CN111664087A - Long-life split type valve seat - Google Patents

Long-life split type valve seat Download PDF

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Publication number
CN111664087A
CN111664087A CN202010607089.3A CN202010607089A CN111664087A CN 111664087 A CN111664087 A CN 111664087A CN 202010607089 A CN202010607089 A CN 202010607089A CN 111664087 A CN111664087 A CN 111664087A
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CN
China
Prior art keywords
hole
bushing
valve seat
base
diameter
Prior art date
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Pending
Application number
CN202010607089.3A
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Chinese (zh)
Inventor
李海龙
李晓斌
郭子蒙
姜琛
王继鑫
李朋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yantai Jereh Petroleum Equipment and Technologies Co Ltd
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Yantai Jereh Petroleum Equipment and Technologies Co Ltd
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Application filed by Yantai Jereh Petroleum Equipment and Technologies Co Ltd filed Critical Yantai Jereh Petroleum Equipment and Technologies Co Ltd
Priority to CN202010607089.3A priority Critical patent/CN111664087A/en
Publication of CN111664087A publication Critical patent/CN111664087A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/108—Valves characterised by the material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/1087—Valve seats

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lift Valve (AREA)

Abstract

The invention discloses a long-life split type valve seat which comprises a lining and a base, wherein the lining is embedded into the outlet end of the base, the lining is matched with a valve body for use, and the lining is made of tungsten carbide alloy. Has the advantages that: the valve seat consists of the bushing and the base, the bushing is made of hard alloy materials, so that the hardness, strength, wear resistance, corrosion resistance and other properties of the bushing are improved, and the service life of the valve seat is greatly prolonged; the valve seat is of a split structure, once the valve seat is abraded, only the lining or the base needs to be replaced, the whole valve seat does not need to be replaced, the valve seat is convenient to maintain, time and labor are saved, and meanwhile, the production cost of the oil-gas field is reduced; the bushing can select a proper diameter according to the working pressure, the conveying medium, the abrasion degree of the valve body to the valve seat and the like in the actual working condition, and the application range is wide; the bush and the base are in various shapes and can be combined according to actual working condition requirements, and applicability is strong.

