CN112856033B - Novel throttle valve rod structure - Google Patents
Novel throttle valve rod structure Download PDFInfo
- Publication number
- CN112856033B CN112856033B CN202110305850.2A CN202110305850A CN112856033B CN 112856033 B CN112856033 B CN 112856033B CN 202110305850 A CN202110305850 A CN 202110305850A CN 112856033 B CN112856033 B CN 112856033B
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- valve rod
- ceramic
- rubber gasket
- damping spring
- gland
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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
- F16K51/00—Other details not peculiar to particular types of valves or cut-off apparatus
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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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
- F16F15/06—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs
- F16F15/067—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs using only wound springs
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Lift Valve (AREA)
- Sliding Valves (AREA)
Abstract
The invention relates to the technical field of throttle valves and discloses a novel throttle valve rod structure which comprises a metal valve rod, wherein a rubber gasket is arranged on the outer surface of the metal valve rod, a ceramic valve needle is arranged on the outer surface of the rubber gasket, a threaded hole is formed in the outer surface of the ceramic valve needle, a gland is arranged on the outer surface of the metal valve rod, a connecting hole is formed in the outer surface of the gland, a screw is arranged inside the connecting hole, a limiting groove is formed in the outer surface of the head of the metal valve rod, a damping spring is arranged inside the limiting groove, and a buffer plate is arranged at one end of the damping spring. This novel choke valve rod structure, it is stronger to possess choke valve rod durability effect, and the effect of buffering is better, and life is longer, has solved simultaneously and has used comparatively inconvenient problem to the change of choke valve rod head component after the longer time, and is comparatively convenient, can bring better use prospect in the production of oil and natural gas.
Description
Technical Field
The invention relates to the technical field of throttle valves, in particular to a novel throttle valve rod structure.
Background
The liquid flow produced from a well is generally required to be controlled in oil and natural gas production, most oil and natural gas production facilities use a throttle valve to control the flow of fluid produced from the well, the throttle valve is usually installed on a gas production or oil production wellhead device, and the common throttle valves are divided into needle type, cage type, piston type and other types according to the difference of the throttling modes, wherein the needle type throttle valve is the most common throttle valve in the oil and gas industry field oil and gas production well head.
The existing throttle valve rod structure usually adopts ordinary carbon steel when using, the stainless steel valve rod leads to the wearability poor easily, and wear-resisting corrosion-resistant high hardness metal is expensive, need change valve rod assembly after the wearing and tearing corrodes, trade such as oil field is changed the valve rod and is influenced production, the loss is big, and the danger coefficient is great moreover, the durability effect is relatively poor, secondly, it is comparatively inconvenient to the change of throttle valve rod head component after using longer time, be unfavorable for the permanent use of throttle valve rod, we propose a novel throttle valve rod structure for this reason.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a novel throttle valve rod structure which has the advantages of stronger durability effect of a throttle valve rod and capability of solving the problem of inconvenient replacement of a component at the head part of the throttle valve rod after being used for a longer time.
(II) technical scheme
In order to realize the purposes of stronger durability effect of the throttle valve rod and more convenient replacement of the component at the head part of the throttle valve rod after being used for a longer time, the invention provides the following technical scheme: the utility model provides a novel throttle valve rod structure, includes the metal valve rod, the surface of metal valve rod is provided with the rubber gasket, the surface of rubber gasket is provided with ceramic valve needle, the surface of ceramic valve needle is provided with the screw hole, the surface of metal valve rod is provided with the gland, the surface of gland is provided with the connecting hole, the inside of connecting hole is provided with the screw, the head surface of metal valve rod is provided with the spacing groove, the inside of spacing groove is provided with damping spring, damping spring's one end is provided with the buffer board.
Preferably, the rubber gasket is movably connected with the metal valve rod, the rubber gasket is attached to the metal valve rod, the ceramic valve needle is movably connected with the rubber gasket, and the threaded hole is matched with the connecting hole.
By adopting the technical scheme, the following technical effects can be achieved: the valve rod component is convenient to mount, dismount and replace parts such as the rubber gasket.
Preferably, the screw and the screw hole phase-match, connecting hole and screw phase-match, the gland is cyclic annular, be fixed connection between gland and the metal valve rod, be swing joint between gland and the ceramic needle, be the rotation connection between screw and the gland, be the rotation connection between ceramic needle and the screw.
By adopting the technical scheme, the following technical effects can be achieved: the matching effect between the valve rod part components is facilitated, and the components are convenient to connect.
