CN112344036B - Throttle valve and valve core thereof - Google Patents
Throttle valve and valve core thereof Download PDFInfo
- Publication number
- CN112344036B CN112344036B CN201910725577.1A CN201910725577A CN112344036B CN 112344036 B CN112344036 B CN 112344036B CN 201910725577 A CN201910725577 A CN 201910725577A CN 112344036 B CN112344036 B CN 112344036B
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- valve
- valve core
- hole
- conical
- core
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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
- 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
- F16K1/36—Valve members
- F16K1/38—Valve members of conical shape
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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
- F16K1/48—Attaching valve members to screw-spindles
Abstract
The invention discloses a valve core, which is provided with a through hole with a larger diameter penetrating through two end faces, wherein the side wall of the first end of the valve core is provided with a side hole communicated with the through hole, and a fluid flow channel is constructed for chambers at two ends of the valve core, so that fluid is in a circulation state in the chambers at two ends of the valve core, so that the chambers at two ends of the valve core keep pressure balance, and the blockage of the through hole of the valve core and the chamber near the end of the valve rod is avoided, thereby ensuring the opening adjustment of a throttle valve and effectively ensuring the use reliability of the throttle valve. The invention also discloses a throttle valve using the valve core.
Description
Technical Field
The invention relates to the technical field of well control equipment, in particular to a throttling valve and a valve core thereof.
Background
In the process of petroleum and natural gas drilling, when dangerous situations such as overflow, well kick and the like occur and the well is closed, the well needs to be circularly pressed through a throttling well pressing manifold to process the dangerous situations. The working principle of the throttle manifold is that the throttle valve is used for changing the flow area of the circulating channel, and further controlling the flow of the passing fluid, so that the front pressure of the throttle valve is controlled, and the purposes of indirectly controlling the bottom hole pressure and reestablishing the bottom hole pressure balance are achieved.
The cylinder type throttle valve is the throttle valve which is most suitable for drilling petroleum and natural gas, in particular to a high-pressure and high-yield gas well. The cylinder type throttle valve is easy to lose efficacy due to the blockage of a fluid channel in an inner hole of the valve core and the blockage of a cavity at the end of the valve core and the valve rod when in working process, and the front cavity and the rear cavity of the valve core lose pressure balance and cannot normally adjust the opening; the valve core fixing bolt is easy to loosen and further the valve core is easy to loosen and lose efficacy; is easy to lose effectiveness due to the impact and erosion of the drilling fluid which is born for a long time. The factors causing failure are mainly classified into 3 types, the 1 st type is the factors of target structure and material performance, such as the defects of a throttle valve structure, failure of an opening adjusting function and loosening of a valve core; throttle valve materials, valve core structures (attack angles) and materials (hardness), surface roughness discomfort and the like, category 2 is erosion material performance factors such as the content, shape, size, hardness and the like of solid-phase particles in drilling fluid, and category 3 is environmental factors, gas content, erosion time, fluid speed and the like. The 1 st factor is an essential factor, and the influence of the 1 st factor can be reduced, so that the influence of the 2 nd and 3 rd factors can be simultaneously reduced, the failure of the throttle valve is fundamentally avoided, and the use reliability, impact resistance and erosion resistance of the throttle valve are improved.
At present, the barrel type throttle valve used in China is limited by a valve core structure in the type 1 influencing factors in the aspects of use reliability, impact resistance and erosion resistance, and has obvious short plates. In addition, the falling off and the breakage of the joint of the valve core and the valve rod caused by vibration are also one of the main forms of failure of the valve core.
Disclosure of Invention
In view of this, the invention provides a valve core, which can enable chambers at two ends of the valve core to be always in a communication and pressure balance state, so that the situation that the pressure at two ends of the valve core is unbalanced due to the blockage of a through hole of the valve core and the blockage of a chamber near a valve rod end can be avoided, the throttle valve cannot be subjected to opening adjustment and fails, and the throttle valve is reliable to use.
In order to achieve the purpose, the invention provides the following technical scheme:
a valve core is provided with a through hole penetrating through two end faces, and a side hole communicated with the through hole is formed in the side wall of a first end of the valve core.
Preferably, the first end is of a conical or cylindrical configuration.
Preferably, the quantity of side opening is a plurality of, and is a plurality of the side opening is followed the circumference evenly distributed of first end.
Preferably, the end face of the first end is provided with a screw through hole used for being connected and matched with the valve rod, and the end face of the first end is also provided with a plane used for being abutted and matched with the valve rod.
