CN103950447A - Emergency relay valve of electrically controlled trailer - Google Patents
Emergency relay valve of electrically controlled trailer Download PDFInfo
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- CN103950447A CN103950447A CN201410197504.7A CN201410197504A CN103950447A CN 103950447 A CN103950447 A CN 103950447A CN 201410197504 A CN201410197504 A CN 201410197504A CN 103950447 A CN103950447 A CN 103950447A
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Abstract
The invention discloses an emergency relay valve of an electrically controlled trailer. The emergency relay valve comprises an upper cap, a valve body, a relay piston, a valve component, an inflation joint, a control joint, a brake joint and the like, wherein the upper side of the relay piston which is sealed in a valve body inner cavity serves as a positive pressure chamber, and the lower side of the relay piston serves as a reverse pressure chamber; the upper surface area of the relay piston located in the positive pressure chamber is larger than the lower surface area thereof in the reverse pressure chamber; a gas compensating pipeline communicated with the inner cavity at the lower part of the valve body is communicated with the reverse pressure chamber through an electromagnetic valve. After the adoption of an electric integration technology, a driver can manually convert trailer control pressure according to the trailer situation of heavy load and no load. The emergency relay valve is excellent in brake coordination and reliability. The emergency relay valve of the electrically controlled trailer is simple in structure, stable in performance, convenient to mount, strong in applicability, strong in social benefits and economic benefits, wide in market prospect, and easy to popularize.
Description
Technical field
The present invention relates to be pulled the urgent servo technical field of trailer, particularly relate to a kind of electrically controlled trailer emergency relay valve that is pulled, be mainly applicable to various types of gas brakings and be pulled trailer.
Background technology
Due to tractor and trailer be by rotating disk, be connected to form can two body bascules, in order to guarantee its insensitivity, particularly when heavy duty is braked, in order not make the inertia of trailer push away by force tractor, cause the generation of the phenomenons such as overturning, front and back two folded bodies, in prior art, braking control air pressure is set as to trailer and gets over front haulage headstock, form pressure reduction.Because the quantitative relationship of pressure reduction can not change with trailer load condition, trailer braking protection valve is urgent, though can reach trailer braking protection valve effect during heavy duty, but when unloaded, trailer afterbody total mass is low, tire road pavement adhesion value is little, during braking, easily cause trailer car tyre locking rapidly, aggravation tire abrasion, the trailer whipping under locking state causes that traffic accident etc. all can bring major traffic accidents and unnecessary loss.
Summary of the invention
The object of the invention is for the existing vehicle tyre locking problem rapidly that easily occurs while being pulled the unloaded emergency braking of trailer, a kind of electrically controlled trailer emergency relay valve that is pulled is provided, can meet and be pulled trailer when heavy duty and zero load, can automatically adjust braking differential pressure, reach optimum braking effect.
For achieving the above object, the present invention has adopted following technical scheme: a kind of electrically controlled trailer emergency relay valve, comprise upper cover, valve body, relay piston, valve member, and be arranged on the gas-charging connection of upper cover and control joint, be arranged on the braking joint of valve body bottom; Wherein, the upside of upper cover is provided with inflation tube chamber, and gas-charging connection is positioned at one end of inflation tube chamber, and the other end sealing of inflation tube chamber is fixed with plug, controls joint and is connected to inflation tube chamber sidewall; At appendix cavity inner sleeve, piston body is housed, between piston body and plug, is connected with thrust spring; On described piston body, be provided with near the left piston of gas-charging connection and the right piston of close plug, when gas-charging connection is inflated, only there is the sealing of left piston and appendix cavity wall contact and only have right piston while resetting and inflate tube chamber and seal and contact, and, during inflation right piston move to right make to control joint is communicated with upper cover cavity and while resetting right piston move to left and make to control joint and the isolation of upper cover cavity; Upper cover is connected with valve seal; Sealing suit relay piston in body cavity, between the upper surface of relay piston and upper cover, form between the lower surface of positive pressure chamber, relay piston and body cavity and form counter-pressure chamber, wherein relay piston is positioned at the indoor upper surface area of positive pressure and is greater than the lower surface area that it is positioned at counter-pressure