CN111734840B - Fixed ball valve with spare wheel valve seat - Google Patents
Fixed ball valve with spare wheel valve seat Download PDFInfo
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- CN111734840B CN111734840B CN202010641113.5A CN202010641113A CN111734840B CN 111734840 B CN111734840 B CN 111734840B CN 202010641113 A CN202010641113 A CN 202010641113A CN 111734840 B CN111734840 B CN 111734840B
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- spare tire
- tire valve
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- pressure
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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
- 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
- F16K5/06—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 spherical surfaces; Packings therefor
- F16K5/0663—Packings
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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
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/06—Construction of housing; Use of materials therefor of taps or cocks
- F16K27/067—Construction of housing; Use of materials therefor of taps or cocks with spherical plugs
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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
- 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)
- Taps Or Cocks (AREA)
- Check Valves (AREA)
Abstract
The invention relates to a fixed ball valve with a spare wheel valve seat, and belongs to the technical field of ball valve manufacturing. The invention provides a spare tire valve seat for the main valve seat on each side of the ball body, so that each side valve seat has redundancy capability, and the valve seat sealing performance of the valve has longer service life. After the spare tire valve seat is started, before the valve is switched on and off each time, the air cylinder pressure of the driving device is firstly released to the atmosphere through the pressure relief opening needle valve, and then the spare tire valve seat is pushed away from the ball body under the pressure of the medium in the valve cavity. Therefore, in the process of opening and closing the operation valve, the ball body cannot generate abrasion effect on the sealing material of the spare tire valve seat; meanwhile, the spare tire valve seat can not generate frictional resistance on the ball, so that the operating torque of the valve is greatly reduced. Meanwhile, the built-in air-liquid linkage driving device has a compact structure, and can realize the sealing effect of the spare tire valve seat under the condition of not using an external air source.
Description
Technical Field
The invention relates to a fixed ball valve with a spare wheel valve seat, and belongs to the technical field of ball valve manufacturing.
Background
In the natural gas pipeline project, valves are required to have the same design life as the pipeline (generally over 30 years), especially for all-welded fixed ball valves which are welded to the pipeline and buried underground along with the pipeline. However, the valve seat sealing material required under this condition is often plastic or rubber. According to the quantity of valve seats, the existing fixed ball valve has the following two forms:
a first valve having a valve seat on each of the upstream and downstream sides of the ball (see FIG. 1);
the second valve has two valve seats on the upstream side and the downstream side of the ball respectively (see figure 2).
For the two valves, the sealing principle of the valve seat is as follows: the valve seat is pushed to cling to the surface of the ball body to realize sealing by the medium pressure in the valve. Specifically, the method comprises the following steps: no matter the valve is in the open position or the closed position, as long as the medium pressure exists in the valve, the valve seats on the two sides of the ball body are always tightly attached to the surface of the ball body.
For the first valve and the second valve, the thrust generated by the medium pressure on the valve seat exists in each valve opening and closing process (note: the thrust exists all the time as long as the sealing performance of the valve seat sealing material is intact, and the thrust disappears when the valve seat sealing material leaks due to excessive abrasion, which is also a main reason for the leakage of the valve seal), and the thrust acts on the ball to generate frictional resistance to hinder the operation of the valve, so that the abrasion effect on the valve seat sealing material can be generated in each operation of the valve. Therefore, the valve seat seal life of the first valve and the valve seat seal life of the second valve with the same specification are not different. Compared with the first valve, the sealing performance of the second valve is better than that of the first valve because each side of the second valve is provided with two valve seats for sealing at the same time; however, this also results in the frictional resistance of the valve seat of the second valve to the ball being much greater than that of the first valve, so that the operating torque of the second valve is much greater than that of the first valve, that is: the cost of the actuator required to operate the second valve is much greater than the cost of the actuator required to operate the first valve. Therefore, it is important to provide a valve seat seal having a long life without increasing the cost of the valve actuator.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: a stationary ball valve having a spare tire seat is provided such that the stationary ball valve has a longer service life and the operating torque of the valve is substantially reduced after the spare tire seat is deployed.
