CN104315230B - A kind of pressure pressure guiding type water electromagnetic switch valve filtering with guide - Google Patents
A kind of pressure pressure guiding type water electromagnetic switch valve filtering with guide Download PDFInfo
- Publication number
- CN104315230B CN104315230B CN201410558693.6A CN201410558693A CN104315230B CN 104315230 B CN104315230 B CN 104315230B CN 201410558693 A CN201410558693 A CN 201410558693A CN 104315230 B CN104315230 B CN 104315230B
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- Prior art keywords
- guide
- valve
- spool
- main valve
- seal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 238000001914 filtration Methods 0.000 title claims abstract description 21
- 238000013016 damping Methods 0.000 claims abstract description 25
- 238000012856 packing Methods 0.000 claims abstract description 4
- 238000010276 construction Methods 0.000 claims description 2
- 238000005245 sintering Methods 0.000 claims description 2
- 230000003373 anti-fouling effect Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 2
- 238000007789 sealing Methods 0.000 description 5
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000012736 aqueous medium Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000004881 precipitation hardening Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0603—Multiple-way valves
- F16K31/0624—Lift valves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
- B01D35/04—Plug, tap, or cock filters filtering elements mounted in or on a faucet
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K47/00—Means in valves for absorbing fluid energy
- F16K47/02—Means in valves for absorbing fluid energy for preventing water-hammer or noise
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Magnetically Actuated Valves (AREA)
- Details Of Valves (AREA)
Abstract
The invention discloses a kind of pressure pressure guiding type water electromagnetic switch valve filtering with guide, comprise valve body, valve gap, electromagnet and guide's valve seat, main valve seal, main valve plug, pilot valve seal, guide's spool, Packing spring, pole filter core, off-load damping in cavity arrangements; Main valve plug and valve gap matched in clearance, main valve plug seal and main valve plug interference fit, and compress with guide's valve seat; Guide's spool is connected by straight pin with armature in electromagnet; Guide's spool seal and guide's spool matched in clearance, bottom back-up ring location; Guide's spool relies on back-up ring location, main valve plug upper end, in low pressure situation, can directly lift main valve plug; Guide's valve seat bottom and valve body form matched in clearance, form guide effect in the time that main valve plug moves; Guide's valve seat endoporus and off-load damping interference fit, form back pressure on guide oil road while opening. The present invention is compared with other electromagnetic switch valves, and volume is little, lightweight, and working pressure range is wide, and antifouling property is strong, and has reduced the vibration and noise of valve, has improved the job stability of valve.
Description
Technical field
The present invention relates to a kind of guide type electromagnetic switch valve, specifically a kind of pressure pressure guiding type water electromagnetic switch valve filtering with guide, belongs to Solenoid Valve Technology field.
Background technology
Switch valve also claims bi-bit bi-pass reversal valve, is direction control element conventional in hydraulic system, can be used as unloader or stop valve. Traditional switch valve adopts hydraulic oil as working media more, for the switch valve that is applied to aqueous medium, existing product mostly is low-pressure, low discharge valve member, existing many research both at home and abroad at present, but still there are many technical problems: 1. because the viscosity of water is low, poor lubricity, the leakage at the friction of spool and valve base chamber and valve port place is more serious; 2. the pressure for vaporization of water, far above hydraulic oil, easily produces cavitation, thereby reduces functional reliability and the life-span of valve; 3. complicated on pressure electromagnetic switch valve structure, difficulty of processing is large, and production cost is high, and contamination resistance is poor; 4. Pilotoperated reducing valve main valve is just openable in the time that upper and lower cavity reaches certain pressure reduction, and low voltage section branch exists certain dead band; 5. because the pulling force of electromagnet is limited, mesohigh electromagnetic switch valve port size is subject to strict restriction, and design difficulty is larger.
Fig. 1 is the pressure electromagnetic switch valve that Danfoss company of Denmark produces, and this valve primary valve part separates with pilot valve part, simple in structure, and electromagnet stroke is not subject to the impact of main valve plug lift; Damping hole is opened at main valve plug middle part simultaneously, can reduce body size. But opening of this valve main valve plug must rely on the pressure reduction of main valve plug upper and lower cavity to realize, and in the time that inlet water pressure is lower, main valve plug cannot be opened, magnetic valve lost efficacy; The risk that simultaneously single damping structure damping hole stops up, poppet port stops up and cause magnetic valve to lose efficacy is larger, and the reliability of this valve is reduced.
