CN204161346U - Anti-malfunctioning four control main brake valves - Google Patents
Anti-malfunctioning four control main brake valves Download PDFInfo
- Publication number
- CN204161346U CN204161346U CN201420482068.3U CN201420482068U CN204161346U CN 204161346 U CN204161346 U CN 204161346U CN 201420482068 U CN201420482068 U CN 201420482068U CN 204161346 U CN204161346 U CN 204161346U
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- malfunctioning
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- piston
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Abstract
The utility model discloses a kind of anti-malfunctioning four control main brake valves, comprise the upper valve body be tightly connected successively, middle valve body and two lower valve bodies, upper valve body be provided with back axle control into, air extractor duct and upper valve base and upper valve core, for controlling the service brake of vehicle rear axle, middle valve body be provided with propons control into, air extractor duct and middle spool and middle valve seat, for controlling the service brake of vehicle propons, twice valve bodies are respectively equipped with front-rear axle prevent malfunctioning control into, air extractor duct and lower valve base, bottom spool, middle piston, lower piston and lower piston cover etc., for coordinating high pressure gas by vehicle front-rear axle brake cylinder inflate compressed air brake cylinder in rapidly to discharge lower than during 0.55Mpa with other control cock assembly at motor vehicle braking system air pressure, energy stroage spring in brake cylinder is discharged and realizes emergency brake, effective compensation is carried out to the indicating brake action of vehicle, guarantee the driving safety of vehicle, avoid occurring the major traffic accidents such as personal casualty.
Description
Technical field
The utility model relates to a kind of brake control valve of Pneumatic braking system, says accurately and relates to a kind of anti-malfunctioning four control main brake valves.
Background technology
The safety of running car and the reliability of brake system closely related.And advantages such as Pneumatic braking system is high with its reliability, fast response time, low cost of manufacture, use is pollution-free and being widely used on Medium or severe type goods carrying vehicle and motor omnibus.Existing Pneumatic braking system is mainly provided with two and overlaps independently brake equipment, i.e. holding brake device and service braking device.During service brake, chaufeur controls two-chamber main brake valve by stretcher, high pressure gas in gascollecting cap cylinder are sent in each brake cylinder of the forward and backward bridge of vehicle through two-chamber main brake valve respectively, high pressure gas promote brake cylinder work, and the push rod of each brake cylinder stretches out and drives brake wheel to realize service brake.During parking, close park brake switch, the gas circuit between cut off high storage tank and back axle brake cylinder, meanwhile, the high pressure gas in back axle brake cylinder enter air, and energy stroage spring is released through push rod and drives brake wheel to realize braking during standstill.When removing parking, open park brake switch, the high pressure gas of gascollecting cap cylinder are entered in back axle brake cylinder by park brake switch, the pressure compressed energy-storage spring utilizing high pressure gas to produce, drive in pusher retracted brake cylinder, the braking effect of back axle brake cylinder is removed.In a particular application, for preventing because of the excessive damage drg of braking force and linkage part in vehicle travel process, the spring energy-storage braking in holding brake device and the main compression air brake in service braking device are forbidden overlapping and are used.The Medium or severe type goods carrying vehicle of Pneumatic braking system and motor omnibus are installed in the process of moving because of the wearing and tearing of brake component and the impact of ambient environment, there will be freeze blocking, system element ponding of cryogenic system pipeline ponding unavoidably to freeze the fault such as hair fastener, the gas leakage of high/low temperature system failure, car brakeing air pressure is easily caused to reduce, when braking pressure is lower than 0.55Mpa, car brakeing can be caused malfunctioning, thus cause major motor vehicle safety misadventure, therefore there is larger potential safety hazard in existing Pneumatic braking system.
Utility model content
The purpose of this utility model is: provide a kind of anti-malfunctioning four control main brake valves, these anti-malfunctioning four control main brake valves coordinate with other brake assemblies can when braking pressure reduces effective compensation indicating brake action, improve vehicle at infrabar or without the deceleration and stopping performance under atmospheric pressure state, improve the safety factor of vehicle.
