CN116609008A - Valve leakage testing system and method in high-low temperature environment - Google Patents
Valve leakage testing system and method in high-low temperature environment Download PDFInfo
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- CN116609008A CN116609008A CN202310533667.7A CN202310533667A CN116609008A CN 116609008 A CN116609008 A CN 116609008A CN 202310533667 A CN202310533667 A CN 202310533667A CN 116609008 A CN116609008 A CN 116609008A
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- 238000012360 testing method Methods 0.000 title claims abstract description 71
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- 230000006835 compression Effects 0.000 claims description 18
- 238000007906 compression Methods 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 11
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 5
- 238000003860 storage Methods 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229910052697 platinum Inorganic materials 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 34
- 238000001514 detection method Methods 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/86—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/86—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure
- G01F1/88—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure with differential-pressure measurement to determine the volume flow
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- Examining Or Testing Airtightness (AREA)
Abstract
The utility model provides a valve leakage test system under high low temperature environment, its test gas circuit device includes air source jar, stop valve, pressure regulator, emergency cut valve, control valve one, control valve two, control valve three, balance tank, standard volume jar, differential pressure sensor and discharge valve, air source jar, stop valve, pressure regulator, emergency cut valve, control valve one, balance tank, control valve two, standard volume jar, control valve three and the valve series connection of being tested, differential pressure sensor connects between balance tank and standard volume jar, install the discharge valve on the bifurcation pipeline between emergency cut valve and the control valve one, its control system is connected with pressure regulator, emergency cut valve, discharge valve, pressure sensor, temperature sensor, differential pressure sensor, the open/close signal output of control valve one, control valve two and control valve three is in the control system. The invention can solve the technical problem that the leakage of valve products with apertures DN 8-DN 100 is difficult to obtain quantitatively in a high and low temperature environment of-40 to +80 ℃.
Description
Technical Field
The invention belongs to the field of valve testing, and particularly relates to a valve leakage testing system and a valve leakage testing method in a high-low temperature environment.
Background
The applicable temperature range of the valve for the municipal pipeline in China is generally-20 to +60 ℃, but with the occurrence of extremely high heat and cold conditions in part of China in recent years, the leakage amount of a valve product in a high-low temperature environment is required to be checked to be qualified for production and sale. The leakage amount test of the existing valve products is usually carried out by using an airtight leak detector or a bubble leak detection method, the bubble leak detection method is usually only capable of qualitatively judging leakage, the leakage amount cannot be accurately and quantitatively known, the bubble leak detection cannot be used in a low-temperature environment, the airtight leak detector is mainly used for small-volume detected parts, and the accuracy of the airtight leak detector is reduced when the detected parts are large in volume and sensitive to temperature due to the fact that temperature correction is not added, and particularly in a high-low-temperature environment, the pipeline and the pressure measuring position of the airtight leak detector are located outside the high-low-temperature environment, so that the accuracy and consistency of results are very low.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a valve leakage amount testing system in a high-low temperature environment, so as to solve the technical problem that the valve product leakage amount of apertures DN 8-DN 100 is difficult to quantitatively obtain in the high-low temperature environment of-40 to +80 ℃.
The invention further aims to provide a test method of the valve leakage testing system under the high-low temperature environment.
The technical scheme of the invention is as follows: the utility model provides a valve leakage test system under high low temperature environment, includes test gas circuit device and control system, test gas circuit device includes air source jar, stop valve, pressure regulator, emergency shut-off valve, control valve one, control valve two, control valve three, balance tank, standard volume jar, differential pressure sensor and discharge valve, air source jar, stop valve, pressure regulator, emergency shut-off valve, control valve one, balance tank, standard volume jar, control valve three and the valve series connection that is tested, install control valve two on the connecting line between balance tank and the standard volume jar, balance tank with all connect pressure sensor and temperature sensor on the standard volume jar, differential pressure sensor's one end is located balance tank, the other end is located the standard volume jar, install discharge valve on the bifurcation pipeline between emergency shut-off valve and the control valve one, control system passes through data acquisition module, data/signal transmission line and pressure regulator, emergency shut-off valve, discharge valve, pressure sensor, temperature sensor, differential pressure sensor are connected, realize data signal's transmission, control valve one, control valve two and control valve three open to the control system in the output signal.
