CN108679280A - Vibration proof pilot operated safety valve - Google Patents
Vibration proof pilot operated safety valve Download PDFInfo
- Publication number
- CN108679280A CN108679280A CN201810931245.4A CN201810931245A CN108679280A CN 108679280 A CN108679280 A CN 108679280A CN 201810931245 A CN201810931245 A CN 201810931245A CN 108679280 A CN108679280 A CN 108679280A
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- CN
- China
- Prior art keywords
- valve
- pilot
- interference
- pressure
- chamber
- 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.)
- Pending
Links
- 238000010079 rubber tapping Methods 0.000 claims abstract description 21
- 238000007789 sealing Methods 0.000 claims abstract description 21
- 230000008676 import Effects 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 230000007423 decrease Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- 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
- F16K17/044—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 more than one spring
-
- 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
- F16K17/10—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 auxiliary valve for fluid operation of the main valve
-
- 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
- F16K17/164—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side and remaining closed after return of the normal pressure
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Safety Valves (AREA)
Abstract
The present invention relates to a kind of vibration proof pilot operated safety valve, including main valve, pilot valve, main valve includes main valve body, main valve seat, main valve clack, guide sleeve, main valve lid；Pilot valve includes pilot valve body, guide valve seat, pilot valve valve, pilot valve lid and pressure setting device, and pilot valve body is equipped with pressure tappings, pilot port and pressure relief opening, and pressure tappings are connected to by pressure pipe with main valve body intake channel, and pilot port is connected to by connecting pipe with plunger shaft；It is characterized in that：Uuper valve chamber and lower valve chamber are equipped in pilot valve body, guide valve seat is arranged between uuper valve chamber and lower valve chamber, and pilot valve valve is located in uuper valve chamber, and pressure tappings and pilot port are connected to lower valve chamber, and anti-interference device is arranged in the lower valve chamber between pressure tappings and pilot port.Under the non-fully open state of pilot valve, main valve clack will not act, and avoid work condition environment vibration that main valve clack is caused to open by mistake and open, there is the set-pressure in the case where vibrating operating mode to stablize, the good advantage of sealing reliability.Suitable for the vibrating conduits such as air compressor machine or the safety valve of containment system.
Description
Technical field
The invention belongs to valve fields, more particularly, to a kind of pilot operated safety valve.The present invention is suitable for air compressor machine etc.
The safety valve of vibrating conduit or containment system.
Background technology
Existing pilot operated safety valve, including main valve and pilot valve, by the open and close of pilot valve come the unlatching of control bound
The direct load formula structure of spring, the sealing means of pilot valve is mainly used to use merely with the working method of closing, pilot valve
The sealing means of metal and metal, the disadvantage is that：When using on the pipeline or container with vibration, pilot valve is easy to let out
Leakage, causes the pressure medium of main valve piston intracavitary to decline, and set-pressure stability is poor, causes main valve to leak or open by mistake and opens.
Invention content
For technological deficiency existing in the prior art, the present invention provides one kind in vibration operating mode in use, set-pressure
Stability is good, the good vibration proof pilot operated safety valve of sealing reliability.
Technical scheme of the present invention includes main valve, pilot valve, and main valve includes main valve body, main valve seat, main valve clack, guide sleeve, master
Valve deck installs spring in the plunger shaft constituted between main valve clack and guide sleeve, main valve lid；Pilot valve include pilot valve body, guide valve seat,
Pilot valve valve, pilot valve lid and pressure setting device, pilot valve body are equipped with pressure tappings, pilot port and pressure relief opening, and pressure tappings are by taking
Pressure pipe is connected to main valve body intake channel, and pilot port is connected to by connecting pipe with plunger shaft；It is characterized in that：It is equipped in pilot valve body
Uuper valve chamber and lower valve chamber, guide valve seat are arranged between uuper valve chamber and lower valve chamber, and pilot valve valve is located in uuper valve chamber, is arranged on guide valve seat
Rubber seal, pressure tappings and pilot port are connected to lower valve chamber, and anti-interference is arranged in the lower valve chamber between pressure tappings and pilot port
Device；The anti-interference device includes anti-interference spool, anti-interference valve seat, and anti-interference valve seat is fixedly mounted in lower valve chamber, exports and leads
Mouth connection, import is pressed to have and the mutually matched sealing surface in anti-interference spool upper surface, the external cylindrical surface and lower valve chamber of anti-interference spool
The dynamic cooperation of inner wall, lower end are connected to pressure tappings, and axial diversion is formed between the external cylindrical surface and lower valve cavity wall of anti-interference spool
Slot；Mandril is set between pilot valve valve lower face and anti-interference spool upper end, the mandril periphery and guide valve seat endoporus and anti-interference valve
It is formed respectively with diversion trench between seat endoporus.
