CN108758042A - Self-operated type casing gas determines valve - Google Patents
Self-operated type casing gas determines valve Download PDFInfo
- Publication number
- CN108758042A CN108758042A CN201810764682.1A CN201810764682A CN108758042A CN 108758042 A CN108758042 A CN 108758042A CN 201810764682 A CN201810764682 A CN 201810764682A CN 108758042 A CN108758042 A CN 108758042A
- Authority
- CN
- China
- Prior art keywords
- valve
- spool
- adjusting screw
- swing rod
- self
- 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
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
- F16K17/12—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side weight-loaded
-
- 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)
- Lift Valve (AREA)
Abstract
The invention discloses a kind of self-operated type casing gas to determine valve, including valve rod, spool, valve body and valve deck, and the valve rod is connect by fixed pin with spool；Sleeve is arranged with outside the spool, the sleeve and spool are located above valve seat, and the valve body is set in the outside for the spool for assembling valve seat and sleeve；The valve deck is sheathed on stem exterior, and above valve body；Swing rod is equipped at the top of the valve deck, the swing rod is fixed on the side of valve deck by axis pin, and the swing rod can be rotated along axis pin, and the swing rod is equipped with pressure regulating mechanism.Self-operated type casing gas provided by the invention determines valve using distributed cylinder weight load mode, by the medium flowed through in valve the pressure of itself as driven by energy valve automatic work；Fluid pressure reaches setting value automatic exhaust for a long time；Distributed cylindrical structure is realized through Fluid pressure size come control valve opening degree, to realize full open until clearing；It is simple in structure, easy to maintain.
Description
Technical field
The present invention relates to a kind of valves more particularly to a kind of self-operated type casing gas to determine valve.
Background technology
In oilfield development process, though when stratum energy gradually decreases to be not enough to maintain blowing or energy blowing yield mistake
It is low, or it is unable to blowing at the very start, it is necessary to artificial supplementation energy recovers the oil, i.e. mechanical oil recovery.
During associated gas is oil field machinery oil, the gas occurred with petroleum liquid between oil reservoir, mainly at
It is methane to divide, and usually contains a large amount of ethane and other hydrocarbon components.Associated gas recovery processing refers to just by ethane, propane, fourth
Alkane and other hydrocarbon components are separated from air-flow, they can be further processed, and are mixed as pure component or natural gas
Liquid (NGL) or LPG sale, associated gas belong to available energy.
Associated gas, that is, casing gas is divided to two approach, and one kind is exactly and crude oil comes out away the pipeline that enters the station, another way together
Be in casing out pure gas, the heating furnace that enters the station on the spot if narrow-minded burn-up, it is large-minded recycle pass through into production station it is special
The natural gas recovery line recycling of door.Now due to the requirement of environmental protection, cannot discharge, can only recycle.
The associated gas of medium and small tolerance is generally directly accessed oil pipe.But it is directly accessed oil pipe, it may occur that crude oil is flow backwards.In order to
It prevents from flowing backwards, generally can all be equipped with check-valves, since the generation of associated gas is successional, one has pressure check valve that will beat
It opens, check-valves is in the very frequent state opened, be vented closing again.Although check valve structure is simple, service life and reliable
Property is difficult to ensure.Therefore, it is necessary to a kind of automatic exhaust control valves setting pressure at expulsion.
Invention content
The technical problem to be solved in the present invention is to provide a kind of self-operated type casing gas to determine valve, solves current valve without legal
Press self-bleeding problem.
The present invention to solve above-mentioned technical problem and the technical solution adopted is that providing a kind of self-operated type casing gas determines valve,
Including valve rod, spool, valve body and valve deck, the valve rod is connect by fixed pin with spool；It is arranged with sleeve outside the spool, institute
It states sleeve and spool is located above valve seat, the valve body is set in the outside for the spool for assembling valve seat and sleeve；The valve deck
It is sheathed on stem exterior, and above valve body；Swing rod is equipped at the top of the valve deck, the swing rod is fixed on valve deck by axis pin
Side, the swing rod can rotate along axis pin, and the swing rod is equipped with pressure regulating mechanism.
