CN112484937B - Valve sealing performance testing method - Google Patents
Valve sealing performance testing method Download PDFInfo
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- CN112484937B CN112484937B CN202011129372.6A CN202011129372A CN112484937B CN 112484937 B CN112484937 B CN 112484937B CN 202011129372 A CN202011129372 A CN 202011129372A CN 112484937 B CN112484937 B CN 112484937B
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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
-
- 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
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/12—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing elastic covers or coatings, e.g. soapy water
- G01M3/14—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing elastic covers or coatings, e.g. soapy water for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
- G01M3/144—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing elastic covers or coatings, e.g. soapy water for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for valves
Abstract
The invention discloses a valve tightness testing method, relates to the technical field of valve tightness testing, and aims to solve the problems that the existing testing method is difficult to find in time and can seriously affect the testing result under the condition that the tightness of a preset ball valve is in a problem. The method comprises the following steps: before detecting, prepare a standard gas holder, one side of gas holder is provided with the air inlet, the air compressor machine is installed to the one end of air inlet, the air compressor machine communicates with each other with the air inlet, and sealing connection, install gas pressure sensor on the outer wall of air inlet, its model is SIN-P300, a release valve is installed to the upper end of gas holder, and release valve and gas holder sealing connection, the opposite side of gas holder is provided with a detection mouth, the inner wall of detection mouth is provided with the helicitic texture, install the closing cap on the detection mouth, closing cap and detection mouth threaded connection, and the junction is provided with the sealing washer.
Description
Technical Field
The invention relates to the technical field of valve tightness testing, in particular to a valve tightness testing method.
Background
Valves are accessories for pipes used to open and close the pipe, control flow direction, regulate and control parameters of the transport medium. According to their function, they can be classified into shut-off valves, check valves, regulating valves, and the like. The valve is a control part in a fluid conveying system and has the functions of stopping, adjusting, guiding, preventing counter flow, stabilizing pressure, shunting or overflowing and relieving pressure and the like. Valves used in fluid control systems range in variety and size from the simplest shut-off valves to the variety of valves used in extremely complex autonomous systems. The valve can be used to control the flow of various types of fluids such as air, water, steam, etc. The valves are further classified into cast iron valves, cast steel valves, stainless steel valves, and the like according to the material. The existing valve tightness test method generally comprises the steps of arranging a standard tank body, presetting a ball valve at an air inlet of the tank body, installing a valve to be detected at one end of the ball valve, controlling the sealing state of the tank body by the ball valve, obtaining an air pressure value of the tank body in a conventional sealing state and an air pressure value after the valve to be detected is installed, comparing the air pressure value with the air pressure value to obtain a pressure difference, and judging the sealing state of the valve.
However, in the method, when the sealing performance of the preset ball valve is in a problem, the problem is difficult to find in time, and the test result is seriously influenced; therefore, the existing requirements are not met, and a valve tightness testing method is provided for the method.
Disclosure of Invention
The invention aims to provide a valve tightness testing method to solve the problem that the existing detection method provided in the background art is difficult to find in time and can seriously affect the testing result under the condition that the self tightness of a preset ball valve has a problem.