Description

Long-life split type valve seat
Technical Field
The invention relates to the technical field of plunger pumps, in particular to a long-life split type valve seat.
Background
At present, fracturing construction in oil and gas field exploitation is a main yield increasing mode, a plunger pump is main equipment for pumping fracturing medium at high pressure in oil and gas field exploitation yield increasing operation, along with continuous development of ultrahigh pressure, ultra-deep wells and horizontal wells of oil and gas fields, the operation working conditions of the plunger pump are increasingly severe, high-pressure and large-discharge operation is required, particularly in unconventional oil and gas operation, shale gas operation is required, the operation pressure sometimes reaches 120MPa, the working conditions are severe, continuity, large-discharge and high-pressure operation is required, and parts of the plunger pump are easy to wear. The linear reciprocating motion of the plunger pump drives the pressure intensity in the cavity of the valve box at the hydraulic end of the plunger pump to change, so that the opening and the closing of the valve body are periodically changed. Because the valve body collides with the valve seat when being closed and the high-pressure operation aggravates the collision between the valve body and the valve seat, the valve seat is easy to wear, corrode, crack and the like, and the valve seat has short service life, low wear resistance and frequent replacement. And the valve seat that adopts in the oil and gas field production operation at present is integrated into one piece mostly, in case take place wearing and tearing need whole change, wastes time and energy, influences oil and gas field operation progress, increases oil and gas field operating cost.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides the long-life split type valve seat which is composed of the bushing and the base, wherein the bushing is made of hard alloy materials, so that the hardness, the strength, the wear resistance, the corrosion resistance and other properties of the bushing are improved, and the service life of the valve seat is greatly prolonged; the valve seat is of a split structure, once the valve seat is abraded, only the lining or the base needs to be replaced, the whole valve seat does not need to be replaced, the valve seat is convenient to maintain, time and labor are saved, and the production cost of the oil-gas field is reduced; the bushing can select a proper diameter according to parameters such as working pressure, a conveying medium, the abrasion degree of the valve body to the valve seat and the like in an actual working condition, and the application range is wide; the bush and the base are in various shapes and can be combined according to actual working condition requirements, and applicability is strong.
The aim of the invention is achieved by the following technical measures: the utility model provides a split type valve seat of long-life, includes bush and base, the bush embedding is at the exit end of base, the bush uses with the cooperation of the valve body, the bush is the tungsten carbide alloy.
Further, the tungsten carbide alloy includes nickel-based tungsten carbide or cobalt-based tungsten carbide.
Further, the bushing is of a cylindrical structure or a circular truncated cone structure, when the bushing is of a circular truncated cone structure, the diameter of the upper bottom surface of the bushing is larger than that of the lower bottom surface of the bushing, a first through hole is formed in the bushing and comprises a first circular truncated cone through hole and a first cylinder through hole which are sequentially communicated from top to bottom, the diameter of the upper bottom surface of the first circular truncated cone through hole is larger than that of the lower bottom surface of the first circular truncated cone through hole, and the diameter of the lower bottom surface of the first circular truncated cone through hole is the same as that of the first cylinder through hole.
Further, when the bushing is in a circular truncated cone structure, the taper of the bushing is 1:8-1: 16.
Furthermore, the contact surface of the valve body and the bushing is a valve body working surface, and the diameter of the upper bottom surface of the first circular truncated cone through hole is the same as the maximum diameter of the valve body working surface or the same as the maximum outer diameter of the valve rubber.
Further, the base is round platform type structure or T type structure, and when being round platform type structure, the last bottom surface diameter of base is greater than bottom surface diameter down, and when being T type structure, the base includes cylinder head and round platform afterbody that from the top down connects gradually, the last bottom surface diameter of round platform afterbody is greater than bottom surface diameter down, the diameter of cylinder head is greater than the last bottom surface diameter of round platform afterbody.
Further, the base is provided with a second through hole, the second through hole comprises a second circular truncated cone through hole, a bush embedding hole and a second cylinder through hole which are sequentially communicated from top to bottom, the diameter of the upper bottom surface of the second circular truncated cone through hole is larger than that of the lower bottom surface, the minimum diameter of the bush embedding hole is larger than that of the second cylinder through hole, when the bush is embedded into the base, the conical surface of the second circular truncated cone through hole is flush with that of the first circular truncated cone through hole, and the side surface of the first cylinder through hole is flush with that of the second cylinder through hole.
Further, the base is provided with a second through hole, the second through hole comprises a bush embedding hole and a second cylinder through hole which are sequentially communicated from top to bottom, the minimum diameter of the bush embedding hole is larger than that of the second cylinder through hole, and when the bush is embedded in the base, the side face of the first cylinder through hole is flush with the side face of the second cylinder through hole.
Furthermore, the base is further provided with an annular groove on a table top formed by the bushing embedding hole and the second cylindrical through hole, and an O-shaped ring is arranged in the annular groove.
Compared with the prior art, the invention has the beneficial effects that: the long-life split type valve seat comprises the bushing and the base, wherein the bushing is made of hard alloy materials, so that the hardness, strength, wear resistance, corrosion resistance and other properties of the bushing are improved, and the service life of the valve seat is greatly prolonged; the valve seat is of a split structure, once the valve seat is abraded, only the lining or the base needs to be replaced, the whole valve seat does not need to be replaced, the valve seat is convenient to maintain, time and labor are saved, and the production cost of the oil-gas field is reduced; the bushing can select a proper diameter according to parameters such as working pressure, a conveying medium, the abrasion degree of the valve body to the valve seat and the like in an actual working condition, and the application range is wide; the bush and the base are in various shapes and can be combined according to actual working condition requirements, and applicability is strong.
