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

Dimensional Data