Further, the valve deck is connected and fixed with valve body by middle flange bolt, and the valve deck is equipped with valve body junction
Middle flange gasket.
Further, it is filled with filler in the valve rod and valve deck gap, is equipped with pressing sleeve above the filler, the pressing sleeve is arranged
Outside valve rod, the pressing sleeve is T-shaped, and the pressing sleeve bottom is inserted into the gap of valve rod and valve deck, and filler is compressed；The pressure
Set is equipped with groove with valve deck contact surface, and O-ring is equipped in the groove.
Further, the body base is equipped with entrance, and the valve body side is equipped with outlet；The valve body inlet connects with valve seat
It is logical；The valve body is equipped with valve seat gasket with valve seat junction.
Further, the position of the swing rod and valve stem contacts is equipped with protrusion, and the swing rod is provided with card in the longitudinal direction
Slot, the pressure regulating mechanism are arranged in card slot, and the pressure regulating mechanism includes closing adjusting screw, opening adjusting screw
With several cylinder weights, described one end closed adjusting screw and be positioned close to axis pin, the closing adjusting screw position can
It adjusts；Described one end opened adjusting screw and be arranged far from axis pin, it is described to open adjusting screw position-adjustable；The cylinder weight
Hammer, which is located at, closes between adjusting screw and unlatching adjusting screw, and the cylinder weight can freely be rolled along card slot.
Further, it is described close adjusting screw be used for be arranged valve closing pressure, valve close pressure size with
The distance for closing adjusting screw and axis pin is directly proportional；When valve is in open state, the free end of the swing rod is higher than fixing end,
The cylinder weight is close to the position for closing adjusting screw, when Fluid pressure is less than the closing pressure of setting, the swing rod
Free end moves down under the effect of gravity, and band ovable valve stem moves down, and valve is closed.
Further, the adjusting screw of opening is used to be arranged the pressure of valve opening, the size of the pressure of valve opening with
The distance for opening adjusting screw and axis pin is directly proportional；When valve is closed, the free end of the swing rod is less than fixing end,
The cylinder weight is close to the position for opening adjusting screw, when Fluid pressure is more than the Opening pressure of setting, the spool
It is moved up under Fluid pressure effect, band ovable valve stem moves up, and pushes swing rod free end to move up, valve opening.
Further, the spool bottom margin is equipped with annular recoil slot, and spool bottom centre height is high less than edge
Degree, the valve seat bore is up-small and down-big, and the valve seat internal upper part is equipped with valve seat mouth, the recoil slot internal diameter and valve seat mouth diameter
Match, the spool bottom centre is caught in valve seat mouth.
The present invention, which compares the prior art, following advantageous effect：Self-operated type casing gas provided by the invention determines valve, adopts
With distributed cylinder weight load mode, start building certainly as driven by energy valve by the medium flowed through in valve the pressure of itself
Make, does not need the control valve of external power supply and secondary meter；Opening pressure can be set and close pressure, Fluid pressure, which is more than, opens
Valve opening valve when Fluid pressure is less than and closes pressure is closed when pressure, realizes that Fluid pressure reaches setting value for a long time
Self-bleeding purpose；Distributed cylindrical structure slidably reciprocates on swing rod 14, realizes through Fluid pressure size come control valve
Door opening degree, to realize full open until clearing；It is simple in structure, easy to maintain.
