CN111735588B - Delivery test device and method for breather valve - Google Patents
Delivery test device and method for breather valve Download PDFInfo
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- CN111735588B CN111735588B CN202010798087.7A CN202010798087A CN111735588B CN 111735588 B CN111735588 B CN 111735588B CN 202010798087 A CN202010798087 A CN 202010798087A CN 111735588 B CN111735588 B CN 111735588B
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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
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
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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
- G01M13/00—Testing of machine parts
- G01M13/003—Machine valves
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Abstract
The invention discloses a delivery test device and method for a breather valve, and aims to overcome the defects of complex structure, high cost and inconvenient test operation of breather valve test equipment. The device comprises a pressure stabilizing tank, a detection tank and a vacuum pump, wherein an air supply pipe and an air supply pipe are connected to the pressure stabilizing tank, the air supply pipe is connected with the detection tank, the air supply pipe is connected with a workshop air source, a main control electromagnetic valve and an air supply electromagnetic valve are installed on the air supply pipe, a microflow tubule is connected between two ends of the air supply electromagnetic valve in parallel, a leakage electromagnetic valve and a micro flow meter are installed on the microflow tubule, the vacuum pump is connected on the air supply pipe in parallel, a pressure detector is installed on the detection tank, and a test interface for installing a breather valve is arranged on the detection tank. The delivery test device for the breather valve is simple in structure, low in cost and convenient to test and operate.
Description
Technical Field
The invention relates to a valve test device, in particular to a delivery test device and method for a breather valve.
Background
The breather valve can ensure that the storage tank space is isolated from the atmosphere within a certain pressure range and can be communicated with the atmosphere when the pressure exceeds or is lower than the pressure range, and the breather valve has the functions of preventing the storage tank from being damaged due to overpressure or vacuum and reducing the evaporation loss of the stored liquid. The breather valve needs to be subjected to a factory test before being delivered from a factory so as to ensure that all performances meet the design requirements. At present, most of air compression equipment is adopted for testing, the equipment structure is complex, the cost is high, and the test operation is inconvenient.
Disclosure of Invention
The invention overcomes the defects of complex structure, high cost and inconvenient test operation of the breather valve test equipment, and provides a breather valve delivery test device and a method, which have simple structure, low cost and convenient test operation.
In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides a breather valve test device that dispatches from factory, includes surge tank, detects jar, vacuum pump, connects air supply pipe, air feed pipe on the surge tank, and the air feed pipe is connected with detecting the jar, and the workshop air supply is connected to the air supply pipe, installs master control solenoid valve on the air feed pipe, the solenoid valve of ventilating, parallelly connected miniflow tubule between the solenoid valve both ends of ventilating, installation leakage solenoid valve, miniature flowmeter on the miniflow tubule, and the vacuum pump is parallelly connected on the air feed pipe, and installation pressure detector on the detection jar is equipped with the test interface that is used for installing the breather valve on the detection jar.
The delivery test device of the breather valve can carry out leakage quantity detection test, positive pressure opening pressure test and negative pressure opening pressure test on the breather valve. The breather valve is mounted to a test port on the test canister prior to testing. When leakage amount detection test is carried out, the main control electromagnetic valve and the ventilation electromagnetic valve are opened, the leakage electromagnetic valve is closed, a workshop air source supplies air to the pressure stabilizing tank through the air supply pipe, the air source enters the detection tank through the main control electromagnetic valve and the ventilation electromagnetic valve, the pressure in the pressure stabilizing tank and the detection tank is controlled, the pressure is guaranteed to be higher than 0.75 times of positive pressure opening pressure and lower than the positive pressure opening pressure, then the ventilation electromagnetic valve is closed, the leakage electromagnetic valve is opened, the flow value of the micro flowmeter is read, and the leakage amount in unit time is obtained. The main control solenoid valve, the solenoid valve of ventilating open the pressure test time of malleation open, the leakage solenoid valve is closed, and the workshop air supply passes through the air supply pipe and supplies gas in to the surge tank, and the air supply is through main control solenoid valve, the solenoid valve of ventilating gets into and detects the jar, and pressure slowly risees, observes the pressure value that detects the pressure detector on the jar, and when pressure detector's pressure value stabilized at a certain pressure value, the malleation valve disc of breather valve was stably opened, and this pressure value is the malleation open pressure value of being surveyed the breather valve. When the negative pressure opening pressure test is carried out, the ventilation electromagnetic valve is opened, the leakage electromagnetic valve is closed, the main control electromagnetic valve acts to enable the vacuum pump to be communicated with the air supply pipe, the air supply pipe is cut off from the pressure stabilizing tank, the vacuum pump is opened to vacuumize the detection tank, and the pressure value of the pressure detector on the detection tank is observed when the negative pressure valve disc of the breather valve is opened, wherein the pressure value is the negative pressure opening pressure of the breather valve. The factory test device of the breather valve directly adopts a workshop air source to supply air, so that the equipment is simplified, and the cost is reduced. Because the standard requires that the leakage quantity is very little, connect the miniflow tubule between the solenoid valve both ends of ventilating in parallel to form small bypass passageway, the miniature flowmeter of being convenient for detects the leakage quantity of miniflow, improves and detects the precision. The pressure stabilizing tank is favorable for stabilizing the pressure and improving the accuracy of the test. The delivery test device for the breather valve is simple in structure, low in cost and convenient to test and operate.