In order to solve the technical problems, the invention adopts the technical scheme that: the fixed ball valve with the spare tire valve seat comprises a ball body and a valve body, wherein the valve body is provided with a mounting cavity matched with the ball body, the mounting cavity is respectively provided with a main valve seat on the upstream side and the downstream side of the ball body, the valve body is provided with the spare tire valve seat on the upstream side or the downstream side of the ball body, or the spare tire valve seat is respectively arranged on the upstream side and the downstream side of the ball body; it is preferable that spare tire seats are disposed on the upstream side and the downstream side of the ball, respectively.
The spare tire valve seat on the upstream side and the spare tire valve seat on the downstream side have the same mounting structure, and the mounting structure is as follows: taking the center line of a flow passage of the valve body as a reference object, wherein a spare tire valve seat annular mounting groove is formed in the outer side of the main valve seat of the valve body, and the spare tire valve seat is slidably mounted in the spare tire valve seat annular mounting groove; sealing structures are formed between the inner circular surface of the spare tire valve seat and the side wall of the spare tire valve seat annular mounting groove and between the outer circular surface of the spare tire valve seat and the side wall of the spare tire valve seat annular mounting groove, the end face, away from one end of the ball body, of the spare tire valve seat and the spare tire valve seat annular mounting groove are combined to form a pressure cavity, the pressure cavity is provided with a pressure adjusting structure, and the pressure adjusting structure enables the spare tire valve seat to have a first state which is not in contact with the ball body and a second state which is in contact with the ball body to form the sealing structures.
Further, the method comprises the following steps: the pressure adjusting structure comprises a piston cylinder arranged on the valve body, the piston cylinder and the valve body are of an integrated structure, the inner end of the piston cylinder is communicated with a pressure cavity at the tail end of the spare tire valve seat through a connecting hole, and the outer end of the piston cylinder is sealed through a gland; the end of the piston cylinder close to the gland is provided with a stepped hole with a large outer end and a small inner end, the stepped hole is provided with a stepped piston shaft, and a sealing structure is respectively formed between the excircle of the large end of the piston shaft and the inner wall of the large end piston hole of the stepped hole and between the excircle of the small end of the piston shaft and the inner wall of the small end piston hole of the stepped hole;
the inner cavity of the piston cylinder on one side of the end face of the small end of the piston shaft, the pressure cavity at the tail end of the spare tire valve seat and the connecting hole between the piston cylinder and the pressure cavity form a hydraulic driving cavity, and the hydraulic driving cavity is filled with hydraulic oil;
the inner cavity of the piston cylinder on one side of the large end of the piston shaft is an external driving cavity, a pressure inlet and a pressure relief opening are formed in the gland, the pressure inlet is provided with a pressure inlet needle valve for controlling the opening and closing of the pressure inlet, the pressure relief opening is provided with a pressure relief opening needle valve for controlling the opening and closing of the pressure relief opening, and the pressure inlet is communicated with a flow passage in the valve body through a pressure guiding pipe;
for the spare tire valve seat on the upstream side, the pressure guiding pipe corresponding to the upstream side is communicated with an upstream flow passage in the valve body;
and for the spare tire valve seat on the downstream side, the pressure guide pipe corresponding to the spare tire valve seat on the downstream side is communicated with the downstream flow passage in the valve body.
The fixed ball valve is generally applied to natural gas pipelines, the inner cavity of the piston cylinder on one side of the large end of the piston shaft is an air cylinder structure, and the pressure adjusting structure of the spare tire valve seat can be summarized into a built-in air-liquid linkage driving device, so that the sealing effect of the spare tire valve seat can be realized under the condition of not using an external air source.
Further, the method comprises the following steps: the inner wall of the large-end piston hole of the stepped hole is provided with a breathing hole communicated with the atmosphere at a position close to the orifice of the small-end piston hole.
Further, the method comprises the following steps: the inner wall of the large-end piston hole of the stepped hole is provided with a limiting block used for limiting the stroke of the piston shaft on the large end side of the piston shaft, the limiting block is connected with the valve body through a four-open ring pressed below the end cover, and the center of the limiting block is provided with a through hole with local threads.
Further, the method comprises the following steps: the gland is connected with the valve body through a bolt, and an O-shaped ring is arranged at one end, extending into the valve body, of the gland for sealing.
Further, the method comprises the following steps: o-shaped rings are respectively arranged between the excircle of the large end of the piston shaft and the inner wall of the large end piston hole of the stepped hole, and between the excircle of the small end of the piston shaft and the inner wall of the small end piston hole of the stepped hole.