Preferably, anti-interference spool is installed on by adjusting set in lower valve chamber, under adjusting set lower part is fixed on by tightening nut
In valve chamber, which there is external screw thread and internal thread, the internal thread of external screw thread and lower valve chamber lower end inner wall to cooperate
Connection, internal thread and the external screw thread of adjusting set lower part cooperate, and are equipped between adjusting set lower end and tightening nut lower face
Locking nut and gasket；Adjusting set top is equipped with vertical blind hole, and the region between the heart and the diaphragm hole bottom is connected to pressure tappings, and anti-interference spool is axially living
It is dynamic to be installed on the region between the heart and the diaphragm hole lower part, axial diversion slot, anti-interference valve seat are equipped between anti-interference spool periphery and the blind hole inner wall
Periphery, which is threadably secured, is installed on the region between the heart and the diaphragm hole top.
Preferably, tray is set between anti-interference spool and blind hole, tray has periphery and an interior circular hole, periphery with it is blind
Clearance fit between the inner wall of hole, anti-interference spool are plugged in the interior circular hole of tray, the radial direction in tray upper surface and anti-interference spool
O-ring seal is set between convex shoulder.
Preferably, pilot valve valve is mounted on by positioning sleeve and guide cylinder in uuper valve chamber, and positioning sleeve is fitted in upper valve by pilot valve lid
Intracavitary, guide cylinder are fitted between positioning sleeve lower face and guide valve seat upper surface, between pilot valve valve periphery and guide cylinder inner wall
Axial movement cooperation, guide cylinder, which is justified, is formed with several radial through-hole on wall, pilot valve valve lower face has and guide valve seat upper surface phase
The sealing surface mutually coordinated, pilot valve valve upper end are contacted across positioning sleeve centre bore with pressure setting device lower end.
The advantage of the invention is that：Guide valve seat is equipped with rubber seal, improves the resistance to shock of pilot valve sealing pair, and pilot valve is set
There is anti-interference device, under the non-fully open state of pilot valve, main valve clack will not act, and avoid work condition environment vibration that main valve clack is caused to miss
It opens, there is the set-pressure in the case where vibrating operating mode to stablize, the good advantage of sealing reliability.
Description of the drawings
Fig. 1 is the structural diagram of the present invention.
Specific implementation mode
Vibration proof pilot operated safety valve as shown in Figure 1, including main valve, pilot valve, main valve include main valve body 1, main valve seat 2,
Main valve clack 3, guide sleeve 4, main valve lid 7, the plunger shaft 6 constituted between main valve clack 3 and guide sleeve 4, main valve lid 7 is interior to install spring
5,3 periphery of main valve clack coordinates with 4 endoporus dynamic sealing of guide sleeve；Pilot valve includes pilot valve body 11, guide valve seat 18, pilot valve valve 22, leads
Valve deck 26 and pressure setting device, pilot valve body 11 are equipped with pressure tappings, pilot port and pressure relief opening 20, and pressure tappings pass through pressure pipe
8 are connected to 1 intake channel of main valve body, between pressure tappings and pressure pipe 8 be arranged filter screen 9, pilot port by connecting pipe 30 with
Plunger shaft 6 be connected to, pressure setting device use spring structure, by pre-compressed spring 25, adjusting screw rod 28, upper spring seat 27, under
Spring base 24 forms, and pre-compressed spring 25 is mounted between upper spring seat 27 and lower spring cup 24, and adjusting screw rod 28 is installed by screw thread
In the adjusting screw hole of pilot valve lid 26, lower end top pressure is equipped with dust cap 29, lower bullet in 27 upper surface center of upper spring seat, outside
24 lower face center of spring abutment is contacted with 22 upper end of pilot valve valve；It is characterized in that：It is equipped with uuper valve chamber and lower valve chamber in pilot valve body 11, leads
Valve seat 18 is arranged between uuper valve chamber and lower valve chamber, and pilot valve valve 22 is located in uuper valve chamber, and rubber seal is arranged on guide valve seat 18
19, using the elasticity of rubber seal 19, sealing performance when keeping vibrating between pilot valve valve 22 and rubber seal 19, pressure
Mouth and pilot port are connected to lower valve chamber, and anti-interference device is arranged in the lower valve chamber between pressure tappings and pilot port；The anti-interference dress
It sets including anti-interference spool 14, anti-interference valve seat 16, anti-interference valve seat 16 is fixedly mounted in lower valve chamber, and outlet is connected to pilot port,
Import have with the mutually matched sealing surface in 14 upper surface of anti-interference spool, anti-interference valve seat 16 outlet anti-interference spool 14 between uses
Mutually matched conical seal surface or ball face sealing face, external cylindrical surface and the lower valve cavity wall clearance fit of anti-interference spool 14, under
End is connected to pressure tappings, and axial diversion slot is formed between the external cylindrical surface and lower valve cavity wall of anti-interference spool 14, increases anti-interference
Medium flow field flux between 14 external cylindrical surface of spool and lower valve cavity wall；22 lower face of pilot valve valve and 14 upper end of anti-interference spool it
Between mandril 17 is set, be formed respectively with diversion trench between 16 endoporus of 17 periphery of mandril and 18 endoporus of guide valve seat and anti-interference valve seat,
Ensure the flow of media performance between 17 periphery of mandril and 16 endoporus of 18 endoporus of guide valve seat and anti-interference valve seat.