Preferably, the aperture of the air supply pipe is 2 to 5 times of the aperture of the micro-flow tubule. The large pipeline is needed when the pressure test is just started, the leakage amount detection flow is little, and therefore the micro-flow thin tube with a small aperture is arranged, so that the leakage amount can be accurately detected.
Preferably, the air supply pipe is provided with an air supply solenoid valve and a pressure regulating valve. The air supply electromagnetic valve is convenient for controlling the on-off of air supply, and the pressure regulating valve is convenient for regulating the air supply pressure.
Preferably, the pressure-stabilizing tank is provided with a pressure gauge, a temperature sensor and an exhaust electromagnetic valve. The pressure gauge and the temperature sensor are convenient for controlling the pressure and the temperature in the pressure stabilizing tank. The exhaust solenoid valve is convenient for carry out the pressure release to the surge tank.
Preferably, the detection tank is provided with a discharge solenoid valve. The discharge solenoid valve is convenient for carrying out pressure relief on the detection tank.
Preferably, the main control electromagnetic valve is a three-way electromagnetic valve, one end of the three-way electromagnetic valve is connected with the vacuum pump, and the other two ends of the three-way electromagnetic valve are connected with the air supply pipe. The three-way electromagnetic valve is convenient for connecting the vacuum pump.
Preferably, a rotary disc is installed at the position of a test interface on a detection tank, a plurality of butt interfaces with different calibers are arranged on the rotary disc, the butt interfaces can be correspondingly communicated with the test interface along with the rotation of the rotary disc, a plurality of fastening screw rods used for connecting breather valves are uniformly distributed at the edges of the butt interfaces, fastening holes are formed in the two sides of the butt interfaces on the rotary disc, a positioning rod is arranged on the detection tank, the rotary disc can be rotatably sleeved on the positioning rod, a locking nut is connected to the upper end of the positioning rod after the rotary disc is rotated in place, locking screws are fixedly connected in the fastening holes in the two sides of the butt interfaces correspondingly communicated with the test interface, the rotary disc and the detection tank are connected and locked through the locking nut and the locking screws, the breather valves are installed at the positions of the butt interfaces correspondingly communicated with the test interface on the rotary disc, a sealing ring is installed at the edges of the test interface on the detection tank, and a sealing gasket is installed between the breather valves and the rotary disc.
The breather valve is installed on the carousel, selects different butt joints according to the breather valve of different specification and dimension, and the breather valve is connected the fastening with the fastening screw at butt joint edge, then rotates the carousel, makes this butt joint mouth correspond the intercommunication with the test interface on the detection jar, then is connected locking nut and locating lever, and the locking screw is connected with the fastening hole. The rotary table is provided with a plurality of interfaces with different sizes, so that the rotary table is suitable for tests of breather valves with various sizes, and the test operation is flexible and convenient, and the universality is good.
