CN114838158B - Automatic switching method for sealing of ball valve seat - Google Patents

Automatic switching method for sealing of ball valve seat Download PDF

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Publication number
CN114838158B
CN114838158B CN202210777104.8A CN202210777104A CN114838158B CN 114838158 B CN114838158 B CN 114838158B CN 202210777104 A CN202210777104 A CN 202210777104A CN 114838158 B CN114838158 B CN 114838158B
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China
Prior art keywords
valve
sealing
valve seat
seal
ball
Prior art date
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CN202210777104.8A
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Chinese (zh)
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CN114838158A (en
Inventor
王启全
曾和友
张朝东
白开玉
姜涛
李俊霖
张海林
冯科
杨智
林长洪
曾品其
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.)
CHENGDU CHENGFENG VALVE CO LTD
CHENGDU CHENGGAO VALVE CO LTD
Chengfeng Flow Tech Group
Original Assignee
Chengdu Chengfeng Flow Tech Group Co ltd
CHENGDU CHENGFENG VALVE CO LTD
Chengdu Cheng Gao Valve Co ltd
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Application filed by Chengdu Chengfeng Flow Tech Group Co ltd, CHENGDU CHENGFENG VALVE CO LTD, Chengdu Cheng Gao Valve Co ltd filed Critical Chengdu Chengfeng Flow Tech Group Co ltd
Priority to CN202210777104.8A priority Critical patent/CN114838158B/en
Publication of CN114838158A publication Critical patent/CN114838158A/en
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Publication of CN114838158B publication Critical patent/CN114838158B/en
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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
    • F16K5/0605—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 with particular plug arrangements, e.g. particular shape or built-in means
    • 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
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
    • F16K31/041—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor for rotating valves
    • F16K31/042—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor for rotating valves with electric means, e.g. for controlling the motor or a clutch between the valve and the motor
    • 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
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
    • F16K31/05—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor specially adapted for operating hand-operated valves or for combined motor and hand operation
    • F16K31/055—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor specially adapted for operating hand-operated valves or for combined motor and hand operation for rotating valves
    • 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
    • F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
    • F16K37/0008—Mechanical means
    • 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
    • F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
    • F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
    • F16K37/0083—For recording or indicating the functioning of a valve in combination with test equipment by measuring valve parameters
    • 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
    • F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
    • F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
    • F16K37/0091—For recording or indicating the functioning of a valve in combination with test equipment by measuring fluid parameters
    • 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
    • F16K5/0647—Spindles or actuating means
    • 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
    • F16K5/0689—Packings between housing and plug
    • 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
    • F16K5/14—Special arrangements for separating the sealing faces or for pressing them together
    • F16K5/20—Special arrangements for separating the sealing faces or for pressing them together for plugs with spherical surfaces
    • F16K5/201—Special arrangements for separating the sealing faces or for pressing them together for plugs with spherical surfaces with the housing or parts of the housing mechanically pressing the seal against the plug
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
    • G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
    • G01M3/2876—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for valves

Abstract

The invention relates to an automatic switching method for sealing a valve seat of a ball valve, which mainly comprises the following steps: detecting the sealing performance of the ball valve before formal use; the sealing switching hole is rotated to the first side, the valve rod is driven by a hand wheel, and only the second valve seat assembly plays a sealing role; judging whether the second valve seat assembly really fails or not through the pressure sensor, if the second valve seat assembly is sealed and failed, giving a leakage alarm, controlling the electric driving device to drive the valve rod to rotate the sealing switching hole to the second side through the control module, and enabling the first valve seat assembly to play a sealing role; at the moment, the electric driving device limits the rotation range of the valve rod and ensures that the sealing switching hole does not rotate to the first side when the hand wheel rotates the valve rod; when the first seat assembly also fails, the control module issues a change seat seal alarm. The method can realize full-automatic switching of the two groups of sealing assemblies, can judge whether the sealing assemblies are really invalid or not, and adopts a limiting device or a motor to realize self-locking to avoid starting incorrect sealing assemblies during manual operation.

Description

Automatic switching method for sealing of ball valve seat
Technical Field
The invention relates to the technical field of valves, in particular to an automatic switching method for sealing a valve seat of a ball valve.
Background
In the ball valve applied to the liquid medium transmission part in the prior art, certain types of media are inflammable and explosive, and can be gasified when being heated or flashed, the volume of the media is rapidly expanded when being gasified, a closed valve cavity is arranged in the ball valve for conveying the fluids, the structural design is unreasonable, the overpressure of the valve cavity can be caused, so that the media are leaked, even the ball valve is cracked to cause accidents, the existing ball valve for conveying the media is sealed by a lip seal ring (Lipseal), the one-way sealing characteristic of the lip seal ring is relied on, and the pressure is relieved by the lip seal ring of an upstream valve seat assembly when the valve cavity is overpressurized.
Lip-shaped sealing ring: the spring energy storage sealing ring is also called a general plug ring because of its excellent performance, is widely applied to various fields like a plug and realizes the sealing function. The jacket of the lip-shaped sealing ring is made of PCTFE, PTFE or other high-performance polymers, the inner spring can be made of different materials to provide elasticity, even the inner spring is not needed, and the elasticity is provided by the jacket of the lip-shaped sealing ring; because the lip-shaped sealing ring has medium corrosion resistance and aging resistance, the lip-shaped sealing ring is generally applied to special working conditions such as strong corrosive media and the like, which can not be used by a rubber O-shaped ring in the valve industry.
Unidirectional sealing: the lip seal can only seal pressure from the direction of the opening.
