CN211347262U - Inspection device for valve shell leakage - Google Patents

Inspection device for valve shell leakage Download PDF

Info

Publication number
CN211347262U
CN211347262U CN201921187728.4U CN201921187728U CN211347262U CN 211347262 U CN211347262 U CN 211347262U CN 201921187728 U CN201921187728 U CN 201921187728U CN 211347262 U CN211347262 U CN 211347262U
Authority
CN
China
Prior art keywords
cavity
valve
isobaric
detected
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201921187728.4U
Other languages
Chinese (zh)
Inventor
任利杰
张啸峰
赵首琦
汪程明
顾琪
杨近天
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.)
CNNC Sufa Technology Industry Co Ltd
Original Assignee
CNNC Sufa Technology Industry Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CNNC Sufa Technology Industry Co Ltd filed Critical CNNC Sufa Technology Industry Co Ltd
Priority to CN201921187728.4U priority Critical patent/CN211347262U/en
Application granted granted Critical
Publication of CN211347262U publication Critical patent/CN211347262U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

The utility model belongs to the field of valve shell leakage inspection, in particular to a device and a method for inspecting valve shell leakage. The utility model provides a device for valve housing leaks, includes isobaric appearance chamber, check valve and the chamber of examining that communicates in proper order, at isobaric appearance chamber and examine and set up differential pressure sensor between the chamber. This neotype effect that is showing is: the technical scheme is that a high-precision pressure sensor is used for measuring pressure difference in real time to replace a mode of respectively measuring pressure and then solving difference values, so that the measurement precision of a pressure difference method is greatly improved, meanwhile, the pressure drop of a system is measured in advance to compensate and correct the measured pressure difference change value, and whether the shell leakage occurs in the valve can be judged according to the pressure difference change value by using the method.