A delivery test method of a breather valve utilizes a delivery test device of the breather valve to carry out tests, including a leakage quantity detection test, a positive pressure opening pressure test and a negative pressure opening pressure test;
leakage amount detection test: the main control electromagnetic valve and the ventilation electromagnetic valve are opened, the leakage electromagnetic valve is closed, a workshop air source supplies air to the pressure stabilizing tank through an air supply pipe, the air source enters the detection tank through the main control electromagnetic valve and the ventilation electromagnetic valve, the pressure in the pressure stabilizing tank and the detection tank is controlled, the pressure is guaranteed to be higher than 0.75 time of positive pressure opening pressure and lower than the positive pressure opening pressure, then the ventilation electromagnetic valve is closed, the leakage electromagnetic valve is opened, the flow value of the micro flowmeter is read, and the leakage amount in unit time is obtained;
positive pressure opening pressure test: opening a main control electromagnetic valve and a ventilation electromagnetic valve, closing a leakage electromagnetic valve, supplying gas to a pressure stabilizing tank through a gas supply pipe from a workshop gas source, slowly increasing the pressure of the gas source entering a detection tank through the main control electromagnetic valve and the ventilation electromagnetic valve, observing the pressure value of a pressure detector on the detection tank, and stably opening a positive pressure valve disc of a breather valve when the pressure value of the pressure detector is stabilized at a certain pressure value, wherein the pressure value is the positive pressure opening pressure value of the measured breather valve;
and (3) negative pressure opening pressure test: the method comprises the steps that a ventilation electromagnetic valve is opened, a leakage electromagnetic valve is closed, a main control electromagnetic valve acts to enable a vacuum pump to be communicated with an air supply pipe, the air supply pipe is cut off from a pressure stabilizing tank, the vacuum pump is opened to vacuumize a detection tank, a negative pressure valve disc of a breather valve is opened, the pressure value of a pressure detector on the detection tank is observed, and the pressure value is the negative pressure opening pressure of the breather valve.
Preferably, when the breather valve is subjected to a factory test, a leakage amount detection test is performed, and then a positive pressure opening pressure test and a negative pressure opening pressure test are performed. Leakage detection test is carried out firstly, and the pressure in the detection tank does not reach the opening pressure of the breather valve at the moment, namely the valve disc of the breather valve is not opened, so that the accuracy of the leakage detection test is ensured. And if the leakage quantity is unqualified, the positive pressure opening pressure test result is also inaccurate, which is beneficial to ensuring the accuracy of the positive pressure opening pressure test result.
Preferably, in the leakage amount detection test, the value of the micro flow meter is measured and read once per minute, and the average value is calculated by testing for a plurality of times. This way the accuracy of the test can be improved.
Compared with the prior art, the invention has the beneficial effects that: the delivery test device of the breather valve has the advantages of simple structure, low cost and convenient test operation.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention;
FIG. 2 is a schematic view of a turntable connection structure according to embodiment 2 of the present invention;
in the figure: 1. pressure stabilizing tank, 2, detection tank, 3, vacuum pump, 4, air supply pipe, 5, air feed pipe, 6, master control solenoid valve, 7, ventilation solenoid valve, 8, microflow tubule, 9, leakage solenoid valve, 10, micro-flowmeter, 11, pressure detector, 12, test interface, 13, air supply solenoid valve, 14, pressure regulating valve, 15, pressure gauge, 16, temperature sensor, 17, exhaust solenoid valve, 18, discharge solenoid valve, 19, breather valve, 20, rotary table, 21, interface, 22, fastening screw, 23, fastening hole, 24, positioning rod, 25, locking nut, 26 and locking screw.