The test method of the valve leakage testing system in the high-low temperature environment is characterized by comprising the following steps of: the method comprises the following steps:
(A1) The tested valve is connected with the test system, under the condition of room temperature, the stop valve, the emergency stop valve, the first control valve and the second control valve are opened, the third control valve is closed, and the control system adjusts the pressure regulator to enable the standard volume tank to be at the pressure p v1 ，p v1 For the first pressure not too high, the second control valve is closed, and the real-time temperature T of the standard volume tank is recorded v1 Opening the control valve III, and recording the real-time pressure p of the standard volume tank v2 And temperature T v2 According to the volume V of the standard volume tank b And the relation of an ideal gas state equation, calculating the total volume V of the standard volume tank, the tested valve and the accessory pipeline t
(A2) In the high-low temperature environment, the temperature of the air is high,opening a stop valve, an emergency stop valve, a first control valve and a second control valve, and regulating a pressure regulator by a control system to enable the pressure of the balance tank to be the test pressure p t Closing the first control valve and the emergency stop valve, opening the exhaust valve to exhaust, and recording the real-time pressure p of the balance tank 1 And temperature T 1 For a certain time t 1 Thereafter, the leakage q of the balance tank is calculated 1
Wherein: v (V) p Is the volume of the balance tank in the standard state; t is t 1 The test time; p is p t 、p 1 、p n The absolute pressure of the medium in the balance tank before and after valve closing and the absolute pressure of the gas in the standard state are respectively; t (T) t 、T 1 、T n The thermodynamic temperature of the medium in the balance tank before and after valve closing and the thermodynamic temperature of the gas in the standard state are respectively; z t 、z n The gas compression coefficients of the medium in the balance tank before and after valve closing and the gas compression coefficient of the medium in the standard state are respectively; alpha is the linear expansion coefficient of the balance tank material;
(A3) Under the high-low temperature environment, a stop valve, an emergency stop valve, a first control valve and a second control valve are opened, a third control valve is closed, and a control system adjusts a pressure regulator to enable the pressure of the standard volume tank to be the test pressure p t Closing the second control valve and the emergency stop valve, opening the exhaust valve to exhaust, and recording the real-time pressure p of the standard volume tank 2 And temperature T 2 For a certain time t 2 Thereafter, the leakage q of the standard can is calculated 2
Wherein: v (V) b Is the volume of the standard volume tank in the standard state; t is t 2 The test time; p is p t 、p 2 、p n Respectively the standards before and after valve closingAbsolute pressure of medium in the volume tank and absolute pressure of gas in standard state; t (T) t 、T 2 、T n The thermodynamic temperature of the medium in the standard volume tank before and after valve closing and the thermodynamic temperature of the medium in the standard state are respectively; z t 、z n The gas compression coefficients of the medium in the standard volume tank before and after valve closing and the gas compression coefficient of the medium in the standard state are respectively; alpha is the linear expansion coefficient of the standard volume tank material;
(A4) According to the leakage quantity index q of the valve to be tested b Confirming leakage q of balance tank and standard volume tank 1 And q 2 Whether or not it is less than 0.01q b ；
(A5) Under the high-low temperature environment, a stop valve, an emergency stop valve, a first control valve, a second control valve and a third control valve are opened, and a control system adjusts a pressure regulator to enable the pressure of the standard volume tank to be the test pressure p t Closing the first control valve and the emergency stop valve, and opening the exhaust valve to exhaust;
(A6) Monitoring a differential pressure sensor and temperature sensors on two tanks, when the differential pressure and the temperature difference are less than 0.1 ℃ and the system is considered to be balanced, closing a control valve II, opening stop valves at two ends of the differential pressure sensor, recording the real-time differential pressure deltap of the differential pressure sensor, and after a certain time t, calculating the leakage q of the valve to be tested
Wherein: v (V) t The total volume of the standard volume tank, the valve to be tested and the auxiliary pipeline in the standard state; t is the test time; Δp real-time differential pressure; t (T) t 、T n Respectively the thermodynamic temperature of the medium in the standard volume tank and the thermodynamic temperature of the medium in the standard state; z t 、z n The gas compression coefficient of the medium in the standard volume tank and the gas compression coefficient of the medium in the standard state are respectively; alpha is the linear expansion coefficient of the standard volume tank material.
