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Procurement Matters of Valves

Purchasing valve is a difficult task to be required carefully. Valves have played an important role, such as check valve.
The valve type should be specified in national standard code, if the valve type is the enterprise standards, should be specified instructions. The valve manufacturing standards should explain the national standard code, if the valve type is the enterprise standards, it should be attached to business documents on procurement contracts. The valve working pressure should be greater than or equal to work pressure of pipelines, under the premise of affecting the price, working pressure endured by the valve should be greater than the actual pipe work pressure.
During the valve procurement, we should test the performance of the valve. The valve should be carried out following detection before leaving the factory, valve in the open position, the valve shall be subjected to internal pressure sensor that is twice of the working pressure valve value; valve in the closed position, valve sides were subjected to 11 times the value of the working pressure, no leakage; but the metal sealing butterfly valve, leakage is no greater than the relevant requirements.

Check Valve

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