CN106032844A - A plug valve - Google Patents
A plug valve Download PDFInfo
- Publication number
- CN106032844A CN106032844A CN201510108269.6A CN201510108269A CN106032844A CN 106032844 A CN106032844 A CN 106032844A CN 201510108269 A CN201510108269 A CN 201510108269A CN 106032844 A CN106032844 A CN 106032844A
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- CN
- China
- Prior art keywords
- valve
- valve body
- pilot sleeve
- shaped
- spool
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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
-
- 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
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/02—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having conical surfaces; Packings therefor
-
- 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
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/08—Details
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Multiple-Way Valves (AREA)
Abstract
The invention provides a plug valve comprising a valve body, a valve element, a valve rod and a guide sleeve. The valve body comprises a tapered valve cavity with a large upper portion and a small lower portion; the valve element can be arranged in the tapered valve cavity rotatably; the valve rod is arranged at the large-diameter end of the valve element; the guide sleeve is arranged at a first end of the valve body; the valve rod penetrates the guide sleeve and drives the valve element to move in the axial direction of the guide sleeve; the guide sleeve is connected with the valve rod via a first hinge pin; one of the guide sleeve and the valve rod is provided with a guide groove; the projection image of guide groove on a longitudinal middle plane of the guide sleeve is V-shaped or flat-bottom-V-shaped; the first hinge pin is arranged in the guide groove. According to the invention, the problems of complicated structure and higher cost of conventional plug valves are solved.
Description
Technical field
The present invention relates to switch valve technology field, especially relate to a kind of plug valve.
Background technology
In the prior art, plug valve is the compression of the lifting and spool that utilize driving means to realize spool, thus realizes switching the switching of valve and the sealing that resets.Driving means includes motor and drive mechanism, the commutation process of switching valve rely primarily on motor rotate through drive mechanism transmission, be converted realization.
In the Chinese invention patent application of Application No. 201410457649.6, disclosing a kind of rotary flow path switching valve, open driving structure, it is more complicated that the lifting of general plug valve rotates descending mechanism, relatively costly, processing inconvenience.
Summary of the invention
It is an object of the invention to provide a kind of plug valve, the problem complicated, relatively costly to solve stopcock structure of the prior art.
For solving above-mentioned technical problem, as one aspect of the present invention, it is provided that a kind of plug valve, including: valve body, valve body has up big and down small taper valve pocket；Spool, is rotatably arranged in cone valve intracavity；Valve rod, is arranged on the one end in the big footpath of spool；Pilot sleeve, is arranged on the first end of valve body, and valve rod is located in pilot sleeve and drives spool along the axially-movable of pilot sleeve；Being connected by the first bearing pin between pilot sleeve with valve rod, pilot sleeve and valve rod are provided with gathering sill on one of them, and gathering sill is projected as V-shaped or flat V-shaped on longitudinal midplane of pilot sleeve, and the first bearing pin is arranged in gathering sill.
Further, the angle between V-shaped or two hypotenuses of flat V-shaped is between 110 degree to 160 degree, it is therefore preferable to 135 degree.
Further, two hypotenuses of V-shaped or flat V-shaped are straight flange or arc-shaped side.
Further, gathering sill is arranged on pilot sleeve, and the first bearing pin is fixedly installed on valve rod, and the v-shaped openings of gathering sill is towards side, spool place.
Further, gathering sill is arranged on valve rod, and the first bearing pin is fixedly installed on pilot sleeve, and the v-shaped openings of gathering sill deviates from side, spool place.
Further, valve body includes that upper valve body, lower valve body, the combination of upper valve body, lower valve body form valve pocket；Upper valve body arranges the first mounting groove, and clamping sleeve is arranged in the first mounting groove, and pilot sleeve is fixedly installed on the first end end face of upper valve body, and between clamping sleeve and pilot sleeve, the axial direction along pilot sleeve is spaced setting.
Further, pilot sleeve is one-body molded with clamping sleeve.
Further, valve body includes that upper valve body, lower valve body, the combination of upper valve body, lower valve body form valve pocket；Pilot sleeve is one-body molded with upper valve body.
Further, valve body includes that upper valve body, lower valve body, the combination of upper valve body, lower valve body form valve pocket；Pilot sleeve is fixedly installed on the first end end face of described upper valve body.