Detailed Description
The technical scheme of the invention is further described in detail by the following specific embodiments in combination with the attached drawings:
example 1: the utility model provides a breather valve test device that dispatches from factory (see attached figure 1), including surge tank 1, detect jar 2, vacuum pump 3, connect air supply pipe 4 on the surge tank, air-feed pipe 5, the air-feed pipe is connected with detecting the jar, the workshop air supply is connected to the air supply pipe, install main control solenoid valve 6 on the air-feed pipe, ventilation solenoid valve 7, parallelly connected miniflow tubule 8 between the ventilation solenoid valve both ends, install leakage solenoid valve 9 on the miniflow tubule, micro-flowmeter 10, the vacuum pump is parallelly connected on the air-feed pipe, install pressure detector 11 on the detection jar, be equipped with the test interface 12 that is used for installing breather valve 19 on the detection jar. The aperture of the air feed pipe is 2-5 times of that of the micro-flow tubule. The air supply pipe is provided with an air supply electromagnetic valve 13 and a pressure regulating valve 14. The pressure stabilizing tank is provided with a pressure gauge 15, a temperature sensor 16 and an exhaust electromagnetic valve 17. The canister is fitted with a drain solenoid valve 18. The main control electromagnetic valve is a three-way electromagnetic valve, one end of the three-way electromagnetic valve is connected with the vacuum pump, and the other two ends of the three-way electromagnetic valve are connected with the air supply pipe. The delivery test device of the breather valve further comprises a controller, wherein the master control electromagnetic valve, the ventilation electromagnetic valve, the leakage electromagnetic valve, the micro flow meter, the vacuum pump, the pressure detector, the air supply electromagnetic valve, the pressure gauge, the temperature sensor, the exhaust electromagnetic valve and the discharge electromagnetic valve are electrically connected with the controller, automatic control and automatic data reading are realized through the controller, and delivery test operation of the breather valve can be automatically completed conveniently.
A delivery test method of a breather valve utilizes a delivery test device of the breather valve to carry out tests, including a leakage quantity detection test, a positive pressure opening pressure test and a negative pressure opening pressure test; the breather valve is installed to a test interface location on the test canister prior to testing.
Leakage amount detection test: the air supply electromagnetic valve, the main control electromagnetic valve and the ventilation electromagnetic valve are opened, the leakage electromagnetic valve is closed, a workshop air source supplies air to the pressure stabilizing tank through an air supply pipe, the air supply pressure is adjusted through the pressure adjusting valve, the air source enters the detection tank through the main control electromagnetic valve and the ventilation electromagnetic valve, the pressure in the pressure stabilizing tank and the detection tank is controlled, the pressure is guaranteed to be higher than 0.75 time of positive pressure opening pressure and lower than the positive pressure opening pressure, then the ventilation electromagnetic valve is closed, the leakage electromagnetic valve is opened, the flow value of the micro flowmeter is read, and the leakage amount in unit time is obtained;
positive pressure opening pressure test: the method comprises the following steps that an air supply solenoid valve, a main control solenoid valve and a ventilation solenoid valve are opened, a leakage solenoid valve is closed, a workshop air source supplies air to a pressure stabilizing tank through an air supply pipe, the air source enters a detection tank through the main control solenoid valve and the ventilation solenoid valve, the pressure slowly rises, the pressure value of a pressure detector on the detection tank is observed, when the pressure value of the pressure detector is stabilized at a certain pressure value, a positive pressure valve disc of a breather valve is stably opened, and the pressure value is the positive pressure opening pressure value of the measured breather valve;
and (3) negative pressure opening pressure test: the method comprises the steps that a ventilation electromagnetic valve is opened, a leakage electromagnetic valve is closed, a main control electromagnetic valve acts to enable a vacuum pump to be communicated with an air supply pipe, the air supply pipe is cut off from a pressure stabilizing tank, the vacuum pump is opened to vacuumize a detection tank, a negative pressure valve disc of a breather valve is opened, the pressure value of a pressure detector on the detection tank is observed, and the pressure value is the negative pressure opening pressure of the breather valve.
When the breather valve is subjected to a factory test, a leakage amount detection test is firstly carried out, and then a positive pressure opening pressure test and a negative pressure opening pressure test are carried out. During the leakage detection test, the numerical value of the micro flowmeter is measured and read once every minute, and the average value is calculated after the test is carried out for many times.
Example 2: a delivery test device for a breather valve (see attached figure 2) is similar to the device in embodiment 1, and mainly has the difference that a rotary disc 20 is arranged at the position of a test interface on a detection tank in the embodiment, the rotary disc is provided with a plurality of interfaces 21 with different apertures, the interfaces can correspondingly communicate with the test interface along with the rotation of the rotary disc, a plurality of fastening screws 22 for connecting the breather valve are uniformly distributed at the edges of the interfaces, fastening holes 23 are respectively arranged at the two sides of the interfaces on the rotary disc, a positioning rod 24 is arranged on the detection tank, the rotary disc is rotatably sleeved on the positioning rod, a locking nut 25 is connected at the upper end of the positioning rod after the rotary disc rotates in place, locking screws 26 are fastened and connected in the fastening holes at the two sides of the interfaces correspondingly communicated with the test interface, the rotary disc is connected and locked with the detection tank through the locking nut and the locking screws, the breather valve is arranged at the position of the interfaces correspondingly communicated with the test interface on the rotary disc, and a sealing ring is arranged at the edge of the test interface on the detection tank, and a sealing gasket is arranged between the breather valve and the turntable. The other structure is the same as embodiment 1.