In order to achieve the purpose, the invention provides the following technical scheme: a valve tightness testing method comprises the following steps:
the method comprises the following steps: before detection, preparing a standard gas storage tank, wherein a gas inlet is formed in one side of the gas storage tank, an air compressor is installed at one end of the gas inlet, the air compressor is communicated with the gas inlet and is in sealing connection with the gas inlet, a gas pressure sensor is installed on the outer wall of the gas inlet and is of an SIN-P300 type, a gas release valve is installed at the upper end of the gas storage tank and is in sealing connection with the gas storage tank, a detection port is formed in the other side of the gas storage tank, a threaded structure is arranged on the inner wall of the detection port, a sealing cover is installed on the detection port and is in threaded connection with the detection port, a sealing ring is arranged at the connection position, when detection is conducted, firstly, the interior of the gas storage tank is guaranteed to be in a normal pressure state, then a layer of industrial cleaning agent is smeared at the connection position between the sealing cover and the detection port, then a certain amount of pressure gas is injected into the gas storage tank through the air compressor, and the duration of the injection is calculated;
step two: after the gas injection is finished, recording the data of the gas pressure sensor at the moment, standing for a period of time, recording the data of the pressure gauge again, and after the data recording is finished, discharging the pressure gas in the gas storage tank through the gas release valve to enable the tank to return to the normal pressure state;
step three: detaching a sealing cover on a detection port of the gas storage tank, installing a valve to be detected at the detection port, and restarting the air compressor to inject pressure gas into the gas storage tank;
step four: after the pressure gas is injected, recording the data of the gas pressure sensor at the moment, and after standing for a period of time, recording the data of the pressure gauge again;
step five: comparing the experimental data obtained when the sealing cover is installed with the experimental data obtained when the valve to be detected is installed, measuring the pressure difference between the two experimental data, if the pressure difference has no obvious difference, the tightness of the valve to be detected is qualified, and if the pressure difference data has obvious difference, the tightness of the valve to be detected is indicated to have the tightness problem;
preferably, the sealing ring in the first step is made of rubber, the inner wall of the sealing ring is of a threaded structure, the sealing ring is matched with threads on the detection port and is mounted at the tail end of the detection port in a rotating mode, and the sealing cover is in a state of pressing the sealing ring after being mounted.
Preferably, the industrial cleaning agent in the first step is an environment-friendly hydrocarbon cleaning solvent, the model is FRB-121, and the parameters are as follows, the distillation range is 152-174 ℃, the flash point is 52 ℃, the surface tension is 23 dyn/cm, and the density is 0.75 g/ml.
Preferably, the pressure gas introduced in the first step, the third step and the fifth step is clean nitrogen or air.
Preferably, the time period for injecting the pressure gas in the third step is consistent with the time period calculated in the first step.
Preferably, in the third step, the detection port is connected with the valve to be detected through the reducing rubber joint flange.
Preferably, in the fifth step, when the valve to be detected has a problem of tightness, a layer of industrial cleaning agent can be coated on the position of the valve where leakage is easy to occur, the air compressor is started again to inject air into the air storage tank, and whether bubbles are continuously increased on the valve is observed, so that the leakage position of the valve is visually judged.
Preferably, in the first step, the output end of the gas pressure sensor is connected with the input end of the PLC control module through the transmitter, and the output end of the PLC control module is connected with the input end of the alarm module.
Compared with the prior art, the invention has the beneficial effects that:
1. the sealing cover is arranged at the detection port by replacing the original ball valve, the sealing cover is fixed with the detection port in a threaded connection mode, the disassembly and the assembly are convenient, a sealing ring structure is arranged at the connection position, the sealing ring is made of rubber, the inner wall of the sealing ring is of a threaded structure and is matched with threads on the detection port, the sealing cover is arranged at the tail end of the detection port in a rotating mode, the sealing cover is in a state of pressing the sealing ring after the sealing cover is completely installed, the sealing ring can be tightly attached to the detection port during installation due to the arrangement of the threaded structure, the sealing performance of the connection position is enhanced, when the pressure value of the gas storage tank is detected, a layer of industrial cleaning agent can be coated at the connection position of the sealing cover and the detection port, the type of the industrial cleaning agent coated at the connection position is FRB-121, the sealing cover is an environment-friendly hydrocarbon cleaning solvent, the sealing cover made of metal cannot be corroded, the sealing cover can be completely volatilized, no residue exists, when pressure gas is injected, if the sealing performance of the connection position is poor, bubbles which are increased continuously, and the situation that the sealing effect is difficult to occur under the situation that the sealing performance of the existing sealing assembly is found in time is seriously influenced is avoided.