The technical solution of the utility model is: a kind of anti-malfunctioning four control main brake valves, comprise the upper valve body be tightly connected, middle valve body and be located at two lower valve bodies of middle valve body lower portion side by side, in upper valve body, sealing is slidably fitted with upper piston cover, the bottom centre of upper piston cover is convexly equipped with the pressure head that end is sphere down, laterally gangbar is provided with in upper piston cover below, the arc groove inserted for pressure head is provided with at gangbar center, in upper piston cover, by rubber spring, tip-lever support is installed, between tip-lever support and upper valve body, is provided with dust boot;
Arranged side by side in middle valve body two groups of main brake valve modules are installed, described main brake valve module comprises the upper valve base be located in middle valve body, the upper valve core coordinated is opened and closed with this upper valve base sealing bottom surface, push up the upper valve core support spring be contained in bottom upper valve core and the hollow valve rod be actively located in upper valve base and upper valve core, the upper end radial loop of this hollow valve rod is provided with and seals the outer of bearing fit with middle valve interior wall and turn edge, upper chamber is provided with between hollow valve rod outer turns edge and described upper piston overlaps, the thimble of be in transmission connection hollow valve rod and gangbar is provided with in upper chamber, the upper end of thimble and the corresponding end of gangbar press tactile transmission to coordinate, the lower end of thimble is fixed in the top end opening of hollow valve rod, thimble offers the air extractor vent being communicated with upper chamber and hollow valve rod centre hole, be provided with in the upper below radial direction in turning edge outward of hollow valve rod and contact through upper valve base and upper valve core end face the driving step that transmission coordinates, to turn edge outward and between upper valve base, to be top-loaded with valve rod retracing spring driving step is outer, on the hollow valve rod sidewall driving step place and the lower end sidewall of hollow valve rod offers respectively the deflation hole being communicated with its centre hole, the front side wall of middle valve body is positioned at above and below upper valve base and is respectively equipped with main brake air extractor duct and main brake admission port, the open to atmosphere exhausr port of the company of being provided with on the rear wall of middle valve body, exhausr port being provided with eliminates the noise sieves and is covered with extraction hood, offers the exhaust passage being communicated with exhausr port and upper chamber in the rear wall of middle valve body,
On the front side wall of described lower valve body, vertical interval is provided with anti-malfunctioning air extractor duct and anti-malfunctioning admission port, the anti-malfunctioning control cock assembly that connect corresponding to described main brake valve module is installed in lower valve body, this anti-malfunctioning control cock assembly comprises the lower valve base being located at lower valve body top, the bottom spool be sealed and matched with this lower valve base end face and top are contained in the bottom spool support spring at bottom spool top, the lower piston cover sealing below lower valve base and be slidably fitted with diameter and be greater than lower valve base internal diameter is positioned in lower valve body, the top that lower piston overlaps is communicated with the gas channel of main brake admission port and anti-malfunctioning air extractor duct by lower valve base with being provided with between lower valve base, at lower piston cover center, anti-malfunctioning control plunger is installed, the top of anti-malfunctioning control plunger contacts with the lower surface of described hollow valve rod through lower valve base and is connected, be provided with to seal in bearing fit with anti-malfunctioning control plunger outer wall at the middle part of lower piston cover and keep off edge, anti-malfunctioning control plunger is positioned at gear and is provided with along below radial direction the outer convex edge overlapping inner wall sealing bearing fit with lower piston, on described interior gear edge, the sealed gas chamber communicated with described anti-malfunctioning admission port is formed between outer convex edge and lower valve interior wall, in lower piston cover above interior gear edge, sealing is slidably fitted with dummy piston, this dummy piston in the vertical direction overlaps spacing cooperation with lower piston, dummy piston support spring is top-loaded with between gear edge and dummy piston in lower piston cover, the upper end of this dummy piston upwards extends and is provided with bottom spool actuating sleeve, it is outer and be upward through described lower valve base and bottom spool sealing bottom surface top force fit that this bottom spool actuating sleeve slip cap is loaded on anti-malfunctioning control plunger, in lower piston cover bottom, also sealing is provided with spring socket sleeve, the bottom surface of this spring socket sleeve is spacing between overlapping with lower piston to be coordinated, the inwall of this spring socket sleeve seals bearing fit with anti-malfunctioning control plunger bottom outer wall, anti-malfunctioning piston support spring is top-loaded with between spring socket sleeve and anti-malfunctioning control plunger outer turns edge, base is fixed with at the sealed bottom of lower valve body, in the lower end sealing slip inserted base of described anti-malfunctioning control plunger, at base, balance air chamber is provided with between spring socket sleeve and lower piston cover, this balance air chamber is communicated with described gas channel by the interface channel be located in lower valve body, between base and spring socket sleeve, balance spring is top-loaded with at balance air chamber meta.
