performance test method: 1, the strength test, valve were classified as pressure container, so need to meet the requirements of under medium pressure without leakage, so the valve body, bonnet and other parts of the blank should not influence the strength of the crack, loose porosity, slag inclusion and other defects. factory in addition to blank, appearance and inner quality of strict inspection should also by strength test, to ensure the performance of the valve. Strength test is often done after the final assembly. Blank quality instability or after repair welding must be heat treated parts, in order to avoid and reduce all kinds of waste caused by test is unqualified, can be in the middle of the part after rough machining strength test ( Often referred to as the pump) 。 After the strength test in the middle of the parts assembly, such as the user does not request, valve can no longer for strength test. Sue Industrial Valves in order to ensure the quality, in the middle after the strength test, valve strength test of the reentry after all. Test usually at room temperature, to ensure safe use of test pressure P for nominal pressure commonly PN 1. 25 ~ 1. 5 times. Test when the valve is fully open, closed at one end, on the other end into the medium and pressure. Check the shell ( Body and cover) Exposed surface, which requires the prescribed test duration ( Generally not less than 10 minutes) No leakage, can only think that the Industrial Valves strength test. To guarantee the reliability of the test, the strength test should be performed before the valve painted, with water as the medium of the inner chamber should be sent to the air line net. leakage, such as technical conditions allow repair welding according to technical specification for repair welding, but must be strength test after repair welding, and extend test duration. 2, sealing test: in addition to the throttle valve, adjust cut off with the valve with Industrial Valves, all should have certain closing sealing, so the valve seal test should be carried out by machine before delivery, take seal valve on sealing experiment was carried out. Test is usually carried out at room temperature to the nominal pressure PN, usually in 1. 1 times the PN under pressure. With water as the test medium, make the valve produces rust easily, usually according to the technical requirements for water quality control, and residual water blow dry or drying them after the test. Gate valve and ball valve with two seal, a two-way sealing test is required. Test, the first open valve, the passage end block, pressure from the other end of the introduction, e. when the pressure in the closure, the valve will then seal the pressure gradually to be lifted, and check. At the other end and repeat the test. Gate of another kind of test method is to maintain test pressure in the cavity of, from the channel of the double sealing valve on both ends.
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