100% of the required pipe valve nondestructive testing, requires air tightness testing before factory valve; all valves within the tube wall, the polishing Ra≤0.8
The inner pipe of the valve shall be subject to 100% nondestructive testing, and the valve shall be subject to air tightness test before leaving the factory; the inner wall of the inner pipe of the valve shall be polished with RA ≤ 0.8<br>