2. Through adopting the industry cleaner to paint in the part that the valve is easy to take place to reveal, when the injection pressure is gaseous, if the valve takes place to leak, the bubble of continuous increase can appear in the part of then painting the industry cleaner to conveniently judge the leakage site of valve, compare with conventional soapy water, the industry cleaner pertinence is stronger, can choose the industry cleaner of adaptation model for use according to the material of valve, avoid causing the corruption to the valve, and this type of solvent is volatile, has avoided secondary pollution.
3. The detection port is connected with the flange of the valve to be detected through the reducing rubber joint, and the size of the reducing rubber joint is changed to be connected with the valve with the adaptive size, so that the detection is not limited by the size of the valve easily, and the universality of the detection method is improved.
4. The output end of the gas pressure sensor is connected with the input end of the PLC control module through the transmitter, the output end of the PLC control module is connected with the input end of the alarm module, and therefore a set of overpressure alarm system is formed.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example 1
A valve tightness testing method comprises the following steps:
the method comprises the following steps: before detection, preparing a standard gas storage tank, wherein the size of the standard gas storage tank is 32 cm in diameter and 68 cm in height, one side of the gas storage tank is provided with a gas inlet, one end of the gas inlet is provided with an air compressor, the air compressor is communicated with the gas inlet and is in sealing connection with the gas inlet, the outer wall of the gas inlet is provided with a gas pressure sensor, the type of the gas pressure sensor is SIN-P300, a pressure gauge is 0.4 grade, the upper end of the gas storage tank is provided with a gas release valve, the gas release valve is in sealing connection with the gas storage tank and is used for automatically discharging redundant gas in the tank to avoid potential safety hazards caused by overlarge pressure in the gas storage tank, the other side of the gas storage tank is provided with a detection port, the inner wall of the detection port is provided with a threaded structure, the detection port is provided with a sealing cover, the sealing cover is in threaded connection with the detection port, a sealing ring is arranged at the connection, during detection, firstly, the interior of the gas storage tank is ensured to be in a normal pressure state, then a layer of industrial cleaning agent is coated at the connection position between the sealing cover and the detection port, 5L pressure gas is injected into the gas storage tank through the air compressor, and the time length used for the injection is calculated;
step two: after the gas injection is finished, recording the data of the gas pressure sensor at the moment, standing for 5 minutes, recording the data of the pressure gauge again, and after the data recording is finished, discharging the pressure gas in the gas storage tank through the gas release valve to enable the tank to return to the normal pressure state;
step three: detaching a sealing cover on a detection port of the gas storage tank, installing a stainless steel valve to be detected at the detection port, and starting the air compressor again to inject pressure gas into the gas storage tank;
step four: after the pressure gas is injected, recording the data of the gas pressure sensor at the moment, standing for 5 minutes in the same way, and recording the data of the pressure gauge again;
step five: comparing the experimental data obtained when the sealing cover is installed with the experimental data obtained when the valve to be detected is installed, measuring the pressure difference between the two experimental data, if the pressure difference has no obvious difference, the tightness of the stainless steel valve to be detected is qualified, and if the pressure difference data has obvious difference, the tightness of the stainless steel valve to be detected is judged to be in problem;
further, the sealing washer in step one is the rubber material, and its inner wall is thread structure, and with the screw thread adaptation on the detection mouth, install in detection mouth end through rotatory mode, the closing cap is in the state that compresses tightly the sealing washer after the installation finishes, through setting up the screw thread at rubber seal's inner wall, can install when the installation with detect the inseparabler of mouthful laminating, and make things convenient for the dismouting, strengthened the leakproofness of junction.
Further, the industrial cleaning agent in the first step is an environment-friendly hydrocarbon cleaning solvent with the model number of FRB-121, and the parameters are that the distillation range is 152-174 ℃, the flash point is 52 ℃, the surface tension is 23 dyn/cm, and the density is 0.75 g/ml.
Furthermore, the pressure gas introduced in the first step, the third step and the fifth step is clean nitrogen or air, so that the pollution to the interior of the tank body is avoided.