Summary of the invention
Technical problem to be solved by this invention is, overcome the shortcoming of prior art, a kind of pressure pressure guiding type water electromagnetic switch valve filtering with guide is provided, vibration, noise and the valve port that can effectively reduce valve leak, improve the job stability of valve, improve the reliability of valve.
In order to solve above technical problem, the invention provides a kind of pressure pressure guiding type water electromagnetic switch valve filtering with guide, comprise electromagnet, valve gap, valve body and be located at guide's spool and the main valve plug in described valve body and valve gap; Described electromagnet is arranged on the top of described valve gap, and described valve gap is provided with guide's spool installing hole of up/down perforation;
Described guide's spool is the axle construction that is provided with three steps, and the diameter of three steps increases gradually, bottom at described guide's spool maximum gauge step is provided with step groove, in described step groove, be provided with Packing spring and pilot valve seal, the step groove matched in clearance of guide's spool seal and guide's spool, in described pilot valve seal lower end is provided with, connect circlip and described step groove clamping, described pilot valve seal is fixed in described step groove; The minimum diameter step of described guide's spool is connected with described electromagnet by straight pin;
Described main valve plug is arranged in the main valve plug mounting groove of described valve gap bottom, and described main valve plug and valve gap matched in clearance are arranged between main valve plug and described valve gap and form and seal with O shape circle; Described main valve plug top is provided with guide's spool mounting groove, is provided with main valve seal groove in its bottom, between the guide's spool mounting groove on described main valve plug and main valve seal groove, is provided with through hole; Described guide's spool gap is assemblied in described guide's spool mounting groove, is provided with the first circlip on the top of its guide's spool, says that by described the first circlip described guide's spool is fixed on described main valve plug; The damping hole that is also provided with up/down perforation on described main valve body, in described damping hole, interference is equipped with filter core; Interference fit main valve seal in described main valve seal groove, described main valve seal center is provided with first through hole coaxial with described main valve plug through hole, in the through hole of described main valve plug, interference is equipped with guide's valve seat, described guide's valve seat is open column shape structure, its both ends are that an end opening is sealed in one end, openend stretches to described guide's spool mounting groove through the through hole of described main valve plug, blind end is arranged in described valve body, and is provided with the conduction hole communicating with internal cavities on cylinder in the described valve body of being placed in of described guide's valve seat;
Described valve body both sides have respectively water inlet and delivery port, described valve body top has valve gap mount pad, described valve gap is arranged on by screw on the valve gap mount pad of described valve body, the center of described valve gap mount pad is provided with the pod apertures communicating with water inlet, the outside of described pod apertures is provided with annular recess, described annular recess bottom is provided with the through hole being connected with delivery port, and the boss outside dimension at described annular recess middle part mates with the size of described main valve seal.
The technical scheme that the present invention further limits is: the aforesaid pressure pressure guiding type water electromagnetic switch valve filtering with guide, two damping holes are at least set on described main valve plug, and the symmetrical branch of described damping hole is on described main valve body, the filter core arranging in described damping hole adopts sintering pole filter core, damping hole forms symmetrical damping, greatly improve the force-bearing situation of single damping hole spool, reduce vibration and the noise of main valve plug, the antifouling property that strengthens switch valve has improved the reliability of switch valve simultaneously.
The aforesaid pressure pressure guiding type water electromagnetic switch valve filtering with guide, in the cavity of described guide's valve seat, interference is equipped with off-load damping, forms back pressure when formerly open on water guide road, improves the stability of valve core movement, has reduced vibration and noise.
The aforesaid pressure pressure guiding type water electromagnetic switch valve filtering with guide is provided with locating slot on the subpoint of described guide's valve seat bottom valve body, stablizes guide's valve seat, high flow capacity by time be difficult for fluctuating, reduce the fault rate of guide spool.