Further, the method comprises the following steps: the outer circle radius of the large end of the piston shaft is set to r d The outer circle radius of the small end of the piston shaft is set to r x According to the formula
And calculating to obtain a supercharging coefficient K of the pressure regulating structure, wherein the value of the supercharging coefficient K is set to be 1.5-2.5.
Further, the method comprises the following steps: the section of one end of the spare tire valve seat far away from the ball body is circular, and the radius of the outer ring of the spare tire valve seat is set to be R 1 The radius of the inner ring is set to R 2 The stroke of the piston shaft is set to L, and the outer circle radius of the small end of the piston shaft is set to r x The moving stroke of the spare tire valve seat is set as x, and the x is calculated according to the following formula:
further, the method comprises the following steps: the section of the annular mounting groove of the spare tire valve seat is circular, and the radius of the outer ring of the annular mounting groove is set to be R 1 The radius of the inner ring is set to R 2 The stroke of the piston shaft is set to L, and the radius of the small-end piston hole of the stepped hole is set to r x The moving stroke of the spare tire valve seat is set as x, and the x is calculated according to the following formula:
further, the method comprises the following steps: the spare tire valve seat comprises a metal circular ring and a valve seat sealing ring; the valve seat sealing ring is made of plastic or rubber;
an outer O-shaped ring is arranged on the outer cylindrical surface of the metal circular ring, and an inner O-shaped ring is arranged on the inner cylindrical surface of the metal circular ring;
the metal ring is provided with a conical surface matched with the ball body on one side facing the ball body, and the valve seat sealing ring is assembled on the conical surface.
Further, the method comprises the following steps: the outer cylindrical surface of the metal ring is provided with two outer side O-shaped rings, and an annular groove is formed in the position, between the two outer side O-shaped rings, of the outer cylindrical surface of the metal ring; a plurality of through holes communicated to the inner cylindrical surface of the metal circular ring are arranged at intervals on the bottom surface of the annular groove; the valve body is provided with a passage for injecting sealing grease to the annular groove and the plurality of through holes.
The invention has the beneficial effects that: a spare tire valve seat is arranged on each side of the ball body of the main valve seat, so that each side of the valve seat has redundancy capability, and the valve seat sealing performance of the valve has longer service life. This redundancy capability is manifested as: (1) when the valve does not leak, the spare tire valve seats and the ball body are not in contact, the spare tire valve seats do not intervene in sealing work at the moment, and the abrasion effect of the ball body on the sealing material of the spare tire valve seats is avoided; (2) when irreparable leakage occurs between the upstream main valve seat and the downstream main valve seat of the valve, the built-in air-liquid linkage driving device on the upstream side of the valve is started to drive the spare tire valve seat on the upstream side to be tightly attached to the ball body to realize sealing. (3) When the upstream spare tire valve seat leaks, the sealing performance of the sealing grease injected by the external grease injection valve can be repaired by utilizing the annular groove and the through holes arranged on the upstream spare tire valve seat. (4) When the upstream spare tire valve seat has irreparable leakage, the built-in air-liquid linkage driving device at the downstream side of the valve is started again to drive the downstream side spare tire valve seat to be tightly attached to the ball body so as to realize resealing. (5) When the downstream spare tire valve seat leaks, the sealing performance of the sealing grease injected by the external grease injection valve can be repaired by utilizing the annular groove and the through holes which are arranged on the downstream spare tire valve seat. The redundant capacity of valve seat sealing performance can be greatly improved by the measures.
After the spare tire valve seat is started, before the valve is switched on and off each time, the air cylinder pressure of the driving device is firstly released to the atmosphere through the pressure relief opening needle valve, and then the spare tire valve seat is pushed away from the ball body under the pressure of the medium in the valve cavity. Therefore, in the process of opening and closing the operation valve, the ball body cannot generate abrasion effect on the sealing material of the spare tire valve seat; meanwhile, the spare tire valve seat can not generate frictional resistance on the ball, so that the operating torque of the valve is greatly reduced. After the valve is switched on and off, the pressure relief port needle valve is closed, and the pressure inlet needle valve is opened, so that a medium in a valve flow passage enters the cylinder, and a spare tire valve seat is driven to be tightly attached to the ball body to realize sealing. When the sealing is in place, the needle valve of the pressure inlet can be closed finally, so that the driving device is in a pressure maintaining state.