Bidirectional sealing: two lip-shaped sealing rings are mounted in a back-to-back mode, the opening directions are opposite, or a double-piston lip-shaped sealing ring with two opposite openings is adopted, so that the pressure in the two opening directions can be sealed.
In order to satisfy the requirement that the upstream valve seat assembly and the downstream valve seat assembly can bear medium pressure from the upstream end and the downstream end, and the valve cavity must be decompressed; therefore, the existing partial ball valve structure is: the upstream valve seat assembly adopts a lip-shaped sealing ring to seal medium pressure from the upstream end, and when the valve cavity is over-pressurized, the medium pressure is released to the downstream end through the upstream lip-shaped sealing ring; the valve seat at the downstream end adopts a double-piston lip-shaped sealing ring or two lip-shaped sealing rings are arranged in a back direction to realize bidirectional sealing, and the medium pressure from the downstream end and the pressure from the valve cavity are sealed; the structure also has the flow direction requirement on the medium, the medium is required to flow from the upstream end to the downstream end and is initially sealed by the upstream end valve seat assembly, and the effect that the upstream valve seat assembly and the downstream valve seat assembly can be sealed can be achieved only by enabling the medium pressure to enter the valve cavity and pushing the downstream end valve seat assembly to be sealed under the condition that the upstream end valve seat assembly is sealed and failed; if the pressure of the medium flows reversely, the medium flows from the downstream end to the upstream end, the valve seat seal of the downstream end is pushed, but if the valve seat seal of the downstream end fails, the medium enters the valve cavity, and the upstream valve seat assembly only adopts a lip-shaped sealing ring to seal in a one-way mode and cannot seal the pressure from the valve cavity, so that the seal of the whole valve fails.
Because the existing partial ball valve has overpressure when the temperature rises or flash evaporation is carried out in the valve cavity, the lip-shaped sealing ring of the upstream valve seat assembly is deformed and then decompressed, the lip-shaped sealing ring is repeatedly pressed and easily deformed when the pressure is decompressed, and the lip-shaped sealing ring of the upstream valve seat assembly fails to seal; and the downstream valve seat can be damaged by the scouring of medium in the process of opening or closing the valve and cause sealing failure, and once the downstream valve seat fails in sealing, the upstream lip-shaped sealing ring cannot play a sealing role due to frequent pressure relief, and both the upstream valve seat assembly and the downstream valve seat assembly can fail in sealing, so that the service life of the whole valve is shortened. Moreover, because the downstream end valve seat adopts a double-piston lip-shaped sealing ring or two lip-shaped sealing rings are installed in a back direction, the parts of the upstream valve seat assembly and the downstream valve seat assembly are different and cannot be used commonly, and therefore the manufacturing and purchasing costs are increased.
Disclosure of Invention
The invention aims to provide an automatic switching method for ball valve seat sealing, which can realize full-automatic switching of two groups of valve seat sealing, can prevent incorrect sealing components from being started, and is reliable and efficient as a whole.
The invention provides an automatic switching method of a ball valve seat seal, the ball valve comprises a main valve body and a control module, a ball core is arranged in a main valve cavity of the main valve body, a first valve body and a second valve body are arranged on two sides of the main valve body, the first valve body is positioned on a first side, the second valve body is positioned on a second side, the valve seat seal comprises a first valve seat component and a second valve seat component, the first valve seat component is arranged in the first valve body, the second valve seat component is arranged in the second valve body, the first valve seat component is provided with a first valve seat support, a first lip-shaped sealing ring is arranged on the first side of the first valve seat support, a first valve seat is arranged on the second side of the second valve seat support, a second lip-shaped sealing ring is arranged on the second side of the second valve seat support, and the first valve seat and the second valve seat are in sealing contact with the ball core, one side of the ball core is provided with a sealing switching hole which is communicated with the ball core channel; a second side of the first valve seat support is provided with a pressure-bearing retainer ring, and the excircle of the pressure-bearing retainer ring is in sliding contact with the inner wall of the main valve cavity; the upper end of the ball core is connected with a valve rod, the valve rod is connected with an electric driving device, a sealing cavity is formed between the second side of the second lip-shaped sealing ring and the second valve body, and a pressure sensor for detecting the pressure of the sealing cavity is arranged on the second valve body; the control module controls the electric driving device to drive the valve rod to adjust the position of the sealing switching hole according to the signal of the pressure sensor.
The automatic switching method comprises the following steps:
the method comprises the following steps: before formal use, the sealing performance of the ball valve is detected, the pressure drop of the first side when the sealing switching hole is positioned at the first side is detected, and the pressure drop of the first side when the sealing switching hole is positioned at the second side is detected.
Step two: and the sealing switching hole is rotated to the first side, the electric driving device is disconnected from the valve rod, at the moment, the valve rod is driven by the hand wheel, the second valve seat assembly plays a role in sealing the ball valve, and the first valve seat assembly does not play a sealing role.
Step three: when the second valve seat component leaks, the pressure sensor detects the pressure of the sealing cavity, and whether the second valve seat component really fails or not is judged according to the detection signal.
Step four: when judging the second valve holder subassembly is for inefficacy, control module sends and reveals the alarm, simultaneously pressure sensor is with signal transmission to control module, control module control electricity drives the device and is connected with the valve rod transmission, drives the valve rod and drives the rotation of ball core until sealed switching hole towards the second side, first valve holder subassembly plays sealed effect.
Step five: when the first valve seat assembly works, the electric driving device limits the rotation angle of the valve rod, and the sealing switching hole is prevented from rotating to the first side when the valve rod is rotated by the hand wheel.