Preferably, the control system is a PLC computer control system.
Preferably, a tee joint is arranged between the emergency cut-off valve and the first control valve and is connected with an exhaust valve.
Preferably, the balance tank and the standard volume tank are pressure storage tanks with the same volume, and the volume is 1-5L.
Preferably, the pressure sensor is a 0.04-level absolute pressure transmitter.
Preferably, the differential pressure sensor is a 0.04-level absolute pressure transmitter, and independent stop valves are arranged on the pipelines connected with the balance tank and the standard volume tank.
Preferably, the temperature sensor is a Pt1000 platinum thermal resistor.
Preferably, the first control valve, the balance tank, the second control valve, the standard volume tank, the third control valve and the tested valve are surrounded by a heat exchange cover, the heat exchange cover is of a metal structure, and fins or thin-wall tubes are distributed on the surface of the heat exchange cover.
Preferably, the switch handles of the first control valve, the second control valve and the third control valve are arranged in the heat exchange cover through extension bars, and the switch handles are provided with on/off signals to be output to the control system.
Aiming at the defects of the prior art, the implementation of the invention has the following beneficial effects:
1. the application range is wider, and the leakage test of different types of valves at different temperatures can be satisfied;
2. the accuracy is higher, the pressure sensitivity is higher by adopting a method of monitoring differential pressure instead of monitoring pressure drop, and a balance tank with the same volume is introduced to compensate pressure change caused by temperature change;
3. the PLC computer control system is used for completing the test, so that the information such as pressure, temperature, differential pressure, leakage amount and the like can be displayed in real time, and test data can be stored;
4. the system has the functions of power failure protection and overpressure protection, and can automatically relieve pressure after power failure or when the pressure of a pipeline is too high;
5. the test system is complete in configuration and is suitable for the scenes of valve leakage test in different national standards and industry standards.
Drawings
Fig. 1 is a schematic diagram of a system according to an embodiment of the present invention.
Wherein: 1-a stop valve; 2-a pressure regulator; 3-emergency shut-off valve; 4-exhaust valve; 5-control valve one; 6-balancing tank; 7-a second control valve; 8-standard volume tank; 9-a control valve III; 10-valve under test; 11-first pressure sensor; 12-a first temperature sensor; 13-differential pressure sensor; 14-a second pressure sensor; 15-a second temperature sensor; 16-a heat exchange cover; 17-a PLC computer control system; 18-an air source tank.
Detailed Description
The process and working principle of the valve leakage testing device and the testing method thereof under the high-low temperature environment provided by the invention are further described in detail below with reference to the embodiments and the accompanying drawings. The present embodiments are to be considered as illustrative and not restrictive, and the scope of the invention is not to be limited thereto.
The test device of the present invention is described in further detail below with reference to fig. 1.
As shown in fig. 1, the thick solid line is a test line of the test device, the thin solid line is a pressure signal or driving pressure, and the broken line is a signal line.