Further, the time duration for injecting the pressure gas in the third step is consistent with the time duration calculated in the first step, so that the test result is more accurate.
Furthermore, in the third step, the detection port is connected with the valve to be detected through the reducing rubber joint flange, so that the method is suitable for detection of valves with various sizes, and the universality of the detection method is improved.
Further, in the fifth step, when the stainless steel valve to be detected has a tightness problem, a layer of industrial cleaning agent can be coated at the position of the valve easy to leak, the industrial cleaning agent is a halogen-free hydrocarbon solvent type stainless steel cleaning agent, the model is FRB-111, the parameters are as follows, the distillation range is 152-190 ℃, the flash point is 48 ℃, the surface tension is 22 dyn/cm, and the density is 0.75 g/ml, so that the stainless steel valve detected at this time cannot be corroded, and is volatile, secondary pollution is avoided, then the air compressor is started again to inject air into the air storage tank, and whether the air compressor is continuously increased or not is observed, so that the leakage position of the valve is visually judged, and the subsequent maintenance or the improvement of a product is facilitated.
Furthermore, in the first step, the output end of the gas pressure sensor is connected with the input end of the PLC control module through the transmitter, the output end of the PLC control module is connected with the input end of the alarm module, an overpressure alarm system is formed, when the increasing speed of the gas pressure in the tank exceeds the exhaust speed of the gas escape valve, and overpressure in the tank is caused, the gas pressure sensor can send detection information to the PLC control module, the PLC control module drives the alarm module to give an alarm, and a worker is reminded of closing the equipment, so that the safety of the whole set of equipment during testing is improved.
Example 2
A valve tightness test method comprises the following steps:
the method comprises the following steps: before detection, preparing a standard gas storage tank, wherein the size of the standard gas storage tank is 32 cm in diameter and 68 cm in height, one side of the gas storage tank is provided with a gas inlet, one end of the gas inlet is provided with an air compressor, the air compressor is communicated with the gas inlet and is in sealing connection with the gas inlet, the outer wall of the gas inlet is provided with a gas pressure sensor, the type of the gas pressure sensor is SIN-P300, a pressure gauge is 0.4 grade, the upper end of the gas storage tank is provided with a gas release valve, the gas release valve is in sealing connection with the gas storage tank and is used for automatically discharging redundant gas in the tank to avoid potential safety hazards caused by overlarge pressure in the gas storage tank, the other side of the gas storage tank is provided with a detection port, the inner wall of the detection port is provided with a threaded structure, the detection port is provided with a sealing cover, the sealing cover is in threaded connection with the detection port, a sealing ring is arranged at the connection, during detection, firstly, the interior of the gas storage tank is ensured to be in a normal pressure state, then a layer is coated on the connection with an industrial cleaning agent at the connection position, whether leakage phenomenon is judged, 10L is injected into the gas storage tank through the air compressor, and the time length used for the injection is calculated;
step two: after the gas injection is finished, recording the data of the gas pressure sensor at the moment, standing for 8 minutes, recording the data of the pressure gauge again, and after the data recording is finished, discharging the pressure gas in the gas storage tank through the gas release valve to enable the tank to return to the normal pressure state;
step three: detaching a sealing cover on a detection port of the gas storage tank, installing a plastic valve to be detected at the detection port, and starting the air compressor again to inject pressure gas into the gas storage tank;
step four: after the pressure gas is injected, recording the data of the gas pressure sensor at the moment, standing for 8 minutes in the same way, and recording the data of the pressure gauge again;
step five: comparing the experimental data obtained when the sealing cover is installed with the experimental data obtained when the valve to be detected is installed, measuring the pressure difference between the two experimental data, if the pressure difference has no obvious difference, the sealing performance of the plastic valve to be detected is qualified, and if the pressure difference data has obvious difference, the sealing performance of the plastic valve to be detected is in problem;
further, the sealing washer in step one is the rubber material, and its inner wall is thread structure, and with the screw thread adaptation on the detection mouth, install in detection mouth end through rotatory mode, the closing cap is in the state that compresses tightly the sealing washer after the installation finishes, through setting up the screw thread at rubber seal's inner wall, can install when the installation with detect the inseparabler of mouthful laminating, and make things convenient for the dismouting, strengthened the leakproofness of junction.