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a schematic view of a bushing and base combination.
Fig. 2 is a structural schematic diagram of a bushing and base combination two.
Fig. 3 is a schematic structural view of a bushing and base combination iii.
Fig. 4 is a schematic view of the structure of a bushing of cylindrical structure.
Fig. 5 is a schematic view of a bushing of frustoconical configuration.
FIG. 6 is a schematic diagram of a first base structure with a T-shaped structure.
FIG. 7 is a schematic view of a second base structure with a T-shaped structure.
Fig. 8 is a schematic view of a base structure iii of a T-shaped structure.
Fig. 9 is a schematic view of a base structure four of the T-shaped structure.
Fig. 10 is a schematic view of a base structure five of the T-shaped structure.
Fig. 11 is a schematic view of a base structure six of the T-shaped structure.
The valve comprises a valve body 1, a valve rubber 2, a bushing 3, a base 4, a first circular truncated cone through hole 5, a first cylinder through hole 6, a second circular truncated cone through hole 7, a bushing embedding hole 8, a second cylinder through hole 9, an annular groove 10 and an O-shaped ring 11.
Detailed Description
As shown in fig. 1 to 11, the long-life split valve seat comprises a bushing 3 and a base 4, wherein the bushing 3 is embedded in an outlet end of the base 4, the bushing 3 is matched with the valve body 1 for use, and the bushing 3 is made of tungsten carbide alloy. Further preferably, the tungsten carbide alloy comprises nickel-based tungsten carbide or cobalt-based tungsten carbide. The valve seat is composed of a lining 3 and a base 4, the valve seat is of a split structure, once the valve seat is worn, only the lining 3 or the base 4 needs to be replaced, the whole valve seat does not need to be replaced, the valve seat is convenient to maintain, and time and labor are saved; the bushing 3 is made of hard alloy materials, so that the performances of hardness, strength, wear resistance, corrosion resistance and the like of the bushing 3 are improved, the service life of the valve seat is greatly prolonged, and the base 4 can be made of common alloy steel materials, so that the damage of the valve seat is effectively reduced, and the production cost of the oil and gas field can be reduced.
The bushing 3 is of a cylinder structure or a circular truncated cone structure, the bushing 3 is provided with a first through hole, the first through hole comprises a first circular truncated cone through hole 5 and a first cylinder through hole 6 which are sequentially communicated from top to bottom, the diameter of the upper bottom surface of the first circular truncated cone through hole 5 is larger than that of the lower bottom surface, and the diameter of the lower bottom surface of the first circular truncated cone through hole 5 is the same as that of the first cylinder through hole 6. The valve body 1 can be inserted into the lining 3 through the first through hole and is contacted with the conical surface of the first round platform through hole 5 when the valve body works. Further preferably, when the bush 3 is in a circular truncated cone structure, the taper of the bush 3 is 1:8-1: 16. The bush 3 can be assembled with the base 4 by adopting an interference assembly method, and when the bush 3 is of a cylindrical structure, the assembly of the bush and the base 4 can be realized by adopting a temperature difference method. When the bush 3 has a circular truncated cone structure, the bush 3 and the base 4 can be preferably assembled by press-fitting. The bushing 3 with different structural forms can be selected according to the requirements of actual working conditions.
The contact surface of the valve body 1 and the lining 3 is a working surface of the valve body 1, and the diameter of the upper bottom surface of the first circular truncated cone through hole 5 is the same as the maximum diameter of the working surface of the valve body 1 or the same as the maximum outer diameter of the valve rubber 2. When the valve body 1 works, the valve body 1 can drive the valve rubber 2 to collide with the valve seat, when the diameter of the upper bottom surface of the first circular truncated cone through hole 5 is the same as the maximum diameter of the working surface of the valve body 1, the bushing 3 is only in contact with the valve body 1 and is not in contact with the valve rubber 2, at the moment, the valve body 1 collides with the bushing 3, the valve rubber 2 collides with the base 4, and the bushing 3 and the base 4 can be abraded at the same time. When the diameter of the upper bottom surface of the first circular truncated cone through hole 5 is the same as the maximum outer diameter of the valve rubber 2, the bushing 3 is simultaneously in contact with the valve body 1 and the valve rubber 2, at the moment, the valve body 1 and the valve rubber 2 simultaneously collide with the bushing 3, and the bushing 3 can be abraded. In actual work, the diameter of the bushing 3 can be properly selected according to factors such as working condition pressure, oil-gas field operation cost and the like.
The base 3 is round platform type structure or T type structure, and when being round platform type structure, the last bottom surface diameter of base 3 is greater than bottom surface diameter down, and when being T type structure, base 3 includes cylinder head and round platform afterbody that from the top down connects gradually, the last bottom surface diameter of round platform afterbody is greater than bottom surface diameter down, the diameter of cylinder head is greater than the last bottom surface diameter of round platform afterbody. In practical work, the shape of the base 3 can be selected according to the structure of the hydraulic end valve box of the plunger pump.
The base 4 is provided with a second through hole, the second through hole comprises a second circular truncated cone through hole 7, a bush embedding hole 8 and a second cylinder through hole 9 which are sequentially communicated from top to bottom, and the shape of the bush embedding hole 8 is matched with that of the bush 3. The diameter of the upper bottom surface of the second circular truncated cone through hole 7 is larger than that of the lower bottom surface, the minimum diameter of the bushing embedding hole 8 is larger than that of the second cylinder through hole 9, when the bushing 3 is embedded in the base 4, the conical surface of the second circular truncated cone through hole 7 is flush with the conical surface of the first circular truncated cone through hole 5, and the side surface of the first cylinder through hole 6 is flush with the side surface of the second cylinder through hole 9. Specifically, the base 4 is preferably matched with the bushing 3 with the maximum diameter of the first circular truncated cone through hole 5 being the same as the maximum diameter of the working surface of the valve body 2, and when the valve body 2 is closed, the conical surface of the second circular truncated cone through hole 7 is flush with the conical surface of the first circular truncated cone through hole 5, so that the sealing performance between the valve body 1 and the valve rubber 2 as well as the valve seat can be effectively guaranteed. The side surface of the first cylindrical through hole 6 is flush with the side surface of the second cylindrical through hole 7, so that the valve body 1 can be prevented from moving up and down in the valve seat.