Description of the drawings
Fig. 1 is that self-operated type casing gas determines valve structural schematic diagram in the embodiment of the present invention；
Fig. 2 is that self-operated type casing gas determines valve closed mode schematic diagram in the embodiment of the present invention；
Fig. 3 is that self-operated type casing gas determines valve open state schematic diagram in the embodiment of the present invention；
Fig. 4 is that self-operated type casing gas determines valve spool part-structure schematic diagram in the embodiment of the present invention；
In figure：
| 1 valve body | 2 valve seat gaskets | 3 valve seats |
| 4 sleeves | 5 spools | 6 fixed pins |
| 7 valve rods | Flange gasket in 8 | 9 valve decks |
| Flange bolt in 10 | 11 fillers | 12 pressing sleeves |
| 13 axis pins | 14 swing rods | 15 close adjusting screw |
| 16 cylinder weights | 17 open adjusting screw | 18 card slots |
| 19 valve seat mouths | 21 recoil slots |
Specific implementation mode
The invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is that self-operated type casing gas determines valve structural schematic diagram in the embodiment of the present invention.
Fig. 1 is referred to, self-operated type casing gas provided by the invention determines valve, including valve rod 7, spool 5, valve body 1 and valve deck
9, the valve rod 7 is connect by fixed pin 6 with spool 5；It is arranged with sleeve 4 outside the spool 5, the sleeve 4 and spool 5 are located at
3 top of valve seat, the valve body 1 are set in the outside for the spool 19 for assembling valve seat 3 and sleeve 4；The valve deck 9 is sheathed on valve rod
Outside 15, and positioned at 1 top of valve body；9 top of the valve deck is equipped with swing rod 14, and the swing rod 14 is fixed on valve deck by axis pin 13
9 side, the swing rod 14 can be rotated along axis pin 13, and the swing rod 14 is equipped with pressure regulating mechanism.The valve deck 9 and valve body
1 is connected and fixed by middle flange bolt 10, and the valve deck 9 is equipped with middle flange gasket 6 with 1 junction of valve body, improves leakproofness
Energy.1 bottom of the valve body is equipped with entrance, and 1 side of the valve body is equipped with outlet；1 entrance of the valve body is connected to valve seat 3；It is described
Valve body 1 is equipped with valve seat gasket 2 with 3 junction of valve seat.
Self-operated type casing gas provided by the invention determines valve, and filler 11, the filler are filled in valve rod 7 and 9 gap of valve deck
11 tops are equipped with pressing sleeve 12, and the pressing sleeve 12 is set in outside valve rod 7, and the pressing sleeve 12 is T-shaped, and valve is inserted into 12 bottom of the pressing sleeve
In the gap of bar 7 and valve deck 9, and filler 11 is compressed；The pressing sleeve 12 and 9 contact surface of valve deck are equipped with groove, in the groove
The safety that sealing performance increases valve is improved by O-ring and packing seal equipped with O-ring.
Self-operated type casing gas provided by the invention determines valve, and the position that swing rod 14 is contacted with valve rod 7 is equipped with protrusion so that pendulum
Bar 14 is remained vertically oriented with 7 interaction force of valve rod, will not generate horizontal direction to valve rod 7 with 14 angle change of swing rod
Power.Swing rod 14 is provided with card slot 18 in the longitudinal direction, and the pressure regulating mechanism is arranged in card slot 18, the pressure tune
It includes closing adjusting screw 15, opening adjusting screw 17 and several cylinder weights 16, the closing adjusting screw 15 to save mechanism
It is positioned close to one end of axis pin 13,15 position-adjustable of closing adjusting screw；The setting of unlatching adjusting screw 17 exists
One end far from axis pin 13, it is described to open 17 position-adjustable of adjusting screw；The cylinder weight 16, which is located at, closes adjusting screw 15
And between opening adjusting screw 17, the cylinder weight 16 can freely be rolled along card slot 18.