The breather valve is installed on the carousel, selects different butt joints according to the breather valve of different specification and dimension, and the breather valve is connected the fastening with the fastening screw at butt joint edge, then rotates the carousel, makes this butt joint mouth correspond the intercommunication with the test interface on the detection jar, then is connected locking nut and locating lever, and the locking screw is connected with the fastening hole. The rotary table is provided with a plurality of interfaces with different sizes, so that the rotary table is suitable for breathing valve tests of various sizes, and is flexible and convenient in test operation and good in universality.
The above-described embodiments are merely preferred embodiments of the present invention, which is not intended to be limiting in any way, and other variations and modifications are possible without departing from the scope of the invention as set forth in the appended claims.
Claims (6)
1. A delivery test device for a breather valve is characterized by comprising a pressure stabilizing tank, a detection tank and a vacuum pump, wherein an air supply pipe and an air supply pipe are connected to the pressure stabilizing tank, the air supply pipe is connected with the detection tank, the air supply pipe is connected with a workshop air source, a main control electromagnetic valve and an air supply electromagnetic valve are installed on the air supply pipe, a microflow tubule is connected between two ends of the air supply electromagnetic valve in parallel, a leakage electromagnetic valve and a micro flow meter are installed on the microflow tubule, the vacuum pump is connected on the air supply pipe in parallel, a pressure detector is installed on the detection tank, and a test interface for installing the breather valve is arranged on the detection tank; the aperture of the air feed pipe is 2-5 times of that of the micro-flow tubule; the main control electromagnetic valve is a three-way electromagnetic valve, one end of the three-way electromagnetic valve is connected with the vacuum pump, and the other two ends of the three-way electromagnetic valve are connected with the air supply pipe; the test interface position installation carousel on the detection jar, be equipped with the unequal butt joint mouth of a plurality of bores on the carousel, the butt joint mouth can rotate along with the carousel and corresponds the intercommunication with the test interface, the edge equipartition of butt joint mouth is equipped with a plurality of fastening screw rods that are used for connecting the breather valve, all be equipped with the fastening hole to the interface both sides on the carousel, be equipped with the locating lever on the detection jar, the rotatable suit of carousel is on the locating lever, the carousel rotates to target in place and connects lock nut in the locating lever upper end, fastening connection locking screw in the fastening hole of the butt joint mouth both sides that correspond the intercommunication with the test interface, through locking nut, locking screw connects the carousel with the detection jar and locks, the breather valve is installed on the carousel and is corresponded the butt joint mouth position of intercommunication with the test interface, test interface edge installation sealing washer on the detection jar, install sealed the pad between breather valve and the carousel.
2. The factory testing apparatus for the breather valve as claimed in claim 1, wherein the air supply pipe is provided with an air supply solenoid valve and a pressure regulating valve.
3. The factory testing device for the breather valve as claimed in claim 1, wherein the pressure-stabilizing tank is provided with a pressure gauge, a temperature sensor and an exhaust solenoid valve.