According to the working mode, the service life of the valve is greatly prolonged, and the operation torque of the valve is greatly reduced after the spare tire valve seat is started; meanwhile, the built-in air-liquid linkage driving device has a compact structure, and can realize the sealing effect of the spare tire valve seat under the condition of not using an external air source.
Drawings
FIG. 1 is a schematic view of a valve seat structure of a first prior art valve (a valve seat is arranged on each of the upstream side and the downstream side of a ball);
FIG. 2 is a schematic view of a valve seat structure of a second conventional valve (two valve seats are provided on the upstream side and the downstream side of a ball);
FIG. 3 is a schematic view of the overall structure of the valve of the present invention;
FIG. 4 is a partial enlarged view of FIG. 3 at A;
FIG. 5 is a schematic view of a spare tire valve seat according to the present invention;
FIG. 6 is a schematic view of the internal air-liquid linkage drive of the present invention (not activated);
fig. 7 is a schematic view of the built-in air-liquid linkage drive device (activated state) of the present invention.
Labeled as: the pneumatic tire valve comprises a main valve seat 1, a spare tire valve seat 2, a metal ring 21, a valve seat sealing ring 22, an outer O-shaped ring 23, an inner O-shaped ring 24, a conical surface 25, an annular groove 26, a through hole 27, a built-in pneumatic-hydraulic linkage driving device 3, a piston shaft 31, a limiting block 32, a four-open ring 33, an end cover 34, a gland 35, a pressure relief opening needle valve 36, a pressure inlet needle valve 37, a spare tire valve seat annular mounting groove 38, a breathing hole 39, a ball body 4, a valve body 5 and a pressure guiding pipe 6.
Detailed Description
For the purpose of promoting an understanding and an enabling description of the invention, reference should be made to the following detailed description of the preferred embodiments taken in conjunction with the accompanying drawings.
As shown in fig. 3 to 7, the present invention includes a ball 4 and a valve body 5, the valve body 5 has a mounting cavity adapted to the ball 4, the mounting cavity has a main valve seat 1 respectively disposed on the upstream side and the downstream side of the ball 4, the main valve seat 1 can be implemented according to the conventional technology, the outer circle of the main valve seat 1 generally adopts a step surface structure, and an O-ring is disposed on the outer circle surface, a valve seat sealing ring is disposed on one end of the main valve seat 1 facing the ball 4, and an adjusting spring is disposed between one end of the main valve seat 1 facing away from the ball 4 and the valve body 5, when implemented, the main valve seat 1 is pushed to cling to the surface of the ball 4 by medium pressure inside the valve to realize sealing. The valve body 5 in the present invention is arranged with the spare tire valve seat 2 on the upstream side or the downstream side of the sphere 4, or arranged with the spare tire valve seat 2 on the upstream side and the downstream side of the sphere 4, respectively; it is preferable that the spare tire valve seats 2 are arranged on the upstream side and the downstream side of the ball 4, respectively.
The spare tire valve seat 2 on the upstream side and the spare tire valve seat 2 on the downstream side have the same mounting structure: taking the center line of a flow channel of the valve body 5 as a reference object, wherein the valve body 5 is provided with a spare tire valve seat annular installation groove 38 at the outer side of the main valve seat 1, and the spare tire valve seat 2 is slidably installed in the spare tire valve seat annular installation groove 38; sealing structures are formed between the inner circular surface of the spare tire valve seat 2 and the side wall of the spare tire valve seat annular mounting groove 38 and between the outer circular surface of the spare tire valve seat 2 and the side wall of the spare tire valve seat annular mounting groove 38, the end surface of one end, far away from the ball 4, of the spare tire valve seat 2 and the spare tire valve seat annular mounting groove 38 are combined to form a pressure cavity, and the pressure cavity is provided with a pressure adjusting structure, so that the spare tire valve seat 2 has a first state of being not in contact with the ball 4 and a second state of being in contact with the ball 4 to form the sealing structures. The pressure adjusting structure can be realized by hydraulic drive, pneumatic drive, gas-liquid linkage drive and the like.
