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Respiratory valve pressure test

Respiratory valve pressure test
1. Test preparation Fit the fire-resistant breathing valve correctly on the test stand, the device shall not leak and the inner wall of the test tube shall be smooth and smooth. 2. Detection medium The test medium for opening pressure, ventilation rate and leakage of fire-resistant breathing valve is air, with absolute pressure of 0.1Mpa, temperature of 20 C, relative humidity of 50% and density of 1.2kg/m3. If air is not in this state, it should be converted into gas in this state.The test medium for the pressure of the fire-resistant breathing valve body is 5-35 deg. C. clear water. 3. Air pressure detection First check its leakage rate, then check its sensitivity and ventilation rate one by one. 4. Water pressure detection The pressure of fire-resistant breathing valve for hydrostatic test is 0.2Mpa and the holding time is 10min. 5. Pressure detection Fit the fire-resistant breathing valve on the connecting flange of the gas storage tank, adjust the valve so that the pressure in the gas storage tank gradually increases or decreases, adjust the valve disc to make it open, read out the pressure value on the connected micro-pressure gauge, read it once every minute, then turn the disc 90 times respectively.°、180°,Repeat the above tests three times for each operating condition and take the mean value. 6. Leakage detection The pressure for leak detection is 0.75 times the operating pressure, which is read on the micromanometer.The leakage value is read once per minute by the flow meter (the accuracy of the flow meter is 0.5-1.0 grade), and read three times in total to take the average value. 7. The fire-resistant breathing valve for low temperature detection is installed on the test stand and placed in the low-temperature box. The temperature in the low-temperature box falls to 4-15 degrees Celsius. At the same time, the room temperature air with relative temperature not less than 70% is continuously input into the low-temperature box. The box is closed in
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Solenoid valve controls the position of valve core through an electromagnetic coil to achieve the purpose of changing the flow direction of fluid, or to cut off or connect air source. The electromagnetic components of the commonly used four-way solenoid valve consist of fixed iron core, moving iron core, coil and other parts. The part of valve body consists of sliding valve core, valve body, sliding valve sleeve, spring base, etc. The working principle of four-way solenoid valve. When there is electricity flowing through the coil, excitation will be generated, and the iron core will be fixed to absorb the moving iron core. The moving iron core will drive the sliding valve core and compress the spring, which changes the position of the sliding valve core and thus changes the direction of the fluid. When the coil loses power, the sliding valve core is pushed by the spring's elasticity, and the iron core is pushed back to make the fluid flow in the original direction. This kind of sole...
Jul 19, 2024
Leakage is the easiest failure of regulating valve during operation. Some leak at the welding place, and some leak at the sealing place of the stuffing. When leakage occurs at the welding site, repair welding can be done during overhaul; when leakage occurs at the sealing site of the stuffing, new stuffing can be replaced. Sometimes the film of the film actuator is damaged, and the valve stem can't act normally with the air pressure signal, so it needs to be replaced with a new film. In order to avoid the deformation of the valve stem affecting the regulating function, it is better to stand on the pipeline when installing the regulating valve. It is not suitable to install the low-temperature film regulating valve horizontally, and it should form an angle above 150 with the level so that the sealing place of the stuffing is not affected by the liquid. The slanting valve must be lifted. When operating, always pay attention to whether the regulating valve gets stuck. The sealing fille...
Apr 17, 2024
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