Further, the industrial cleaning agent in the first step is an environment-friendly hydrocarbon cleaning solvent with the model number of FRB-121, and the parameters are that the distillation range is 152-174 ℃, the flash point is 52 ℃, the surface tension is 23 dyn/cm, and the density is 0.75 g/ml.
Furthermore, the pressure gas introduced in the first step, the third step and the fifth step is clean nitrogen or air, so that the pollution to the interior of the tank body is avoided.
Furthermore, the time duration for injecting the pressure gas in the third step is consistent with the time duration calculated in the first step, so that the test result is more accurate.
Furthermore, in the third step, the detection port is connected with the valve to be detected through the reducing rubber joint flange, so that the method is suitable for detection of valves with various sizes, and the universality of the detection method is improved.
Further, in the fifth step, when the plastic valve to be detected has a problem of tightness, a layer of industrial cleaning agent can be coated at the position where the valve is easy to leak, the industrial cleaning agent is a solvent-type plastic cleaning agent, the model is FRB-663, the density of the industrial cleaning agent is 0.65-0.7 g/ml, the industrial cleaning agent is high in drying speed and volatile, the valve made of the plastic cannot be corroded, secondary pollution is avoided, then the air compressor is started again to inject air into the air storage tank, whether bubbles which are increased continuously exist on the valve or not is observed, and therefore the leakage position of the valve is judged visually, and subsequent maintenance or product improvement is facilitated.
Further, in step one, the output of gas pressure sensor passes through the changer and is connected with PLC control module's input, PLC control module's output and alarm module's input are connected, one set of superpressure alarm system has been constituted, the exhaust speed that the increase rate of atmospheric pressure surpassed the snuffle valve in jar, when leading to jar interior superpressure, gas pressure sensor can send detected information to PLC control module, send out the police dispatch newspaper by PLC control module drive alarm module, remind the staff to close equipment, security when improving the test of whole equipment.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (8)
1. A valve tightness testing method is characterized by comprising the following steps:
the method comprises the following steps: before detection, preparing a standard gas storage tank, wherein a gas inlet is formed in one side of the gas storage tank, an air compressor is installed at one end of the gas inlet, the air compressor is communicated with the gas inlet and is in sealing connection with the gas inlet, a gas pressure sensor is installed on the outer wall of the gas inlet and is of an SIN-P300 type, a gas release valve is installed at the upper end of the gas storage tank and is in sealing connection with the gas storage tank, a detection port is formed in the other side of the gas storage tank, a threaded structure is arranged on the inner wall of the detection port, a sealing cover is installed on the detection port and is in threaded connection with the detection port, a sealing ring is arranged at the connection position, when detection is conducted, firstly, the interior of the gas storage tank is guaranteed to be in a normal pressure state, then a layer of industrial cleaning agent is smeared at the connection position between the sealing cover and the detection port, then a certain amount of pressure gas is injected into the gas storage tank through the air compressor, and the duration of the injection is calculated;
step two: after the gas injection is finished, the data of the gas pressure sensor at the moment are recorded, after the standing is carried out for a period of time, the data of the pressure gauge are recorded again, and after the data recording is finished, the pressure gas in the gas storage tank is discharged through the gas release valve, so that the tank returns to the normal pressure state;
step three: detaching a sealing cover on a detection port of the gas storage tank, installing a valve to be detected at the detection port, and starting the air compressor again to inject pressure gas into the gas storage tank;
step four: after the pressure gas is injected, recording the data of the gas pressure sensor at the moment, and after standing for a period of time, recording the data of the pressure gauge again;
step five: and comparing the experimental data obtained when the sealing cover is installed with the experimental data obtained when the valve to be detected is installed, measuring the pressure difference between the experimental data and the pressure difference, wherein if the pressure difference has no obvious difference, the tightness of the valve to be detected is qualified, and if the pressure difference data has obvious difference, the tightness problem of the valve to be detected is indicated.