Preferably, the limiting groove is located in the center of the head of the metal valve rod, the damping spring is movably connected with the metal valve rod, the limiting groove is matched with the damping spring, and the damping spring is movably connected with the buffer plate.
By adopting the technical scheme, the following technical effects can be achieved: the mobility of the valve rod part component is facilitated, and the function of the valve rod part component is convenient to exert.
Preferably, the spacing groove is sunken cylindric, be sliding connection between buffer board and the metal valve rod, the buffer board is cylindric, the diameter of buffer board equals with the diameter of spacing groove.
By adopting the technical scheme, the following technical effects can be achieved: the buffer plate and the metal valve rod can slide relatively, so that the buffer effect is achieved.
Preferably, the rubber gasket is made of a rubber material with high elasticity.
By adopting the technical scheme, the following technical effects can be achieved: the durability effect of the valve rod structure is enhanced.
Preferably, the number of the threaded holes, the number of the connecting holes and the number of the screws are all a plurality of groups and are distributed in an array.
By adopting the technical scheme, the following technical effects can be achieved: the stability effect of the ceramic valve needle on the metal valve rod is facilitated.
Preferably, the ceramic valve needle is made of a ceramic material with high hardness, wear resistance and corrosion resistance, and the damping spring is made of a high-elasticity material.
By adopting the technical scheme, the following technical effects can be achieved: the durability effect of the ceramic valve needle is facilitated.
(III) advantageous effects
Compared with the prior art, the invention provides a novel throttle valve rod structure, which has the following beneficial effects:
1. this novel choke valve rod structure, through the rubber gasket, the ceramic valve needle, the spacing groove, the effect of damping spring and buffer board, when using, through the high rigidity, it is wear-resisting, the ceramic valve needle that corrosion-resistant ceramic material made replaces original metal head, and assist with the rubber gasket, cooperate the spacing groove simultaneously, the effect of damping spring and buffer board, accomplish the injecing to damping spring and buffer board position through the spacing groove, cooperate the rubber piece to accomplish the buffering in the choke valve rod structure use, thereby make the valve rod can satisfy more abominable operating mode, more permanent life-span, the in-process of use, the medium is on a parallel with metal valve rod axis direction buffering to the ceramic valve needle, the ceramic valve needle has the high rigidity because of itself, high wear resistance and high corrosion resistance's characteristic, thereby can bear long-term high pressure, the medium of high velocity of flow and high corrosivity erodees, simultaneously, the ceramic valve needle gives the rubber gasket with the undulant impact transmission of medium, the rubber gasket has the high elasticity, cooperate the spacing groove simultaneously, the cushioning effect of damping spring and buffer board, the impact that the real-time buffering ceramic valve needle received, thereby the ceramic valve needle can prevent that the extrusion effect that the ceramic valve needle from receiving the extrusion screw can be used from the higher pressure, thereby the effect.
2. This novel throttle valve rod structure, through ceramic valve needle, the screw hole, the gland, the combined action of connecting hole and screw, the in-process of use, when throttle valve rod structure uses ceramic valve needle when needing to be changed after the longer time, the user can use corresponding wrong nail equipment, rotate and unscrew the screw, later with ceramic valve needle outwards pull take out can, thereby can according to actual demand take out rubber gasket and damping spring and the outside pulling of buffer board and change simultaneously, on the contrary, when needing the installation, the user only need overlap ceramic valve needle on the metal valve rod, and corresponding with the position of screw hole and the position of connecting hole, later again correspond the root of screw to the connecting hole position and rotate to tighten, make gland closely laminate with ceramic valve needle can, it is more convenient to throttle valve rod head component's change after using the longer time, the effect of use is better.
Drawings
FIG. 1 is a front cross-sectional view of the present invention in its entirety;
FIG. 2 is a partial structural view of the screw assembly of the present invention;
FIG. 3 is a partial enlarged view of the position of the spacing groove of the structure of the present invention.
In the figure: 1. a metal valve stem; 2. a rubber gasket; 3. a ceramic valve needle; 4. a threaded hole; 5. a gland; 6. connecting holes; 7. a screw; 8. a limiting groove; 9. a damping spring; 10. a buffer plate.
Detailed Description
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.
