Principles and precautions of valve pressure test
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Release Time：2018-12-24
Valve production is a complex and simple process, the production of a good valve must go through a variety of performance testing, one of the most important test is pressure test. Pressure test is to test whether the pressure value that the valve can withstand meets the requirements of production regulations. Generally, the pressure test of the valve must comply with the following principles and precautions:(1) Under normal circumstances, the valve is not tested for strength, but the valve body and valve cover after repair or corrosion damage should be tested for strength. (2) the valve should be installed before the strength and tightness test. (3) During the test, the valve installation position should be in the direction of easy inspection. (4) Welding connection form
Valve production is a complex and simple process, the production of a good valve must go through a variety of performance testing, one of the most important test is pressure test. Pressure test is to test whether the pressure value that the valve can withstand meets the requirements of production regulations. General valve pressure test must comply with 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.
(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 conical seal or O-ring seal pressure test.
(5) the hydraulic test when the valve air as far as possible to exclude.
(6) During the test, the pressure should be gradually increased, and sharp or sudden pressurization is not allowed.
(7) The duration of strength test and sealing test is generally 2-3min, and important and special valves should last 5min. Small diameter valve test time can be correspondingly shorter, large diameter valve test time can be correspondingly longer.
(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) During the pressure test, the valve closing force only allows one person's normal physical strength to close; Do not use tools such as levers to add force. When the diameter of the handwheel is greater than 320mm, two people are allowed to close together.
(10) The valve with upper seal shall be taken out for sealing test. After the upper seal is closed, check for leakage. When testing with gas, check with water in the stuffing box. The upper seal is not allowed to be in a tight position during the packing tightness test.
(11) For valves with driving device, the sealing test shall be conducted by closing the valve with driving device. For the manual driving device, the sealing test of the valve with dynamic closing shall also be carried out.
(12) 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.
(13) cast iron valve strength test, the application of copper hammer tap the valve body and valve cover, check whether there is leakage.
(14) 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.
(15) During the valve pressure test, the pressing force of the blind plate on the valve should not be too large to avoid deformation of the valve and affect the test effect.
(16) 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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