Description

Inspection device for valve shell leakage
Technical Field
This novel valve housing leakage inspection field that belongs to specifically is a valve housing leaks verifying attachment.
Background
The valve is used as a pressure-bearing device, is widely applied to the industries of petrochemical industry, coal chemical industry, nuclear power and the like, and mainly plays a role in cutting off media. It works normally and is related to the safety production of the whole set of equipment.
The existing valve shell leakage inspection method needs an operator to visually inspect the surface of the pressurized valve, so that the efficiency is low, and the operator is in direct contact with the pressurized cavity, so that the safety risk exists.
At present, the valve shell leakage is difficult to be detected by using a differential pressure method because: when the absolute value of the pressure is large, the pressure change under the tiny leakage is difficult to be directly measured by the precision of the commonly used pressure measuring elements (such as a pressure gauge, a sensor and the like); meanwhile, part of soft sealing materials can be applied to the inspection device, and certain elastic deformation can also occur to the pipeline and the valve, so that the pressure drop occurs in the detection process due to the system, and the use effect of a differential pressure method is influenced.
SUMMERY OF THE UTILITY MODEL
The method solves the problem that in the background art, when the absolute value of pressure is large, the precision of a pressure measuring element is difficult to directly measure the pressure change under tiny leakage, and eliminates the influence of the pressure drop of a test system through the application of a model comparison method, thereby accurately judging whether the leakage of the shell occurs.
This is novel to realize like this: the utility model provides a verifying attachment that valve housing leaked, includes isobaric appearance chamber, check valve that communicate in proper order and waits to examine the chamber, at isobaric appearance chamber and wait to set up differential pressure sensor between examining the chamber.
According to the device for detecting leakage of the valve shell, one end of the cavity to be detected is an inlet end, one end of the isobaric cavity is an outlet end, and the check valve is arranged in a direction that the cavity to be detected is communicated with the isobaric cavity and is reversely cut off.
The device for checking the leakage of the valve shell is characterized in that a pressure sensor is further arranged on the cavity to be checked.
The device for detecting the leakage of the valve shell is characterized in that the inlet and the outlet of the cavity to be detected are both provided with test end sockets.
A valve housing leak testing apparatus as described above, wherein a shut-off valve is provided on the inlet end piping.
A valve housing leak testing apparatus as described above, wherein a shut-off valve is provided on the outlet end line.
The valve housing leakage inspection device is characterized in that the isobaric cavity is structurally and rigidly larger than the cavity to be inspected.
The device for detecting leakage of the valve shell is characterized in that the structural rigidity of the isobaric cavity is far greater than that of the cavity to be detected, namely the yield strength of the material of the isobaric cavity is at least 20% greater than that of the material of the cavity to be detected.
This neotype effect that is showing is: the technical scheme is that a high-precision pressure sensor is used for measuring pressure difference in real time to replace a mode of respectively measuring pressure and then solving difference values, so that the measurement precision of a pressure difference method is greatly improved, meanwhile, the pressure drop of a system is measured in advance to compensate and correct the measured pressure difference change value, and whether the shell leakage occurs in the valve can be judged according to the pressure difference change value by using the method.
Drawings
Fig. 1 is a schematic diagram of a differential pressure detection mechanism.
In the figure: 1. outlet cut-off valve, 2 isobaric containing cavity, 3 check valve, 4 test seal head, 5 to-be-detected cavity (valve inner cavity), 6 test seal head, 7 inlet cut-off valve, 8 pressure sensor and 9 differential pressure sensor
Detailed Description
The invention will be further described with reference to the accompanying drawings:
as shown in the attached figure 1, the device for leakage of the valve shell comprises an isobaric containing cavity, a one-way valve and a cavity to be detected which are sequentially communicated, and a differential pressure sensor is arranged between the isobaric containing cavity and the cavity to be detected.
One end of the chamber to be detected is an inlet end, one end of the isobaric cavity is an outlet end, and the one-way valve is arranged in a direction of being communicated and reversely cut off from the chamber to be detected to the isobaric cavity.
The cavity to be detected is also provided with a pressure sensor.
The inlet and the outlet of the cavity to be detected are both provided with test seal heads.
And a stop valve is arranged on the inlet end pipeline.
And a stop valve is arranged on the outlet end pipeline.
The isopipe volume is structurally more rigid than the chamber to be inspected.
The structural rigidity of the isobaric cavity is far greater than that of the cavity to be detected, namely the yield strength of the material of the isobaric cavity is at least 20% greater than that of the material of the cavity to be detected.
A method for valve housing leakage, comprising the steps of:
the method comprises the following steps: two cavities are communicated
Closing the cut-off valve, feeding pressure to the inlet end, and communicating the isobaric containing cavity with the cavity to be detected in the process, wherein the two containing cavities are always isobaric;
step two: turn-off pressure maintaining
When the pressure sensor reaches the test pressure, closing the cut-off valve and maintaining the pressure; if the shell body leaks from the cavity to be detected, the pressure in the cavity is reduced, at the moment, the pressure of the isobaric cavity is kept unchanged under the action of the one-way valve, and the pressure difference between the isobaric cavity and the cavity to be detected can be detected by a pressure difference sensor;
step three: reading discrimination
And reading data according to the differential pressure sensor, generating a differential pressure change value of the valve through pressure drop compensation of a system, and judging whether the valve has shell leakage according to the differential pressure change value.
The structure and the method for realizing the novel purpose are as follows:
1. differential pressure detection structure
A sufficiently rigid structure is used to create an isobaric chamber in communication with the valve lumen. The isobaric cavity is communicated with the valve inner cavity in an initial state, so that the isobaric cavity is isobaric with the valve inner cavity. When leakage detection is carried out, a passage between the isobaric containing cavities and the valve inner cavity is cut off, if the valve leaks from the shell, the pressure of the valve inner cavity is reduced, the pressure of the isobaric containing cavities keeps constant pressure, pressure difference occurs, and the pressure difference of the two containing cavities is measured by using a pressure difference sensor. The tiny pressure drop of the inner cavity of the valve is measured by the relative comparison of the pressure values of the two cavities.
2. Pressure drop compensation for a system
By means of the structure, the differential pressure value can be accurately measured, differential pressure change data of the valve without external leakage of the shell of a certain specification can be collected through pre-testing in the same leakage detection system, and the data is used as a system pressure drop compensation basis. And the valve for shell leakage inspection corrects the differential pressure change value of the valve through pressure drop compensation of the system, and accurately judges whether shell leakage occurs in the valve according to the corrected differential pressure change value.
1. According to the pressure difference inspection principle, a structure as shown in the figure can be established, and the structure comprises an outlet cut-off valve 1, an isobaric containing cavity 2, a one-way valve 3, a test seal head 4, a cavity to be inspected (a valve inner cavity) 5, a test seal head 6, an inlet cut-off valve 7, a pressure sensor 8 and a pressure difference sensor 9. The pressure sensor 8 controls the test pressure, the differential pressure sensor 9 collects test data, and the outlet cut-off valve 1, the one-way valve 3 and the inlet cut-off valve 7 control the operation of the pipeline.
In the detection step, firstly, the outlet cut-off valve 1 is closed, the inlet end is pressed, the isobaric cavity 2 is communicated with the cavity to be detected 5 in the process, and the two cavities are always isobaric. Secondly, when the pressure sensor 8 reaches the test pressure, the cut-off valve 7 is closed, and the pressure is maintained; if the shell body leakage appears in the cavity 5 to be detected, the pressure in the cavity is reduced, at the moment, the pressure in the isobaric accommodating cavity 2 is kept unchanged under the action of the one-way valve 3, and the pressure difference appears between the isobaric accommodating cavity 2 and the cavity 5 to be detected and can be detected by the pressure difference sensor 9. Thirdly, reading data according to the differential pressure sensor 9, generating a differential pressure change value of the valve through pressure drop compensation of the system, and judging whether the valve has shell leakage according to the differential pressure change value.
2. In order to ensure the reliable numerical value of the pressure difference, the structural rigidity of the isobaric cavity 2 is far larger than that of the cavity 5 to be detected.