Step six: the control module issues a replacement seat seal alarm when the first seat assembly fails.
Preferably, in the third step, when the pressure sensor detects a discontinuous overpressure signal, it is determined that the second valve seat assembly does not really fail, and when the pressure sensor detects a continuous overpressure signal, it is determined that the second valve seat assembly fails to seal.
Preferably, the second valve seat assembly is determined to be sealed and failed when the pressure sensor detects an overpressure signal for more than 5 consecutive seconds.
Preferably, in the fifth step, the control module includes an angle detection device, the valve rod is arranged in the upper valve body, the angle detection device includes a plurality of sensing blocks arranged at equal intervals on the valve rod, and a sensing probe arranged on the inner wall of the upper valve body, the sensing probe sends a signal to the electric drive device when detecting that the rotation angle of the valve rod exceeds a preset angle, and the electric drive device limits the valve rod to continue rotating.
Preferably, in the fifth step, the electric drive device is connected with the valve rod all the time, works as when the inductive probe detects that the rotation angle of the valve rod exceeds 90 degrees, the electric drive device sends a signal to the electric drive device, and the electric drive device realizes the rotation of the limiting valve rod through the self-locking of the driving motor.
Preferably, in the fifth step, the electric driving device comprises a limiting device, and the limiting device is matched with a limiting baffle plate on the valve rod, so that the rotation range of the valve rod is limited within 0-95 degrees.
Preferably, the limiting device is a limiting rod, and the limiting rod extends out when the first valve seat assembly works and is matched with a limiting baffle on the valve rod.
Preferably, the pressure-bearing retaining ring is provided with a one-way drain hole, and the one-way drain hole realizes the conduction from the first side to the second side.
Preferably, in the sixth step, when the first valve seat assembly fails, the pressure medium enters the main valve cavity on the second side through the one-way drain hole, and the pressure sensor detects a pressure signal when the medium enters the seal cavity, and then the control module gives a leakage alarm.
Preferably, in the first step, the seal switching hole of the ball core is rotated to the first side, the pressure testing machine applies the testing fluid pressure from the first side of the ball valve, and whether leakage occurs or not is detected from the second side; subsequently, the ball core is rotated by 180 degrees, the seal switching hole of the ball core is positioned at the second side, the pressure tester applies test fluid pressure from the first side of the ball valve, and whether leakage occurs or not is detected from the second side.
Compared with the prior art, the invention has the following technical effects:
1. the ball valve used by the method of the invention is provided with two groups of sealing components, lip-shaped sealing rings of the two groups of sealing components are arranged in the same direction, and one side of the ball core is provided with the sealing switching hole, so that the downstream sealing component can work in normal use, the upstream sealing component does not work, the upstream sealing component cannot be abraded, the upstream sealing component is in a standby state, and after the downstream sealing component fails, the ball core is rotated, so that the sealing switching hole rotates to the downstream side, and the upstream sealing component is in a working state.
2. The upstream valve seat support in the method is provided with the pressure-bearing retainer ring close to the downstream side, and the arrangement of the pressure-bearing retainer ring can ensure that when the downstream sealing assembly works, the pressure on the downstream side acts on the pressure-bearing retainer ring, so that the pressure on the upstream sealing assembly is partially offset, the stress on the upstream sealing assembly is reduced, and the contact part of the upstream sealing assembly and the ball core is not abraded as far as possible in a standby state.
3. The ball valve of the method of the invention has an electric drive device, which realizes automatic drive of the valve rod through the electric drive device, and can realize transmission connection or disconnection between the electric drive device and the valve rod when receiving signals of a control module, and meanwhile, the electric drive device has a valve rod rotation range limiting function (including using a limiting device or adopting a motor for self-locking) and limits the rotation of the sealing switching hole to a non-preset position possibly caused in a manual operation mode, thereby ensuring that two groups of valve seat sealing assemblies are in preset working requirements, particularly avoiding starting a failed downstream sealing assembly, and further ensuring the correct use of the sealing assembly.
4. The method comprises the step of judging failure signals of the sealing assembly, namely judging instantaneous overpressure signals such as flash explosion and the like in a valve cavity of the ball valve, and determining whether the sealing assembly really fails or not through judgment, so that the condition that an electric driving device automatically switches upstream and downstream sealing when the sealing assembly does not really fail is avoided.
5. The control module of the method of the invention is provided with an angle detection device, and judges whether the sealing switching hole of the ball core is rotated to an incorrect working position by judging the rotating angle of the valve rod, thereby avoiding using a spare valve seat assembly or reusing a failed sealing assembly and ensuring the reliability of sealing.
6. The control module of the method can send out leakage alarm and valve seat seal replacement alarm according to the detection signal, so that an operator can conveniently master the working state of the ball valve in time, meanwhile, the valve body is provided with a flow direction indicator for indicating the flow direction of a medium, and the upper part of the valve rod is provided with a seal working position mark and a ball core switch position mark to help the operator to identify the current working state of the ball valve and the working position of the seal assembly.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention or the description of the prior art will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a cross-sectional view of the general construction of the ball valve seat seal of the present invention;
FIG. 2 is a partial view of the operational state of the seal assembly of the ball valve seat seal of the present invention
FIG. 3 is a partial view of the second seat assembly of the ball valve seat seal of the present invention in operation;
FIG. 4 is a first seat support structure of the ball valve seat seal of the present invention;
FIG. 5 is a second valve seat support structure of the ball valve seat seal of the present invention;
FIG. 6 is a second structural view of the working state of the ball valve seat seal of the present invention;
FIG. 7 is a schematic view of the first seat assembly operating condition of the ball valve seat seal of the present invention.