Be fixed with dividing plate in bottom radial direction between upper valve base and lower valve base of described middle valve body, dividing plate offer the through hole running through its upper and lower end face, described upper valve core support spring and bottom spool support spring push up respectively and are contained between dividing plate and upper and lower spool.
Anti-failure brake master valve structure of the present utility model is simple, easy to install, it is when motor vehicle braking system air pressure is lower than 0.55Mpa, chaufeur operates without the need to other, only deeply need step on brake pedal, this anti-failure brake master valve can be made to coordinate the high pressure gas inflated in compressed air brake cylinder by brake cylinder to discharge rapidly with other control cock assembly, thus make the release of the energy stroage spring in brake cylinder realize emergency brake, effective compensation is carried out to the indicating brake action of vehicle, guarantee the driving safety of vehicle, avoid occurring the major traffic accidents such as personal casualty, rear wall exhausr port being located at middle valve body not only can shorten air-flow and pass through distance, make exhaust more unobstructed, and can be coordinated with upper chamber by the through hole on thimble and form effect of easing stress, reduce the impact of air-flow, the area of exhausr port can not be accomplished larger by valve block internal diameter restriction simultaneously, thus reduce the noise of exhaust generation further, improve exhaust noise silencing effect, anti-failure brake master valve of the present utility model solves existing vehicle in infrabar or the problem that there will be braking failure without air pressure, there is good Social benefit and economic benefit, have safe and reliable, the advantage that exhaust noise is little, be suitable at various lorry, passenger vehicle is installed and used.
Accompanying drawing explanation
Fig. 1 be the utility model prevent malfunctioning four control main brake valves partly cut open one of structural representation;
Fig. 2 be the utility model prevent malfunctioning four control main brake valves partly cut open structural representation two.
In figure, 1, upper valve body; 2, upper piston cover; 3, pressure head; 4, rubber spring; 5, tip-lever support; 6, dust protecting cap; 7, gangbar; 8, middle valve body; 9, upper valve base; 10, upper valve core; 11, upper valve core support spring; 12, hollow valve rod; 13, turn edge outward; 14, upper chamber; 15, thimble; 16, air extractor vent; 17, step is driven; 18, valve rod retracing spring; 19, deflation hole; 20, deflation hole; 21, main brake air extractor duct; 22, main brake admission port; 23, exhausr port; 24, noise elimination sieve; 25, extraction hood; 26, exhaust passage; 27, lower valve body; 28, lower valve base; 29, bottom spool; 30, bottom spool support spring; 31, lower piston cover; 32, interior gear edge; 33, anti-malfunctioning control plunger; 34, outer convex edge; 35, anti-malfunctioning admission port; 36, anti-malfunctioning air extractor duct; 37, dummy piston; 38, bottom spool actuating sleeve; 39, dummy piston support spring; 40, anti-malfunctioning piston support spring; 41, spring socket sleeve; 42, balance spring; 43, air chamber is balanced; 44, base; 45, dividing plate.