Referring to fig. 1-3, a novel throttle valve rod structure comprises a metal valve rod 1, wherein a rubber gasket 2 is arranged on the outer surface of the metal valve rod 1, a ceramic valve needle 3 is arranged on the outer surface of the rubber gasket 2, a threaded hole 4 is formed in the outer surface of the ceramic valve needle 3, a gland 5 is arranged on the outer surface of the metal valve rod 1, a connecting hole 6 is formed in the outer surface of the gland 5, a screw 7 is arranged inside the connecting hole 6, a limiting groove 8 is formed in the outer surface of the head of the metal valve rod 1, a damping spring 9 is arranged inside the limiting groove 8, and a buffer plate 10 is arranged at one end of the damping spring 9.
Be swing joint between rubber gasket 2 and the metal valve rod 1, rubber gasket 2 laminates with metal valve rod 1 mutually, is swing joint between ceramic needle 3 and the rubber gasket 2, and screw hole 4 and connecting hole 6 phase-match are favorable to the installation of parts valve rod components such as rubber gasket 2 and dismantlement change etc. do benefit to rubber gasket 2 and metal valve rod 1's connection coincide nature simultaneously.
Screw 7 and screw hole 4 phase-match, connecting hole 6 and screw 7 phase-match, gland 5 is cyclic annular, be fixed connection between gland 5 and the metal valve rod 1, be swing joint between gland 5 and the ceramic needle 3, be connected for rotating between screw 7 and the gland 5, be connected for rotating between ceramic needle 3 and the screw 7, do benefit to the matching effect between the partial component of valve rod, and then make things convenient for the connection between the component, do benefit to simultaneously that the rotation of screw 7 is screwed up from fixing relevant component position.
The rubber gasket 2 is made of a high-elasticity rubber material, and is favorable for enhancing the durability and the buffering effect of the valve rod structure.
The number of the threaded holes 4, the connecting holes 6 and the screws 7 is a plurality of groups and distributed in an array mode, and the stability effect of the ceramic valve needle 3 on the metal valve rod 1 is facilitated.
The ceramic valve needle 3 is made of high-hardness, wear-resistant and corrosion-resistant ceramic materials, and the damping spring 9 is made of high-elasticity materials, so that the durability effect of the ceramic valve needle 3 is facilitated.
When the valve rod structure works, the ceramic valve needle 3 made of high-hardness, wear-resistant and corrosion-resistant ceramic materials replaces an original metal head, the rubber gasket 2 is used as an auxiliary, the limiting groove 8, the damping spring 9 and the buffer plate 10 are matched, the limiting of the positions of the damping spring 9 and the buffer plate 10 is completed through the limiting groove 8, and the buffer of the throttle valve rod structure in the using process is completed through the matching of the rubber sheet, so that the valve rod can meet the more severe working conditions and has longer service life, in the using process, a medium is flushed to the ceramic valve needle 3 in the direction parallel to the axis of the metal valve rod 1, the ceramic valve needle 3 has the characteristics of high hardness, high wear resistance and high corrosion resistance due to the fact that the ceramic valve needle has the characteristics of high hardness, high flow rate and high corrosion resistance, and can bear the medium flushing of long-term high pressure, high flow rate and high corrosion resistance, meanwhile, the ceramic valve needle 3 transmits the fluctuation impact of the medium to the rubber gasket 2, and the rubber gasket 2 has high elasticity, meanwhile, the buffer action of the limiting groove 8, the damping spring 9 and the buffer plate 10 is matched, the impact on the ceramic valve needle 3 is buffered in real time, the ceramic valve needle 3 is protected from being brittle due to sudden impact, the gland 5 is fixed on the ceramic valve needle 3 through the screw 7, so that the gland 5 can compress the rubber gasket 2 and further prevent the rubber gasket from being extruded and deformed outwards, the position of the ceramic valve needle 3 is adjusted through the up-and-down movement of the metal valve rod 1, the flow of the throttle valve is adjusted, the durability effect is strong, the use effect is good, in the whole using process of the valve rod, when the ceramic valve needle 3 needs to be replaced after the throttle valve rod structure is used for a long time, a user can use the corresponding screwing device to rotate and unscrew the screw 7, then the ceramic valve needle 3 is pulled outwards to be taken out, and meanwhile, the rubber gasket 2, the damping spring 9 and the buffer plate 10 can be pulled outwards to be taken out for replacement according to actual requirements, on the contrary, when needing the installation, the user only needs to overlap ceramic valve needle 3 on metal valve rod 1 to correspond the position of screw hole 4 with the position of connecting hole 6, later with the root of screw 7 corresponding to connecting hole 6 position rotation screw up again, make gland 5 with ceramic valve needle 3 closely laminate can mutually, it is comparatively convenient to the change of choke valve rod head component after using the longer time, the practicality effect is better.