chamber; The valve inner that is positioned at relay piston below is provided with valve box, valve member is positioned at valve box, top, valve box arranges valve port, and relay piston bottom arranges bottom conduit, and the lower edge diameter of this bottom conduit is less than the diameter of valve port for valve member is opened and closed to control; In valve body, be also provided with the tonifying Qi pipeline being communicated with valve body lower portion inner chamber, this tonifying Qi pipeline is communicated with described counter-pressure chamber, and is provided with the electromagnetic valve of controlling air compensation size between tonifying Qi pipe outlet and counter-pressure chamber entrance; Described electromagnetic valve comprises that one seals fixing terminal pad with described body wall, in terminal pad center, sleeve is housed, and is set with two-way valve rod in axial sliding in sleeve, between sleeve and two-way valve rod, is connected with retracing spring; The back-end sealing of sleeve is fixed with joint, is provided with exhaust branch road in joint, and exhaust branch road is communicated with described lower guide tube cavity by gas exhaust duct; The rear end of joint is fixed on insulation body by locking plate; The left end of described two-way valve rod and tonifying Qi pipe outlet form left valve, and the entrance of the right-hand member of two-way valve rod and exhaust branch road forms right valve; And between sleeve and two-way valve rod, be provided with gap, thereby make counter-pressure chamber be communicated with left valve and can be communicated with right valve; In described annular gap chamber between insulation body and sleeve, be provided with coil winding and connection terminal.
The left end of described piston body arranges inner chamber, is set with the check valve with gas-charging connection fitted seal in inner chamber.Intracavity sidewall at described piston body left end is provided with air extractor duct, and air extractor duct is positioned at the left end of left piston; In valve body one side, be provided with the gas ducting being communicated with trailer gaholder; The air extractor duct of piston body left end inner chamber is communicated with gas ducting.
Described valve member comprises that sealing shroud is fixed in the valve seat of bottom, valve box, is set with the valve of hollow in valve seat, and dock with valve port sealing valve upper end, between valve seat and valve, is connected with valve spring; The body cavity in valve port outside is communicated with braking joint, and the valve box of valve port inner side is communicated with inlet suction port, and valve cavity is communicated with as exhaust passage with described lower guide tube cavity.Lower port middle part at described valve seat is provided with dust-proof cushion by screw.
Based on above technical scheme, the present invention has following technique effect: electrically controlled trailer emergency relay valve adopts electric integrated technology, and chaufeur can be controlled air pressure according to heavy duty, unloaded manual switch trailer, has improved above-mentioned background technical disadvantages.This technology has good brake coordination and reliability; Electrically controlled trailer emergency relay valve performance simple in structure is stable, easy for installation.Electrically controlled trailer emergency relay valve superior performance, simple in structure, easy for installation, applicability is strong, has stronger Social benefit and economic benefit.Market outlook are wide, easily promote.
Accompanying drawing explanation
Fig. 1 is cross-sectional view of the present invention;
Fig. 2 is the A-A cross-sectional view of Fig. 1;
Fig. 3 is the birds-eye view of Fig. 1.
Number in the figure is expressed as: 1. screw, 2. flat gasket, 3. dust-proof cushion, 4. circlip, 5. O shape is enclosed, 6. valve spring, 7. O shape is enclosed, 8. valve seat, 9. valve, 10. trip ring, 11. O shape circles, 12. retracing springs, 13. O shape circles, 14. relay pistons, 15. O shape circles, 16. O shape circles, 17. upper covers, 18. steel balls, 19. valve bodies, 20. pressing plates, 21. hog frames, 22. insulation cover bodies, 23. coil winding, 24. planar sealing pads, 25. terminal pads, 26. retracing springs, 27. two-way valve rods, 28. sleeves, 29. O shape circles, 30. joints, 31. captive nuts, 32. locking plates, 33. O shape circles, 34. plugs, 35. O shape circles, 36. gas-charging connections, 37. O shape circles, 38. valve ports, 39. planar sealing pads, 40. one-way cocks, 41. retracing springs, 42. O shape circles, 43. piston bodies, 44. O shape circles, 45. O shape circles, 46. plugs, 47. O shape circles, 48. thrust springs, 49. bolts, 50. safety washers, 51. binding posts, 52. tonifying Qi pipelines, 53a. controls joint one, 53b. controls joint two, 54. inflation tube chambers, 55. left pistons, 56. right pistons, 57. filling channels, 58. trailer gaholder joints, 59. positive pressure chambers, 60. counter-pressure chamber, 61 exhaust chambers, 62 bottom conduits, 63a. braking joint one, 63b. braking joint two, 64 gas exhaust ducts, 65 is air extractor duct, 66Wei valve box, 67 is valve port, and 68 is exhaust branch pipe, and 69 is circular cone three breach holes.
