general valve pressure test with reference to this standard USES the international standard ISO 5208 'industrial valve valve pressure test' term; ( 1) The Industrial Valves pressure test: test gauge pressure inside the valve cavity should bear when

( 2) Shell test on body and cover such as coupling of the valve shell for pressure test. Purpose is to test the density of the body and bonnet and include within the body and bonnet joint in the shell of 6 M % Y compression capacity. ( * | ! L（ 3) Seal test inspection open-close part and the body seal sealing performance test.

( 4) Sealing test inspection on the valve stem and Industrial Valves cover seal sealing performance test

( 5) Test duration

in the duration of the test pressure test the test items, methods and steps of

pressure test projects include

( 1) Shell test import and export of closed valve, pressure packing gland in order to keep the test pressure, opening and closing in a partially open. To the body cavity full of test medium, and gradually to the test pressure (pressure Check from the inlet pressure) And then to shell ( Including stuffing box and the Industrial Valves body and bonnet joint) For inspection. Shell test pressure test the test duration: ( Should not be less than the stipulated in the table) ( 2) The sealing test ( On sealing structure of the valve inlet and outlet should be closed to do the test valve, relax the gland ( If the valve is equipped with the seal inspection device, and without relaxation gland can be reliably check on sealing performance, are not relax gland) State, the valve is fully open. Make sealed shut down, to the body cavity full of test medium, and pressure to the specified test pressure gradually, then check the sealing performance. 3) Main valve seal test pressure method of a class, as stated in the table, but for the medium flow in a specific direction valve, shall be in accordance with the provisions, the flow direction of the pressure, Except for the check valve) 。 Test should be pressurized to the specified test pressure gradually, then check that the seal sealing performance. Seal and seal test pressure: on the seal and seal test test duration: ( Should not be less than the stipulated in the table)

the valve test evaluation index

( 1) Shell test pressure on the wall when testing and must not have body and bonnet joint is leakage, shell ( Including stuffing box and the valve body and bonnet joint) There should be no structural damage. If there is no special regulation, allowing filler leakage under the shell test pressure, but when the test pressure to seal test pressure, should be no visible leakage. 2) On the seal test

no visible leakage within the test duration.

( 3) Sealing test seal test of maximum allowable leakage leakage are presented in table of regulation in the table applies only to emissions into the atmosphere of A level suitable for non-metallic elastic sealing valve, B, C, D is applicable to metal sealing valve. Among them: B is suitable for the more critical valves, D level applicable to the general allowable leakage valves of various types of valves ( Level) Should be in accordance with relevant regulations of the product standard. If the relevant standards did not make specific provision, the non-metallic elastic sealing valve in accordance with the requirements of grade A metal sealing valve according to grade-d demands such as user according to the B level or C level should be in the order specified in the contract.

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