Self-operated type casing gas provided by the invention determines valve, opens the pressure that adjusting screw 17 is used to be arranged valve opening,
The size of the pressure of valve opening is directly proportional at a distance from unlatching adjusting screw 17 and axis pin 13.Adjusting screw 15 is closed for setting
The pressure of valve closing is set, the size for the pressure that valve is closed is directly proportional at a distance from closing adjusting screw 15 and axis pin 13.If
It sets Opening pressure and closes pressure, valve opening closes pressure until Fluid pressure is less than when Fluid pressure is more than Opening pressure
When valve close
Fig. 2 is referred to, when valve is closed, the free end of the swing rod 14 is less than fixing end, the cylinder weight 16
Close to the position for opening adjusting screw 17；When Fluid pressure is more than the Opening pressure of setting, the spool 5 is in Fluid pressure
It is moved up under effect, band ovable valve stem 7 moves up, and pushes 14 free end of swing rod to move up, valve opening, valve only needs to maintain lower pressure
Power is more than closing pressure and is held at open state.
Fig. 3 is referred to, when valve is in open state, the free end of the swing rod 14 is higher than fixing end, the cylinder weight
Hammer 16 is close to the position for closing adjusting screw 15；When Fluid pressure is less than the closing pressure of setting, the swing rod 14 is freely
End moves down under the effect of gravity, and band ovable valve stem 7 moves down, and valve is closed.
Fig. 4 is referred to, 5 bottom margin of spool is equipped with annular recoil slot 21, and 5 bottom centre's height of the spool is less than edge
Highly, valve seat 3 uses throat structure, and 3 internal diameter of valve seat is up-small and down-big, and 3 internal upper part of the valve seat is equipped with valve seat mouth 19, valve seat mouth 19
Diameter is less than 1 inlet diameter of valve body, while 4 diameter of sleeve is more than 19 diameter of valve seat mouth, and recoil 21 internal diameter of slot is straight with valve seat mouth 19
Diameter matches, and 5 bottom centre of the spool is caught in valve seat mouth 19.Area in sleeve 4 is greater than 19 area of valve seat mouth, when valve seat 3
The pressure accumulated of lower section is more than Opening pressure, and spool 5 moves up, and forced area is caused to increase, and also moment increases upward thrust, makes
Spool 5 makees upward accelerated motion.After spool 5 is increased beyond window, medium forms flow.21 knot of recoil slot of spool 5
Structure continues to rise by the kinetic energy of medium, to effectively realize big aperture, is conducive to discharge.Meanwhile swing rod 14 rises, distribution
7 dynamic loading of valve rod may be implemented in the rolling of formula cylinder weight 16.
In conclusion self-operated type casing gas provided by the invention determines valve, using distributed cylinder weight load mode, according to
By flowing through the pressure of the medium in valve itself as driven by energy valve automatic work, external power supply and secondary meter are not needed
Control valve；Can set Opening pressure and close pressure, Fluid pressure be more than Opening pressure when valve opening until Fluid pressure it is small
Valve is closed when closing pressure, realizes that Fluid pressure reaches setting value self-bleeding purpose for a long time；Distributed cylinder knot
Structure slidably reciprocates on swing rod 14, realizes through Fluid pressure size come control valve opening degree, to realize that full open is straight
To clearing；It is simple in structure, easy to maintain.
Although the present invention is disclosed as above with preferred embodiment, however, it is not to limit the invention, any this field skill
Art personnel, without departing from the spirit and scope of the present invention, when can make a little modification and it is perfect, therefore the present invention protection model
It encloses to work as and is subject to what claims were defined.
Claims (8)
1. a kind of self-operated type casing gas determines valve, which is characterized in that including valve rod（7）, spool（5）, valve body（1）And valve deck（9）,
The valve rod（7）Pass through fixed pin（6）With spool（5）Connection；The spool（5）It is arranged with sleeve outside（4）, the sleeve（4）
And spool（5）Positioned at valve seat（3）Top, the valve body（1）It is set in and assembles valve seat（3）And sleeve（4）Spool（19）'s
It is external；The valve deck（9）It is sheathed on valve rod（15）Outside, and it is located at valve body（1）Top；The valve deck（9）Top is equipped with swing rod
（14）, the swing rod（14）Pass through axis pin（13）It is fixed on valve deck（9）Side, the swing rod（14）It can be along axis pin（13）Turn
It is dynamic, the swing rod（14）It is equipped with pressure regulating mechanism.
