The principle of pneumatic valve down and pay attention to matters

on pneumatic valve should be promptly eliminate water accumulation in the pneumatic valve and clean, pneumatic valve after pressure test. Should also be prepared test on-site.
pneumatic valve strength test, not usually. But after the repair pneumatic valve and pneumatic valve cover or erosion damage of pneumatic valve and pneumatic valve cover strength test should be done. For peace pneumatic valve, the constant pressure and back pressure, and other test shall comply with the package insert and related procedures defined.
pneumatic valve device made of strength and tightness test should be done. Low pressure pneumatic valve % % differences such as lattice selectiving examination should check; Medium and high pressure pneumatic valves shall be % check.
pneumatic valve device location should be easily in the direction of the check. When test.
use/board test can be used when no taper sealing or O ring seal pressure test. Pneumatic valves in the form of welding connection.
when the hydraulic pressure test will be pneumatic valve air out as far as possible.
do not allow a sharp, hardcore pressurization. When the test pressure to increase gradually.
large diameter pneumatic valve test time can be longer accordingly. During the trial, continue to strength test and sealing test time is commonly ~ min important and special pneumatic valve should last min small pneumatic valve test time can be shorter. If in doubt can prolong the test of time. Do not allow pneumatic valve body strength test, and sweat on the pneumatic valve cover or leakage phenomenon. Leakage test, rotor pump is generally only a pneumatic valve, pneumatic valve peace, such as high pressure pneumatic valve to pneumatic valves require twice. Test, the low pressure, large diameter pneumatic valve is not important, and delimit the promise of the leakage of pneumatic valves, promised to have traces of leakage phenomenon; Because general pneumatic valve, power station with pneumatic valve pneumatic valves, pneumatic valves, and other requirements vary, the leakage requirements shall be in accordance with relevant designated execution.
but should make strength test and packing and gasket sealing test. Throttling pneumatic valve should not be closed a leakage test.
pneumatic valve sealing force only allow a person's normal physical strength to closed; Shall not be leveraged tools such as strength, In addition to the torque wrench when the handwheel diameter greater than to wait until in mm, pressure testing. Promised to close together.
on seal officer after, with the seal of pneumatic valve leakage test should be done out packing. Check whether the leakage. Using gas as test, water check in the stuffing box. Make packing sealing test, do not allow the seal in the close position.
to test its sealing application drive closed pneumatic valve antagonism for leakage test. Rival drives, whoever has the drive pneumatic valve. Should also use pneumatic sealing valve sealing experiment was carried out.
the pneumatic valve for strength and tightness test; Main pneumatic valve closed when opening a strength test and leakage test after mounted on the main pneumatic valve side vent valve. Should be open.
application copper hammer small buckle pneumatic valve body and valve cover, cast iron pneumatic valve strength test. Check for leaks.
in addition to cock pneumatic valve is defined to seal face oil, pneumatic valve testing. Other pneumatic valve oil on the surface of the sealing test is not allowed.
blind slabs shoulds not be too great pressure force of pneumatic valve, pneumatic valve pressure testing. In order to avoid deformation of pneumatic valves, affect test result ( Cast iron is too tight, the pneumatic valve if damaged