reverse of direction positioning hydraulic control it is multiple in position commutation function when installation, when not needing the function not
It needs to install.
As shown in figure 3, positioning II left end of spool is screw rod, it is threadedly coupled with reversal valve main valve plug and constitutes fixation kit.It is fixed
Position II right end of spool is interior hexagonal counterbore, the impact wrench hole connecting as positioning spool II with main valve plug.Position II column of spool
Two positioning circular arc deep gouges are designed in face, the locating groove as main valve plug commutation left position and right position.
As shown in Figure 1 and Figure 3, position reset mechanism include left position cutting ferrule 3-1 with position cutting ferrule 3-2 in the right side, be 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, intermediate fixing sleeve 14, left steel bead groove sliding sleeve 15-1 and right steel bead groove sliding sleeve 15-2 and right end cap 16.It is compressing outside sliding sleeve
Cylinder design has 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 spool 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；The spring force of left compression bead spring 9-1 and right compression bead spring 9-2 is respectively acting on left compression sliding sleeve 10-1 and right pressure
On tight sliding sleeve 10-2, compresses sliding sleeve circular conical surface and push down positioning ball；Intermediate fixing sleeve 14 is fixed by positioning pin 13, with left steel bead groove
Sliding sleeve 15-1 is fixed with the right relative position steel bead groove sliding sleeve 15-2, is constituted positioning ball radial motion slot, is made steel ball may only diameter
To movement, and relative axial position is constant；Left snap ring 6-1 and right snap ring 6-2 fixes the position of left end cap 7, 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 and right reset control
Mouth b is connected, and two compress the sliding sleeve outer circles design annular hydraulic fluid acting surface different there are two area, 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 working principle of the invention, to be assemblied in multi-way valve wherein for a plate valve, as shown in the structural schematic diagram of Fig. 3,
It positions spool II and main valve plug 24 constitutes fixed spool, 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
Movement moves downward main valve plug together with positioning spool with reversing handle 23, and centering spring 4 has certain preload after compressing
Power, when the locating groove for positioning spool II moves to the position of right positioning ball 12-2, right positioning ball 12-2 is in right compression
Under the action of sliding sleeve 10-2 compresses inclined-plane, into locating groove, right compression sliding sleeve is moved downward, and compresses right positioning ball, from
And by the positioning of main valve plug 24 to left 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 pressure oil cavity of 10-2 or so annular acting surface is different, under the action of compression slides over pressure oil, slides axially to the right,
Right positioning ball 12-2 pressing force release, is no longer compacted, main valve plug 24 moves right under the action of centering spring 4, automatically
Return back to position in spool.Multi-way valve changes right position positioning manually, same in the principle of position in hydraulic control again.
Claims (6)
- Level control device during 1. a kind of hand-operated direction valve main valve plug liquid external control is multiple, it is characterised in that be superimposed upon change valve control End, including valve body I, positioning spool II and position reset mechanism III,The valve body I is fixedly connected with hand-operated direction valve main valve body, and left reset control mouth a, right reset control are provided on valve body Mouth b and drain tap c；II left end of positioning spool is screw rod, is threadedly coupled composition fixation kit, normal valve with hand-operated direction valve main valve plug II right end of core is interior hexagonal counterbore, as the impact wrench hole that positioning spool II is connect with hand-operated direction valve main valve plug, normal valve There are two positioning circular arc deep gouges for II cylinder of core, the locating groove as main valve plug commutation left position and right position；The position reset mechanism III include be set gradually from left to right positioning spool II on left position cutting ferrule (3-1), 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- in the right side 1), intermediate fixing sleeve (14), right positioning ball (12-2), right compression sliding sleeve (10-2), right steel bead groove sliding sleeve (15-2) and