The invention provides a valve leakage test system under high and low temperature environments, which comprises a test gas path device and a PLC computer control system, wherein the PLC computer control system is provided with a test data processing function, a result storage function, an emergency cut-off and exhaust function after power failure or after overhigh pressure and a USB socket position and is used for controlling the operation of the test gas path device and the acquisition and processing of data, the test gas path device comprises a gas source tank, a stop valve, a pressure regulator, an emergency cut-off valve, a first control valve, a second control valve, a third control valve, a balance tank, a standard volume tank, a differential pressure sensor and an exhaust valve, the gas source tank, the stop valve, the pressure regulator, the emergency cut-off valve, the first control valve, the balance tank, the standard volume tank, the third control valve and the tested valve are connected in series, the balance tank is provided with the second control valve and the second temperature sensor, the first pressure sensor and the first temperature sensor are arranged on the balance tank, the first emergency cut-off valve and the first control valve are arranged on a branch pipeline, the emergency cut-off valve and the differential pressure sensor is connected with the differential pressure sensor and the differential pressure sensor, the differential pressure sensor is arranged on the differential pressure sensor and the differential pressure sensor is connected with one end of the differential pressure sensor, the differential pressure sensor and the differential pressure sensor is connected with the data display computer, the differential pressure sensor and the PLC computer control system is connected with one end of the data display and the data display system.
The balance tank and the standard volume tank are pressure storage tanks with the same volume, the volume is 1-5L, the used material is a stainless steel material with the brand SUS304 or SUS316, the inner wall is polished, the left end socket and the right end socket are welded in a concave-convex butt joint mode, and the inner wall is ensured not to hang water and liquid. Preferably, the volumes of the balance tank and the standard volume tank and the additional volumes of the respective pipelines are obtained by a bell jar dry standard method (comparison method).
The first pressure sensor and the second pressure sensor adopt 0.04-level absolute pressure transmitters.
The first temperature sensor and the second temperature sensor are Pt1000 platinum thermal resistors, the number of the temperature sensors on each tank is not less than 3, and the distribution principle is equal volume distribution.
The emergency shut-off valve adopts a 0.04-level absolute pressure transmitter.
The heat exchange cover is used for surrounding a first control valve, a balance tank, a second control valve, a standard volume tank, a third control valve and a tested valve in the device, and is of a metal structure, and fins or thin-wall tubes are distributed on the surface of the heat exchange cover.
The switch handles of the first control valve, the second control valve and the third control valve are arranged in the heat exchange cover through extension bars, and the switch handles of the first control valve, the second control valve and the third control valve are provided with on/off signals to be output to a control system.
The working principle of the invention is as follows: the high-pressure gas or nitrogen in the gas source tank enters the pressure regulator through the stop valve, the gas after pressure reduction enters the balance tank and the standard volume tank through the emergency stop valve and the first control valve, the second control valve controls the balance tank and the standard volume tank to be cut off, and the gas in the standard volume tank enters the tested valve through the third control valve. After the test is finished or under emergency, the gas in the tank body can be discharged through the exhaust valve on the bifurcation pipeline between the emergency cut-off valve and the first control valve. Meanwhile, the gas of the test pipeline enters a driving pressure unit on the pressure regulator to control the opening of the pressure regulator, so that the pressure and the flow of the test pipeline are regulated. The test pipeline connection can be threaded connection and flange connection.
The test method adopted based on the test device is described in further detail with reference to fig. 1: the valve leakage amount testing method under the high-low temperature environment is based on a pVTt method gas flow calculation method under the positive pressure condition. The specific implementation steps are as follows.
(1) The tested valve is connected with the testing device, under the room temperature condition, the stop valve, the emergency stop valve, the first control valve and the second control valve are opened, the third control valve is closed, and the control system adjusts the pressure regulator to enable the standard volume tank to be at the pressure p v1 ，p v1 For the first pressure not too high, the second control valve is closed, and the real-time temperature T of the standard volume tank is recorded v1 The control valve III is opened, and the real-time pressure p of the standard volume tank is recorded in a short time (less than 20 s) v2 And temperature T v2 . According to the volume V of the standard volume tank b And the relation of an ideal gas state equation, calculating the total volume V of the standard volume tank, the tested valve and the accessory pipeline t 。
(2) If necessary at a plurality of different pressures p v1 The test was performed multiple times with the average of the total volumes of the multiple times taken as the final total volume.