In the figure: 101-main valve body, 102-first valve body, 1021-first valve chamber, 103-second valve body, 1031-second valve chamber, 1032-pressure sensor, 1033-seal chamber, 1034-first step, 1035-second step, 104-upper valve body, 105-ball core, 106-valve stem, 107-lower fixed shaft, 108-packing press ring, 109-seal switching hole, 110-main valve chamber, 111-seal working position mark, 112-ball core switch position mark, 120-first valve seat component, 121-first valve seat support, 1211-pressure-bearing check ring, 122-first valve seat, 123-first pre-tightening spring, 124-first lip-shaped seal ring, 125-first energy storage spring, 130-second valve seat component, 131-second valve seat support, 132-second valve seat, 133-second pre-tightening spring, 134-second lip-shaped seal ring, 135-second energy storage spring.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments.
Thus, the following detailed description of the embodiments of the invention is not intended to limit the scope of the invention as claimed, but is merely representative of some embodiments of the invention. 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.
It should be noted that the embodiments of the present invention and the features and technical solutions thereof may be combined with each other without conflict.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "upper", "lower", and the like refer to orientations or positional relationships based on those shown in the drawings, or orientations or positional relationships that are conventionally arranged when the products of the present invention are used, or orientations or positional relationships that are conventionally understood by those skilled in the art, and such terms are used for convenience of description and simplification of the description, and do not refer to or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
The invention provides an automatic switching method of ball valve seat sealing, as shown in fig. 1 to 7, wherein a one-way arrow in the figure represents the flow direction of a pressure medium, a two-way continuous arrow represents the pressure action direction of the pressure medium, and a two-way intermittent arrow represents the spring force action direction; the ball valve comprises a main valve body 101, a first valve body 102, a second valve body 103, an upper valve body 104, a ball core 105, a valve rod 106, a lower fixed shaft 107, a packing press ring 108, a sealing switching hole 109, a sealing working position mark 111, a ball core switch position mark 112, a first valve seat assembly 120 and a second valve seat assembly 130; the ball valve applicable to the automatic switching method includes a main valve body 101 and a control module, a ball 105 is disposed in a main valve chamber 110 of the main valve body 101, a first valve body 102 and a second valve body 103 are disposed on two sides of the main valve body 101, the first valve body 102 is disposed on a first side, the first side is a medium transmission upstream side, the second valve body 103 is disposed on a second side, the second valve body 103 has a second valve chamber 1031, the second side is a medium transmission downstream side, the valve seat seal includes a first valve seat assembly 120 and a second valve seat assembly 130, the first valve seat assembly 120 is disposed in the first valve body 102, the second valve seat assembly 130 is disposed in the second valve body 103, the first valve seat assembly 120 has a first valve seat support 121, a first lip seal 124 is disposed on the first side of the first valve seat support 121, and a first valve seat 122 is disposed on the second side, the second valve seat assembly 130 has a second valve seat support 131, a second valve seat 132 is provided on a first side of the second valve seat support 131, a second lip-shaped seal 134 is provided on a second side, the first valve seat 122 and the second valve seat 132 are in sealing contact with the ball core 105, a seal switching hole 109 is provided on one side of the ball core 105, and the seal switching hole 109 is communicated with the ball core channel; a pressure-bearing retainer ring 1211 is arranged on the second side of the first valve seat support 121, an outer circle of the pressure-bearing retainer ring 1211 is in sliding contact with an inner wall of the main valve cavity 110, preferably, the outer diameter of the pressure-bearing retainer ring 1211 is the same as the inner diameter of the main valve cavity 110, that is, the pressure-bearing retainer ring 1211 is in sliding connection with the main valve cavity 110, and a small gap still exists when the outer diameter of the pressure-bearing retainer ring 1211 is in contact with the main valve cavity 110 through tolerance control in actual machining, so that a small part of pressure medium can be allowed to pass through; the upper end of the ball core 105 is connected with a valve rod 106, the valve rod 106 is connected with an electric driving device, a sealing cavity 1033 is formed between the second side of the second lip-shaped sealing ring 134 and the second valve body 103, and a pressure sensor 1032 for detecting the pressure of the sealing cavity 1033 is arranged on the second valve body 103; the control module controls the electric driver to drive the valve stem 106 to adjust the orientation of the sealing switch orifice 109 based on the signal detected by the pressure sensor 1032.
Preferably, the first valve seat support 121 and the second valve seat support 131 both have a first cylinder, a second cylinder and a third cylinder, the diameter of the second cylinder is greater than the diameter of the first cylinder, the diameter of the third cylinder is greater than the diameter of the second cylinder, the first lip-shaped sealing ring 124 and the second lip-shaped sealing ring 134 are disposed on the first cylinder, the downstream end of the first valve seat support 121 is provided with a first annular groove, the first valve seat 122 is disposed in the first annular groove, the upstream end of the second valve seat support 131 is provided with a second annular groove, the second valve seat 132 is disposed in the second annular groove, and the first valve seat 122 and the second valve seat 132 are in contact with the ball core 105 and mainly play a role in sealing.