The base 4 is provided with a second through hole which comprises a bush embedding hole 8 and a second cylindrical through hole 9 which are communicated from top to bottom in sequence, and the shape of the bush embedding hole 8 is matched with that of the bush 3. The minimum diameter of the bush-insertion hole 8 is larger than the diameter of the second cylinder through-hole 9, and the side surface of the first cylinder through-hole 5 is flush with the side surface of the second cylinder through-hole 9 when the bush 3 is inserted into the base 4. Specifically, the pedestal 4 is preferably matched with the bushing 3 with the maximum diameter of the first circular truncated cone through hole 5 being the same as the maximum outer diameter of the valve rubber 2, so that the valve body 1 is prevented from moving up and down in the valve seat.
The base 4 is further provided with an annular groove 10 on a table top formed by the bush embedding hole 8 and the second cylinder through hole 9, and an O-shaped ring 11 is arranged in the annular groove 10. The O-ring 11 may increase the sealing of the bushing 3 and the base 4.
The structural characteristics of the bush 3 and the base 4 comprise the shape of the bush 3, the size of the bush 3, the shape of the base 4 and the structure of a second through hole in the base 4, wherein the shape of the bush 3 comprises 2 types which are respectively of a cylindrical structure or a circular truncated cone structure; the size of the bush 3 comprises 2 sizes, namely the maximum diameter of the bush 3 is equal to the maximum diameter of the working surface of the valve body 2 or the maximum diameter of the bush 3 is equal to the maximum outer diameter of the valve rubber 2; the shape of the base 4 comprises 2 types, which are respectively a round table structure or a T-shaped structure; the structure of the second through hole in the base 4 comprises 2 types, namely a second circular truncated cone through hole 7-a bush embedding hole 8-a second cylinder through hole 9 or a bush embedding hole 8-a second cylinder through hole 9. The shape of the bush insertion hole 8 needs to be matched with the shape of the bush 3; when the maximum diameter of the bush 3 is equal to the maximum diameter of the working surface of the valve body 1, the structure of the second through hole in the base 4 matched with the bush 3 needs to be the second circular truncated cone through hole 7-the bush inserting hole 8-the second cylinder through hole 9, and when the maximum diameter of the bush 3 is equal to the maximum outer diameter of the valve rubber 2, the structure of the second through hole in the base 4 matched with the bush 3 needs to be the bush inserting hole 8-the second cylinder through hole 9. In addition to the structural characteristics needing to be fixedly matched, other structural characteristics can be freely combined according to actual requirements. Only the combination of 3 is listed below.
Example 1
As shown in fig. 1, the long-life split valve seat comprises a bushing 3 and a base 4, wherein the bushing 3 is embedded in an outlet end of the base 4, the bushing 3 is matched with the valve body 1 for use, and the bushing 3 is made of tungsten carbide alloy. Further preferably, the tungsten carbide alloy comprises nickel-based tungsten carbide or cobalt-based tungsten carbide. The bush 3 is the cylinder structure, base 4 is T type structure, base 4 includes cylinder head and round platform afterbody that from the top down connects gradually, the last bottom surface diameter of round platform afterbody is greater than bottom surface diameter down. The diameter of the head of the cylinder is larger than that of the upper bottom surface of the tail of the circular truncated cone. A first through hole is formed in the bushing 3 and comprises a first circular truncated cone through hole 5 and a first cylindrical through hole 6 which are sequentially communicated from top to bottom, and the diameter of the upper bottom surface of the first circular truncated cone through hole 5 is larger than that of the lower bottom surface. The diameter of the lower bottom surface of the first circular truncated cone through hole 5 is the same as that of the first cylinder through hole 6. The bushing 3 is assembled with the base 4 by adopting a temperature difference method. The diameter of the upper bottom surface of the first circular truncated cone through hole 5 of the bushing 3 is the same as the maximum diameter of the working surface of the valve body 1. The base 4 is provided with a second through hole, the second through hole comprises a second round platform through hole 7, a bush embedding hole 8 and a second cylindrical through hole 9 which are sequentially communicated from top to bottom, the bush embedding hole 8 is a cylindrical hole, and the diameter of the upper bottom surface of the second round platform through hole 7 is larger than that of the lower bottom surface. The diameter of the bush embedding hole 8 is larger than that of the second cylinder through hole 9, when the bush 3 is embedded in the base 4, the conical surface of the second circular truncated cone through hole 7 is flush with that of the first circular truncated cone through hole 5, and the side surface of the first cylinder through hole 5 is flush with that of the second cylinder through hole 7.
Example 2
As shown in fig. 2, a split valve seat with a long service life is different from embodiment 1 in that the bushing 3 is in a circular truncated cone structure, and the diameter of the upper bottom surface of the first circular truncated cone through hole 5 of the bushing 3 is the same as the maximum outer diameter of the valve rubber 2. The bush 3 is assembled with the base 4 by adopting a press-in method. The second through hole comprises a bush inserting hole 8 and a second cylinder through hole 9 which are communicated from top to bottom in sequence, the bush inserting hole 8 is in a circular truncated cone shape, and the diameter of the upper bottom surface of the bush inserting hole 8 is larger than that of the lower bottom surface. The diameter of the lower bottom surface of the bush-insertion hole 8 is larger than the diameter of the second cylinder through hole 9. The base 4 is further provided with an annular groove 10 on a table top formed by the bush embedding hole 8 and the second cylinder through hole 9, and an O-shaped ring 11 is arranged in the annular groove 10.
Example 3
As shown in fig. 3, a long-life split valve seat is different from the embodiment 1 in that the base 4 has a circular truncated cone structure, and the diameter of the upper bottom surface of the base is larger than that of the lower bottom surface.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (9)