Preferably, the outer side wall of the second end of the valve core is a plurality of conical surfaces which are arranged in sequence from large to small, and the end part of the second end is a small-diameter end.
Preferably, the included angle between the conical generatrix of the largest conical surface in the plurality of conical surfaces and the conical axis is greater than or equal to 25 °, and the included angles between the conical generatrix of the other conical surfaces and the conical axis are all less than or equal to 6 °.
Preferably, the middle part of the valve core is of a cylindrical structure, and the length of the valve core is greater than or equal to half of the length of the valve core.
A choke valve, comprising: the valve core is the valve core.
Preferably, the method further comprises the following steps: the fixing bolt, the valve rod and the valve core sheath;
the valve core is arranged in the valve core sheath, the valve rod is connected to the first end through the fixing bolt, and the side hole is communicated between the through hole and the cavity close to the end of the valve rod.
Preferably, the method further comprises the following steps: the valve core comprises a valve core sheath and a rubber ring, wherein the rubber ring is arranged between the inner wall of the valve core sheath and the outer wall of the valve core.
According to the technical scheme, the side holes communicated with the through holes are formed in the side wall of the first end of the valve core, and the fluid flow channels are formed in the chambers at the two ends of the valve core, so that fluid is in a flow state in the chambers at the two ends of the valve core, the chambers at the two ends of the valve core are convenient to keep pressure balance, the valve core through holes and the chambers close to the end of the valve rod are prevented from being blocked, the throttle valve can be adjusted in opening degree, and the use reliability of the throttle valve is effectively guaranteed.
The invention also provides a throttle valve using the valve core, and the throttle valve has corresponding beneficial effects due to the adoption of the technical scheme, and specific reference can be made to the previous description, so that the detailed description is omitted.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a front view of a valve cartridge provided by an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a valve cartridge provided in accordance with an embodiment of the present invention;
fig. 3 is an assembly view of a throttle valve according to an embodiment of the present invention.
Wherein, 10 is a valve seat; 20 is a rubber ring; 30 is a valve core, 31 is a first end, 31-1 is a side hole, 31-2 is a screw through hole, 32 is a middle part, 33 is a second end, and 34 is a through hole; 40 is a valve body; 50 is a fixing bolt; 60 is a valve stem; and 70 is a valve core sheath.
Detailed Description
The invention aims to provide an inner hole blockage-free anti-loosening biconical throttle valve core, which can enable chambers at two ends of the valve core to be always in a communicated and pressure balanced state, so that the situation that the pressure at two ends of the valve core is unbalanced due to the blockage of a through hole of the valve core and the blockage of a chamber near the end of a valve rod, the throttle valve cannot be subjected to opening adjustment and fails, and the use reliability of the throttle valve is ensured.
The invention also aims to provide a fixed cone table or cylinder table upper end plane far away from the throttling area of the valve core and the valve seat for the connection of the valve core and the valve rod, so that the looseness of a valve core fixing bolt caused by vibration and overcurrent impact can be avoided, the failure fault of the throttling valve caused by the looseness of the valve core is further avoided, and the reliable use of the throttling valve is ensured.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The valve core provided by the embodiment of the invention has a through hole 34 penetrating through two end faces, and the side wall of the first end 31 of the valve core 30 is provided with a side hole 31-1 communicated with the through hole 34, and the structure of the valve core can be seen in fig. 1.
According to the technical scheme, the side holes communicated with the through holes are formed in the side wall of the first end of the valve core, and the fluid flow channels are formed in the chambers at the two ends of the valve core, so that the chambers at the two ends of the valve core are in a flow state, the chambers at the two ends of the valve core are convenient to keep pressure balance, the valve core through holes and the chambers close to the valve rod end are prevented from being blocked, the throttle valve is guaranteed to be capable of adjusting the opening degree, and the use reliability of the throttle valve is effectively guaranteed.
Preferably, the first end 31 is of a conical or cylindrical configuration, which configuration may be as described with reference to FIG. 1. The conical structure or the cylindrical structure is selected as the head end of the valve core 30, so that the part of the first end 31 adjacent to the side hole can meet the requirement of the wall thickness, and the structural strength of the residual side wall of the first end 31 is ensured, so that the service durability of the valve core 30 is ensured. In particular, the conical configuration of the first end 31 reduces the fluid resistance experienced by the valve element 30 when it is opened.