(3) Under the high-low temperature environment, a stop valve, an emergency stop valve, a first control valve and a second control valve are opened, and the control system adjusts the pressure regulator to enable the pressure of the balance tank to be the test pressure p t Closing control valve one and emergencyThe cut-off valve opens the exhaust valve to exhaust, and records the real-time pressure p of the balance tank 1 And temperature T 1 For a certain time t 1 Thereafter, the leakage q of the balance tank is calculated 1 。
Wherein: v (V) p Is the volume of the balance tank in the standard state; t is t 1 The test time; p is p t 、p 1 、p n The absolute pressure of the medium in the balance tank before and after valve closing and the absolute pressure of the gas in the standard state are respectively; t (T) t 、T 1 、T n The thermodynamic temperature of the medium in the balance tank before and after valve closing and the thermodynamic temperature of the gas in the standard state are respectively; z t 、z n The gas compression coefficients of the medium in the balance tank before and after valve closing and the gas compression coefficient of the medium in the standard state are respectively; alpha is the linear expansion coefficient of the balance tank material.
(4) Under the high-low temperature environment, a stop valve, an emergency stop valve, a first control valve and a second control valve are opened, a third control valve is closed, and a control system adjusts a pressure regulator to enable the pressure of the standard volume tank to be the test pressure p t Closing the second control valve and the emergency stop valve, opening the exhaust valve to exhaust, and recording the real-time pressure p of the standard volume tank 2 And temperature T 2 For a certain time t 2 Thereafter, the leakage q of the standard can is calculated 2 。
Wherein: v (V) b Is the volume of the standard volume tank in the standard state; t is t 2 The test time; p is p t 、p 2 、p n The absolute pressure of the medium in the standard volume tank before and after valve closing and the absolute pressure of the gas in the standard state are respectively; t (T) t 、T 2 、T n Heating power of medium in standard volume tank before and after valve closingThe chemical temperature and the thermodynamic temperature of the medium in a standard state; z t 、z n The gas compression coefficients of the medium in the standard volume tank before and after valve closing and the gas compression coefficient of the medium in the standard state are respectively; alpha is the linear expansion coefficient of the standard volume tank material.
(5) According to the leakage quantity index q of the valve to be tested b Confirming leakage q of balance tank and standard volume tank 1 And q 2 Whether or not it is less than 0.01q b 。
(6) Under the high-low temperature environment, a stop valve, an emergency stop valve, a first control valve, a second control valve and a third control valve are opened, and a control system adjusts a pressure regulator to enable the pressure of the standard volume tank to be the test pressure p t And closing the first control valve and the emergency shut-off valve, and opening the exhaust valve to exhaust.
(7) And monitoring a differential pressure sensor and temperature sensors on the two tanks, when the differential pressure and the temperature difference are negligible (< 0.1 ℃), considering that the system is balanced, closing a control valve II, opening stop valves at two ends of the differential pressure sensor, recording the real-time differential pressure deltap of the differential pressure sensor, and calculating the leakage q of the valve to be tested after a certain time t.
Wherein: v (V) t The total volume of the standard volume tank, the valve to be tested and the auxiliary pipeline in the standard state; t is the test time; Δp real-time differential pressure; t (T) t 、T n Respectively the thermodynamic temperature of the medium in the standard volume tank and the thermodynamic temperature of the medium in the standard state; z t 、z n The gas compression coefficient of the medium in the standard volume tank and the gas compression coefficient of the medium in the standard state are respectively; alpha is the linear expansion coefficient of the standard volume tank material.
