CN107178637B - A kind of safety valve with dual-seal function - Google Patents
A kind of safety valve with dual-seal function Download PDFInfo
- Publication number
- CN107178637B CN107178637B CN201710624298.7A CN201710624298A CN107178637B CN 107178637 B CN107178637 B CN 107178637B CN 201710624298 A CN201710624298 A CN 201710624298A CN 107178637 B CN107178637 B CN 107178637B
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- China
- Prior art keywords
- valve
- valve body
- valve block
- sealing ring
- face
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- 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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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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/061—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with positioning means
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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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/062—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces characterised by the geometry of the seat
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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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/46—Sealings with packing ring expanded or pressed into place by fluid pressure, e.g. inflatable packings
- F16J15/48—Sealings with packing ring expanded or pressed into place by fluid pressure, e.g. inflatable packings influenced by the pressure within the member to be sealed
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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
- F16K1/46—Attachment of sealing rings
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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
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/06—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with special arrangements for adjusting the opening pressure
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Architecture (AREA)
- Fluid Mechanics (AREA)
- Geometry (AREA)
- Safety Valves (AREA)
Abstract
The invention discloses a kind of safety valves with dual-seal function, including emergency valve seat and valve body, the emergency valve seat links together with valve body, pressure air through-hole is provided on the emergency valve seat, in the valve body, the exit of pressure air through-hole is provided with valve block, the valve block is connect with the guide rod being arranged in valve body, adjustment spring is socketed on the guide rod, the row's of being provided with gross blow hole on the valve body, in row's gross blow hole and valve body, valve block upper chambers are connected to, pass through the break-make of valve block control pressure air hole and chamber, the sealing ring that end face seal and self sealing structure are cooperatively formed with valve block is provided in the exit of the pressure air through-hole.The present invention has the effect of dual-seal at valve port, the sealing reliability of safety valve is effectively increased, and the safety valve of the present invention, in exhaust, the pressure air into valve block upper chambers can be such that valve block faster closes, the closing pressure at valve port is improved, pressure air is saved.
Description
Technical field
It is the invention belongs to safety valve technical field, more particularly to a kind of dual close for limiting having for air pressure size
Seal the safety valve of function.
Background technology
Safety valve is mainly used for limiting the size of air pressure, and the pressure more than setting value is arranged to air, pressure drop is made
As low as in range of set value, and setting value is adjustable.
Existing safety valve mainly has metal grinding face and metal valve port rubber parts to seal two kinds of forms.Wherein, metal grinding
The band that face is formed, after certain time uses, abradant surface will appear cut, and safety valve is made to sew, endurance quality
It is not high；And metal valve port rubber parts sealing structure, when pressure is close to gas vent pressure of safety valve, sealing performance can reduce, and work as
When having foreign matter between metal valve port and rubber parts, safety valve, which will produce, sews.
Invention content
It is an object of the invention to：In view of the above problems, it provides a kind of with double sealing effect, sealed reliable
The high safety valve of property.
The technical proposal of the invention is realized in this way：A kind of safety valve with dual-seal function, including safety valve
Seat and valve body, the emergency valve seat link together with valve body, and pressure air through-hole is provided on the emergency valve seat, special
Sign is：In the valve body, the exit of pressure air through-hole be provided with valve block, the valve block is led with what is be arranged in valve body
It is connected to bar, adjustment spring is socketed on the guide rod, the row's of being provided with gross blow hole on the valve body, row's gross blow hole
With in valve body, valve block upper chambers be connected to, by the break-make of valve block control pressure air hole and chamber, in the pressure air
The exit of through-hole is provided with the sealing ring that end face seal and self sealing structure are cooperatively formed with valve block.
Safety valve of the present invention with dual-seal function, is provided with outer shroud lug boss on the sealing ring
And inner ring lip, the outer shroud lug boss of the sealing ring and the end face compression fit of valve block form end face seal structure, described
The inner ring lip of sealing ring is pressed on valve block lower face under the action of pressure air and forms self sealing structure, the sealing ring
Outer shroud lug boss and inner ring lip are sealed the end face of valve block.