In conclusion, under the action of the rubber gasket 2, the ceramic valve needle 3, the limiting groove 8, the damping spring 9 and the buffer plate 10, the ceramic valve needle 3 made of high-hardness, wear-resistant and corrosion-resistant ceramic materials replaces an original metal head when in use, the rubber gasket 2 is used for assisting the limiting groove 8, the damping spring 9 and the buffer plate 10, the limiting groove 8 is used for limiting the positions of the damping spring 9 and the buffer plate 10, and the rubber sheet is used for buffering the throttle valve rod structure in the use process, so that the valve rod can meet worse working conditions and has longer service life, in the use process, a medium is buffered towards the ceramic valve needle 3 in a direction parallel to the axis of the metal valve rod 1, and the ceramic valve needle 3 has the characteristics of high hardness, high wear resistance and high corrosion resistance, so that the medium scouring with long-term high pressure, high flow rate and high corrosion resistance can be borne, meanwhile, the ceramic valve needle 3 transmits the fluctuation impact of the medium to the rubber gasket 2, the rubber gasket 2 has high elasticity, and simultaneously cooperates with the buffer action of the limiting groove 8, the damping spring 9 and the buffer plate 10 to buffer the impact on the ceramic valve needle 3 in real time, so as to protect the ceramic valve needle 3 from brittle fracture due to sudden impact, the gland 5 is fixed on the ceramic valve needle 3 by the screw 7, so that the gland 5 can compress the rubber gasket 2, and further prevent the rubber gasket from being extruded to deform outwards, the metal valve rod 1 adjusts the position of the ceramic valve needle 3 through the up-and-down movement, so as to adjust the flow of the throttle valve, the durability effect is strong, through the cooperation of the ceramic valve needle 3, the threaded hole 4, the gland 5, the connecting hole 6 and the screw 7, in the using process, when the ceramic valve needle 3 needs to be replaced after the throttle valve rod structure is used for a long time, a user can use a corresponding screw screwing device, screw 7 is unscrewed in the rotation, later with ceramic needle 3 outwards pull out again can, thereby can take out rubber gasket 2 and damping spring 9 and the outside pulling of buffer board 10 according to actual demand simultaneously and change, otherwise, when needing the installation, the user only needs to overlap ceramic needle 3 on metal valve rod 1, and corresponding with the position of screw hole 4 with the position of connecting hole 6, later corresponding to connecting hole 6 position with the root of screw 7 again and rotating and screwing up, make gland 5 closely laminate with ceramic needle 3 mutually can, thereby it is comparatively convenient to the change of choke valve rod head component after using the longer time, the practicality effect is stronger.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. The utility model provides a novel throttle valve rod structure, includes metal valve rod (1), its characterized in that: the outer surface of the metal valve rod (1) is provided with a rubber gasket (2), the outer surface of the rubber gasket (2) is provided with a ceramic valve needle (3), the outer surface of the ceramic valve needle (3) is provided with a threaded hole (4), the outer surface of the metal valve rod (1) is provided with a gland (5), the outer surface of the gland (5) is provided with a connecting hole (6), a screw (7) is arranged inside the connecting hole (6), the outer surface of the head of the metal valve rod (1) is provided with a limiting groove (8), a damping spring (9) is arranged inside the limiting groove (8), and one end of the damping spring (9) is provided with a buffer plate (10);
the rubber gasket (2) is movably connected with the metal valve rod (1), the rubber gasket (2) is attached to the metal valve rod (1), the ceramic valve needle (3) is movably connected with the rubber gasket (2), and the threaded hole (4) is matched with the connecting hole (6);
the screw (7) is matched with the threaded hole (4), the connecting hole (6) is matched with the screw (7), the gland (5) is annular, the gland (5) is fixedly connected with the metal valve rod (1), the gland (5) is movably connected with the ceramic valve needle (3), the screw (7) is rotatably connected with the gland (5), and the ceramic valve needle (3) is rotatably connected with the screw (7);
the limiting groove (8) is positioned in the center of the head of the metal valve rod (1), the damping spring (9) is movably connected with the metal valve rod (1), the limiting groove (8) is matched with the damping spring (9), and the damping spring (9) is movably connected with the buffer plate (10);
spacing groove (8) are sunken cylindricly, be sliding connection between buffer board (10) and metal valve rod (1), buffer board (10) are cylindricly, the diameter of buffer board (10) equals with the diameter of spacing groove (8).