Finally, the invention adopts the mature products and the mature technical means in the prior art.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While obvious variations or modifications are contemplated as falling within the scope of the present invention.
Claims (10)
1. The utility model provides a valve leakage test system under high low temperature environment, includes test gas circuit device and control system, its characterized in that: the test gas circuit device comprises a gas source tank, a stop valve, a pressure regulator, an emergency stop valve, a first control valve, a second control valve, a third control valve, a balance tank, a standard volume tank, a differential pressure sensor and an exhaust valve, wherein the gas source tank, the stop valve, the pressure regulator, the emergency stop valve, the first control valve, the balance tank, the standard volume tank, the third control valve and the tested valve are connected in series, the second control valve is installed on a connecting pipeline between the balance tank and the standard volume tank, the balance tank and the standard volume tank are connected with a pressure sensor and a temperature sensor, one end of the differential pressure sensor is located on the balance tank, the other end of the differential pressure sensor is located on the standard volume tank, the exhaust valve is installed on a bifurcation pipeline between the emergency stop valve and the first control valve, and the control system is connected with the pressure regulator, the emergency stop valve, the exhaust valve, the pressure sensor, the temperature sensor and the differential pressure sensor through a data acquisition module, so that data signals are transmitted, and opening/closing signals of the first control valve and the third control valve are output to the control system.
2. A method for testing a valve leakage testing system in a high and low temperature environment according to claim 1, wherein: the method comprises the following steps:
(A1) The tested valve is connected with the test system, under the condition of room temperature, the stop valve, the emergency stop valve, the first control valve and the second control valve are opened, the third control valve is closed, and the control system adjusts the pressure regulator to enable the standard volume tank to be at the pressure p v1 ，p v1 For the first pressure not too high, the second control valve is closed, and the real-time temperature T of the standard volume tank is recorded v1 Opening the control valve III, and recording the real-time pressure p of the standard volume tank v2 And temperature T v2 According to the volume V of the standard volume tank b And the relation of an ideal gas state equation, calculating the total volume V of the standard volume tank, the tested valve and the accessory pipeline t
(A2) Under the high-low temperature environment, a stop valve, an emergency stop valve, a first control valve and a second control valve are opened, and the control system adjusts the pressure regulator to enable the pressure of the balance tank to be the test pressure p t Closing the first control valve and the emergency stop valve, opening the exhaust valve to exhaust, and recording the real-time pressure p of the balance tank 1 And temperature T 1 For a certain time t 1 Thereafter, the leakage q of the balance tank is calculated 1
Wherein: v (V) p Is the volume of the balance tank in the standard state; t is t 1 The test time; p is p t 、p 1 、p n The absolute pressure of the medium in the balance tank before and after valve closing and the absolute pressure of the gas in the standard state are respectively; t (T) t 、T 1 、T n The thermodynamic temperature of the medium in the balance tank before and after valve closing and the thermodynamic temperature of the gas in the standard state are respectively; z t 、z n The gas compression coefficients of the medium in the balance tank before and after valve closing and the gas compression coefficient of the medium in the standard state are respectively; alpha is the linear expansion coefficient of the balance tank material;
(A3) Under the high-low temperature environment, a stop valve, an emergency stop valve, a first control valve and a second control valve are opened, a third control valve is closed, and a control system adjusts a pressure regulator to enable the pressure of the standard volume tank to be the test pressure p t Closing the second control valve and the emergency stop valve, opening the exhaust valve to exhaust, and recordingRecording the real-time pressure p of a standard volume tank 2 And temperature T 2 For a certain time t 2 Thereafter, the leakage q of the standard can is calculated 2