The aforesaid pressure pressure guiding type water electromagnetic switch valve filtering with guide, in order to ensure the overall sealing performance of switch valve, the junction of described valve gap and valve body and electromagnet is equipped with O-ring seals.
The aforesaid pressure pressure guiding type water electromagnetic switch valve filtering with guide is provided with back-moving spring in described electromagnet, in the time of off working state, makes the seal can be rapidly in sealing state.
The invention has the beneficial effects as follows: the pressure pressure guiding type water electromagnetic switch valve filtering with guide of the present invention, be applicable to the hydraulic pressure system with seawater, fresh water, the high working media such as water base, compared with other electromagnetic switch valves, volume is little, lightweight, and antifouling property is strong, is suitable for pressure wide, and reduce the vibration and noise of valve, improve the job stability of valve, improved the reliability of valve, be specially adapted to the occasion that system pressure is higher and flow is larger.
Brief description of the drawings
Fig. 1 is the pressure electromagnetic switch valve structure schematic diagram of prior art.
Fig. 2 is structural representation of the present invention.
In Fig. 2: 1 valve body, 2 guide's valve seats, 3 main valve seals, 4,16,17 sealing rings, 5 main valve plugs, 6,13 circlips, 7 pilot valve seals, 8 valve gaps, 9 guide's spools, 10 electromagnet, 11 straight pins, 12 Packing springs, 14 pole filter cores, 15 off-load dampings.
Detailed description of the invention
Embodiment 1
The present embodiment provides a kind of pressure pressure guiding type water electromagnetic switch valve filtering with guide, structure as shown in Figure 2, main valve plug 5 is placed in valve body 1 and valve gap 8 inside with guide's spool 9, valve gap 8 is connected by screw with valve body 1, and main valve plug seal 3 adopts interference fit also to compress with guide's valve seat 2 with main valve plug 5. Main valve plug 5 all has relative motion with guide's spool seal 7, guide's spool 9 with main valve plug 5 with valve gap 8, guide's spool 9, adopts matched in clearance. Soft-hard material pairing that the main valve plug of the present embodiment and valve seat, guide's spool and guide's valve seat adopt, engineering plastics or the aluminium bronze that hardness is lower inlayed at seal spool place, ensures spool intensity when guaranteeing sealing, and valve seat adopts precipitation-hardening stainless steel.
Main valve plug 5 has symmetrical duct and pole filter core interference fit, forms symmetrical damping, and the dynamic characteristic of main valve plug is tended towards stability more, reduces the vibration and noise of main valve plug 5; Pole filter core also can reduce the risk that poppet port stops up greatly, and meanwhile, the risk that symmetrical filter core stops up is simultaneously less than the risk that single damping is stopped up, and has greatly promoted the reliability of switch valve when lifting switch valve antifouling property. Reduce reasonable distribution intake antrum in magnetic valve size situation, first guide cavity volume as far as possible, greatly improve electromagnetic switch valve flow field, reduce vibration and noise.
Guide's valve seat 2 bottoms and valve body matched in clearance form guide effect in valve core movement process, reduce the polarization of spool; Guide's valve seat 2 endoporus and off-load damping 15 interference fit produce back pressure in the time that pilot valve is opened, and reduce vibration and the noise of spool, improve the stability of valve core movement; Between main valve plug 5 and valve gap 8, valve gap 8 and valve body 1, valve gap 8 and electromagnet 10, all use seal with O ring; Other interelements of the water inlet P of electromagnetic switch valve and delivery port and hydraulic system adopt tubular type to be connected.
When electromagnetic switch valve electromagnet is during in off-position, high-pressure fluid enters from water inlet P mouth, acts on main valve plug 5 lower surfaces, and low flow rate liquid flows into main valve plug epicoele by pole filter core simultaneously. Meanwhile, hydraulic coupling also acts on armature upper surface and guide's spool lower surface, and upper end lifting surface area is slightly larger than lower end lifting surface area, thereby guarantees the sealing of pilot valve part. When electromagnet obtains when electric, armature drives guide's spool upwards to lift, and pilot valve valve port is opened, and symmetrical damping hole, guide spool 9 valve ports, guide valve seat center relief hole, the off-load damping 15 of high-pressure fluid on main valve plug 5 flow to outlet. While flowing by symmetrical filter core due to liquid, will produce pressure drop at two ends, and make main valve plug 5 upper cavity pressures be less than lower cavity pressure, in the time that pressure reduction is enough large, hydraulic coupling promotes to move on main valve plug 5, and main valve valve port is opened, electromagnetic switch valve work.