The plug valve of the present invention, by pilot sleeve, valve rod is guided, thus control spool and rotate, at pilot sleeve and valve rod on one of them, it is connected by the first bearing pin between pilot sleeve with valve rod, pilot sleeve and valve rod are provided with gathering sill on one of them, and gathering sill is projected as V-shaped or flat V-shaped on longitudinal midplane of pilot sleeve.When valve rod rotates, owing to pilot sleeve is fixed on valve body, will not rotate, therefore valve rod rotates relative to pilot sleeve, in this process, first bearing pin can order about valve rod and decline afterwards along axially first rising of spool, during valve rod rises, gradually there is between spool and taper valve pocket gap, the now friction between spool and valve body tapers into, meanwhile, valve rod drives valve core rotation, complete the rotational action of spool, then valve rod declines, spool declines, and be pressed on the sidewall of valve body, the state making spool stay open or to close, thus complete the switching of plug valve state.The motion of the first bearing pin is guided by the application by arranging simple V-shaped or flat V-shaped gathering sill, the control to stem movement is can be realized as only by simple physical motion structure, realize the switching to plug valve duty, simple in construction, cost is relatively low, and easy to process, can effectively reduce difficulty of processing and the production cost of whole plug valve.
Accompanying drawing explanation
Fig. 1 diagrammatically illustrates the sectional structure chart of the plug valve according to the present invention；
Fig. 2 diagrammatically illustrates the amplification assumption diagram of the first embodiment at according to the Q of the plug valve of the present invention；
Fig. 3 diagrammatically illustrates the amplification assumption diagram of the second embodiment at according to the Q of the plug valve of the present invention；
Fig. 4 diagrammatically illustrates the amplification assumption diagram of the 3rd embodiment at according to the Q of the plug valve of the present invention；
Fig. 5 diagrammatically illustrates the front view of the first embodiment of the pilot sleeve of the plug valve of the present invention；
Fig. 6 diagrammatically illustrates the projection of the flat V-groove of the first embodiment of the pilot sleeve of the plug valve of the present invention；
Fig. 7 diagrammatically illustrates the front view of the second embodiment of the pilot sleeve of the plug valve of the present invention；
Fig. 8 diagrammatically illustrates the projection of the V-groove of the second embodiment of the pilot sleeve of the plug valve of the present invention；
Reference in figure: 10, valve body；20, spool；30, valve rod；40, pilot sleeve；50, clamping sleeve；60, motor is driven；70, motor cover；11, taper valve pocket；12, the first mounting groove；21, elastic mechanism；31, filler；32, o-ring；33, the second bearing pin；41, gathering sill；42, the first bearing pin；61, motor down-lead；
Detailed description of the invention
Hereinafter embodiments of the invention are described in detail, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
In figure, the direction of arrow represents the rotation direction of valve rod.
Refer to Fig. 1 to 8, according to embodiments of the invention, plug valve includes valve body 10, spool 20, valve rod 30 and pilot sleeve 40.Valve body 10 has up big and down small taper valve pocket 11；Spool 20 is rotatably arranged in taper valve pocket 11；Valve rod 30 is arranged on the one end in the big footpath of spool；Pilot sleeve 40 is arranged on the first end of valve body 10, in valve rod 30 is located in pilot sleeve 40 and drive spool 20 along the axially-movable of pilot sleeve 40；It is connected by the first bearing pin 42 between pilot sleeve 40 with valve rod 30, pilot sleeve 40 and valve rod 30 are provided with gathering sill 41 on one of them, gathering sill 41 is projected as V-shaped or flat V-shaped on longitudinal midplane of pilot sleeve 40, and the first bearing pin 42 is arranged in gathering sill 41.Spool can be the four-way of background technology, three-way switch valve core, it is also possible to is open and close type two-way valve core.
When valve rod 30 rotates, owing to pilot sleeve 40 is fixed on valve body 10, will not rotate, therefore valve rod 30 rotates relative to pilot sleeve 40, in this process, first bearing pin 42 can order about valve rod 30 and decline afterwards along axially first rising of spool 20, during valve rod 30 rises, gradually there is between spool 20 and taper valve pocket 11 gap, the now friction between spool 20 and valve body 10 tapers into, meanwhile, valve rod 30 band movable valve plug 20 rotates, complete the rotational action of spool 20, then valve rod 30 declines, spool 20 declines, and be pressed on the sidewall of valve body 10, make the state that spool 20 stays open or closes, thus complete the switching of plug valve state.The motion of the first bearing pin 42 is guided by the application by arranging simple V-shaped or flat V-shaped gathering sill, the control to valve rod 30 motion is can be realized as only by the design of simple structure, realize the switching to plug valve duty, simple in construction, cost is relatively low, and easy to process, can effectively reduce difficulty of processing and the production cost of whole plug valve.