Specifically, the number of the side holes 31-1 is multiple, so that the flow channel of the fluid in the chamber of the valve core near the valve rod end is enlarged, the flow capacity of the fluid in the chambers at two ends of the valve core is enhanced, and the chambers at two ends of the valve core are helped to keep pressure balance; and the plurality of side holes 31-1 are uniformly distributed along the circumferential direction of the first end 31 to promote the uniform flow of the fluid in the chambers at the two ends of the valve core, so that the additional force applied by the fluid at the first end of the valve core is uniform, thereby ensuring the service durability of the valve core.
In this scheme, the terminal surface of first end 31 has the plane that is used for with valve rod 60 butt cooperation to increase case 30 and the area of valve rod 60 close fit, reduce the connecting piece between the two and take place the possibility of pine and take off because of vibrations, overcurrent impact, ensure the reliability that case 30 and valve rod 60 are connected.
In order to further optimize the technical scheme, the end face of the first end 31 is provided with a screw through hole 31-2 used for being matched with the valve rod 60, and the end face of the first end 31 is also provided with a plane used for being abutted and matched with the valve rod 60, so that the area of the tight matching between the valve core 30 and the valve rod 60 is enlarged. Accordingly, the screw through hole 31-2 is opened in the plane. The flat surface provides a mating flat surface for the connection of the valve element 30 and the valve stem 60, which is away from the throttling area of the valve element 30 and the valve seat 10, which generates vibration. The fixing screw 50 is preferably used as a connection element between the valve element 30 and the valve stem 60. Based on the above-mentioned cooperation plane, can avoid causing because of vibrations, overflowing the valve core fixing bolt 50 pine that the impact leads to and take off, and then lead to the valve core 30 pine to cause the emergence of choke valve failure trouble, ensure that the choke valve uses reliably.
In this solution, the outer side wall of the second end 33 of the valve element 30 is a plurality of tapered surfaces that are sequentially arranged from large to small, and the end portion of the second end 33 is a small-diameter end, so that different axisymmetric circular ring-shaped flow areas are formed in the valve seat 10 by the second end 33, and the fluid impact force applied to the valve element 30 is annularly and uniformly distributed, so as to reduce the radial amplitude and local excessive erosion wear of the valve element 30, and the structure thereof can be referred to fig. 1.
Specifically, the included angle between the conical generatrix of the largest conical surface in the plurality of conical surfaces and the conical axis is greater than or equal to 25 degrees, and the included angles between the conical generatrix of the other conical surfaces and the conical axis are less than or equal to 6 degrees, so as to further optimize the multi-conical-surface structure, reduce the radial amplitude of the valve core and reduce local excessive erosion wear, and the structure can be shown in fig. 2.
In this scheme, the mid portion 32 of case 30 is cylindrical structure, and length is more than or equal to half of case 30 length for increase case 30 and case sheath 70's cooperation slippage, with this reinforcing case 30 feed guide effect, with the radial displacement angle of reducing case 30 in case sheath 70, and then avoid or reduce case 30's radial displacement, thereby reduce the vibrations that the case 30 high frequency repeated radial displacement formed that causes because of the undulant pressure impact of feed liquor, improved the anti-vibration effect.
An embodiment of the present invention further provides a throttle valve, including: a valve core 30 as described above, the structure of which can be seen with reference to fig. 3; due to the adoption of the technical scheme, the method has corresponding beneficial effects, and specific reference can be made to the previous description, so that the detailed description is omitted.
Preferably, the throttle valve further comprises: a fixing bolt 50, a valve stem 60 and a spool protector 70, the structure of which can be seen in fig. 3;
the cartridge 30 is mounted in the cartridge housing 70, the stem 60 is attached to the first end 31 of the cartridge 30 by the fixing bolt 50, and the side hole 31-1 communicates between the through hole 34 and the chamber near the stem end. Namely, after the valve core 30 is assembled into the valve core sheath 70 and is connected and fixed with the valve rod 60 at the first end 31 by the fixing bolt 50, the valve core through hole 34 is not blocked.
In this aspect, the throttle valve further includes: the structure of the valve core 30 comprises a valve core sheath 70 and a rubber ring 20, wherein the rubber ring 20 is arranged between the inner wall of the valve core sheath 70 and the outer wall of the valve core 30, and the structure can be seen in figure 3. The rubber ring 20 plays a role of buffering, and can absorb the shock borne by the valve core 30, so as to further improve the shock-proof effect of the valve core 30. Specifically, the inner groove for installing the rubber ring 20 is formed in the inner wall of the spool sheath 70, so that the rubber ring 20 can be pre-installed. Of course, other mounting manners may also be adopted, for example, compression mounting and forming a clamping groove on the outer wall of the valve element 30, and the like, which are not described herein again. Besides, the rubber ring 20 also plays a role of sealing, so as to block the circulation of fluid in the chambers at the two ends of the valve core 30 along the outer wall of the valve core 30, and ensure that interference items are avoided in the process of keeping the pressure balance between the chambers at the two ends of the valve core 30.