In the time that operating pressure is lower, electromagnet is pull-up guide spool 9 and main valve plug 5 directly, directly opens main valve, electromagnetic valve work, and this mode of operation is forces guide.
Above embodiment only, for explanation technological thought of the present invention, can not limit protection scope of the present invention with this, every technological thought proposing according to the present invention, and any change of doing on technical scheme basis, within all falling into protection domain of the present invention.
Claims (8)
1. the pressure pressure guiding type water electromagnetic switch valve filtering with guide, comprises electromagnet, valve gap, valve body and is located at guide's spool and the main valve plug in described valve body and valve gap; It is characterized in that:
Described electromagnet is arranged on the top of described valve gap, and described valve gap is provided with guide's spool installing hole of up/down perforation;
Described guide's spool is the axle construction that is provided with three steps, and the diameter of three steps increases gradually, bottom at described guide's spool maximum gauge step is provided with step groove, in described step groove, be provided with Packing spring and pilot valve seal, the step groove matched in clearance of guide's spool seal and guide's spool, in described pilot valve seal lower end is provided with, connect circlip and described step groove clamping, described pilot valve seal is fixed in described step groove; The minimum diameter step of described guide's spool is connected with described electromagnet;
Described main valve plug is arranged in the main valve plug mounting groove of described valve gap bottom, and described main valve plug and valve gap matched in clearance are arranged between main valve plug and described valve gap and form and seal with O shape circle; Described main valve plug top is provided with guide's spool mounting groove, is provided with main valve seal groove in its bottom, between the guide's spool mounting groove on described main valve plug and main valve seal groove, is provided with through hole; Described guide's spool gap is assemblied in described guide's spool mounting groove, is provided with the first circlip on the top of its guide's spool, says that by described the first circlip described guide's spool is fixed on described main valve plug; The damping hole that is also provided with up/down perforation on described main valve body, in described damping hole, interference is equipped with filter core; Interference fit main valve seal in described main valve seal groove, described main valve seal center is provided with first through hole coaxial with described main valve plug through hole, in the through hole of described main valve plug, interference is equipped with guide's valve seat, described guide's valve seat is open column shape structure, its both ends are that an end opening is sealed in one end, openend stretches to described guide's spool mounting groove through the through hole of described main valve plug, blind end is arranged in described valve body, and is provided with the conduction hole communicating with internal cavities on cylinder in the described valve body of being placed in of described guide's valve seat;
Described valve body both sides have respectively water inlet and delivery port, described valve body top has valve gap mount pad, described valve gap is arranged on by screw on the valve gap mount pad of described valve body, the center of described valve gap mount pad is provided with the pod apertures communicating with water inlet, the outside of described pod apertures is provided with annular recess, described annular recess bottom is provided with the through hole being connected with delivery port, and the boss outside dimension at described annular recess middle part mates with the size of described main valve seal.
2. the pressure pressure guiding type water electromagnetic switch valve filtering with guide according to claim 1, is characterized in that: two damping holes are at least set on described main valve plug, and the symmetrical branch of described damping hole is on described main valve body.
3. the pressure pressure guiding type water electromagnetic switch valve filtering with guide according to claim 1, is characterized in that: in the cavity of described guide's valve seat, interference is equipped with off-load damping.
4. the pressure pressure guiding type water electromagnetic switch valve filtering with guide according to claim 1, is characterized in that: on the subpoint of described guide's valve seat bottom valve body, be provided with locating slot.
5. the pressure pressure guiding type water electromagnetic switch valve filtering with guide according to claim 1, is characterized in that: the junction of described valve gap and valve body and electromagnet is equipped with O-ring seals.
6. the pressure pressure guiding type water electromagnetic switch valve filtering with guide according to claim 1, is characterized in that: in described electromagnet, be provided with back-moving spring.