Detailed description of the invention
The specific embodiment of anti-malfunctioning four control main brake valves of the present utility model is as Fig. 1, shown in Fig. 2, it comprises the upper valve body 1 be tightly connected, middle valve body 8 and be located at two lower valve bodies 27 of middle valve body 8 bottom side by side, in upper valve body 1, sealing is slidably fitted with upper piston cover 2, the bottom centre of upper piston cover 2 is convexly equipped with the pressure head 3 that end is sphere down, laterally gangbar 7 is provided with in the below of upper piston cover 2, the arc groove inserted for pressure head 3 is provided with at the center of gangbar 7, in upper piston cover, 2 are provided with tip-lever support 5 by rubber spring 4, detain between tip-lever support 5 and upper valve body 1 and be provided with dust boot 6,
Be provided with two groups of main brake valve modules side by side in middle valve body 8, these two groups of main brake valve module structures are identical, and the present embodiment is for wherein one group of main brake valve module and describe in detail it.Specifically as shown in Figure 2, this main brake valve module comprise the upper valve base 9 be located in middle valve body 8, with this upper valve base 9 sealing bottom surface open and close coordinate upper valve core 10, push up the upper valve core support spring 11 be contained in bottom upper valve core 10 and the hollow valve rod 12 being actively located in upper valve base 9 and upper valve core 10 center, the front side wall of middle valve body 8 is interval with the main brake admission port 22 and the main brake air extractor duct 21 that are controlled connection or disconnection by this main brake valve module, wherein, main brake air extractor duct 21 is located at the top of upper valve base 9, and main brake admission port 22 is located at the below of upper valve base 9.Be provided with in the upper end radial loop of hollow valve rod 12 and turn edge 13 with middle the outer of valve body 8 inner wall sealing bearing fit, hollow valve rod 12 outer turn edge 13 and upper piston overlap 2 between be provided with upper chamber 14, the thimble 15 of be in transmission connection hollow valve rod 12 and gangbar 7 is provided with in upper chamber 14, the upper end of this thimble 15 and the corresponding end of gangbar 7 press tactile transmission to coordinate, the lower end of thimble 15 is fixed in the top end opening of hollow valve rod 12, thimble 15 offers the air extractor vent 16 being communicated with upper chamber 14 and hollow valve rod 12 centre hole, hollow valve rod 12 is positioned at its outer turn edge 13 below radial direction be provided with and contact through upper valve base 9 and upper valve core 10 end face the driving step 17 that transmission coordinates, turn edge between 13 and upper valve base 9 outward outside driving step 17 and be top-loaded with valve rod retracing spring 18.In the present embodiment, upper valve core 10 and upper valve base 9 form main brake valve mechanism, this main brake valve mechanism is in normally off under the effect of upper valve core support spring 11, and hollow valve rod 12 is in transmission connection by thimble 15 and gangbar 7 and forms the opener of main brake valve.On the sidewall that hollow valve rod 12 is positioned at drive table rank 17 place and the lower end sidewall of hollow valve rod 12 offers respectively the deflation hole 19,20 being communicated with its centre hole.The also open to atmosphere exhausr port 23 of the company of being provided with on the rear wall of middle valve body 8, exhausr port 23 is provided with noise elimination sieve 24 and is covered with extraction hood 25, offers the exhaust passage 26 being communicated with exhausr port 23 and upper chamber 14 in the rear wall of middle valve body 8.
The anti-malfunctioning control cock assembly that connect corresponding to above-mentioned main brake valve module is separately installed with in twice valve bodies 27, the anti-malfunctioning control cock unit construction installed in twice valve bodies 27 is identical, and the present embodiment is described in detail for one of them anti-malfunctioning control cock assembly.As shown in Figure 2, its on the front side wall of lower valve body 27 vertical interval be provided with anti-malfunctioning air extractor duct 36 and anti-malfunctioning admission port 35, lower valve base 28 is provided with in lower valve body 27, the bottom spool 29 be sealed and matched with this lower valve base 28 end face and push up the bottom spool support spring 30 being contained in bottom spool 29 top, the below being positioned at lower valve base 28 in lower valve body 27 seals the lower piston cover 31 being slidably fitted with diameter and being greater than lower valve base 28 internal diameter, the top of lower piston cover 31 is communicated with the gas channel of main brake admission port 22 and anti-malfunctioning air extractor duct 36 by lower valve base 28 with being provided with between lower valve base 28, at the center of lower piston cover 31, anti-malfunctioning control plunger 33 is installed, the top of this anti-malfunctioning control plunger 33 contacts with the lower surface of hollow valve rod 12 through lower valve base 28 