2. self-operated type casing gas as described in claim 1 determines valve, which is characterized in that the valve deck（9）With valve body（1）Pass through
Middle flange bolt（10）It is connected and fixed, the valve deck（9）With valve body（1）Junction is equipped with middle flange gasket（6）.
3. self-operated type casing gas as described in claim 1 determines valve, which is characterized in that the valve rod（7）With valve deck（9）Gap
In be filled with filler（11）, the filler（11）Top is equipped with pressing sleeve（12）, the pressing sleeve（12）It is set in valve rod（7）Outside, described
Pressing sleeve（12）It is T-shaped, the pressing sleeve（12）Valve rod is inserted into bottom（7）With valve deck（9）Gap in, and by filler（11）It compresses；
The pressing sleeve（12）With valve deck（9）Contact surface is equipped with groove, and O-ring is equipped in the groove.
4. self-operated type casing gas as described in claim 1 determines valve, which is characterized in that the valve body（1）Bottom is equipped with entrance,
The valve body（1）Side is equipped with outlet；The valve body（1）Entrance and valve seat（3）Connection；The valve body（1）With valve seat（3）Connection
Place is equipped with valve seat gasket（2）.
5. self-operated type casing gas as described in claim 1 determines valve, which is characterized in that the swing rod（14）With valve rod（7）It connects
Tactile position is equipped with protrusion, the swing rod（14）It is provided with card slot in the longitudinal direction（18）, the pressure regulating mechanism setting
In card slot（18）In, the pressure regulating mechanism includes closing adjusting screw（15）, open adjusting screw（17）With several circles
Column weight（16）, the closing adjusting screw（15）It is positioned close to axis pin（13）One end, the closing adjusting screw（15）
Position-adjustable；The unlatching adjusting screw（17）It is arranged far from axis pin（13）One end, it is described to open adjusting screw（17）Position
It sets adjustable；The cylinder weight（16）Positioned at closing adjusting screw（15）With unlatching adjusting screw（17）Between, the cylinder
Weight（16）It can be along card slot（18）Freely roll.
6. self-operated type casing gas as claimed in claim 5 determines valve, which is characterized in that the closing adjusting screw（15）For
The pressure of valve closing, size and the closing adjusting screw of the pressure that valve is closed are set（15）And axis pin（13）Distance at just
Than；When valve is in open state, the swing rod（14）Free end be higher than fixing end, the cylinder weight（16）Close to pass
Close adjusting screw（15）Position, when Fluid pressure be less than setting closing pressure when, the swing rod（14）Free end is in gravity
It is moved down under effect, band ovable valve stem（7）It moves down, valve is closed.
7. self-operated type casing gas as claimed in claim 5 determines valve, which is characterized in that the unlatching adjusting screw（17）For
The pressure of valve opening, size and the unlatching adjusting screw of the pressure of valve opening are set（17）And axis pin（13）Distance at just
Than；When valve is closed, the swing rod（14）Free end be less than fixing end, the cylinder weight（16）It is opened close
Open adjusting screw（17）Position, when Fluid pressure be more than setting Opening pressure when, the spool（5）It is acted in Fluid pressure
Under move up, band ovable valve stem（7）It moves up, pushes swing rod（14）Free end moves up, valve opening.