2. The novel throttle valve stem structure of claim 1, wherein: the rubber gasket (2) is made of a high-elasticity rubber material.
3. The novel throttle valve stem structure of claim 1, wherein: the number of the threaded holes (4), the number of the connecting holes (6) and the number of the screws (7) are all a plurality of groups and are distributed in an array.
4. The novel throttle valve stem structure of claim 1, wherein: the ceramic valve needle (3) is made of a high-hardness, wear-resistant and corrosion-resistant ceramic material, and the damping spring (9) is made of a high-elasticity material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110305850.2A CN112856033B (en) | 2021-03-23 | 2021-03-23 | Novel throttle valve rod structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110305850.2A CN112856033B (en) | 2021-03-23 | 2021-03-23 | Novel throttle valve rod structure |
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| Publication Number | Publication Date |
|---|---|
| CN112856033A CN112856033A (en) | 2021-05-28 |
| CN112856033B true CN112856033B (en) | 2023-02-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110305850.2A Active CN112856033B (en) | 2021-03-23 | 2021-03-23 | Novel throttle valve rod structure |
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| CN (1) | CN112856033B (en) |
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|---|---|---|---|---|
| CN2057253U (en) * | 1989-03-30 | 1990-05-16 | 杨大昌 | Leakless stop valve |
| EP0892200A2 (en) * | 1998-07-09 | 1999-01-20 | Firma Altenburger Armaturenwerk und Metallgiesserei GmbH | Compressor shut-off valve |
| CN201318454Y (en) * | 2008-12-23 | 2009-09-30 | 上海神开石油化工装备股份有限公司 | Thread clamping connecting device used for connecting valve rod and pinhead in throttle |
| CN201373172Y (en) * | 2008-06-13 | 2009-12-30 | 彭真武 | 'S'-shaped corrugated diaphragm stop valve |
| CN102011881A (en) * | 2010-12-07 | 2011-04-13 | 苏州新格朗富机械科技有限公司 | Mute check valve |
| CN103206547A (en) * | 2013-04-12 | 2013-07-17 | 上海开维喜阀门集团有限公司 | Anti-impact stop valve sealing structure |
| CN206754387U (en) * | 2017-04-25 | 2017-12-15 | 甘肃天恩重工科技有限公司 | A kind of improved high-voltage needle-valve |
| CN207598975U (en) * | 2017-09-25 | 2018-07-10 | 浙江石化阀门有限公司 | The valve rod buffer structure of liquid operated globe valve |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203051804U (en) * | 2013-01-21 | 2013-07-10 | 浙江维兰特流体科技有限公司 | Full-bore sterile valve |
| CN103791102B (en) * | 2013-05-13 | 2016-01-27 | 哈尔滨工程大学 | The latent kingston valve of a kind of hydraulic pressure |
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2021
- 2021-03-23 CN CN202110305850.2A patent/CN112856033B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2057253U (en) * | 1989-03-30 | 1990-05-16 | 杨大昌 | Leakless stop valve |
| EP0892200A2 (en) * | 1998-07-09 | 1999-01-20 | Firma Altenburger Armaturenwerk und Metallgiesserei GmbH | Compressor shut-off valve |
| CN201373172Y (en) * | 2008-06-13 | 2009-12-30 | 彭真武 | 'S'-shaped corrugated diaphragm stop valve |
| CN201318454Y (en) * | 2008-12-23 | 2009-09-30 | 上海神开石油化工装备股份有限公司 | Thread clamping connecting device used for connecting valve rod and pinhead in throttle |
| CN102011881A (en) * | 2010-12-07 | 2011-04-13 | 苏州新格朗富机械科技有限公司 | Mute check valve |
| CN103206547A (en) * | 2013-04-12 | 2013-07-17 | 上海开维喜阀门集团有限公司 | Anti-impact stop valve sealing structure |
| CN206754387U (en) * | 2017-04-25 | 2017-12-15 | 甘肃天恩重工科技有限公司 | A kind of improved high-voltage needle-valve |
| CN207598975U (en) * | 2017-09-25 | 2018-07-10 | 浙江石化阀门有限公司 | The valve rod buffer structure of liquid operated globe valve |
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| CN112856033A (en) | 2021-05-28 |
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