The specific embodiment
Electrically controlled trailer emergency relay valve is that its principle is with reference to accompanying drawing 1, accompanying drawing 2 and accompanying drawing 3 for controlling the auxiliary device of trailer braking protection valve.
The upside of upper cover 17 is provided with inflation tube chamber 54, is positioned at the tank connected gas-charging connection 36 of main car gas storage the left end of inflating tube chamber 54, and the right-hand member sealing of inflation tube chamber 54 is fixed with plug 46.For controlling the control joint 53a of brake and the sidewall that 53b is connected to inflation tube chamber 54.
In inflation tube chamber 54, be set with piston body 43, between piston body 43 and plug 46, be connected with thrust spring 48.The left end of piston body 43 arranges inner chamber, is set with the check valve with gas-charging connection fitted seal in inner chamber.Referring to accompanying drawing 2, source of the gas air pressure is inputted by the gas-charging connection 36 of upper cover 17, the check valve consisting of valve port 38, planar sealing pad 39, one-way cock 40, the retracing spring 40 being located on piston body 43.
Intracavity sidewall at piston body 43 left ends is provided with air extractor duct 65; A side at valve body 19 is provided with the gas ducting 57 being communicated with trailer gaholder joint 58; Air extractor duct 65 is communicated with gas ducting 57.The bottom of gas ducting 57 is communicated with valve box 66 is interior, is communicated with trailer gaholder joint 58 simultaneously.
When gas-charging connection 36 is during without air pressure, piston body 43 is moved to the left under thrust spring 48 effects, and now piston body 43 is in reset mode; When gas-charging connection 36 has air pressure, piston body 43 moves right.On piston body 43, be provided with near the left piston 55 of gas-charging connection and the right piston 56 of close plug.When gas-charging connection is inflated, only there is left piston 55 to contact with inflation tube chamber 54 inner wall sealings, during reset, only have right piston 56 to contact with 54 sealings of inflation tube chamber.And, during inflation right piston 56 move to right make to control joint 53a and 53b are communicated with upper cover cavity and while resetting right piston 56 move to left and make to control joint 53a and 53b and the isolation of upper cover cavity.Upper cover 17 is tightly connected with valve body 19.
Sealing suit relay piston 14 in the inner chamber of valve body 19, forms between the upper surface of relay piston 14 and upper cover 17 between the lower surface of positive pressure chamber 59, relay piston 14 and body cavity and forms counter-pressure chamber 60.The upper surface area that wherein relay piston 14 is positioned at positive pressure indoor 59 is greater than the lower surface area that it is positioned at counter-pressure chamber 60.
Valve member is positioned at valve box 66,66 tops, valve box arrange valve port 67, relay piston 14 bottoms arrange bottom conduit 62, the lower edge diameter of this bottom conduit 62 is less than the diameter of valve port 67, bottom conduit 62 is for opening and closing control to valve member, after relay piston 14 is depressed into a certain degree, bottom conduit 62 promotes valve 9 and liner moves down, and valve port 67 is opened.Valve member comprises that sealing shroud is fixed in the valve seat 8 of 66 bottoms, valve box, is set with the valve 9 of hollow in valve seat 8, and dock with valve port 67 sealings by liner valve 9 upper ends, between valve seat 8 and valve 9, is connected with valve spring 6; The body cavity in valve port 67 outsides is communicated with braking joint 63a and 63b, and the valve box of valve port 67 inner sides is communicated with gaholder inlet suction port, and valve cavity is communicated with bottom conduit 62 inner chambers, as exhaust passage.The zigzag passage that valve body 19, valve seat 8, valve 9, trip ring 10, retracing spring 6 and other rubber seal assembly form.Lower port middle part at described valve seat 8 is provided with dust-proof cushion by screw.