4. A delivery test method of a breather valve is characterized in that the delivery test device of the breather valve according to any one of claims 1 to 3 is used for carrying out tests, including a leakage detection test, a positive pressure opening pressure test and a negative pressure opening pressure test;
leakage amount detection test: the main control electromagnetic valve and the ventilation electromagnetic valve are opened, the leakage electromagnetic valve is closed, a workshop air source supplies air to the pressure stabilizing tank through an air supply pipe, the air source enters the detection tank through the main control electromagnetic valve and the ventilation electromagnetic valve, the pressure in the pressure stabilizing tank and the detection tank is controlled, the pressure is guaranteed to be higher than 0.75 time of positive pressure opening pressure and lower than the positive pressure opening pressure, then the ventilation electromagnetic valve is closed, the leakage electromagnetic valve is opened, the flow value of the micro flowmeter is read, and the leakage amount in unit time is obtained;
positive pressure opening pressure test: opening a main control electromagnetic valve and a ventilation electromagnetic valve, closing a leakage electromagnetic valve, supplying gas to a pressure stabilizing tank through a gas supply pipe from a workshop gas source, slowly increasing the pressure of the gas source entering a detection tank through the main control electromagnetic valve and the ventilation electromagnetic valve, observing the pressure value of a pressure detector on the detection tank, and stably opening a positive pressure valve disc of a breather valve when the pressure value of the pressure detector is stabilized at a certain pressure value, wherein the pressure value is the positive pressure opening pressure value of the measured breather valve;
and (3) negative pressure opening pressure test: the method comprises the steps that a ventilation electromagnetic valve is opened, a leakage electromagnetic valve is closed, a main control electromagnetic valve acts to enable a vacuum pump to be communicated with an air supply pipe, the air supply pipe is cut off from a pressure stabilizing tank, the vacuum pump is opened to vacuumize a detection tank, a negative pressure valve disc of a breather valve is opened, the pressure value of a pressure detector on the detection tank is observed, and the pressure value is the negative pressure opening pressure of the breather valve.
5. The factory testing method for the breather valve according to claim 4, wherein the breather valve is subjected to a leakage amount detection test, a positive pressure opening pressure test and a negative pressure opening pressure test.
6. The factory testing method for the breather valve as claimed in claim 4, wherein the value of the micro-flowmeter is measured and read once per minute and the average value is calculated by a plurality of tests during the leakage detection test.
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| CN202010798087.7A CN111735588B (en) | 2020-08-10 | 2020-08-10 | Delivery test device and method for breather valve |
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| CN202010798087.7A CN111735588B (en) | 2020-08-10 | 2020-08-10 | Delivery test device and method for breather valve |
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| CN111735588B true CN111735588B (en) | 2022-06-21 |
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| CN112985788A (en) * | 2021-02-01 | 2021-06-18 | 中山凯旋真空科技股份有限公司 | Testing device for power equipment |
| CN113588256B (en) * | 2021-08-23 | 2023-08-11 | 大连交通大学 | Experimental device for simulating aviation kerosene storage tank breather valve to freeze |
| CN114076676B (en) * | 2021-11-02 | 2024-01-05 | 南京市锅炉压力容器检验研究院 | Integrated verification platform and method for breather valve and emergency release device of liquid tank |
| CN114323968A (en) * | 2021-11-12 | 2022-04-12 | 中国矿业大学 | Single-gas-source positive-negative-pressure adjustable testing device and testing method |
| CN114441165B (en) * | 2021-12-21 | 2023-11-03 | 合肥通用机械研究院有限公司 | Temperature and pressure verification method for low-temperature micro-pressure differential pressure relief device for LNG |
| CN117268742B (en) * | 2023-11-21 | 2024-01-30 | 山东业翔检测有限公司 | On-line detection device and detection method for breather valve |
| CN117906879B (en) * | 2024-03-19 | 2024-05-17 | 上海金子自动化仪表有限公司 | Breather valve detection method and detection device |
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| CN106224631B (en) * | 2016-07-19 | 2018-06-15 | 中国人民解放军总后勤部油料研究所 | A kind of breather valve on-line measuring device and method |
| CN108181255A (en) * | 2017-12-22 | 2018-06-19 | 北京北分麦哈克分析仪器有限公司 | A kind of film microphony multicomponent Modular gas analytical equipment |
| CN207832253U (en) * | 2018-02-08 | 2018-09-07 | 北京大漠石油工程技术有限公司 | Rotate orifice plate metered flow device |
| CN109632605B (en) * | 2019-01-08 | 2021-05-28 | 温州际高检测仪器有限公司 | Trace air permeability tester |
| CN110207976B (en) * | 2019-07-10 | 2020-11-20 | 浙江省泵阀产品质量检验中心（永嘉县质量技术监督检测研究院） | Breather valve intelligent comprehensive test device for tank truck |
| CN212807528U (en) * | 2020-08-10 | 2021-03-26 | 罗浮阀门集团有限公司 | Delivery test device for breather valve |
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