2. The valve tightness testing method according to claim 1, wherein: the sealing ring in the first step is made of rubber, the inner wall of the sealing ring is of a threaded structure and is matched with threads on the detection port, the sealing ring is installed at the tail end of the detection port in a rotating mode, and the sealing cover is in a state of pressing the sealing ring after the sealing ring is installed.
3. The valve tightness testing method according to claim 1, wherein: the industrial cleaning agent in the first step is an environment-friendly hydrocarbon cleaning solvent with the model number of FRB-121, and the parameters are as follows, the distillation range is 152-174 ℃, the flash point is 52 ℃, the surface tension is 23 dyn/cm, and the density is 0.75 g/ml.
4. The valve tightness testing method according to claim 1, wherein: and the pressure gas introduced in the first step, the third step and the fifth step is clean nitrogen or air.
5. The valve tightness testing method according to claim 1, wherein: the time period for injecting the pressure gas in the third step is consistent with the time period calculated in the first step.
6. The valve tightness testing method according to claim 1, wherein: and in the third step, the detection port is connected with the valve to be detected through the reducing rubber joint flange.
7. The valve tightness testing method according to claim 1, wherein: in the fifth step, when the valve to be detected has the problem of tightness, a layer of industrial cleaning agent can be coated on the position of the valve easy to leak, the air compressor is started again to inject air into the air storage tank, and whether the valve has continuously increased bubbles or not is observed, so that the leaking position of the valve is visually judged.
8. The valve tightness testing method according to claim 1, wherein: in the first step, the output end of the gas pressure sensor is connected with the input end of the PLC control module through the transmitter, and the output end of the PLC control module is connected with the input end of the alarm module.
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| CN202011129372.6A CN112484937B (en) | 2020-10-21 | 2020-10-21 | Valve sealing performance testing method |
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| CN202011129372.6A CN112484937B (en) | 2020-10-21 | 2020-10-21 | Valve sealing performance testing method |
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| CN112484937B true CN112484937B (en) | 2022-12-13 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104865026A (en) * | 2015-04-12 | 2015-08-26 | 中国计量学院 | Polyethylene valve sealing performance room temperature low pressure test method |
| CN206248296U (en) * | 2016-11-04 | 2017-06-13 | 孙秀 | One kind is used for gas meter, flow meter ball valve air-tightness pressure detecting instrument |
| CN107228745A (en) * | 2017-07-14 | 2017-10-03 | 深圳市高晟智能装备有限公司 | A kind of ball valve air tightness testing method and test system |
| CN208239037U (en) * | 2018-04-28 | 2018-12-14 | 河南航天液压气动技术有限公司 | A kind of valve seal device for detecting performance |
| CN210774569U (en) * | 2019-08-27 | 2020-06-16 | 李治涛 | Sealing detection device of safety valve |
-
2020
- 2020-10-21 CN CN202011129372.6A patent/CN112484937B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104865026A (en) * | 2015-04-12 | 2015-08-26 | 中国计量学院 | Polyethylene valve sealing performance room temperature low pressure test method |
| CN206248296U (en) * | 2016-11-04 | 2017-06-13 | 孙秀 | One kind is used for gas meter, flow meter ball valve air-tightness pressure detecting instrument |
| CN107228745A (en) * | 2017-07-14 | 2017-10-03 | 深圳市高晟智能装备有限公司 | A kind of ball valve air tightness testing method and test system |
| CN208239037U (en) * | 2018-04-28 | 2018-12-14 | 河南航天液压气动技术有限公司 | A kind of valve seal device for detecting performance |
| CN210774569U (en) * | 2019-08-27 | 2020-06-16 | 李治涛 | Sealing detection device of safety valve |
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| CN112484937A (en) | 2021-03-12 |
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