In valve body 19, be provided with the tonifying Qi pipeline 52 being communicated with valve body lower portion inner chamber, this tonifying Qi pipeline 52 is communicated with described counter-pressure chamber 60, and on tonifying Qi pipeline 52, is provided with the electromagnetic valve of controlling air compensation size.Particularly, referring to Fig. 1, be fixed with the intrinsic pressing plate 20 of a terminal pad 25 terminal pad outside cover with valve body 19 sidewall sealings, the center of terminal pad 25 is equipped with sleeve 28, in sleeve 28, be set with two-way valve rod 27 in axial sliding, between sleeve 28 and two-way valve rod 27, be connected with retracing spring 26.The back-end sealing of sleeve 28 is fixed with joint 30, is provided with exhaust branch road 68 in joint 30, and exhaust branch road 68 is communicated with described bottom conduit 62 inner chambers by gas exhaust duct 64.The left end of two-way valve rod 27 and 52 outlets of tonifying Qi pipeline form left valve, and the entrance of the right-hand member of two-way valve rod 27 and exhaust branch road 68 forms right valve; And between sleeve 28 and two-way valve rod 27, be provided with gap, thereby make counter-pressure chamber 60 be communicated with left valve and can be communicated with right valve.The rear end of joint 30 is fixed on insulation body 22 by locking plate 32, in annular gap chamber between insulation body 22 and sleeve 28, be provided with coil winding 23, intrinsic hog frame 21 is overlapped in coil winding 23 inner sides, and one end of coil winding is connected with plus terminal, and the other end is connected with vehicle frame.
When gas-charging connection 36 is set up air pressure, the packed-piston end face that O shape circle 42 forms, spacing by air pressure thrust piston body 43 other ends and plug 46 roundlet step surfaces, the keying valve that drives O shape circle 44 and axial piston body 43 to form is normally closed, and O shape circle 45 and upper cover 17 medial surfaces are in conjunction with (accompanying drawing 2) simultaneously: the keying valve that circular cone three breach holes 69 form is often opened.When speed-slackening signal air pressure input control joint 53a or 53b
,the gap of flowing through between circular cone three breach holes 69 and O shape circle 45, enter the malleation air chamber 59 being formed by relay piston 14, O shape circle 15, O shape circle 16, upper cover 17, valve body 19, promote the gap between the descending elimination relay piston 14 of relay piston 14 and valve 9, open valve 9, the porous such as air pressure Split flow brake joint 63a or 63b.Wherein little for controlling braking joint two hole paths of trailer front wheel braking, object is controlled trailer front wheel for choked flow, because of low factor after high before trailer, front tyre road pavement adhesive ability is little, front-wheel rapid heat dissipation in addition, brake facing is large to brake hubs friction coefficient, the front wheel brake easy locking that is quick on the draw.Electrically controlled trailer emergency relay valve after improvement can reach three bridge brake synchronous.The sealing disc that valve open is formed by relay piston 14 and O shape circle 13 simultaneously produces counter pressure, because relay piston 14 malleation air chamber gas pressure areas are greater than back-pressure air chamber, forms drawing head and trailer pressure reduction.During brake off, relay piston 14 is by retracing spring 12 auxiliary resets, and valve is closed simultaneously, and the former road of compressed air brake cylinder air pressure is returned, and by the gap between relay piston 14 and valve 9, through valve 9 endoporus and dust-proof cushion 3, discharges.
Electrically controlled trailer emergency relay valve has auto-lock function: when tractor is separated with trailer needs, before separation, should first disconnect gas-charging connection 36 sources of the gas.With reference to accompanying drawing 2: after disconnecting, one-way cock 40 is closed, thrust spring 48 resets piston body 43 and assembly thereof.The keying valve that the O shape of take circle 45 is main composition cuts out, and the keying valve that the O shape of take circle 44 is main composition is opened.The gap that the air pressure of the air extractor duct of piston body front end intracavity sidewall sees through between O shape circle 44 and upper cover 17 endoporus enters malleation air chamber 59, and air pressure promotes relay piston 14 and produces braking or be automatically locked.