Claims (8)

1. A valve housing leakage testing device, characterized in that: the pressure-equalizing type pressure-measuring device comprises an isobaric containing cavity (2), a one-way valve (3) and a to-be-detected cavity (5) which are sequentially communicated, and a pressure difference sensor (9) is arranged between the isobaric containing cavity (2) and the to-be-detected cavity (5).
2. A valve housing leak testing apparatus as defined in claim 1, wherein: one end of the cavity to be detected (5) is an inlet end, one end of the isobaric cavity (2) is an outlet end, and the one-way valve (3) is arranged in a way that the cavity to be detected (5) is communicated with the isobaric cavity (2) and is reversely cut off.
3. A valve housing leak testing apparatus as defined in claim 2, wherein: the cavity (5) to be detected is also provided with a pressure sensor (8).
4. A valve housing leak testing apparatus according to claim 3, wherein: the inlet and the outlet of the cavity (5) to be detected are both provided with a test seal head (4).
5. A valve housing leak testing apparatus according to claim 4, wherein: an inlet shut-off valve (7) is arranged on the inlet end pipeline.
6. A valve housing leak testing apparatus as defined in claim 5 wherein: an outlet cut-off valve (1) is arranged on the outlet end pipeline.
7. A valve housing leak testing apparatus according to claim 6, wherein: the structural rigidity of the isobaric cavity (2) is far greater than that of the cavity to be detected (5).
8. A valve housing leak testing apparatus according to claim 7, wherein: the structural rigidity of the isobaric cavity (2) is far greater than that of the cavity to be detected (5), namely the structural rigidity of the isobaric cavity is far greater than that of the cavity to be detected, namely the yield strength of the material of the isobaric cavity is at least 20% greater than that of the material of the cavity to be detected.
CN201921187728.4U 2019-07-26 2019-07-26 Inspection device for valve shell leakage Active CN211347262U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201921187728.4U CN211347262U (en) 2019-07-26 2019-07-26 Inspection device for valve shell leakage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921187728.4U CN211347262U (en) 2019-07-26 2019-07-26 Inspection device for valve shell leakage

Publications (1)

Publication Number Publication Date
CN211347262U true CN211347262U (en) 2020-08-25

Family

ID=72102648

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201921187728.4U Active CN211347262U (en) 2019-07-26 2019-07-26 Inspection device for valve shell leakage

Country Status (1)

Country Link
CN (1) CN211347262U (en)

Similar Documents

Publication Publication Date Title
CN101191754A (en) Checking apparatus for checking product sealing performance and checking method
JP6636044B2 (en) Leak inspection apparatus and method
CN201965006U (en) Lithium ion battery differential pressure formula leak hunting device
CN204346638U (en) A kind of pressure calibration/calibrating installation
CN201917443U (en) High-pressure gas precision detecting pipeline system used for detecting product
CN103786932A (en) Infusion soft bag heat seal strength online detecting device and infusion soft bag production line
CN105387977A (en) Installing edge leak detection system and method for two-chamber three-pressure zone structure of aero-engine
CN112840192A (en) Test method for testing the tightness of a cable and tightness testing device for carrying out the method
CN108387346B (en) Air-tight leakage detection method for propellant supply pipeline of liquid rocket engine
US8448498B1 (en) Hermetic seal leak detection apparatus
US4182158A (en) Static pressure orifice system testing method and apparatus
CN216410654U (en) Valve housing strength detection device
CN103398830B (en) A kind of grease chamber's sealing leak hunting method of load ratio bridging switch
CN211347262U (en) Inspection device for valve shell leakage
CN103383302A (en) Online testing and adjusting device for set pressure of direct-operated relief valve
CN208239037U (en) A kind of valve seal device for detecting performance
CN112304526A (en) Device and method for detecting leakage of valve shell
CN110553802B (en) Leakage detection device and method for large leakage measurement
CN102928183B (en) Liquefied petroleum gas cylinder valve high-low pressure seals step detection method and a pick-up unit
CN102455245A (en) Pressure-change leakage detection method adopting hysteretic temperature compensation
TWI494554B (en) Method and device for differential pressure measurement
CN204085808U (en) A kind of air-tightness detection device
CN210089813U (en) Simple and easy calibrating device of vapour-pressure type level gauge
CN103786931A (en) Transfusion soft bag heat-seal strength on-line detecting device and transfusion soft bag production line
CN111044218A (en) Response time measuring device of vacuum pressure gauge

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant