1, a certain specification of valve mass manufacturing, should entrust the authority of the following performance testing: (2) valve in the pipeline under the condition of water flow resistance coefficient detection.

 

2. The valve shall be tested as follows before delivery: (1) under the condition of opening the valve, the valve body shall bear the internal pressure test of twice the working pressure of the valve; (2) the valve in the closed condition, both sides bear 11 times the working pressure of the valve, no leakage; But metal seal butterfly valve, leakage value is not greater than the relevant requirements.

 

Other requirements

 

1. Purge the assembled valve with nitrogen for at least 1 minute.

 

2. Air tightness test ** USES pure nitrogen.

 

3. After passing the air-tightness test, seal it with a clean polyethylene cap. Soak it in organic solvent and wipe it clean before using the polyethylene cap.

 

4. Seal with a vacuum bag.

 

5, ** packing.

 

6. During transportation, measures should be taken to ensure the package is not damaged.