Preferably, the open end of the first lip-shaped sealing ring 124 faces the first side and abuts against the step four of the first valve body 102, the other end of the first lip-shaped sealing ring 124 abuts against the end surface of the second cylinder, a first energy storage spring 125 is arranged in the first lip-shaped sealing ring 124, and the open edge of the first lip-shaped sealing ring 124 abuts against the inner walls of the first cylinder and the first valve body 102; the open end of the second lip-shaped sealing ring 134 faces the first side, the other end of the second lip-shaped sealing ring 134 abuts against a first step 1034 of the second valve body 103, a second energy storage spring 135 is arranged in the second lip-shaped sealing ring 134, and the opening edge of the second lip-shaped sealing ring 134 abuts against the inner walls of the first cylinder and the second valve body 103.
Preferably, a plurality of spring holes are circumferentially formed in the end surface of the third cylinder, a first pre-tightening spring 123 is arranged in the spring hole of the first valve seat support 121, the protruding end of the first pre-tightening spring 123 abuts against the third step of the first valve body 102, a second pre-tightening spring 133 is arranged in the spring hole of the second valve seat support 131, and the protruding end of the second pre-tightening spring 133 abuts against the second step 1035 of the second valve body 103.
Preferably, the second end of the first seat support 121 and the first end of the second seat support 131 are provided with inclined surfaces, and a gap is formed between the inclined surfaces and the ball core 105, so that the sealing contact between the seat and the ball core 105 is not affected by the arrangement of the seat supports.
The function of the seal switch orifice 109 is to introduce upstream media pressure into the main valve chamber 110, preventing the first seat assembly 120 from sealing.
The automatic switching method specifically comprises the following steps:
the method comprises the following steps: detecting the sealing performance of the ball valve before formal use, wherein the detection comprises detecting the pressure drop of a first side when the sealing switching hole 109 is positioned at the first side and detecting the pressure drop of the first side when the sealing switching hole 109 is positioned at the second side; specifically, pressure is applied to the valve body by a pressure tester, and then the pressure on the upstream side is maintained, and the valve seat sealing performance is judged by detecting whether the pressure on the upstream side is reduced.
Step two: when the sealing switch hole 109 is rotated to the first side, the electric driving device is disconnected from the valve rod 106, at this time, the valve rod 106 is driven by the handwheel, the second valve seat assembly 130 plays a sealing role, and the first valve seat assembly 120 does not play a sealing role.
Step three: when the second valve seat assembly 130 leaks, pressure medium enters the sealed chamber 1033, and the pressure sensor 1032 detects the pressure in the sealed chamber 1033, and determines whether the second valve seat assembly 130 is actually out of order according to the detection signal.
Step four: when the second valve seat assembly 130 is determined to be failed, the control module issues a leakage alarm, and at the same time, the pressure sensor 1032 transmits a signal to the control module, the control module controls the electric driving device to be in transmission connection with the valve rod 106, and drives the valve rod 106 to drive the ball core 105 to rotate until the sealing switching hole 109 faces the second side, and at this time, the first valve seat assembly 120 performs a sealing function.
Step five: when the first valve seat assembly 120 is operated, the electric drive will limit the rotation angle of the valve stem 106, ensuring that the seal switching hole 109 does not rotate to the first side when the hand wheel rotates the valve stem 106; activation of the failed second valve seat assembly 130 is avoided, thereby ensuring proper use of the seal assembly.
Step six: when the first seat assembly 120 also fails, the control module issues a change seat seal alert.
Preferably, in step three, when pressure sensor 1032 detects a discontinuous overpressure signal, it is determined that second seat assembly 130 is not actually failed, and when pressure sensor 1032 detects a continuous overpressure signal, it is determined that second seat assembly 130 is sealed to fail.
Preferably, when the pressure sensor 1032 detects an overpressure signal of more than 5 seconds continuously, it is determined that the second valve seat assembly 130 is sealed and failed, and the purpose of this setting is mainly to avoid overpressure in the main valve chamber 110 due to flash explosion of media and the like, and then to prevent a part of pressure media from entering the seal chamber 1033 instantaneously and being detected by the pressure sensor 1032, so as to signal that the second valve seat assembly 130 is sealed and leaked, actually, only when a continuous overpressure signal is detected, it is considered that the seal is actually leaked, and not because of flash explosion and the like but the second valve seat assembly 130 is not actually failed, it is mistaken by an operator that the second valve seat assembly 130 is failed. The judging method can avoid false alarm caused by medium flash explosion and the like, and ensures the correctness of failure judgment of the second valve seat component 130.
Preferably, in the fifth step, the control module includes an angle detection device, the valve rod 106 is disposed in the upper valve body 104, the angle detection device includes a plurality of sensing blocks disposed at equal intervals on the valve rod 106, and the sensing probe disposed on the inner wall of the upper valve body 104 sends a signal to the electric driving device when the sensing probe detects that the rotation angle of the valve rod 106 exceeds the preset angle, and the electric driving device limits the valve rod 106 from continuing to rotate.
Preferably, in the fifth step, the electric driving device is always connected to the valve rod 106, the sensing probe sends a signal to the electric driving device when detecting that the rotation angle of the valve rod 106 exceeds 90 degrees, and the electric driving device performs self-locking control on the driving motor to prevent an output shaft of the motor connected to the valve rod 106 from rotating, so as to limit the valve rod 106 from continuing to rotate; because the motor is adopted for self-locking, the contact of a mechanical structure is avoided, and the limitation of the rotation angle can be accurately controlled.
Preferably, the top of the valve rod 106 is provided with a sealing working position mark 111 for identifying the position of a pressure release hole of a ball in the valve cavity, the top of the valve rod 106 is provided with a ball core switch position mark 112 for identifying the on/off position of the ball core 105 in the valve cavity, and the outer side of the main valve body 101 is provided with a flow direction indicator for indicating that the medium flow direction is clear when the ball valve is installed and used, which indicates that the valve is in one-way sealing.