8. self-operated type casing gas as described in claim 1 determines valve, which is characterized in that the spool（5）Bottom margin is equipped with
Annular recoil slot（21）, the spool（5）Bottom centre's height is less than brim height, the valve seat（3）Internal diameter is up-small and down-big, institute
State valve seat（3）Internal upper part is equipped with valve seat mouth（19）, the recoil slot（21）Internal diameter and valve seat mouth（19）Diameter matches, the spool
（5）Bottom centre is caught in valve seat mouth（19）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810764682.1A CN108758042A (en) | 2018-07-12 | 2018-07-12 | Self-operated type casing gas determines valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810764682.1A CN108758042A (en) | 2018-07-12 | 2018-07-12 | Self-operated type casing gas determines valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108758042A true CN108758042A (en) | 2018-11-06 |
Family
ID=63973409
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810764682.1A Pending CN108758042A (en) | 2018-07-12 | 2018-07-12 | Self-operated type casing gas determines valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108758042A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US306568A (en) * | 1884-10-14 | wildee | ||
| US1483250A (en) * | 1922-12-04 | 1924-02-12 | Robert E Sturman | Valve |
| US1498024A (en) * | 1923-05-11 | 1924-06-17 | Joseph C Fant | Valve |
| CN106523751A (en) * | 2016-12-29 | 2017-03-22 | 哈尔滨金源伟业环保科技有限公司 | Explosion-proof device of oil field oily sludge treatment equipment |
| CN206738579U (en) * | 2016-10-21 | 2017-12-12 | 重庆世壮仪器仪表有限公司 | Low leakage low noise balance cage control valve |
-
2018
- 2018-07-12 CN CN201810764682.1A patent/CN108758042A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US306568A (en) * | 1884-10-14 | wildee | ||
| US1483250A (en) * | 1922-12-04 | 1924-02-12 | Robert E Sturman | Valve |
| US1498024A (en) * | 1923-05-11 | 1924-06-17 | Joseph C Fant | Valve |
| CN206738579U (en) * | 2016-10-21 | 2017-12-12 | 重庆世壮仪器仪表有限公司 | Low leakage low noise balance cage control valve |
| CN106523751A (en) * | 2016-12-29 | 2017-03-22 | 哈尔滨金源伟业环保科技有限公司 | Explosion-proof device of oil field oily sludge treatment equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109469735B (en) | Valve seat structure of double-valve-port three-seal valve core | |
| CN101504088A (en) | Multifunctional general balance valve | |
| CN110671502A (en) | Water hammer resistant stop valve | |
| CN106285561B (en) | Downhole safety valve system | |
| CN104455604A (en) | High-pressure modulated type pilot operated safety valve | |
| CN102588960A (en) | Fluidization blast cap used for preventing slag leakage | |
| CN206347163U (en) | Spring loaded safety valve | |
| CN106285580B (en) | A kind of underground throttle device | |
| CN208457282U (en) | Self-operated type casing gas determines valve | |
| CN108758042A (en) | Self-operated type casing gas determines valve | |
| CN105673903B (en) | A kind of self-balancing valve | |
| CN208950565U (en) | A kind of big channel steam injection ball-and-seat of erosion resistance | |
| CN204200720U (en) | A kind of capsule-type accumulator | |
| CN208442345U (en) | A kind of good oil return valve of closure | |
| CN104727778B (en) | Remote high-pressure well opening emergency cut-off device | |
| CN103968113B (en) | Low-pressure large-diameter safety valve | |
| CN212867501U (en) | Multifunctional combined fracturing gas production wellhead device | |
| CN201810840U (en) | Low-pressure regulating valve of small flow gas | |
| CN211116671U (en) | Novel micro-resistance slow-closing check valve | |
| CN201396114Y (en) | Plug valve special for under-balanced drilling | |
| CN204300446U (en) | A kind of high-voltage modulation type Pilot operated safety valve | |
| CN108413099A (en) | It is switched off or on the partition check-valves of oil supply system oil circuit medium back flow | |
| CN204532250U (en) | Remote high-voltage drives a well emergency shutoff device | |
| CN208474591U (en) | A kind of gas regulator pressure regulation locking device | |
| CN202065165U (en) | Safe venting device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20181106 |