Three pneumatic valve pressure testing method

in general, industrial pneumatic valve when use don't do strength test, but after the repair of pneumatic valve body and bonnet or corrosion damage of pneumatic valve body and bonnet should be tested for strength test. For safety pneumatic valve, the setting pressure and back pressure, and other test shall comply with the terms of the instruction and the relevant regulations. Pneumatic valve installation of akira strength and tightness test should be done. Low pressure pneumatic valve % selectiving examination, such as unqualified shall be % of the check; Medium and high pressure pneumatic valves shall be % of the inspection. Commonly used medium pneumatic valve pressure test with water, oil, air, steam, nitrogen, etc. , all kinds of industrial pneumatic valve with pneumatic pneumatic valve pressure test method is as follows:

, pneumatic ball valve pressure testing method of pneumatic ball valve strength test shall be carried out under the sphere ajar.
1) floating ball pneumatic valve leakage test: will the pneumatic valve in a state of half open, the introduction of test medium at one end, the other end closed; Rotating the ball a few times, pneumatic valve in full close state when open the closed end to check, and check the packing and gasket sealing performance, can not have leakage phenomenon. Then on the other side the introduction of test medium, repeat the test.
(2) fixed pneumatic ball valve leakage test: sphere no-load rotational several times before the test, fixed pneumatic ball valve in the closed state, from one end of an experiment medium to the specified value; Times. Within the prescribed time, no buck phenomenon for qualified; Again from the other end of the introduction of test medium, repeat the test. On both ends of the pneumatic valve is then in a state of half open, closed, the lumen with medium, under the pressure test to check the packing and gasket, can not have leakage.
(3) pneumatic three-way ball valve leakage test should be in each position.
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check pneumatic valve pressure testing method check pneumatic valve test condition: aerodynamic lift check valve pneumatic disc axis in and horizontal vertical position; Swing check pneumatic valve channel axis and pneumatic disc axis in parallel with approximate horizontal position.
strength test, the test medium to the specified value, introduced from the inlet side, the other end closed, the pneumatic valve body and no leakage for qualified for pneumatic valve cover.
sealing experiment introduced from outlet medium, on the inlet side check the sealing surface, no leakage for qualified for packing and gasket.
and reduced pressure pneumatic valve pressure testing method
(1) strength test of reduced pressure pneumatic valve on single test after assembly, also can test after assembly. Strength test duration: DN< Lmin mm; DN is greater than the min ~ mm; DN > Mm is greater than the min. Times, strength test in the air.
(2) according to the actual work medium leakage test. Test times; Steam test, to working temperature to allow maximum working pressure. The difference between the inlet pressure and outlet pressure for not less than. MPa。 After the test method is: the inlet pressure setting, gradually adjust the adjusting screw of the pneumatic valve, make the outlet pressure sensitive reaction in the maximum and minimum value range, continuously change, can not have stalled, jam phenomenon. Pneumatic valve decompression for steam, when the inlet pressure, close the pneumatic valve, pneumatic valve after truncation outlet pressure as the highest and lowest, within the min, the outlet pressure of appreciation should conform to the table. — After, at the same time, the pneumatic valve pipe volume conform to the table. Specified in the qualified; Pneumatic valve decompression for water, air, when the inlet pressure setting, the outlet pressure is equal to zero, close vacuum pneumatic valve leakage test, no leakage for qualified in min.