Principle of valve pressure test
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Release Time：2020-06-22
Valve production must go through a variety of performance testing, one of the most important test is pressure test. Pressure test is Wuhan Xiete Valve Technology Co., Ltd. meets the requirements of production regulations. Valve pressure test must follow the following principles and precautions: (1) Under normal circumstances, the valve does not have strength test, but the valve body and valve cover after repair or corrosion damage The valve body and valve cover should be tested for strength. (2) the valve should be installed before the strength and tightness test. Medium and high pressure valves should be 100% inspection. (3) During the test, the valve installation position should be in the direction of easy inspection. (4) welding connection form of the valve, with blind plate
Valve production must go through a variety of performance testing, one of the most important test is pressure test. Pressure test is Wuhan Xiete Valve Technology Co., Ltd. meets the requirements of production regulations. Valve pressure test must follow the following principles and precautions:
(1) Under normal circumstances, the valve does not have a strength test, but the valve body and bonnet after repair or corrosion damage of the valve body and bonnet should be strength test.
(2) the valve should be installed before the strength and tightness test. Medium and high pressure valves should be 100% inspection.
(3) During the test, the valve installation position should be in the direction of easy inspection.
(4) welding connection form of the valve, with blind plate pressure test can not be used when the conical seal orOThe pressure test shall be conducted for the seal of the profile ring.
(5) the valve air shall be excluded as much as possible during the hydraulic test.
(6) During the test, the pressure should be gradually increased, and sharp or sudden pressurization is not allowed.
(7) strength test and sealing type test has a certain duration, large diameter valve test time can be correspondingly longer. During the test, if there is any doubt, the test time can be extended. During the strength test, the valve body and bonnet are not allowed to sweat or leak. Sealing test, the general valve only once.
(8) The throttle valve shall not be tested for the tightness of the closing parts, but shall be tested for the strength and the tightness of the packing and gasket.
(9) For valves with driving devices, the valve shall be closed by the driving device for sealing test. For the manual driving device, the sealing test of the valve with dynamic closing shall also be carried out.
(10) strength test and sealing test installed on the main valve after the bypass valve, the main valve strength and sealing test; the main valve closed parts open, should also be opened.
(11) valve test, in addition to the plug valve has provisions to allow the sealing surface oiling, other valves are not allowed in the sealing surface oiling test.
(12) When the valve pressure test, the pressure of the blind plate on the valve should not be too large, so as to avoid the deformation of the valve and affect the test effect.
(13) After the valve pressure test is completed, the water in the valve should be drained and wiped clean in time, and test records should be made.
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