Preferably, in the fifth step, the electric driving device comprises a limit device, and the limit device is matched with a limit baffle on the valve rod 106, so that the rotation range of the valve rod 106 is limited to 0-95 degrees. The setting of above-mentioned angle can avoid sealed switching hole 109 to be rotated to the upstream side again because of the maloperation, indicate the ball core passageway to be in the open mode if 0 degree, pressure medium flows through from the ball core passageway, when closing the ball valve, valve rod 106 can rotate 95 degrees at most, can guarantee that the ball valve is in the off-state this moment, and can not further rotate, prevent exactly that operating personnel maloperation, will seal again and switch hole 109 and rotate to the upstream side to start the second valve seat subassembly 130 that has become invalid again, lead to the ball valve to appear revealing.
Preferably, the limiting device is a limiting rod, and the limiting rod extends out when the first valve seat assembly 120 works and is matched with a limiting baffle on the valve rod 106. Because the specific adoption is the gag lever post, and the gag lever post self has certain size, in order to guarantee to be in complete sealing state or conducting state after ball core 105 rotates, when adopting machinery spacing, the angle of rotation that allows is 95 degrees, and the rotation range that adopts motor auto-lock mode 5 degrees more than, mainly offsets the ball core rotation insufficient condition that the structural dimension of gag lever post brought.
Preferably, the pressure-bearing retainer 1211 is provided with a one-way drain hole (not shown in the drawings), which realizes the communication from the first side to the second side, i.e. only when the upstream sealing assembly fails, the pressure medium can enter the main valve cavity 110 formed between the ball element 105 and the main valve body 101 through the one-way drain hole from the upstream side.
Preferably, in the sixth step, when the first valve seat assembly 120 fails, the pressure medium enters the main valve cavity 110 on the second side through the one-way drain hole, specifically, when the first valve seat assembly 120 fails, the first lip-shaped sealing ring 124 deforms, the pressure medium enters the gap between the first valve seat support 121 and the first valve body 102 from the gap between the first lip-shaped sealing ring 124 and the first valve body 102, so as to enter the gap between the pressure-bearing retainer 1211 of the first valve seat support 121 and the first valve body 102, the pressure medium further enters the gap between the ball core 105 and the main valve cavity 110 through the one-way drain hole, and the pressure medium further enters the seal cavity 1033, and the pressure sensor 1032 detects the pressure signal, and the control module issues the leakage alarm, and simultaneously indicates that both the first valve seat assembly 120 and the second valve seat assembly 130 have failed, so as to issue the replacement valve seat seal alarm.
Preferably, the first step further includes rotating the seal switching hole 109 of the core 105 to a first side, applying a test fluid pressure from the first side of the ball valve by a pressure tester, and detecting whether leakage occurs from a second side; subsequently, when the ball core 105 is rotated by 180 degrees and the seal switching hole 109 of the ball core 105 is positioned at the second side, the pressure tester applies test fluid pressure from the first side of the ball valve and detects whether leakage occurs from the second side; then, the valve rod 106 is driven to rotate the ball core 105 by 180 °, and the seal switching hole 109 of the ball core 105 is located at the upstream end and returns to the initial position, thereby completing the valve seat seal performance test at both ends.
Specifically, when the fixed ball valve of the present invention is used, as shown in fig. 2-7, in the normal use state of the ball valve, the seal switching hole 109 of the ball 105 faces the first side, the pressure medium on the first side flows into the ball channel through the seal switching hole 109 and enters the main valve cavity 110 between the ball 105 and the main valve body 101, part of the pressure medium flows to the pressure-bearing check 1211 on the first valve seat support 121 on the first side, the first valve seat support 121 is further pushed to move towards the first side, the first valve seat assembly 120 does not perform the sealing function, part of the pressure medium enters the second lip seal 134 along the gap between the second valve seat support 131 and the second valve body 103, the second lip seal 134 of the second valve seat assembly 130 is subjected to the medium pressure to perform the sealing function, and at the same time, the second spring force storage spring 135 in the second lip seal 134 applies the upward and downward force to further increase the sealing effect, the second valve seat assembly 130 achieves sealing, and meanwhile, an electric driving device arranged on the upper valve body 104 is separated from being connected with the valve rod 106, so that the rotation of the valve rod 106 is not limited; of course, the rotation of the valve stem 106 may also be limited by an electric drive if to prevent the operator from inadvertently rotating the seal switch bore 109 downstream while the second valve seat assembly 130 is functioning.
As shown in fig. 4, when the second seat assembly 130 fails to seal, part of the pressure medium enters the seal chamber 1033, and after the second seat assembly 130 is judged to be a true seal failure, the control module issues a leak alarm, and the electric drive automatically rotates the valve rod 106 180 degrees to make the seal switching hole 109 face the second side, and the pressure medium on the first side cannot enter the main valve chamber 110 between the ball 105 and the main valve body 101, and at this time, the pressure medium in the first valve chamber 1021 acts on the first seat assembly 120, and the first lip seal 124 of the first seat assembly 120 is sealed by the medium pressure, and pushes the first seat support 121 to move to the second side, so as to seal the first seat assembly 120, and at the same time, the first energy storage spring 125 in the first lip seal 124 exerts a spring force upwards and downwards to further increase the sealing effect; then, a limiting device or a motor self-locking mode is adopted to limit the rotation angle of the valve rod 106, so that the sealing switching hole 109 on the ball core 105 cannot rotate to the first side.