Adopt two-position three way magnetic valve and its integration principle, with reference to accompanying drawing 1: mounting bracket or vehicle frame connection power cathode, with reference to accompanying drawing 3, be provided with source switch between plus terminal 51 and power supply; During unloaded driving, be communicated with power supply, with reference to accompanying drawing 1: the magnetic force that magnetic coil 23 produces forces two-way valve rod 27 to drive compression reseting springs 26, B end stroke is only located at the valve port contact on joint 30, spacing and sealing, A end valve mouth is opened simultaneously, air pressure enters the anti-air-pressure chamber being formed by O shape circle 13, relay piston 14, O shape circle 15 and valve body 19, reduces pressure reduction.Now export pressure reduction and enclose 13 position circle areas and deduct O shape and enclose 13 position circle areas by being located at O shape on relay piston 14, equal output pressure poor, this former road of function air pressure of brake off is returned.Can reach braking soft steadily, brake off speed is fast.PTO Power Take Off during heavy duty braking, contrary A end valve mouth is closed, and B end valve mouth is opened, relay piston 14 axial reciprocatings, counter-pressure chamber is communicated with the inner chamber of bottom conduit 62 by exhaust branch pipe and freeing pipe, and is in communication with the outside by dust-proof cushion 3, carries out exhaust or bleeds.Now brake in potent state control heavy duty stability or inertia that can be good.
Claims (7)
1. an electrically controlled trailer emergency relay valve, comprises upper cover, valve body, relay piston, valve member, and is arranged on the gas-charging connection of upper cover and controls joint, is arranged on the braking joint of valve body bottom; It is characterized in that: upper cover is connected with valve seal; Sealing suit relay piston in body cavity, between the upper surface of relay piston and upper cover, form between the lower surface of positive pressure chamber, relay piston and body cavity and form counter-pressure chamber, wherein relay piston is positioned at the indoor upper surface area of positive pressure and is greater than the lower surface area that it is positioned at counter-pressure chamber; The valve inner that is positioned at relay piston below is provided with valve box, valve member is positioned at valve box, top, valve box arranges valve port, and relay piston bottom arranges bottom conduit, and the lower edge diameter of this bottom conduit is less than the diameter of valve port for valve member is opened and closed to control; In valve body, be also provided with the tonifying Qi pipeline being communicated with valve body lower portion inner chamber, this tonifying Qi pipeline is communicated with described counter-pressure chamber, and is provided with the electromagnetic valve of controlling air compensation size between tonifying Qi pipe outlet and counter-pressure chamber entrance.
2. electrically controlled trailer emergency relay valve according to claim 1, it is characterized in that: described electromagnetic valve comprises that one seals fixing terminal pad with described body wall, in terminal pad center, sleeve is housed, in sleeve, be set with two-way valve rod in axial sliding, between sleeve and two-way valve rod, be connected with retracing spring; The back-end sealing of sleeve is fixed with joint, is provided with exhaust branch road in joint, and exhaust branch road is communicated with described lower guide tube cavity by gas exhaust duct; The rear end of joint is fixed on insulation body by locking plate; The left end of described two-way valve rod and tonifying Qi pipe outlet form left valve, and the entrance of the right-hand member of two-way valve rod and exhaust branch road forms right valve; And between sleeve and two-way valve rod, be provided with gap, thereby make counter-pressure chamber be communicated with left valve and can be communicated with right valve; In described annular gap chamber between insulation body and sleeve, be provided with coil winding and connection terminal.
3. electrically controlled trailer emergency relay valve according to claim 1, it is characterized in that: the upside of upper cover is provided with inflation tube chamber, gas-charging connection is positioned at one end of inflation tube chamber, and the other end sealing of inflation tube chamber is fixed with plug, controls joint and is connected to inflation tube chamber sidewall; At appendix cavity inner sleeve, piston body is housed, between piston body and plug, is connected with thrust spring; On described piston body, be provided with near the left piston of gas-charging connection and the right piston of close plug, when gas-charging connection is inflated, only there is the sealing of left piston and appendix cavity wall contact and only have right piston while resetting and inflate tube chamber and seal and contact, and, during inflation right piston move to right make to control joint is communicated with upper cover cavity and while resetting right piston move to left and make to control joint and the isolation of upper cover cavity.
4. electrically controlled trailer emergency relay valve according to claim 3, is characterized in that: the left end of described piston body arranges inner chamber, is set with the check valve with gas-charging connection fitted seal in inner chamber.