In conjunction with shown in Figure 2, first embodiment for the plug valve of the present invention, in the present embodiment, taper valve pocket 11 is up big and down small taper valve pocket, gathering sill 41 is arranged on pilot sleeve 40, first bearing pin 42 is fixedly installed on valve rod 30, and the v-shaped openings of gathering sill 41 is just to side, spool 20 place.
Owing to pilot sleeve 40 is fixedly installed on valve body 10, rotate thus without relative to valve body 10, now when drive mechanism drives valve rod 30 to rotate, valve rod 30 drives the first bearing pin 42 being disposed thereon together to rotate, owing to the motion of the first bearing pin 42 is limited by gathering sill 41, therefore first can move to spool 20 under the side hypotenuse effect of gathering sill 41, thus band ovable valve stem 30 pulls up spool 20, make spool 20 move upward.During valve rod 30 rises, disengaging between the sidewall of spool 20 and taper valve pocket 11, the frictional force between the sidewall of spool 20 and taper valve pocket 11 is greatly reduced, it is only necessary to the least power just can make spool 20 together rotate with valve rod 30.
After spool 20 turns to certain angle, valve rod 30 declines near the direction of spool 20 under the induced effect of the first bearing pin 42, spool 20 is gradually close to the sidewall of taper valve pocket 11, when valve rod 30 moves to the terminal position of opposite side hypotenuse of gathering sill 41, the state of spool 20 is fully finished switching, now spool 20 is pressed on the sidewall of taper valve pocket 11, and is maintained at current duty.
When plug valve is switched to former duty by needs, it is only necessary to above-mentioned operating procedure be reversed, the first bearing pin 42 band ovable valve stem 30 is made to rotate backward.Above-mentioned stopcock structure is simple, easy to operate, it is possible to quickly realize the state switching of plug valve.
In conjunction with seeing shown in Fig. 5 to Fig. 8, the angle between V-shaped or two hypotenuses of flat V-shaped is between 110 degree to 160 degree, it is therefore preferable to 135 degree.Generally, the angle angle between V-shaped or two hypotenuses of flat V-shaped is the biggest, the first bearing pin 42 to move axially the slowest, required power the least.But, some workplaces need to press down, and in order to press down, this angle is the most the smaller the better.If additionally, use nonmetal sealing, then in order to reduce the abrasion of sealing member, it is desirable to press down.Therefore, the angle angle between V-shaped gathering sill and horizontal plane can be combination, and it is little just to have started angle angle, presses down；Behind V-shaped gathering sill middle part, angle is larger, can press down.Namely, the hypotenuse of the groove of V-shaped is not a straight flange, but the combination of a plurality of hypotenuse that angle of inclination changes, or an arc-shaped side, this arc-shaped side is gradually reduced to the angle the direction of bottom and between horizontal plane from the top of V-shaped gathering sill, the rate of climb making valve rod 30 is gradually tended to slow by urgency, thus meets and use requirement.
In conjunction with seeing shown in Fig. 5 and Fig. 6, first embodiment for pilot sleeve 40, in this embodiment, V-shaped gathering sill is top flat shape, including the hypotenuse on both sides and be connected between two hypotenuses flat section, when the first bearing pin 42 moves in gathering sill 41, first the effect of increasing power at the hypotenuse of the wherein side of gathering sill 41 rotates up and moves upward, when moving to flat section, first bearing pin 42 rotation does not rises, accordingly, valve rod 30 is also only to rotate not rise at flat section, now completely disengage from contacting of the inwall with taper valve pocket 11 due to spool 20, having only to the least power just can make spool 20 rotate, thus carry out the state switching of spool 20.After the first bearing pin 42 rotated flat section, enter at opposite side hypotenuse, in this place under the effect of hypotenuse, first bearing pin 42 band ovable valve stem 30 rotating down pressing, spool is pressed for 20 times, under the drive of valve rod 30, spool 20 rotates simultaneously, finally makes spool 20 completion status switch.The active force that flat section herein can make spool 20 carry out when state switches is the least, therefore can reduce the power consumption of drive mechanism, saves the energy, it is possible to reduce cost.
In conjunction with seeing shown in Fig. 7 and Fig. 8, the second embodiment for pilot sleeve 40, in this embodiment, the v-shaped openings of gathering sill 41 includes two interconnective hypotenuses, for the first embodiment of pilot sleeve 40, distinguish the v-shaped openings of the gathering sill 41 being in the present embodiment and be not provided with flat section.This kind of structure is advantageous in that, being switched fast of duty of spool 20 can be realized, switching efficiency can be improved, and reduce the abrasion of non-metallic seal, but meanwhile, when carrying out the state switching of spool 20 in the present embodiment, required activation force can be more than the activation force of the plug valve that gathering sill 41 is flat V-shaped.For selecting which kind of structure, the environment can being suitable for according to plug valve by staff is determined.