Anti-interference spool 14 is installed on by adjusting set 12 in lower valve chamber, under 12 lower part of adjusting set is fixed on by tightening nut 10
In valve chamber, which has external screw thread and internal thread, the internal thread phase interworking of external screw thread and lower valve chamber lower end inner wall
Connection is closed, internal thread and the external screw thread of 12 lower part of adjusting set cooperate, in 12 lower end of adjusting set and 10 lower face of tightening nut
Between be equipped with locking nut and gasket；12 top of adjusting set is equipped with vertical blind hole, and the region between the heart and the diaphragm hole bottom is connected to pressure tappings, anti-interference
Spool 14 is axial to be movably installed in the region between the heart and the diaphragm hole lower part, matches equipped with gap between 14 periphery of anti-interference spool and the blind hole inner wall
It closes, 16 periphery of anti-interference valve seat, which is threadably secured, is installed on the region between the heart and the diaphragm hole top, between 12 periphery of adjusting set and lower valve cavity wall
Equipped with sealing ring.By adjusting adjusting set 12 and the relative position in tightening nut 10, adjusts 14 sealing surface of anti-interference spool and resist
The distance between 16 sealing surface of valve seat is disturbed, resistance to shock is adjusted.
Between anti-interference spool 14 and blind hole be arranged tray 13, tray 13 have periphery and interior circular hole, periphery with it is blind
Clearance fit between the inner wall of hole, anti-interference spool 14 are plugged in the interior circular hole of tray 13, in 13 upper surface of tray and anti-interference spool
O-ring seal 15 is set between 14 radial convex shoulder.
Pilot valve valve 22 is mounted on by positioning sleeve 23 and guide cylinder 21 in uuper valve chamber, and positioning sleeve 23 is fitted in by pilot valve lid 26
In valve chamber, guide cylinder 21 is fitted between 18 upper surface of 23 lower face of positioning sleeve and guide valve seat, 22 periphery of pilot valve valve and guiding
Cooperation is moved axially between 21 inner walls of cylinder, guide cylinder 21, which is justified, is formed with several radial through-hole on wall, medium when pilot valve valve 22 is opened
Pressure relief opening 20 is flowed to from radial through-hole, 22 upper end of pilot valve valve passes through the lower bullet of 23 centre bore of positioning sleeve and pressure setting device lower end
Spring abutment 24 contacts.
When 1 import pressure medium of main valve body is in normal pressure value, anti-interference spool 14 leaves anti-interference by the pressure of mandril 17
16 sealing surface of valve seat, main valve inlet side medium by pressure pipe 8, the gap of 14 radial outside of anti-interference spool, anti-interference valve seat 16 with
Radial clearance between mandril 17, connecting pipe 30 enter in plunger shaft 6, medium of the main valve clack in main piston chamber 6 and spring 5 to
Under lower active force, 3 sealing surface compact main valve seat of main valve clack, 2 sealing surface is closed.