the right side End cap (16),The intermediate fixing sleeve (14) is placed on positioning spool II and is fixedly connected by positioning pin (13) with valve body I, intermediate Fixing sleeve (14) two sides are left positioning ball (12-1) and right positioning ball (12-2), left positioning ball (12-1) and right positioning The two sides of steel ball (12-2) are respectively the left steel bead groove sliding sleeve (15-1) being placed on positioning spool II and right steel bead groove sliding sleeve (15- And the left compression sliding sleeve (10-1) being placed on left steel bead groove sliding sleeve (15-1) and right steel bead groove sliding sleeve (15-2) and right compression 2) Be designed on sliding sleeve (10-2), left compression sliding sleeve (10-1) and right compression sliding sleeve (10-2) outer cylinder annular chamber can respectively with left control Liquefaction mouth a is connected to right control port b, and the annular acting surface area of the annular chamber left and right ends is different, left compression sliding sleeve (10-1) and right compress sliding sleeve (10-2) are in the inner cylinder of the side left positioning ball (12-1) and right positioning ball (12-2) Have a circular conical surface that can push down positioning ball, it is left compress sliding sleeve (10-1) and the right left and right sides for compressing sliding sleeve (10-2) respectively with Spaced left end cap (7) and right end cap (16) between it, are provided with left pressure between left compression sliding sleeve (10-1) and left end cap (7) Pearl spring (9-1), is provided with right compression bead spring (9-2) between right compression sliding sleeve (10-2) and right end cap (16), left end cap (7) and The left and right ends of right end cap (16) are respectively arranged with left snap ring (6-1) and right snap ring (6-2),There is step surface in II left end of positioning spool, and position cutting ferrule (3-2) in the right side, position cutting ferrule in the right side are provided on the left of step surface The left side of (3-2) is left position cutting ferrule (3-1), is provided between position cutting ferrule (3-2) in left position cutting ferrule (3-1) and the right side and is 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 the intermediate fixing sleeve cylinder middle section, and annular protrusion is fixedly connected by positioning pin (13) with valve body I, valve body I, which is correspondingly arranged on annular convex platform, contacts positioning with the right end of intermediate fixing sleeve annular protrusion.
- 3. level control device during a kind of hand-operated direction valve main valve plug liquid external control according to claim 1 or 2 is multiple, feature exist The position that the left compression sliding sleeve (10-1) and right compression sliding sleeve (10-2) outer cylinder contact with valve body I is provided with sealing 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 The left compression sliding sleeve (10-1) and the right annular chamber for compressing sliding sleeve (10-2) are close to left positioning ball (12-1) and right positioning The annular acting surface area of the side steel ball (12-2) is greater than the annular acting surface area of the other 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 The left compression sliding sleeve (10-1) and the right internal diameter for compressing sliding sleeve (10-2) close to intermediate fixing sleeve (14) one end are greater than centre The outer diameter of fixing sleeve (14) 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, it is superimposed upon the tail portion for needing the monolithic valve of the multiple directional control valve controlled, is fixedly connected with monolithic valve body, The maximum cross section shape of the valve body I is less than the cross-sectional profile of multiple directional control valve 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 true CN107664147B (en) | 2019-02-19 |
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| 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 |
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| CN87202244U (en) * | 1987-02-16 | 1988-03-02 | 长沙工程机械液压件厂 | Hydraulic memory valve of hydraulic lifting jack |
| CN2038171U (en) * | 1988-11-30 | 1989-05-24 | 山东省临清汽车配件厂 | Gas controlling lifting valve |
| CN101737370B (en) * | 2010-01-29 | 2011-11-09 | 浙江大学 | Fast hydraulic change-over valve |
| CN203500562U (en) * | 2013-08-13 | 2014-03-26 | 河北日升液压技术有限公司 | Load feedback self-resetting reversing valve |
| CN106762906B (en) * | 2016-12-27 | 2018-03-30 | 恒天九五重工有限公司 | A kind of hydraulic crawler excavator main pump power aux. control valve |
| CN106930994B (en) * | 2017-05-09 | 2018-03-09 | 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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