Safety valve of the present invention with dual-seal function, upper, annular is provided on the emergency valve seat
The superstructure of slot and lower annular recess, the sealing ring is placed in the upper, annular slot of emergency valve seat, the sealing ring
Lower part annulus stop ledge is placed in the lower annular recess of emergency valve seat.
Safety valve of the present invention with dual-seal function, the sealing ring in its natural state, outer shroud
Boss is in outside the upper, annular slot of emergency valve seat, and the height of outer shroud lug boss protrusion is higher than the end face of emergency valve seat, when
When valve block compresses the outer shroud lug boss of sealing ring, the outer shroud lug boss of the sealing ring, which generates certain deformation and overlayed, is pacifying
In the upper, annular slot of full valve seat.
Safety valve of the present invention with dual-seal function, the outer shroud lug boss of the sealing ring are arc-shaped
Structure, the outer shroud lug boss are clamped to form end face seal structure by the step of valve block and emergency valve seat, the inner ring lip quilt
Pressure air is pressed on valve block end face and forms self sealing structure, and the end face seal structure and self sealing structure are mutual independently of each other not
It influences, and is the double sealing structure formed to same seal face.
Safety valve of the present invention with dual-seal function, row's gross blow hole is oblique on valve body to be divided into
It sets.
Safety valve of the present invention with dual-seal function, is provided with guiding between the valve block and valve body
Set.
Safety valve of the present invention with dual-seal function, described guide rod one end are pressed in valve block,
Other end sliding sleeve is connected to adjustment swivel nut, and the adjustment swivel nut periphery is threadedly coupled with valve interior wall, the adjustment spring one end
It is resisted against the step end face of guide rod, the other end is resisted against the end face of adjustment swivel nut, by adjusting axis of the swivel nut in valve body
To position, with the preload pressure of adjustment adjustment spring.
Safety valve of the present invention with dual-seal function, is provided with and valve body above the adjustment swivel nut
The nut of connection is provided with the spiracle being connected to the spring housing on valve body top on the valve body.
The present invention can form the sealing ring of end face seal and self sealing structure by being arranged at valve port with valve block, make valve
Have the effect of dual-seal at mouthful, to effectively increase the sealing reliability of safety valve, avoids safety valve generation and sew
The problem of, and the safety valve of the present invention, in exhaust, the pressure air into valve block upper chambers can make valve block faster
It closes, improves the closing pressure at valve port, save pressure air.
Description of the drawings
Fig. 1 is the structural schematic diagram of the present invention.
Fig. 2 is the structural schematic diagram of sealing ring in the present invention.
It is marked in figure：1 is emergency valve seat, and 1a is upper, annular slot, and 1b is lower annular recess, and 2 be valve body, and 3 is empty for pressure
Vent hole, 4 be valve block, and 5 be guide rod, and 6 be adjustment spring, and 7 be row's gross blow hole, and 8 be chamber, and 9 be sealing ring, and 9a is outer ring convex
The portion of rising, 9b are inner ring lip, and 10 be adjustment swivel nut, and 11 be nut, and 12 be spiracle, and 13 be guide sleeve.
Specific implementation mode
Below in conjunction with the accompanying drawings, the present invention is described in detail.
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
As shown in Figure 1, a kind of safety valve with dual-seal function, including emergency valve seat 1 and valve body 2, the safety
Valve seat 1 links together with valve body 2, and pressure air through-hole 3 is provided on the emergency valve seat 1, in the valve body 2, pressure
The exit of power air hole 3 is provided with valve block 4, and guide sleeve 13, the valve block 4 are provided between the valve block 4 and valve body 2
It is connect with the guide rod 5 being arranged in valve body 2, adjustment spring 6 is socketed on the guide rod 5, is arranged on the valve body 2
There are row's gross blow hole 7, row's gross blow hole 7 to be arranged obliquely on valve body 2, makes it have certain dust-proof, waterproof effect, the row
In gross blow hole 7 and valve body 2,4 upper chambers 8 of valve block be connected to, by the break-make of 4 control pressure air hole 3 and chamber 8 of valve block,
The sealing ring that end face seal and self sealing structure are cooperatively formed with valve block 4 is provided in the exit of the pressure air through-hole 3
9, impact force when valve block is beated will not have damaging influence, endurance quality more preferable the sealing performance of sealing ring.