When 1 inlet side pressure medium of main valve body reaches presetting set-pressure value, pilot valve valve 22 is opened, plunger shaft 6
Interior medium is discharged by the radial clearance between connecting pipe 30, guide valve seat 18 and mandril 17 from pressure relief opening 20.While tray 13,
It is close to be move upwardly until that anti-interference spool 14 is formed with anti-interference valve seat 16 under the promotion of pilot valve inlet side medium for anti-interference spool 14
Envelope, the medium of pilot valve inlet side cannot be introduced into plunger shaft 6, when the pressure medium decline in plunger shaft 6, until in plunger shaft 6
Medium and spring 5 act on the downward power of main valve clack 3 less than main valve clack 3 by the upward active force of main valve inlet side medium
When, main valve clack 3 upwardly opens, main valve discharge.Pilot valve valve 22 is gradually reduced by the upward active force of lower dielectric at this time, pilot valve
Under active force of the valve 22 by pre-compressed spring 25, close downwards.Meanwhile mandril 17 pushes anti-interference spool 14 to move down disengaging anti-interference valve
16 sealing surfaces of seat, the medium of pilot valve inlet side reenter plunger shaft 6.When the medium of main valve inlet side drops to presetting return
When seat pressure, pilot valve valve 22 is formed with guide valve seat 18 and is sealed again, as Jie of pressure medium and main valve inlet side in plunger shaft 6
When matter pressure is consistent, main valve clack 3 declines and re-forms sealing with main valve seat 2, and main valve is closed.
Claims (4)
1. a kind of vibration proof pilot operated safety valve, including main valve, pilot valve, main valve include main valve body（1）, main valve seat（2）, main valve clack
（3）, guide sleeve（4）, main valve lid（7）, in main valve clack（3）With guide sleeve（4）, main valve lid（7）Between the plunger shaft that constitutes（6）It is interior
Spring is installed（5）；Pilot valve includes pilot valve body（11）, guide valve seat（18）, pilot valve valve（22）, pilot valve lid（26）It is filled with pressure setting
It sets, pilot valve body（11）It is equipped with pressure tappings, pilot port and pressure relief opening（20）, pressure tappings pass through pressure pipe（8）With main valve body（1）
Intake channel is connected to, and pilot port passes through connecting pipe（30）With plunger shaft（6）Connection；It is characterized in that：Pilot valve body（11）Inside it is equipped with
Uuper valve chamber and lower valve chamber, guide valve seat（18）It is arranged between uuper valve chamber and lower valve chamber, pilot valve valve（22）It is located in uuper valve chamber, pressure
Mouth and pilot port are connected to lower valve chamber, and anti-interference device is arranged in the lower valve chamber between pressure tappings and pilot port；The anti-interference dress
It sets including anti-interference spool（14）, anti-interference valve seat（16）, anti-interference valve seat（16）It is fixedly mounted in lower valve chamber, outlet and pilot port
Connection, import have and anti-interference spool（14）The mutually matched sealing surface in upper surface, anti-interference spool（14）External cylindrical surface under
Valve chamber inner wall clearance fit, lower end is connected to pressure tappings；In pilot valve valve（22）Lower face and anti-interference spool（14）It is set between upper end
Top set bar（17）, the mandril（17）Periphery and guide valve seat（18）Endoporus and anti-interference valve seat（16）Water conservancy diversion is formed respectively between endoporus
Slot.
2. vibration proof pilot operated safety valve according to claim 1, it is characterised in that：Anti-interference spool（14）Pass through adjusting set
（12）It is installed in lower valve chamber, adjusting set（12）Lower part is by tightening nut（10）It is fixed in lower valve chamber, the tightening nut 10 tool
There are external screw thread and internal thread, internal thread and adjusting set（12）The external screw thread of lower part cooperates；Adjusting set（12）Top is equipped with
Vertical blind hole, the region between the heart and the diaphragm hole bottom are connected to pressure tappings, anti-interference spool（14）Axially it is movably installed in the region between the heart and the diaphragm hole lower part, anti-interference valve
Seat（16）Periphery, which is threadably secured, is installed on the region between the heart and the diaphragm hole top, adjusting set（12）It is equipped between periphery and lower valve cavity wall close
Seal.
3. vibration proof pilot operated safety valve according to claim 2, it is characterised in that：Anti-interference spool（14）Between blind hole
Tray is set（13）, tray（13）With periphery and interior circular hole, clearance fit between periphery and blind hole inner wall, anti-interference valve
Core（14）It is plugged in tray（13）Interior circular hole in.
