1) the valve must be according to related national standard valve design, material selection, manufacturing. The cast steel valve body according to the requirements or related material standard.
2) valve seal standard according to the GB standards.
3) the valve selection level and working parameters according to the provided operation condition, in line with the system the design requirements and related laws and regulations and standards.
4) all valves shall meet the distance body 1 m no more than 85 db noise.
5) valve and pipeline of the welding, body import and export and take over diameter should agree, if the valve and pipeline interface wall thickness can't meet the requirements of the welding should add transition section, and at the same time, such as valve interface material and pipe material incompatibility the supplier should provide the transition section, transition section with the valve should be provided after welding the whole. If the valve and pipeline take flange connection, should be with the valve to provide corresponding level reverse flange and connecting bolt attachment. Accessories gasket 2.5 Mpa the following can be used asbestos gasket above the high-strength graphite gaskets. Oil system valve using oil asbestos gasket.
6) power operation valve actuator design should be according to the system design pressure calculation.
7) all valves surface should be carry on the processing, to ensure that in appearance.
8) all valves Numbers should be printed in the valve nameplate.
9) all valves shall be hydraulic pressure test, the test pressure shall be the nominal pressure of 1.5 times, duration for no less than twenty minutes.
 

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