As shown in Fig. 2, being provided with outer shroud lug boss 9a and inner ring lip 9b, the sealing ring 9 on the sealing ring 9
The end face compression fit of outer shroud lug boss 9a and valve block 4 form end face seal structure, the inner ring lip 9b of the sealing ring 9 exists
It is pressed on 4 lower face of valve block under the action of pressure air and forms self sealing structure, the outer shroud lug boss 9a of the sealing ring 9 and interior
Ring lip 9b is sealed the end face of valve block 4.
Wherein, upper, annular slot 1a and lower annular recess 1b, the sealing ring 9 are provided on the emergency valve seat 1
Superstructure be placed in the upper, annular slot 1a of emergency valve seat 1, the lower part annulus stop ledge of the sealing ring 9 is placed in safety
In the lower annular recess 1b of valve seat 1, in its natural state, outer shroud lug boss 9a is located at the upper of emergency valve seat 1 to the sealing ring 9
Outside portion annular groove 1a, and the height of outer shroud lug boss 9a protrusions is higher than the end face of emergency valve seat 1, when valve block 4 will be outside sealing ring 9
When ring lug boss 9a is compressed, the outer shroud lug boss 9a of the sealing ring 9 generates certain deformation and is overlayed in the upper of emergency valve seat 1
In portion annular groove 1a.
In the present embodiment, the outer shroud lug boss 9a of the sealing ring 9 is arc-shaped structure, the outer shroud lug boss 9a quilts
The step of valve block 4 and emergency valve seat 1 clamps to form end face seal structure, and the inner ring lip 9b is pressed on valve block by pressure air
4 end faces form self sealing structure, and the end face seal structure and self sealing structure are independent of each other, and are to same close independently of each other
The double sealing structure that sealing end face is formed, in pressure air into fashionable, is made if that is, end face seal structure fails by pressure air
Sealing structure, the feelings for effectively avoiding pressure air from sewing are formed on inner ring lip, making inner ring lip be pressed on valve block end face
Condition.
Wherein, 5 one end of the guide rod is pressed in valve block 4, and other end sliding sleeve is connected to adjustment swivel nut 10, described
Adjustment 10 periphery of swivel nut is connect with 2 inner thread of valve body, and 6 one end of the adjustment spring is resisted against the step end face of guide rod 5,
The other end is resisted against the end face of adjustment swivel nut 10, by adjusting axial position of the swivel nut 10 in valve body 2, to adjust adjustment spring
6 preload pressure is provided with the nut 11 being connect with valve body 2 above the adjustment swivel nut 10, can prevent in foreign matter intrusion valve
Portion is provided with the spiracle 12 being connected to the spring housing on 2 top of valve body on the valve body 2.
The present invention operation principle be：Pressure air enters from pressure air through hole, and sealing ring has inner ring lip, patch
Conjunction is being here formed as a self sealing structure, while sealing ring outer shroud is with valve block bottom surface when pressure air through-hole has pressure
One arc-shaped convex portion, is compressed to form end face seal by valve block, to form dual-seal band sealing structure.When pressure is more than
When setting value, pressure air pushes valve block to overcome adjustment spring resistance and move up, the band failure of sealing ring and valve block composition,
Pressure air flows to valve block upper chamber from pressure air through hole through open valve port, then the row's of flow direction gross blow hole drains into air.
The pressure air for flowing into valve block upper chamber forms back pressure above valve block, makes valve block that can close in time, improves and is closed at valve port
Pressure saves pressure air.
When needing to adjust initial set value, adjustment swivel nut is screwed in into valve body, setting value gradually increases, if swivel nut will be adjusted
Valve body is screwed out, then setting value is gradually reduced, and after setting value is adjusted in place, is locked by nut, is prevented set point change.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement etc., should all be included in the protection scope of the present invention made by within refreshing and principle.