Wherein: v (V) b Is the volume of the standard volume tank in the standard state; t is t 2 The test time; p is p t 、p 2 、p n The absolute pressure of the medium in the standard volume tank before and after valve closing and the absolute pressure of the gas in the standard state are respectively; t (T) t 、T 2 、T n The thermodynamic temperature of the medium in the standard volume tank before and after valve closing and the thermodynamic temperature of the medium in the standard state are respectively; z t 、z n The gas compression coefficients of the medium in the standard volume tank before and after valve closing and the gas compression coefficient of the medium in the standard state are respectively; alpha is the linear expansion coefficient of the standard volume tank material;
(A4) According to the leakage quantity index q of the valve to be tested b Confirming leakage q of balance tank and standard volume tank 1 And q 2 Whether or not it is less than 0.01q b ；
(A5) Under the high-low temperature environment, a stop valve, an emergency stop valve, a first control valve, a second control valve and a third control valve are opened, and a control system adjusts a pressure regulator to enable the pressure of the standard volume tank to be the test pressure p t Closing the first control valve and the emergency stop valve, and opening the exhaust valve to exhaust;
(A6) Monitoring a differential pressure sensor and temperature sensors on two tanks, when the differential pressure and the temperature difference are less than 0.1 ℃ and the system is considered to be balanced, closing a control valve II, opening stop valves at two ends of the differential pressure sensor, recording the real-time differential pressure deltap of the differential pressure sensor, and after a certain time t, calculating the leakage q of the valve to be tested
Wherein: v (V) t The total volume of the standard volume tank, the valve to be tested and the auxiliary pipeline in the standard state; t is the test time; Δp real-time differential pressure; t (T) t 、T n Respectively the thermodynamic temperature of the medium in the standard volume tank and the thermodynamic temperature of the medium in the standard state; z t 、z n The gas compression coefficient of the medium in the standard volume tank and the gas compression coefficient of the medium in the standard state are respectively; alpha is the linear expansion coefficient of the standard volume tank material.
3. The valve leakage test system in a high and low temperature environment according to claim 1, wherein: the control system is a PLC computer control system.
4. The valve leakage test system in a high and low temperature environment according to claim 1, wherein: and a tee joint is arranged between the emergency cut-off valve and the first control valve and is connected with an exhaust valve.
5. The valve leakage test system in a high and low temperature environment according to claim 1, wherein: the balance tank and the standard volume tank are pressure storage tanks with the same volume, and the volume is 1-5L.
6. The valve leakage test system in a high and low temperature environment according to claim 1, wherein: the pressure sensor is a 0.04-level absolute pressure transmitter.
7. The valve leakage test system in a high and low temperature environment according to claim 1, wherein: the differential pressure sensor is a 0.04-level absolute pressure transmitter, and independent stop valves are arranged on pipelines connected with the balance tank and the standard volume tank.
8. The valve leakage test system in a high and low temperature environment according to claim 1, wherein: the temperature sensor is a Pt1000 platinum thermal resistor.
9. The valve leakage test system in a high and low temperature environment according to claim 1, wherein: the control valve I, the balance tank, the control valve II, the standard volume tank, the control valve III and the valve to be tested are surrounded by a heat exchange cover, the heat exchange cover is of a metal structure, and fins or thin-wall tubes are distributed on the surface of the heat exchange cover.
10. The valve leakage test system in a high and low temperature environment according to claim 1, wherein: the switch handles of the first control valve, the second control valve and the third control valve are arranged in the heat exchange cover through extension bars, and the switch handles are provided with on/off signals to be output to the control system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310533667.7A CN116609008A (en) | 2023-05-12 | 2023-05-12 | Valve leakage testing system and method in high-low temperature environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310533667.7A CN116609008A (en) | 2023-05-12 | 2023-05-12 | Valve leakage testing system and method in high-low temperature environment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116609008A true CN116609008A (en) | 2023-08-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310533667.7A Pending CN116609008A (en) | 2023-05-12 | 2023-05-12 | Valve leakage testing system and method in high-low temperature environment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116609008A (en) |
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2023
- 2023-05-12 CN CN202310533667.7A patent/CN116609008A/en active Pending
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