In order to facilitate the implementation, the invention particularly provides a gas-liquid linkage driving mode, which has the following specific structure: the pressure adjusting structure comprises a piston cylinder arranged on the valve body 5, the piston cylinder and the valve body 5 are of an integrated structure, the inner end of the piston cylinder is communicated with a pressure cavity at the tail end of the spare tire valve seat 2 through a connecting hole, and the outer end of the piston cylinder is sealed through a gland 35; the end of the piston cylinder close to the gland 35 is provided with a step hole with a large outer end and a small inner end, the step hole is provided with a step-shaped piston shaft 31, and sealing structures are respectively formed between the excircle of the large end of the piston shaft 31 and the inner wall of the large end piston hole of the step hole and between the excircle of the small end of the piston shaft 31 and the inner wall of the small end piston hole of the step hole; the inner cavity of the piston cylinder on one side of the end face of the small end of the piston shaft 31, the pressure cavity at the tail end of the spare tire valve seat 2 and the connecting hole between the two are combined to form a hydraulic driving cavity, and the hydraulic driving cavity is filled with hydraulic oil; the inner cavity of the piston cylinder on one side of the large end of the piston shaft 31 is an external driving cavity, a pressure inlet and a pressure relief opening are formed in the gland 35, the pressure inlet is provided with a pressure inlet needle valve 37 for controlling the opening and closing of the pressure inlet, the pressure relief opening is provided with a pressure relief opening needle valve 38 for controlling the opening and closing of the pressure relief opening, and the pressure inlet is communicated with a flow passage in the valve body 5 through a pressure guiding pipe 6; for the spare tire valve seat 2 on the upstream side, the pressure guiding pipe 6 corresponding to the upstream side is communicated with an upstream flow passage in the valve body 5; for the spare tire valve seat 2 on the downstream side, the pressure introduction pipe 6 corresponding to that side communicates with the downstream flow passage inside the valve body 5. The fixed ball valve is generally applied to natural gas pipelines, the inner cavity of the piston cylinder at one side of the large end of the piston shaft 31 is a cylinder structure, the pressure adjusting structure of the spare tire valve seat 2 can be summarized into a built-in air-liquid linkage driving device 3, and the sealing effect of the spare tire valve seat 2 can be realized under the condition of not using an external air source. The valve of the invention is provided with a spare tire valve seat 2 for an upstream main valve seat 1 and a downstream main valve seat 1 respectively; and each spare tire valve seat 2 is provided with a built-in pneumatic-hydraulic linkage driving device 3 for driving the corresponding spare tire valve seat 2 to fulfill the sealing requirement of the valve when the two main valve seats 1 have irreparable leakage.
The inner wall of the large-end piston hole of the stepped hole is provided with a breathing hole 39 which is communicated with the atmosphere at the position close to the orifice of the small-end piston. The breather 39 is used to vent air from the large end piston bore during piston movement, allowing the piston shaft 31 to complete the designed stroke movement.
In order to facilitate assembly and control of the stroke of the piston shaft 31, the inner wall of the large-end piston hole of the stepped hole is provided with a limiting block 32 for limiting the stroke of the piston shaft 31 at the large end side of the piston shaft 31, the limiting block 32 is connected with the valve body 5 through a four-open ring 33 pressed below an end cover 34, and the center of the limiting block 32 is provided with a through hole with local threads. For the assembly, effectively guarantee sealed effect simultaneously, gland 35 is connected with valve body 5 through the bolt, and the one end that gland 35 stretches into valve body 5 is provided with O shape circle and seals. In order to facilitate assembly and effectively ensure the sealing effect, O-shaped rings are respectively arranged between the excircle of the large end of the piston shaft 31 and the inner wall of the large end piston hole of the stepped hole and between the excircle of the small end of the piston shaft 31 and the inner wall of the small end piston hole of the stepped hole.
In order to make the structure simple and reliable, the spare tire valve seat 2 comprises a metal ring 21 and a valve seat sealing ring 22; the valve seat sealing ring 22 is made of plastic or rubber; an outer O-shaped ring 23 is arranged on the outer cylindrical surface of the metal ring 21, and an inner O-shaped ring 24 is arranged on the inner cylindrical surface of the metal ring 21; the metal ring 21 is provided on the side facing the ball 4 with a conical surface 25 adapted to the ball 4, the seat seal 22 being fitted on the conical surface 25.
When the invention is implemented, when the sealing performance of one of the two main valve seats 1 of the valve is good, the spare tire valve seat 2 is pushed away from the ball 4 under the action of the pressure in the valve cavity without sealing. At this time, the pressure inlet needle valve 37 of the built-in air-hydraulic linkage driving device 3 is in a closed state, and the pressure outlet needle valve 36 is in an open state, that is, the cylinder pressure on the large end side of the piston shaft 31 of the built-in air-hydraulic linkage driving device 3 is at the atmospheric pressure.
When the two main valve seats 1 of the valve have irreparable leakage, the spare tire valve seat 2 can be tightly attached to the ball 4 to realize sealing under the pushing of the built-in gas-liquid linkage driving device 3. At this time, the pressure inlet needle valve 37 of the built-in air-liquid linkage driving device 3 is in an open state, and the pressure outlet needle valve 36 is in a closed state, that is, the cylinder pressure on the large end side of the piston shaft 31 of the built-in air-liquid linkage driving device 3 is equal to the medium pressure in the valve flow passage.
The most key technical points are as follows: under the condition that a spare tire valve seat 2 is used, before the valve is opened or closed each time, a corresponding built-in air-liquid linkage driving device 3 is controlled to enable the spare tire valve seat 2 to be separated from contact with a ball 4, then the valve is opened or closed, and the purposes that a plastic or rubber valve seat sealing ring 22 of the spare tire valve seat 2 has no abrasion effect and the valve operation torque is greatly reduced are achieved. Specifically, the method comprises the following steps: controlling the pressure inlet needle valve 37 to be in a closed state so as to cut off the medium pressure in the valve flow passage from entering the cylinder; meanwhile, the needle valve 36 of the pressure relief port is controlled to be in an open state to relieve the pressure in the cylinder to atmospheric pressure, and the spare tire valve seat 2 is pushed away from the ball 4 under the action of the pressure in the valve cavity. Therefore, the valve seat sealing ring 22 made of plastic or rubber of the spare tire valve seat 2 is not worn during the valve opening and closing operation, thereby prolonging the service life of the sealing performance.
The opening and closing of the pressure inlet needle valve 37 and the pressure outlet needle valve 36 may be manually controlled by a handle or electrically controlled. When the valve has a remote control requirement, only the pressure relief port needle valve 36 and the pressure inlet needle valve 37 need to be designed into electric needle valves; the method and principles of remotely controlling the valve are consistent with the above discussion.
The outer diameter of the large end of the piston shaft 31 is set to r d The outer diameter of the small end of the piston shaft 31 is set to r x According to the formula
And calculating to obtain a supercharging coefficient K of the pressure regulating structure, wherein the value of the supercharging coefficient K is set to be 1.5-2.5. The research shows that: the design value of the supercharging coefficient is 1.5-2.And 5, the spare tire valve seat 2 can obtain good sealing performance and reverse push-off performance.
In order to obtain good sealing performance and reverse pushing-away performance of the spare tire valve seat 2, the moving stroke of the spare tire valve seat 2 can be designed as follows: the section of one end of the spare tire valve seat 2 far away from the ball body 4 is circular, and the radius of the outer ring is set to be R 1 The radius of the inner ring is set to R 2 The stroke of the piston shaft 31 is set to L, and the outer diameter of the small end of the piston shaft 31 is set to r x The moving stroke of the spare tire valve seat 2 is set as x, and x is calculated according to the following formula:
the design principle is as follows: due to the incompressibility of the hydraulic oil, the moving volume of the small end of the piston shaft 31 in the hydraulic oil is equal to the moving volume of the spare tire valve seat 2, that is to say: the moving volume of the small end of the piston shaft 31 in the hydraulic oil is divided by the sectional area of the metal ring of the spare tire valve seat 2 to be equal to the design stroke of the spare tire valve seat 2.
In addition, the invention is provided with two outer side O-shaped rings 23 on the outer cylindrical surface of the metal ring 21, and the outer cylindrical surface of the metal ring 21 is provided with an annular groove 26 between the two outer side O-shaped rings 23; a plurality of through holes 27 communicated to the inner cylindrical surface of the metal ring 21 are arranged at intervals on the bottom surface of the annular groove 26; the valve body 5 is provided with a passage for injecting sealing grease to the above-mentioned annular groove 26 and the several through holes 27. When the spare tire valve seat 2 leaks, the sealing performance can be restored by injecting sealing grease through the external grease injection valve by utilizing the annular groove 26 and the plurality of through holes 27 arranged on the spare tire valve seat 2.