The ball valve used by the method of the invention is provided with two groups of sealing components, lip-shaped sealing rings of the two groups of sealing components are arranged in the same direction, and one side of the ball core is provided with the sealing switching hole, so that the downstream sealing component can work in normal use, the upstream sealing component does not work, and sealing abrasion can not be caused, so that the upstream sealing component is in a standby state, and after the downstream sealing component fails, the ball core is rotated, so that the sealing switching hole rotates to the downstream, the upstream sealing component is in a working state, the downstream sealing component and the upstream sealing component can be used in sequence, the effect that the two groups of sealing components participate in sealing successively can be achieved, the service life of the valve seat sealing is prolonged, and the manufacturing and using cost is reduced; in addition, the upstream valve seat support is provided with a pressure-bearing retainer ring close to the downstream side, and the pressure-bearing retainer ring is arranged to ensure that when the downstream sealing assembly works, the pressure on the downstream side acts on the pressure-bearing retainer ring, so that the pressure on the upstream sealing assembly is partially offset, the stress on the upstream sealing assembly is reduced, and the contact part of the upstream sealing assembly and the ball core is ensured not to be abraded as far as possible in a standby state.
The ball valve is provided with an electric driving device, the valve rod is automatically driven through the electric driving device, the electric driving device can be connected with or disconnected from the transmission of the valve rod when a control module signals, meanwhile, the electric driving device has a valve rod rotation range limiting function (including using a limiting device or adopting a motor for self-locking), the situation that an operator rotates the sealing switching hole to a non-working position by mistake when in a manual operation mode is limited, if the sealing switching hole is rotated to an upstream side by mistake when facing to a downstream side, therefore, two groups of valve seat sealing assemblies are ensured to be in preset working positions, particularly, the downstream sealing assembly which fails is prevented from being started, and therefore, the sealing assembly is ensured to be correctly used.
According to the automatic switching method for the sealing of the ball valve seat, in the process that the ball valve is opened and closed by the ball core, the rotation of the ball core is mainly realized by manually operating the rotary valve rod, and when the sealing assemblies at the upstream and downstream are switched, the electric driving device is involved, the valve rod is automatically rotated in time under the cooperation of the control module, so that the automatic switching of the two groups of sealing assemblies is realized, and when the sealing assemblies are switched, the rotary valve rod is still manually operated to realize the opening and closing of the ball valve; specifically when using seal assembly, need reveal the signal to seal assembly and judge, to the superpressure signal in the twinkling of an eye that the phenomenon such as the flash explosion that appears in the present ball valve caused, confirm whether really became invalid seal assembly through judging to avoid when not really becoming invalid electric drive device to carry out the sealed action of automatic switch upstream and downstream. The control module is provided with an angle detection device, and whether the sealing switching hole of the ball core is rotated to an incorrect working position is judged by judging the rotating angle of the valve rod, so that the use of a spare valve seat assembly or the reuse of a failed sealing assembly is avoided, and the sealing reliability is ensured. Control module can send out according to the detected signal and reveal the alarm and the sealed alarm of changing of disk seat, makes things convenient for operating personnel in time to master ball valve operating condition, simultaneously, sets up the flow direction sign on the valve body for instruct the medium flow direction, set up sealed operating position mark and ball core switch position mark on valve rod upper portion simultaneously, help operating personnel discernment current ball valve's operating condition and seal assembly's operating position.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. A method for automatically switching a ball valve seat seal, the ball valve comprising a main valve body and a control module, a ball core being arranged in a main valve cavity of the main valve body, a first valve body and a second valve body being arranged on both sides of the main valve body, the first valve body being arranged on a first side and the second valve body being arranged on a second side, characterized in that the seat seal comprises a first seat assembly and a second seat assembly, the first seat assembly being arranged in the first valve body and the second seat assembly being arranged in the second valve body, the first seat assembly having a first seat support, the first side of the first seat support being provided with a first lip seal, the second side being provided with a first valve seat, the second seat assembly having a second seat support, the first side of the second seat support being provided with a second valve seat, the second side being provided with a second lip seal, the first valve seat and the second valve seat are in sealing contact with the ball core, one side of the ball core is provided with a sealing switching hole, and the sealing switching hole is communicated with the ball core channel; the opening end of the first lip-shaped sealing ring faces to the first side, and the opening end of the second lip-shaped sealing ring faces to the first side; a second side of the first valve seat support is provided with a pressure-bearing retainer ring, and the excircle of the pressure-bearing retainer ring is in sliding contact with the inner wall of the main valve cavity; the upper end of the ball core is connected with a valve rod, the valve rod is connected with an electric driving device, a sealing cavity is formed between the second side of the second lip-shaped sealing ring and the second valve body, and a pressure sensor for detecting the pressure of the sealing cavity is arranged on the second valve body; the control module controls the electric driving device to drive the valve rod to adjust the position of the sealing switching hole according to the signal of the pressure sensor;
the automatic switching method comprises the following steps:
the method comprises the following steps: before formal use, detecting the sealing performance of the ball valve, detecting the pressure drop of the first side when the sealing switching hole is positioned at the first side, and detecting the pressure drop of the first side when the sealing switching hole is positioned at the second side;
step two: the sealing switching hole is rotated to the first side, the electric driving device is disconnected from the valve rod, at the moment, the valve rod is driven by the hand wheel, the second valve seat assembly plays a role in sealing the ball valve, and the first valve seat assembly does not play a role in sealing;
step three: when the second valve seat assembly leaks, the pressure sensor detects the pressure of the sealed cavity, and whether the second valve seat assembly really fails or not is judged according to the detection signal;
step four: when the second valve seat assembly is judged to be invalid, the control module sends out a leakage alarm, meanwhile, the pressure sensor transmits a signal to the control module, the control module controls the electric driving device to be in transmission connection with the valve rod, the valve rod is driven to drive the ball core to rotate until the sealing switching hole faces the second side, and the first valve seat assembly plays a sealing role;
step five: when the first valve seat assembly works, the electric driving device limits the rotation angle of the valve rod and ensures that the sealing switching hole does not rotate to the first side when the valve rod is rotated by the hand wheel;
step six: the control module issues a replacement seat seal alert when the first seat assembly fails.
