Special requirements of its valve reliable quality and excellent performance. Valve performance evaluation and performance testing, you should pay attention to several points:

1.Open and close the valve under pressure at work flexible, lightweight, at work under pressure detection on torque with a torque wrench.

2.The valve is closed tight, at 1.1 times the working pressure does not meet the standard requirements seepage or leakage (metal sealing butterfly valve), which requires both sides of the valve turns under pressure, were detected, and the opening and closing several times to achieve the same effect. Requirements of various calibres, different types of valves should be detected at the manufacturer and have qualified units close with a load of life detection. This test also includes the evaluation of the valve shaft sealing effect.

3.Stronger valve flow capacity, particularly butterfly, butterfly plate resistance is smaller overcurrent, overcurrent effective area should be large. This requires various calibres, different types of valves should be carried out flow resistance coefficient.

4.The capacity of the body to withstand water pressure consistent with the pipeline, the valve is open, the valve can withstand the test pressure piping requirements.

Keywords:ball valve,globe valve,butterfly valve,knife gate valve,basket strainer