Claims (8)
1. Fixed ball valve with spare tyre disk seat, including spheroid (4) and valve body (5), valve body (5) have with the installation cavity of spheroid (4) looks adaptation, this installation cavity respectively has arranged one main valve seat (1) in the upstream side and the downstream side of spheroid (4), its characterized in that: the valve body (5) is provided with a spare tire valve seat (2) on the upstream side or the downstream side of the ball (4), or provided with the spare tire valve seat (2) on the upstream side and the downstream side of the ball (4) respectively;
the spare tire valve seat (2) on the upstream side and the spare tire valve seat (2) on the downstream side have the same mounting structure which is that: taking the center line of a flow passage of the valve body (5) as a reference object, wherein the valve body (5) is provided with a spare tire valve seat annular installation groove (38) at the outer side of the main valve seat (1), and the spare tire valve seat (2) is installed in the spare tire valve seat annular installation groove (38) in a sliding manner; sealing structures are formed between the inner circular surface of the spare tire valve seat (2) and the side wall of the spare tire valve seat annular mounting groove (38) and between the outer circular surface of the spare tire valve seat (2) and the side wall of the spare tire valve seat annular mounting groove (38), the end surface of one end, away from the ball body (4), of the spare tire valve seat (2) and the spare tire valve seat annular mounting groove (38) are combined to form a pressure cavity, the pressure cavity is provided with a pressure adjusting structure, and the pressure adjusting structure enables the spare tire valve seat (2) to have a first state of being not in contact with the ball body (4) and a second state of being in contact with the ball body (4) to form a sealing structure;
the pressure adjusting structure comprises a piston cylinder arranged on the valve body (5), the piston cylinder and the valve body (5) are of an integrated structure, the inner end of the piston cylinder is communicated with a pressure cavity at the tail end of the spare tire valve seat (2) through a connecting hole, and the outer end of the piston cylinder is sealed through a gland (35); the end, close to the gland (35), of the piston cylinder is provided with a stepped hole with a large outer end and a small inner end, the stepped hole is provided with a stepped piston shaft (31), and sealing structures are respectively formed between the excircle of the large end of the piston shaft (31) and the inner wall of the large end piston hole of the stepped hole and between the excircle of the small end of the piston shaft (31) and the inner wall of the small end piston hole of the stepped hole; a breathing hole (39) which is communicated with the atmosphere is arranged on the inner wall of the large-end piston hole of the stepped hole at the position close to the orifice of the small-end piston;
the inner cavity of a piston cylinder on one side of the end face of the small end of the piston shaft (31), the pressure cavity at the tail end of the spare tire valve seat (2) and a connecting hole between the piston cylinder and the pressure cavity form a hydraulic driving cavity, and the hydraulic driving cavity is filled with hydraulic oil;
the inner cavity of a piston cylinder on one side of the large end of the piston shaft (31) is an external driving cavity, a pressure inlet and a pressure relief opening are formed in the gland (35), the pressure inlet is provided with a pressure inlet needle valve (37) used for controlling the opening and closing of the pressure inlet, the pressure relief opening is provided with a pressure relief opening needle valve used for controlling the opening and closing of the pressure relief opening, and the pressure inlet is communicated with a flow passage in the valve body (5) through a pressure guiding pipe (6);
for the spare tire valve seat (2) on the upstream side, the pressure guide pipe (6) corresponding to the upstream side is communicated with an upstream flow passage in the valve body (5);
for the spare tire valve seat (2) on the downstream side, the pressure guide pipe (6) corresponding to the spare tire valve seat on the downstream side is communicated with a downstream flow passage in the valve body (5).
2. The fixed ball valve with the spare tire valve seat according to claim 1, wherein a stopper (32) for limiting the stroke of the piston shaft (31) is arranged on the large end side of the piston shaft (31) on the inner wall of the large end piston hole of the stepped hole, the stopper (32) is connected with the valve body (5) through a four-open ring (33) pressed below an end cover (34), and a through hole with partial threads is formed in the center of the stopper (32).