The present solution is further described below with reference to specific embodiments:
the embodiment of the invention provides a double-cone throttle valve core 30 with an inner hole free of blocking and loosening prevention, wherein the valve core 30 is of a hollow integral structure with two penetrating end faces, and one end of the valve core is in the shape of a cross or n-shaped supporting leg type conical table or cylindrical table with a hole partially cut in the side face; the other end is in a multi-conical shape, and the middle of the two ends is in a cylindrical shape. It is installed in the throttle valve chamber composed of valve body 40, valve core sheath 70, valve seat 10, etc. and connected with valve rod 60 by fixing bolt 50.
The hollow integral structure with two penetrating end faces is internally provided with a through hole with larger diameter for communicating the two end faces, and the penetrating through hole is communicated with the large block cutting open hole on the outer side surface of the cylindrical table or the circular truncated cone at the same time.
The side surface partially dissects the appearance of a supporting leg type cone frustum or a cylinder frustum with holes, at least one part of the side surface is dissected in a massive manner, the number of the dissected holes is more than or equal to 1, and the dissected holes are communicated with the penetrating hollow through holes, so that fluid flow channels of chambers at two ends of the valve core 30 are established, the pressure of the chambers at two ends of the valve core 30 is always balanced, and the phenomenon that the chambers at the end of the valve core 30 close to the valve rod 60 cannot be opened due to the fact that a piston compression abnormal high-pressure effect is formed when a throttle valve which is not provided with a flow channel or is blocked by the channels is opened is avoided and eliminated; the throttle valve can not be closed because of the plunger pumping negative pressure effect when being closed.
Meanwhile, the absence of blockage ensures pressure balance across the valve core 30 to reduce the switching resistance of the valve core 30.
1 screw rod through hole of connecting valve rod 60 is opened to circular cone upper end platform face, goes up the diameter of plane and is not less than the diameter of valve rod 60, for the connection of case 30, valve rod 60 provides one and keeps away from the case 30 that produces the vibration and the fixed circular cone upper end plane of disk seat 10 throttle region, can avoid loosing because of vibrations, overcurrent impact lead to case fixing bolt 50 pine take off, and then lead to the case 30 to loosen the emergence of choke valve failure trouble, ensure that the choke valve uses reliably.
The multi-conical surface appearance is formed by continuously combining multiple sections of conical surfaces with different tapers, the included angle between a conical bus tightly connected with the appearance of the cylindrical surface and the axis of the cone is not less than 25 degrees, the diameter of the bottom edge of the cone is the same as the outer diameter of the cylindrical surface, the included angles between the conical buses of the other sections and the axis of the cone are all less than or equal to 6 degrees, the arrangement sequence of the conical surfaces is from the end surface of one end of the multi-conical surface to the direction of the cylindrical surface, the conical buses and the axis of the cone are arranged from small to large, and the number of the sections of the conical surfaces is more than or equal to 3.
The valve core 30 is connected with the valve rod 60 and is arranged in the valve core sheath 70 of the throttle valve, and moves along the center of the valve rod, the axis of the inner hole of the valve core sheath and the axis of the inner hole of the valve seat when in work to form different annular flow areas with the valve seat 10. The shapes of the multi-conical surface and the cylindrical surface are axisymmetric, and the multi-conical surface and the cylindrical surface are matched with the valve seat to ensure that the overflowing surface is in an axisymmetric annular shape, so that the fluid impact force borne by the valve core 30 is uniformly distributed in an annular shape, and the radial amplitude and local excessive erosion and abrasion of the valve core 30 are reduced.
The diameter of the cylindrical surface is the same as that of the bottom surface of the tight connection cone, and the height of the cylindrical surface is not less than 1/2 of the height of the whole valve core 30, so that the radial displacement angle in the valve core sheath is reduced, and further, the radial displacement of the valve core 30 is avoided or reduced, so that the vibration caused by high-frequency repeated radial displacement of the valve core due to the fluctuation pressure impact of the liquid inlet is reduced, and the anti-vibration effect is improved; at least 1 rubber ring 20 is needed to be added between the circular hole surface matched with the valve core and the cylindrical surface, so that the shock can be absorbed to improve the shock-resistant effect of the valve core 30.