1. The utility model provides a split type valve seat of long-life which characterized in that: the valve bush is characterized by comprising a bush and a base, wherein the bush is embedded into an outlet end of the base, the bush is matched with a valve body for use, and the bush is made of tungsten carbide alloy.
2. The long life split valve seat of claim 1, wherein: the tungsten carbide alloy comprises nickel-based tungsten carbide or cobalt-based tungsten carbide.
3. The long life split valve seat of claim 1 or 2, wherein: the bushing is of a cylinder structure or a circular truncated cone structure, when the bushing is of the circular truncated cone structure, the diameter of the upper bottom surface of the bushing is larger than that of the lower bottom surface of the bushing, a first through hole is formed in the bushing and comprises a first circular truncated cone through hole and a first cylinder through hole which are sequentially communicated from top to bottom, the diameter of the upper bottom surface of the first circular truncated cone through hole is larger than that of the lower bottom surface of the first circular truncated cone through hole, and the diameter of the lower bottom surface of the first circular truncated cone through hole is the same as that of the first cylinder.
4. The long life split valve seat of claim 3, wherein: when the bushing is in a circular truncated cone structure, the taper of the bushing is 1:8-1: 16.
5. The long life split valve seat of claim 3, wherein: the contact surface of the valve body and the bushing is a valve body working surface, and the diameter of the upper bottom surface of the first circular truncated cone through hole is the same as the maximum diameter of the valve body working surface or the maximum outer diameter of the valve rubber.
6. The long life split valve seat of claim 5, wherein: the base is round platform type structure or T type structure, and when being round platform type structure, the last bottom surface diameter of base is greater than bottom surface diameter down, when being T type structure, the base includes cylinder head and the round platform afterbody that from the top down connects in proper order, the last bottom surface diameter of round platform afterbody is greater than bottom surface diameter down, the diameter of cylinder head is greater than the last bottom surface diameter of round platform afterbody.
7. The long life split valve seat of claim 6, wherein: the base is provided with a second through hole, the second through hole comprises a second round platform through hole, a bushing embedding hole and a second cylinder through hole which are sequentially communicated from top to bottom, the diameter of the upper bottom surface of the second round platform through hole is larger than that of the lower bottom surface, the minimum diameter of the bushing embedding hole is larger than that of the second cylinder through hole, when the bushing is embedded in the base, the conical surface of the second round platform through hole is flush with that of the first round platform through hole, and the side surface of the first cylinder through hole is flush with that of the second cylinder through hole.
8. The long life split valve seat of claim 6, wherein: the base is provided with a second through hole, the second through hole comprises a bush embedding hole and a second cylinder through hole which are sequentially communicated from top to bottom, the minimum diameter of the bush embedding hole is larger than that of the second cylinder through hole, and when the bush is embedded in the base, the side face of the first cylinder through hole is flush with the side face of the second cylinder through hole.
9. The long life split valve seat of claim 7 or 8, wherein: the base is further provided with an annular groove on a table top formed by the bushing embedding hole and the second cylindrical through hole, and an O-shaped ring is arranged in the annular groove.
CN202010607089.3A 2020-06-30 2020-06-30 Long-life split type valve seat Pending CN111664087A (en)

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