Claims (7)
1. a kind of safety valve with dual-seal function, including emergency valve seat（1）And valve body（2）, the emergency valve seat（1）With
Valve body（2）It links together, in the emergency valve seat（1）On be provided with pressure air through-hole（3）, it is characterised in that：Described
Valve body（2）Interior, pressure air through-hole（3）Exit be provided with valve block（4）, the valve block（4）With setting in valve body（2）Interior
Guide rod（5）Connection, in the guide rod（5）On be socketed with adjustment spring（6）, in the valve body（2）On the row's of being provided with air
Hole（7）, row's gross blow hole（7）In valve body（2）On be arranged obliquely, row's gross blow hole（7）With valve body（2）Interior, valve block（4）
Upper chambers（8）Connection, passes through valve block（4）Control pressure air hole（3）With chamber（8）Break-make, in the pressure air
Through-hole（3）Exit be provided with and valve block（4）Cooperatively form the sealing ring of end face seal and self sealing structure（9）, described
Sealing ring（9）On be provided with outer shroud lug boss（9a）And inner ring lip（9b）, the sealing ring（9）Outer shroud lug boss（9a）
With valve block（4）End face compression fit form end face seal structure, the sealing ring（9）Inner ring lip（9b）In pressure air
Under the action of be pressed on valve block（4）Lower face forms self sealing structure, the sealing ring（9）Outer shroud lug boss（9a）And inner ring
Lip（9b）To valve block（4）End face be sealed.
2. the safety valve according to claim 1 with dual-seal function, it is characterised in that：In the emergency valve seat
（1）On be provided with upper, annular slot（1a）And lower annular recess（1b）, the sealing ring（9）Superstructure be placed in safety valve
Seat（1）Upper, annular slot（1a）It is interior, the sealing ring（9）Lower part annulus stop ledge be placed in emergency valve seat（1）Lower part
Annular groove（1b）It is interior.
3. the safety valve according to claim 2 with dual-seal function, it is characterised in that：The sealing ring（9）
Under natural conditions, outer shroud lug boss（9a）Positioned at emergency valve seat（1）Upper, annular slot（1a）Outside, and outer shroud lug boss（9a）
The height of protrusion is higher than emergency valve seat（1）End face, work as valve block（4）By sealing ring（9）Outer shroud lug boss（9a）When compression, institute
State sealing ring（9）Outer shroud lug boss（9a）It generates certain deformation and is overlayed in emergency valve seat（1）Upper, annular slot（1a）
It is interior.
4. the safety valve according to claim 1 with dual-seal function, it is characterised in that：The sealing ring（9）'s
Outer shroud lug boss（9a）It is arc-shaped structure, the outer shroud lug boss（9a）By valve block（4）And emergency valve seat（1）Step clamp
Form end face seal structure, the inner ring lip（9b）Valve block is pressed on by pressure air（4）End face forms self sealing structure, institute
It states end face seal structure and self sealing structure is independent of each other independently of each other, and be the dual-seal knot formed to same seal face
Structure.
5. the safety valve according to claim 1 with dual-seal function, it is characterised in that：In the valve block（4）With
Valve body（2）Between be provided with guide sleeve（13）.
6. the safety valve as claimed in any of claims 1 to 5 with dual-seal function, it is characterised in that：Institute
State guide rod（5）One end is pressed on valve block（4）On, other end sliding sleeve is connected to adjustment swivel nut（10）, the adjustment swivel nut
（10）Periphery and valve body（2）Inner thread connects, the adjustment spring（6）One end is resisted against guide rod（5）Step end face,
The other end is resisted against adjustment swivel nut（10）End face, by adjusting swivel nut（10）In valve body（2）Interior axial position, to adjust
Whole spring（6）Preload pressure.