4. vibration proof pilot operated safety valve according to claim 1 or 2 or 3, it is characterised in that：Pilot valve valve（22）By positioning
Set（23）And guide cylinder（21）In uuper valve chamber, positioning sleeve（23）By pilot valve lid（26）It is fitted in uuper valve chamber, guide cylinder
（21）It is fitted in positioning sleeve（23）Lower face and guide valve seat（18）Between upper surface, pilot valve valve（22）Periphery and guide cylinder（21）
Cooperation, guide cylinder are moved axially between inner wall（21）It is formed with several radial through-hole, pilot valve valve on circle wall（22）Upper end passes through fixed
Position set（23）Centre bore is contacted with pressure setting device lower end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810931245.4A CN108679280A (en) | 2018-08-15 | 2018-08-15 | Vibration proof pilot operated safety valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810931245.4A CN108679280A (en) | 2018-08-15 | 2018-08-15 | Vibration proof pilot operated safety valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108679280A true CN108679280A (en) | 2018-10-19 |
Family
ID=63816238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810931245.4A Pending CN108679280A (en) | 2018-08-15 | 2018-08-15 | Vibration proof pilot operated safety valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108679280A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110230717A (en) * | 2019-07-12 | 2019-09-13 | 乐山市前沿油气设备制造有限公司 | Pilot operated safety valve |
| CN110645389A (en) * | 2019-01-15 | 2020-01-03 | 王欣 | Pilot operated safety valve |
| CN112360376A (en) * | 2020-12-10 | 2021-02-12 | 西南石油大学 | Blowout prevention check valve in spiral drill column |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998008015A1 (en) * | 1996-08-23 | 1998-02-26 | Flow Safe, Inc. | Pilot operated safety relief valve |
| US6318406B1 (en) * | 2000-03-14 | 2001-11-20 | Tyco Flow Control, Inc. | Pilot operated relief valve |
| CN102620017A (en) * | 2012-03-29 | 2012-08-01 | 天正阀门有限公司 | High-pressure electromagnetic pneumatic-control decompression valve |
| CN203240030U (en) * | 2013-05-09 | 2013-10-16 | 浙江精嘉阀门有限公司 | Pilot-operated type safety relief valve |
| CN204127415U (en) * | 2014-09-10 | 2015-01-28 | 天正阀门有限公司 | High-temperature pilot-operated type safety valve |
| CN105135015A (en) * | 2015-10-14 | 2015-12-09 | 开封市瑞发高中压阀门有限公司 | Pilot valve lower valve clack split-structure pilot operated safety valve |
| CN105864496A (en) * | 2016-05-27 | 2016-08-17 | 永阀门集团有限公司 | Backpressure-adjusting pilot operated safety valve |
-
2018
- 2018-08-15 CN CN201810931245.4A patent/CN108679280A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998008015A1 (en) * | 1996-08-23 | 1998-02-26 | Flow Safe, Inc. | Pilot operated safety relief valve |
| US6318406B1 (en) * | 2000-03-14 | 2001-11-20 | Tyco Flow Control, Inc. | Pilot operated relief valve |
| CN102620017A (en) * | 2012-03-29 | 2012-08-01 | 天正阀门有限公司 | High-pressure electromagnetic pneumatic-control decompression valve |
| CN203240030U (en) * | 2013-05-09 | 2013-10-16 | 浙江精嘉阀门有限公司 | Pilot-operated type safety relief valve |
| CN204127415U (en) * | 2014-09-10 | 2015-01-28 | 天正阀门有限公司 | High-temperature pilot-operated type safety valve |
| CN105135015A (en) * | 2015-10-14 | 2015-12-09 | 开封市瑞发高中压阀门有限公司 | Pilot valve lower valve clack split-structure pilot operated safety valve |
| CN105864496A (en) * | 2016-05-27 | 2016-08-17 | 永阀门集团有限公司 | Backpressure-adjusting pilot operated safety valve |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110645389A (en) * | 2019-01-15 | 2020-01-03 | 王欣 | Pilot operated safety valve |
| CN110230717A (en) * | 2019-07-12 | 2019-09-13 | 乐山市前沿油气设备制造有限公司 | Pilot operated safety valve |
| CN112360376A (en) * | 2020-12-10 | 2021-02-12 | 西南石油大学 | Blowout prevention check valve in spiral drill column |
| CN112360376B (en) * | 2020-12-10 | 2022-02-15 | 西南石油大学 | Blowout prevention check valve in spiral drill column |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181019 |
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| RJ01 | Rejection of invention patent application after publication |