5. electrically controlled trailer emergency relay valve according to claim 4, is characterized in that: the intracavity sidewall at described piston body left end is provided with air extractor duct, and air extractor duct is positioned at the left end of left piston; In valve body one side, be provided with the gas ducting being communicated with trailer gaholder; The air extractor duct of piston body left end inner chamber is communicated with gas ducting.
6. electrically controlled trailer emergency relay valve according to claim 1, it is characterized in that: described valve member comprises that sealing shroud is fixed in the valve seat of bottom, valve box, in valve seat, be set with the valve of hollow, dock with valve port sealing valve upper end, between valve seat and valve, is connected with valve spring; The body cavity in valve port outside is communicated with braking joint, and the valve box of valve port inner side is communicated with inlet suction port, and valve cavity is communicated with as exhaust passage with described lower guide tube cavity.
7. electrically controlled trailer emergency relay valve according to claim 6, is characterized in that: the lower port middle part at described valve seat is provided with dust-proof cushion by screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410197504.7A CN103950447B (en) | 2014-05-12 | 2014-05-12 | Electrically controlled trailer emergency relay valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410197504.7A CN103950447B (en) | 2014-05-12 | 2014-05-12 | Electrically controlled trailer emergency relay valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103950447A true CN103950447A (en) | 2014-07-30 |
| CN103950447B CN103950447B (en) | 2016-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410197504.7A Expired - Fee Related CN103950447B (en) | 2014-05-12 | 2014-05-12 | Electrically controlled trailer emergency relay valve |
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| Country | Link |
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| CN (1) | CN103950447B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105736766A (en) * | 2014-12-09 | 2016-07-06 | 上海新力动力设备研究所 | Compact rapid two-position three-way electromagnetic directional valve provided with internal channel |
| CN112829735A (en) * | 2021-02-23 | 2021-05-25 | 浙江东星科技有限公司 | Emergency relay valve |
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| CN1413863A (en) * | 2002-11-22 | 2003-04-30 | 淄博龙达汽车配件制造有限公司 | Electric-controlled conversion relay valve |
| US6588856B2 (en) * | 2001-07-30 | 2003-07-08 | Bendix Commercial Vehicle Systems Llc | Modulator relay valve assembly and method |
| CN2626801Y (en) * | 2003-07-22 | 2004-07-21 | 万安集团有限公司 | Electromagnetic proportion relay valve of automobile |
| CN200964106Y (en) * | 2006-10-16 | 2007-10-24 | 赵忠初 | Transformation brake relay valve |
| CN203937667U (en) * | 2014-05-12 | 2014-11-12 | 中科富兰特股份有限公司 | Electrically controlled trailer emergency relay valve |
-
2014
- 2014-05-12 CN CN201410197504.7A patent/CN103950447B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6588856B2 (en) * | 2001-07-30 | 2003-07-08 | Bendix Commercial Vehicle Systems Llc | Modulator relay valve assembly and method |
| CN1413863A (en) * | 2002-11-22 | 2003-04-30 | 淄博龙达汽车配件制造有限公司 | Electric-controlled conversion relay valve |
| CN2626801Y (en) * | 2003-07-22 | 2004-07-21 | 万安集团有限公司 | Electromagnetic proportion relay valve of automobile |
| CN200964106Y (en) * | 2006-10-16 | 2007-10-24 | 赵忠初 | Transformation brake relay valve |
| CN203937667U (en) * | 2014-05-12 | 2014-11-12 | 中科富兰特股份有限公司 | Electrically controlled trailer emergency relay valve |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105736766A (en) * | 2014-12-09 | 2016-07-06 | 上海新力动力设备研究所 | Compact rapid two-position three-way electromagnetic directional valve provided with internal channel |
| CN105736766B (en) * | 2014-12-09 | 2018-03-09 | 上海新力动力设备研究所 | The built-in compact quick two-bit triplet solenoid directional control valve of passage |
| CN112829735A (en) * | 2021-02-23 | 2021-05-25 | 浙江东星科技有限公司 | Emergency relay valve |
| CN112829735B (en) * | 2021-02-23 | 2021-10-29 | 浙江东星科技有限公司 | Emergency relay valve |
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| Publication number | Publication date |
|---|---|
| CN103950447B (en) | 2016-06-08 |
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