and is connected, being provided with to seal in bearing fit with anti-malfunctioning control plunger 33 outer wall at the middle part of lower piston cover 31 keeps off along 32, anti-malfunctioning control plunger 33 is positioned at gear along 32 below be radially provided with the outer convex edge 34 overlapping 31 inner wall sealing bearing fits with lower piston, at interior gear along 32, the sealed gas chamber communicated with anti-malfunctioning admission port 35 is formed between outer convex edge 34 and lower valve body 27 inwall, in lower piston cover 31 above interior gear is along 32, sealing is slidably fitted with dummy piston 37, this dummy piston 37 in the vertical direction and lower piston overlap 31 and spacingly to coordinate, dummy piston support spring 39 is top-loaded with between gear edge and dummy piston 37 in lower piston cover 31, the upper end of this dummy piston 37 upwards extends and is provided with bottom spool actuating sleeve 38, it is outer and be upward through the sealing bottom surface top force fit of lower valve base 28 and bottom spool 29 that this bottom spool actuating sleeve 38 slip cap is loaded on anti-malfunctioning control plunger 33.Also seal in the bottom of lower piston cover 31 and be provided with spring socket sleeve 41, the bottom surface of this spring socket sleeve 41 is spacing between overlapping 31 with lower piston to be coordinated, the inwall of this spring socket sleeve 41 seals bearing fit with anti-malfunctioning control plunger 33 bottom outer wall, is top-loaded with anti-malfunctioning piston support spring 40 outer the turning edge between 34 of spring socket sleeve 41 and anti-malfunctioning control plunger 33.Base 44 is fixed with at the sealed bottom of lower valve body 27, in the lower end sealing slip inserted base 44 of anti-malfunctioning control plunger 33, balance air chamber 43 is provided with between base 44, spring socket sleeve 41 and lower piston cover 31, this balance air chamber 43, by being located at interface channel in lower valve body 27 and said flow channel connection, is top-loaded with balance spring 42 in balance air chamber 43 between base 44 and spring socket sleeve 41.
In the present embodiment, its bottom at middle valve body 8 is laterally fixed with dividing plate 45 between upper valve base 9 and lower valve base 28, cavity between upper valve base 9 and lower valve base 28 is divided into upper and lower two parts by this dividing plate 45, dividing plate 45 offers the through hole running through its upper and lower end face, the upper and lower two parts cavity of dividing plate is communicated with, and upper valve core support spring 11 and bottom spool support spring 30 push up respectively and are contained on the upper and lower end face of dividing plate 45.
Claims (2)
1. anti-malfunctioning four control main brake valves, it is characterized in that, comprise the upper valve body be tightly connected, middle valve body and be located at two lower valve bodies of middle valve body lower portion side by side, in upper valve body, sealing is slidably fitted with upper piston cover, the bottom centre of upper piston cover is convexly equipped with the pressure head that end is sphere down, laterally gangbar is provided with in upper piston cover below, the arc groove inserted for pressure head is provided with at gangbar center, in upper piston cover, by rubber spring, tip-lever support is installed, between tip-lever support and upper valve body, is provided with dust boot;
Arranged side by side in middle valve body two groups of main brake valve modules are installed, described main brake valve module comprises the upper valve base be located in middle valve body, the upper valve core coordinated is opened and closed with this upper valve base sealing bottom surface, push up the upper valve core support spring be contained in bottom upper valve core and the hollow valve rod be actively located in upper valve base and upper valve core, the upper end radial loop of this hollow valve rod is provided with and seals the outer of bearing fit with middle valve interior wall and turn edge, upper chamber is provided with between hollow valve rod outer turns edge and described upper piston overlaps, the thimble of be in transmission connection hollow valve rod and gangbar is provided with in upper chamber, the upper end of thimble and the corresponding end of gangbar press tactile transmission to coordinate, the lower end of thimble is fixed in the top end opening of hollow valve rod, thimble offers the air extractor vent being communicated with upper chamber and hollow valve rod centre hole, be provided with in the upper below radial direction in turning edge outward of hollow valve rod and contact through upper valve base and upper valve core end face the driving step that transmission coordinates, to turn edge outward and between upper valve base, to be top-loaded with valve rod retracing spring driving step is outer, on the hollow valve rod sidewall driving step place and the lower end sidewall of hollow valve rod offers respectively the deflation hole being communicated with its centre hole, the front side wall of middle valve body is positioned at above and below upper valve base and is respectively equipped with main brake air extractor duct and main brake admission port, the open to atmosphere exhausr port of the company of being provided with on the rear wall of middle valve body, exhausr port being provided with eliminates the noise sieves and is covered with extraction hood, offers the exhaust passage being communicated with exhausr port and upper chamber in the rear wall of middle valve body,