2. The method for automatically switching the seal of a seat of a ball valve according to claim 1,
and in the third step, when the pressure sensor detects a discontinuous overpressure signal, judging that the second valve seat component does not really fail, and when the pressure sensor detects a continuous overpressure signal, judging that the second valve seat component is sealed to fail.
3. The method for automatically switching the seal of a seat of a ball valve according to claim 2,
and when the pressure sensor detects an overpressure signal for more than 5 seconds continuously, judging that the second valve seat component is sealed and failed.
4. The method for automatically switching the seal of a seat of a ball valve according to claim 3,
in the fifth step, the control module comprises an angle detection device, the valve rod is arranged in the upper valve body, the angle detection device comprises a plurality of sensing blocks arranged on the valve rod at equal intervals, and a sensing probe arranged on the inner wall of the upper valve body sends a signal to the electric driving device when the sensing probe detects that the rotation angle of the valve rod exceeds a preset angle, and the electric driving device limits the valve rod to continue rotating.
5. The method for automatically switching the seal of a seat of a ball valve according to claim 4,
in the fifth step, the electric driving device is always connected with the valve rod, when the sensing probe detects that the rotation angle of the valve rod exceeds 90 degrees, the sensing probe sends a signal to the electric driving device, and the electric driving device realizes the limitation of the rotation of the valve rod through the self-locking of the driving motor.
6. The method for automatically switching the seal of a seat of a ball valve according to claim 4,
in the fifth step, the electric driving device comprises a limiting device, and the limiting device is matched with a limiting baffle plate on the valve rod, so that the rotating range of the valve rod is limited within 0-95 degrees.
7. The method of automatically switching a ball valve seat seal according to claim 6, wherein said limiting means is a limiting rod that extends out to engage a limiting stop on the valve stem when the first valve seat assembly is in operation.
8. The method for automatically switching the seal of a seat for a ball valve according to any one of claims 5 or 7,
and the pressure-bearing retaining ring is provided with a one-way drainage hole which realizes the conduction from the first side to the second side.
9. The method for automatically switching a ball valve seat seal according to claim 8, wherein in step six, when the first valve seat assembly fails, pressure medium enters the main valve chamber on the second side through the one-way bleed hole, and when the pressure sensor detects a pressure signal when the medium enters the seal chamber, the control module issues a leak alarm.
10. The method for automatically switching a seal of a seat of a ball valve according to claim 9, wherein the first step further comprises rotating the seal switching hole of the core to a first side, and the pressure tester applies a test fluid pressure from the first side of the ball valve and detects whether or not a leak is generated from a second side; subsequently, the ball core is rotated by 180 degrees, the seal switching hole of the ball core is positioned at the second side, the pressure tester applies test fluid pressure from the first side of the ball valve, and whether leakage occurs or not is detected from the second side.
CN202210777104.8A 2022-07-04 2022-07-04 Automatic switching method for sealing of ball valve seat Active CN114838158B (en)

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Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
CN115789289B (en) * 2023-02-07 2023-04-07 成都成高阀门有限公司 High-pressure ball valve
CN116255467B (en) * 2023-05-10 2023-07-21 成都成高阀门有限公司 Double-cutoff forced sealing valve and control method thereof
CN116336394B (en) * 2023-05-31 2023-07-21 成都成高阀门有限公司 Automatic medium cavity discharging system and self-detection method thereof

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002086356A2 (en) * 2001-04-18 2002-10-31 Bal Seal Engineering Self contained anti-blowout seal for fluids or gases
CN103759038B (en) * 2014-01-27 2017-02-01 苏州纽威阀门股份有限公司 Top-installed type ball valve
WO2015162581A1 (en) * 2014-04-23 2015-10-29 Broen Oil & Gas Sp.Z.O.O A valve, and a method for effectively sealing an area between two surfaces in a valve and use thereof
CN207394011U (en) * 2017-11-14 2018-05-22 浙江米勒洁净设备科技有限公司 Three-flat ball valve
CN214331541U (en) * 2020-11-27 2021-10-01 苏州纽威阀门股份有限公司 Double-valve device
CN114060562A (en) * 2021-12-10 2022-02-18 上海美科阀门有限公司 Bidirectional wedge-shaped sealing structure and low-temperature fixed ball valve with same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
高压大口径球阀整体焊接阀体免焊后热处理工艺;童俊等;《阀门》;20150225(第01期);第21-24页 *

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Address after: No. 67, Section 1, Xueshan Avenue, Dayi County, Chengdu City, Sichuan Province, 611330

Patentee after: Chengdu Chenggao Valve Co.,Ltd.

Patentee after: CHENGDU CHENGFENG VALVE Co.,Ltd.

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Address before: 611330 No. 67, Gongye Avenue, Dayi County, Chengdu, Sichuan

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