( 1) In general, the valve should not be strength test, but after the repair body and cover or corrosion damage of the body and cover a strength test should be done. For the relief valve, the constant pressure and back pressure, and other test shall comply with the terms of the instruction and the relevant regulations.

( 2) The installation of the valve akira strength and tightness test should be done. Low-pressure valve 20% selectiving examination, such as unqualified should be 100% of the check; Medium and high pressure valves should be 100% of the check.

( 3) Test, the direction of the valve installation position should be easy to check.

( 4) Welding connection forms of the valve, use/board test can be used when no taper sealing or O ring seal pressure test.

( 5) Hydraulic pressure test the valve when the air to eliminate as much as possible.

( 6) When test pressure is gradually increased, don't allow a sharp, sudden pressurization.

( 7) Strength test and sealing test duration generally for 2 ~ 3 min, important and special valve should be continued for 5 min. Small diameter valve test time can be shorter accordingly, large diameter valve test time can be longer accordingly. In the process of test, if in doubt can prolong the test of time. Strength test, do not allow the body and cover a sweating or leakage phenomenon. leakage test, generally only once, relief valve, high pressure valve to the valve should be twice. Test, not important valve of low pressure, large diameter and has a regulation allows the leakage of the valve and allow a trace of the leakage phenomenon; Due to the common valve, power station with valve, Marine valve and other valve requirements vary, the leakage requirements shall be in accordance with relevant provisions.

( 8) Throttle valve should not be shut down a leakage test, but should be done to strength test and packing and gasket sealing test.

( 9) Pressure test, the valve closing force only allow a person's normal physical strength to close; Shall not be leveraged tools such as strength, In addition to the torque wrench) Until 320, when the handwheel diameter mm, allowing two people close together.

( 10) Has a seal on the valve leakage test should be done to take out the packing, the seal officer, after check whether leakage. Using gas as test, check the water in the stuffing box. Make packing sealing test, are not allowed to seal in the close position.

( 11) Whoever has the drive device of the valve, close valve test its sealing application drive antagonism for leakage test. Rival drive, also should undertake with dynamic close the valve seal test.

( 12) After the strength test and leakage test in the main valve on the bypass valve, the main valve for strength and tightness test; Open, when the main Industrial Valves closed, also should be open.

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