7. the pressure pressure guiding type water electromagnetic switch valve filtering with guide according to claim 1, is characterized in that: described guide's spool is fixedly linked by straight pin and described electromagnet.
8. the pressure pressure guiding type water electromagnetic switch valve filtering with guide according to claim 1, is characterized in that: described filter core is sintering pole filter core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410558693.6A CN104315230B (en) | 2014-10-20 | 2014-10-20 | A kind of pressure pressure guiding type water electromagnetic switch valve filtering with guide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410558693.6A CN104315230B (en) | 2014-10-20 | 2014-10-20 | A kind of pressure pressure guiding type water electromagnetic switch valve filtering with guide |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104315230A CN104315230A (en) | 2015-01-28 |
| CN104315230B true CN104315230B (en) | 2016-05-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410558693.6A Active CN104315230B (en) | 2014-10-20 | 2014-10-20 | A kind of pressure pressure guiding type water electromagnetic switch valve filtering with guide |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106594340B (en) * | 2015-10-20 | 2019-11-22 | 艾默生环境优化技术(苏州)有限公司 | Electric expansion valve |
| CN105822809B (en) * | 2016-05-26 | 2019-05-03 | 上海舜华新能源系统有限公司 | A kind of electromagnetic actuator for being installed on high pressure gas and integrating cylinder valve |
| CN106939950B (en) * | 2017-04-28 | 2023-03-14 | 中国电子科技集团公司第四十研究所 | Self-pressure-relief fluid connector |
| CN109139591B (en) * | 2018-09-25 | 2020-03-10 | 中国农业大学 | Mountain and hill self-adaptation pilot-operated type electro-hydraulic proportional threaded cartridge valve |
| CN115388056A (en) * | 2022-07-11 | 2022-11-25 | 福州大学 | Pressure trigger type pilot-operated switch valve |
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|---|---|---|---|---|
| US5769386A (en) * | 1995-06-22 | 1998-06-23 | Aisin Seiki Kabushiki Kaisha | Electromagnetic proportional pressure control valve |
| JP2840208B2 (en) * | 1995-03-30 | 1998-12-24 | シーケーディ株式会社 | Cartridge valve |
| CN1386992A (en) * | 2002-05-24 | 2002-12-25 | 浙江大学 | Control valve of high-pressure pneumatic switch |
| EP1832790A1 (en) * | 2004-11-22 | 2007-09-12 | Kabushiki Kaisha Kawasaki Precision Machinery | Electromagnetic valve device |
| CN102359600A (en) * | 2011-09-30 | 2012-02-22 | 河南航天压力元件有限公司 | Pilot electromagnetic valve |
| CN203604779U (en) * | 2012-11-15 | 2014-05-21 | 株式会社鹭宫制作所 | Pilot-operated type magnetic valve |
| CN204141016U (en) * | 2014-10-20 | 2015-02-04 | 无锡市华科力士水液压有限公司 | With the pressure pressure guiding type water electromagnetic switch valve that guide filters |
-
2014
- 2014-10-20 CN CN201410558693.6A patent/CN104315230B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2840208B2 (en) * | 1995-03-30 | 1998-12-24 | シーケーディ株式会社 | Cartridge valve |
| US5769386A (en) * | 1995-06-22 | 1998-06-23 | Aisin Seiki Kabushiki Kaisha | Electromagnetic proportional pressure control valve |
| CN1386992A (en) * | 2002-05-24 | 2002-12-25 | 浙江大学 | Control valve of high-pressure pneumatic switch |
| EP1832790A1 (en) * | 2004-11-22 | 2007-09-12 | Kabushiki Kaisha Kawasaki Precision Machinery | Electromagnetic valve device |
| CN102359600A (en) * | 2011-09-30 | 2012-02-22 | 河南航天压力元件有限公司 | Pilot electromagnetic valve |
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| CN204141016U (en) * | 2014-10-20 | 2015-02-04 | 无锡市华科力士水液压有限公司 | With the pressure pressure guiding type water electromagnetic switch valve that guide filters |
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| CN104315230A (en) | 2015-01-28 |
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