All sides of valve rod 30 are provided with filler 31, and plug valve also includes the clamping sleeve 50 being pressed on filler 31.Link position between valve rod 30 and valve body 10 can be sealed by filler 31, thus improves the overall sealing performance of plug valve.
In the present embodiment, as in figure 2 it is shown, pilot sleeve 40 and clamping sleeve 50 are formed in one, while the set 50 that is fixed and clamped, it is also possible to fixed guide sleeve 40, simple in construction, easy to process, cost is relatively low.
Plug valve also includes driving motor 60 and being located at the motor cover 70 driven outside motor 60, and motor cover 70 seals with valve body 10 circumference soldering.Due to motor cover 70 and valve body 10 welded seal, therefore the leakage between valve rod 30 and valve body 10 does not interferes with the work of plug valve.
Preferably, sealed by o-ring 32 between valve rod 30 and valve body 10, drive sealant pouring and sealing between motor down-lead 61 and the motor cover 70 of motor 60, the integral sealing effect of plug valve can be improved further.
In conjunction with shown in Figure 3, according to the second embodiment of the present invention, valve body 10 includes the first mounting groove 12, clamping sleeve 50 is arranged in the first mounting groove 12, pilot sleeve 40 is fixedly installed on the first end end face of valve body 10, and between clamping sleeve 50 and pilot sleeve 40, the axial direction along pilot sleeve 40 is spaced setting.
Due to when pilot sleeve 40 and clamping sleeve 50 are one-body molded, likely the filling of filler 31 can cause clamping sleeve 50 to be installed at the end, the height dimension making the gathering sill 41 of pilot sleeve 40 is uncertain, and then cause the lifting size of spool 20 uncertain, affect the control accuracy of plug valve, therefore clamping sleeve 50 and pilot sleeve 40 are provided separately by the present embodiment, pilot sleeve 40 is integrated with valve body 10, clamping sleeve 50 is made to be provided separately within the first mounting groove 12, the mounting structure of pilot sleeve 40 will not be impacted, thus can ensure that the height dimension of the gathering sill 41 of pilot sleeve 40 determines, such that it is able to determine the lifting size of spool 20 more easily.
In conjunction with shown in Figure 4, according to the third embodiment of the invention, it is essentially identical with the second embodiment, difference is, in the present embodiment, and it is not provided with filler 31, but o-ring 32 is set between valve body 10 and valve rod 30 and seals, this kind of structure can be effectively ensured the installation site of clamping sleeve 50, and ensure the sealing property between valve body 10 and valve rod 30 simultaneously.
These are only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (10)
1.
A kind of plug valve, including:
Valve body (10), described valve body (10) has up big and down small taper valve pocket (11)；
Spool (20), is rotatably arranged in described taper valve pocket (11)；
Valve rod (30), is arranged on the one end in the big footpath of described spool (20)；
It is characterized in that, described plug valve also includes:
Pilot sleeve (40), is arranged on the first end of described valve body (10), and described valve rod (30) is located in described pilot sleeve (40) and drives described spool (20) along the axially-movable of described pilot sleeve (40)；It is connected by the first bearing pin (42) between described pilot sleeve (40) with described valve rod (30), described pilot sleeve (40) and described valve rod (30) are provided with gathering sill (41) on one of them, described gathering sill (41) is projected as V-shaped or flat V-shaped on longitudinal midplane of described pilot sleeve (40), and described first bearing pin (42) is arranged in described gathering sill (41).
2.
Plug valve according to claim 1, it is characterised in that the angle between described V-shaped or two hypotenuses of flat V-shaped is between 110 degree to 160 degree.
Plug valve the most according to claim 2, it is characterised in that the angle between described V-shaped or two hypotenuses of flat V-shaped is 135 degree.
4.
Plug valve according to claim 1, it is characterised in that two hypotenuses of described V-shaped or flat V-shaped are straight flange or arc-shaped side.
5.
Plug valve according to claim 1, it is characterized in that, described gathering sill (41) is arranged on described pilot sleeve (40), and described first bearing pin (42) is fixedly installed on described valve rod (30), and the v-shaped openings of described gathering sill (41) is towards described spool (20) side, place.
6.