7. the safety valve according to claim 6 with dual-seal function, it is characterised in that：In the adjustment swivel nut
（10）Top is provided with and valve body（2）The nut of connection（11）, in the valve body（2）On be provided with and valve body（2）The bullet on top
The spiracle of spring room connection（12）.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710624298.7A CN107178637B (en) | 2017-07-27 | 2017-07-27 | A kind of safety valve with dual-seal function |
| PCT/CN2017/115382 WO2019019523A1 (en) | 2017-07-27 | 2017-12-11 | Safety valve having double-sealing function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710624298.7A CN107178637B (en) | 2017-07-27 | 2017-07-27 | A kind of safety valve with dual-seal function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107178637A CN107178637A (en) | 2017-09-19 |
| CN107178637B true CN107178637B (en) | 2018-08-31 |
Family
ID=59838594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710624298.7A Active CN107178637B (en) | 2017-07-27 | 2017-07-27 | A kind of safety valve with dual-seal function |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN107178637B (en) |
| WO (1) | WO2019019523A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102015226610A1 (en) * | 2015-12-23 | 2017-06-29 | Robert Bosch Gmbh | Housing component with a hydraulic line |
| CN107178637B (en) * | 2017-07-27 | 2018-08-31 | 眉山中车制动科技股份有限公司 | A kind of safety valve with dual-seal function |
| CN113154062B (en) * | 2021-04-08 | 2022-09-13 | 上海空间推进研究所 | Stepped sealing structure and valve body structure suitable for large pressure span |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2627233A1 (en) * | 1976-06-18 | 1977-12-29 | Pier Armaturen Gmbh | SAFETY VALVE |
| CN201202859Y (en) * | 2008-05-08 | 2009-03-04 | 王元清 | Main valve seal structure of high pressure leading safety valve |
| CN201461935U (en) * | 2009-07-30 | 2010-05-12 | 南方天合底盘***有限公司 | High-intensity sealing leather collar |
| CN201575147U (en) * | 2009-12-09 | 2010-09-08 | 天津市富赛克阀门有限公司 | U-shaped combined seal ring |
| CN201909064U (en) * | 2010-11-19 | 2011-07-27 | 四川制动科技股份有限公司 | Novel bidirectional valve |
| CN202510732U (en) * | 2012-03-14 | 2012-10-31 | 浙江飞峰阀门有限公司 | Pressure regulating valve |
| CN203098277U (en) * | 2013-02-25 | 2013-07-31 | 杭州儒燕科技开发有限公司 | Oil outlet cavity sealing ring of lower cover body of gear hydraulic pump |
| CN205388158U (en) * | 2016-01-31 | 2016-07-20 | 山东莱德机械有限公司 | Self -sealing stop valve |
| CN206943515U (en) * | 2017-07-27 | 2018-01-30 | 眉山中车制动科技股份有限公司 | A kind of safety valve with dual-seal function |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107178637B (en) * | 2017-07-27 | 2018-08-31 | 眉山中车制动科技股份有限公司 | A kind of safety valve with dual-seal function |
-
2017
- 2017-07-27 CN CN201710624298.7A patent/CN107178637B/en active Active
- 2017-12-11 WO PCT/CN2017/115382 patent/WO2019019523A1/en active Application Filing
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2627233A1 (en) * | 1976-06-18 | 1977-12-29 | Pier Armaturen Gmbh | SAFETY VALVE |
| CN201202859Y (en) * | 2008-05-08 | 2009-03-04 | 王元清 | Main valve seal structure of high pressure leading safety valve |
| CN201461935U (en) * | 2009-07-30 | 2010-05-12 | 南方天合底盘***有限公司 | High-intensity sealing leather collar |
| CN201575147U (en) * | 2009-12-09 | 2010-09-08 | 天津市富赛克阀门有限公司 | U-shaped combined seal ring |
| CN201909064U (en) * | 2010-11-19 | 2011-07-27 | 四川制动科技股份有限公司 | Novel bidirectional valve |
| CN202510732U (en) * | 2012-03-14 | 2012-10-31 | 浙江飞峰阀门有限公司 | Pressure regulating valve |
| CN203098277U (en) * | 2013-02-25 | 2013-07-31 | 杭州儒燕科技开发有限公司 | Oil outlet cavity sealing ring of lower cover body of gear hydraulic pump |
| CN205388158U (en) * | 2016-01-31 | 2016-07-20 | 山东莱德机械有限公司 | Self -sealing stop valve |
| CN206943515U (en) * | 2017-07-27 | 2018-01-30 | 眉山中车制动科技股份有限公司 | A kind of safety valve with dual-seal function |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107178637A (en) | 2017-09-19 |
| WO2019019523A1 (en) | 2019-01-31 |
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