The inner hole blockage-free anti-loosening double-cone throttle valve core 30 is integrally processed and manufactured by hard alloy materials, and the erosion resistance effect of the valve core is improved in material.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (4)
1. A valve core is provided with a through hole (34) penetrating through two end faces, and is characterized in that a side hole (31-1) communicated with the through hole (34) is formed in the side wall of a first end (31) of the valve core (30);
the end face of the first end (31) is provided with a screw rod through hole (31-2) used for being connected and matched with the valve rod (60), and the end face of the first end (31) is also provided with a plane used for being abutted and matched with the valve rod (60); the first end (31) is of a conical structure; the number of the side holes (31-1) is multiple, and the multiple side holes (31-1) are uniformly distributed along the circumferential direction of the first end (31);
the outer side wall of the second end (33) of the valve core (30) is a plurality of conical surfaces which are sequentially arranged from large to small, and the end part of the second end (33) is a small-diameter end; the middle part (32) of the valve core (30) is of a cylindrical structure, and the length of the middle part is greater than or equal to half of the length of the valve core (30);
the included angle between the conical generatrix of the largest conical surface in the plurality of conical surfaces and the conical axis is more than or equal to 25 degrees, and the included angles between the conical generatrix of the other conical surfaces and the conical axis are all less than or equal to 6 degrees.
2. A choke valve, comprising: valve cartridge, characterized in that it is a valve cartridge (30) according to claim 1.
3. The throttling valve of claim 2, further comprising: a fixing bolt (50), a valve rod (60) and a valve core sheath (70);
the valve core (30) is installed in the valve core sheath (70), the valve rod (60) is connected to the first end (31) through the fixing bolt (50), and the side hole (31-1) is communicated between the through hole (34) and a chamber close to the end of the valve rod.
4. The throttling valve of claim 2, further comprising: the valve core comprises a valve core sheath (70) and a rubber ring (20), wherein the rubber ring (20) is arranged between the inner wall of the valve core sheath (70) and the outer wall of the valve core (30).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910725577.1A CN112344036B (en) | 2019-08-07 | 2019-08-07 | Throttle valve and valve core thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910725577.1A CN112344036B (en) | 2019-08-07 | 2019-08-07 | Throttle valve and valve core thereof |
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| Publication Number | Publication Date |
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| CN112344036A CN112344036A (en) | 2021-02-09 |
| CN112344036B true CN112344036B (en) | 2023-01-03 |
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| CN201910725577.1A Active CN112344036B (en) | 2019-08-07 | 2019-08-07 | Throttle valve and valve core thereof |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103591303A (en) * | 2013-11-20 | 2014-02-19 | 无锡智能自控工程股份有限公司 | Black water coking-preventing impact-resistant shockproof regulating angle valve special for coal chemical industry |
| CN203979422U (en) * | 2014-07-02 | 2014-12-03 | 普胜特能源（广汉）服务有限公司 | The throttle valve with linear flow characteristic and large through-current capability (Cv value) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7448409B2 (en) * | 2005-03-17 | 2008-11-11 | Fisher Controls International Llc | Fluid flow control device having a throttling element seal |
| CN202927068U (en) * | 2012-11-10 | 2013-05-08 | 无锡智能自控工程股份有限公司 | Array type flow control valve structure suitable for compressible fluid |
| CN204099608U (en) * | 2014-07-28 | 2015-01-14 | 中国石油化工股份有限公司 | A kind of throttle valve |
| JP2019044880A (en) * | 2017-09-04 | 2019-03-22 | 株式会社鷺宮製作所 | Motor valve and refrigeration cycle system |
| CN108443518A (en) * | 2018-04-04 | 2018-08-24 | 盐城雄威石化通用机械设备有限公司 | A kind of high-pressure well mouth surges throttle valve |
| CN210461729U (en) * | 2019-08-07 | 2020-05-05 | 中石化石油工程技术服务有限公司 | Throttle valve and valve core thereof |
-
2019
- 2019-08-07 CN CN201910725577.1A patent/CN112344036B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103591303A (en) * | 2013-11-20 | 2014-02-19 | 无锡智能自控工程股份有限公司 | Black water coking-preventing impact-resistant shockproof regulating angle valve special for coal chemical industry |
| CN203979422U (en) * | 2014-07-02 | 2014-12-03 | 普胜特能源（广汉）服务有限公司 | The throttle valve with linear flow characteristic and large through-current capability (Cv value) |
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