Plug valve according to claim 1, it is characterized in that, described gathering sill (41) is arranged on described valve rod (30), and described first bearing pin (42) is fixedly installed on described pilot sleeve (40), and the v-shaped openings of described gathering sill (41) deviates from described spool (20) side, place.
7.
Plug valve according to claim 1, it is characterised in that described valve body (10) includes that upper valve body (11), lower valve body (12), the combination of upper valve body, lower valve body form valve pocket；Upper valve body arranges the first mounting groove (12), described clamping sleeve (50) is arranged in described first mounting groove (12), described pilot sleeve (40) is fixedly installed on the first end end face of described upper valve body (11), and between described clamping sleeve (50) and described pilot sleeve (40), the axial direction along described pilot sleeve (40) is spaced setting.
8.
Plug valve according to claim 7, it is characterised in that described pilot sleeve (40) is one-body molded with described clamping sleeve (50).
9.
Plug valve according to claim 1, it is characterised in that described valve body (10) includes that upper valve body (11), lower valve body (12), the combination of upper valve body, lower valve body form valve pocket；Described pilot sleeve (40) is one-body molded with described upper valve body (11).
Plug valve the most according to claim 1, it is characterised in that described valve body (10) includes that upper valve body (11), lower valve body (12), the combination of upper valve body, lower valve body form valve pocket；Described pilot sleeve (40) is fixedly installed on the first end end face of described upper valve body (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510108269.6A CN106032844A (en) | 2015-03-12 | 2015-03-12 | A plug valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510108269.6A CN106032844A (en) | 2015-03-12 | 2015-03-12 | A plug valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106032844A true CN106032844A (en) | 2016-10-19 |
Family
ID=57150009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510108269.6A Pending CN106032844A (en) | 2015-03-12 | 2015-03-12 | A plug valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106032844A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107041563A (en) * | 2017-05-11 | 2017-08-15 | 江苏牧羊控股有限公司 | One kind does not rotatably shut down mold changing bulking machine and application method |
| CN110107708A (en) * | 2019-05-27 | 2019-08-09 | 欧冠阀门科技有限公司 | Upper dress formula double-valve-seat taper ball valve |
| CN110762254A (en) * | 2019-11-12 | 2020-02-07 | 北京大漠石油工程技术有限公司 | Liquid level control four-way regulating valve |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2988319A (en) * | 1960-06-15 | 1961-06-13 | Robert L Erwin | Rotary plug valves |
| US4073468A (en) * | 1976-09-16 | 1978-02-14 | Erwin Robert L | Rotary plug valve |
| US4442996A (en) * | 1982-03-08 | 1984-04-17 | Josiephine R. Erwin | Tapered rotary plug valve |
| CN201078483Y (en) * | 2007-08-08 | 2008-06-25 | 安徽铜都阀门有限公司 | Hoisting type single pair tight seal cock valve |
| CN201318464Y (en) * | 2008-12-16 | 2009-09-30 | 成都乘风阀门有限责任公司 | Rail type plug valve |
-
2015
- 2015-03-12 CN CN201510108269.6A patent/CN106032844A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2988319A (en) * | 1960-06-15 | 1961-06-13 | Robert L Erwin | Rotary plug valves |
| US4073468A (en) * | 1976-09-16 | 1978-02-14 | Erwin Robert L | Rotary plug valve |
| US4442996A (en) * | 1982-03-08 | 1984-04-17 | Josiephine R. Erwin | Tapered rotary plug valve |
| CN201078483Y (en) * | 2007-08-08 | 2008-06-25 | 安徽铜都阀门有限公司 | Hoisting type single pair tight seal cock valve |
| CN201318464Y (en) * | 2008-12-16 | 2009-09-30 | 成都乘风阀门有限责任公司 | Rail type plug valve |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107041563A (en) * | 2017-05-11 | 2017-08-15 | 江苏牧羊控股有限公司 | One kind does not rotatably shut down mold changing bulking machine and application method |
| CN110107708A (en) * | 2019-05-27 | 2019-08-09 | 欧冠阀门科技有限公司 | Upper dress formula double-valve-seat taper ball valve |
| CN110107708B (en) * | 2019-05-27 | 2024-05-28 | 欧冠阀门科技有限公司 | Top-mounted double-valve seat conical ball valve |
| CN110762254A (en) * | 2019-11-12 | 2020-02-07 | 北京大漠石油工程技术有限公司 | Liquid level control four-way regulating valve |
| CN110762254B (en) * | 2019-11-12 | 2021-07-20 | 北京大漠石油工程技术有限公司 | Liquid level control four-way regulating valve |
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Application publication date: 20161019 |