Non return valves are essential devices that allow a liquid to flow through them in one direction but completely prevents its movement in the opposite direction into the drill string.
F.G.S. Drill sells a wide dimensional range of non return valves. On specific customer request, F.G.S. Drill manufactures non return valves subs or rods.
Non return valves specification guide
Bit and Shank Sizes
DRILL PIPE NON RETURN VALVE SUBS
API Regular Threads – Box or Pin
API Full Hole – Box or Pin
API IF Internal Flush – Box or Pin