3. The fixed ball valve with a spare tire valve seat as claimed in claim 1, wherein the gland (35) is connected with the valve body (5) through a bolt, and an O-shaped ring is arranged at one end of the gland (35) extending into the valve body (5) for sealing.
4. The fixed ball valve with the spare tire valve seat according to claim 1, wherein O-shaped rings are respectively arranged between the outer circle of the large end of the piston shaft (31) and the inner wall of the large end piston hole of the stepped hole, and between the outer circle of the small end of the piston shaft (31) and the inner wall of the small end piston hole of the stepped hole.
5. The fixed ball valve with spare tire valve seat according to claim 1, wherein the outer radius of the large end of the piston shaft (31) is set to r d The outer diameter of the small end of the piston shaft (31) is set to r x According to the formula
And calculating to obtain a supercharging coefficient K of the pressure regulating structure, wherein the value of the supercharging coefficient K is set to be 1.5-2.5.
6. A fixed ball valve having a spare tire valve seat as claimed in claim 1, wherein: the section of one end of the spare tire valve seat (2) far away from the ball body (4) is circular, and the radius of the outer ring of the spare tire valve seat is set to be R 1 Inner ring radius settingIs R 2 The stroke of the piston shaft (31) is set to L, and the outer circle radius of the small end of the piston shaft (31) is set to r x The moving stroke of the spare tire valve seat (2) is set to be x, and the x is calculated according to the following formula:
7. a fixed ball valve with a spare tire valve seat as claimed in any one of claims 1 to 6, wherein: the spare tire valve seat (2) comprises a metal circular ring (21) and a valve seat sealing ring (22); the valve seat sealing ring (22) is made of plastic or rubber;
an outer O-shaped ring (23) is arranged on the outer cylindrical surface of the metal circular ring (21), and an inner O-shaped ring (24) is arranged on the inner cylindrical surface of the metal circular ring (21);
the metal ring (21) is provided with a conical surface (25) matched with the ball body (4) on one side facing the ball body (4), and the valve seat sealing ring (22) is assembled on the conical surface (25).
8. A fixed ball valve having a spare tire valve seat as claimed in claim 7, wherein: two outer side O-shaped rings (23) are arranged on the outer cylindrical surface of the metal circular ring (21), and an annular groove (26) is arranged between the two outer side O-shaped rings (23) on the outer cylindrical surface of the metal circular ring (21); a plurality of through holes (27) communicated to the inner cylindrical surface of the metal ring (21) are arranged at intervals on the bottom surface of the annular groove (26); the valve body (5) is provided with a passage for injecting sealing grease into the annular groove (26) and the plurality of through holes (27).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010641113.5A CN111734840B (en) | 2020-07-06 | 2020-07-06 | Fixed ball valve with spare wheel valve seat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010641113.5A CN111734840B (en) | 2020-07-06 | 2020-07-06 | Fixed ball valve with spare wheel valve seat |
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| Publication Number | Publication Date |
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| CN111734840A CN111734840A (en) | 2020-10-02 |
| CN111734840B true CN111734840B (en) | 2022-08-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010641113.5A Active CN111734840B (en) | 2020-07-06 | 2020-07-06 | Fixed ball valve with spare wheel valve seat |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113404876B (en) * | 2021-07-06 | 2022-06-21 | 希佛隆阀门集团有限公司 | Butterfly valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08145204A (en) * | 1994-11-28 | 1996-06-07 | Kobe Steel Ltd | Ball valve |
| CN102878316B (en) * | 2012-10-23 | 2014-03-12 | 浙江超达阀门股份有限公司 | Ball valve reliable in sealing and low in opening-closing torque |
| CN103557344A (en) * | 2013-11-19 | 2014-02-05 | 兰州理工大学 | Multiple-sealing full-welding pipeline ball valve |
| CN108036072A (en) * | 2017-10-25 | 2018-05-15 | 白龙山 | Pneumatic hydraulic seal wear-resistant ball valve |
| CN111156327A (en) * | 2019-12-18 | 2020-05-15 | 白龙山 | Pneumatic hydraulic bellows ring group type wear-resisting ball valve |
| CN110925455B (en) * | 2019-12-31 | 2021-08-13 | 常州市永邦塑业有限公司 | High low temperature self-adaptation's PEEK disk seat |
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