Check Valve

Check valves are self - activating safety valves that permit gases and liquids to flow in only one direction,preventing process flow from reversing. They are classified as one - way directional valves. Fluid flow in the desired direction opens the valve, while backflow forces the valve closed. The mechanics of check valve operation are relatively simple.Most check valves contain a ball that sits freely above the seat,which has only one through hole. The ball has a slightly larger diameter than of the through hole. When the pressure behind the seat exceeds that above the ball,liquid is allowed to flow through the valve;however ,once the pressure above the ball exceeds the pressure below the seat,the ball returns to rest in the seat,forming a seal that prevents backflow.
VE-LOCK Check Valves is 100% tested with nitrogen gas at 1200psig (80 Bar) for leakage at seal & seal. Hydrostatic test performed with pure water at 1 12 times of the working pressure. Other optional tests like helium and temperature are available upon request.