On the front side wall of described lower valve body, vertical interval is provided with anti-malfunctioning air extractor duct and anti-malfunctioning admission port, the anti-malfunctioning control cock assembly that connect corresponding to described main brake valve module is installed in lower valve body, this anti-malfunctioning control cock assembly comprises the lower valve base being located at lower valve body top, the bottom spool be sealed and matched with this lower valve base end face and top are contained in the bottom spool support spring at bottom spool top, the lower piston cover sealing below lower valve base and be slidably fitted with diameter and be greater than lower valve base internal diameter is positioned in lower valve body, the top that lower piston overlaps is communicated with the gas channel of main brake admission port and anti-malfunctioning air extractor duct by lower valve base with being provided with between lower valve base, at lower piston cover center, anti-malfunctioning control plunger is installed, the top of anti-malfunctioning control plunger contacts with the lower surface of described hollow valve rod through lower valve base and is connected, be provided with to seal in bearing fit with anti-malfunctioning control plunger outer wall at the middle part of lower piston cover and keep off edge, anti-malfunctioning control plunger is positioned at gear and is provided with along below radial direction the outer convex edge overlapping inner wall sealing bearing fit with lower piston, on described interior gear edge, the sealed gas chamber communicated with described anti-malfunctioning admission port is formed between outer convex edge and lower valve interior wall, in lower piston cover above interior gear edge, sealing is slidably fitted with dummy piston, this dummy piston in the vertical direction overlaps spacing cooperation with lower piston, dummy piston support spring is top-loaded with between gear edge and dummy piston in lower piston cover, the upper end of this dummy piston upwards extends and is provided with bottom spool actuating sleeve, it is outer and be upward through described lower valve base and bottom spool sealing bottom surface top force fit that this bottom spool actuating sleeve slip cap is loaded on anti-malfunctioning control plunger, in lower piston cover bottom, also sealing is provided with spring socket sleeve, the bottom surface of this spring socket sleeve is spacing between overlapping with lower piston to be coordinated, the inwall of this spring socket sleeve seals bearing fit with anti-malfunctioning control plunger bottom outer wall, anti-malfunctioning piston support spring is top-loaded with between spring socket sleeve and anti-malfunctioning control plunger outer turns edge, base is fixed with at the sealed bottom of lower valve body, in the lower end sealing slip inserted base of described anti-malfunctioning control plunger, at base, balance air chamber is provided with between spring socket sleeve and lower piston cover, this balance air chamber is communicated with described gas channel by the interface channel be located in lower valve body, between base and spring socket sleeve, balance spring is top-loaded with at balance air chamber meta.
2. anti-malfunctioning four control main brake valves according to claim 1, it is characterized in that, dividing plate is fixed with in bottom radial direction between upper valve base and lower valve base of described middle valve body, dividing plate offers the through hole running through its upper and lower end face, described upper valve core support spring and bottom spool support spring push up respectively and are contained between dividing plate and upper and lower spool.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420482068.3U CN204161346U (en) | 2014-08-26 | 2014-08-26 | Anti-malfunctioning four control main brake valves |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420482068.3U CN204161346U (en) | 2014-08-26 | 2014-08-26 | Anti-malfunctioning four control main brake valves |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204161346U true CN204161346U (en) | 2015-02-18 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420482068.3U Expired - Fee Related CN204161346U (en) | 2014-08-26 | 2014-08-26 | Anti-malfunctioning four control main brake valves |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204161346U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104192122A (en) * | 2014-08-26 | 2014-12-10 | 王勤黄 | Anti-failure quadruple-control master brake valve |
-
2014
- 2014-08-26 CN CN201420482068.3U patent/CN204161346U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104192122A (en) * | 2014-08-26 | 2014-12-10 | 王勤黄 | Anti-failure quadruple-control master brake valve |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150218 Termination date: 20150826 |
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| EXPY | Termination of patent right or utility model |