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Non-return valve
Non-return valveNon-return valveNon-return valve

Non-return valve

Non-return valves are used to reduce back- pressure when pumping water through the drill string, or behind a rock bit.

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Product Description

Non-return valves are used to reduce back- pressure when pumping water through the drill string, or behind a rock bit. These NRV units have a minimum number of parts to give a long and trouble-free service life. The valve section is manufactured entirely from brass to resist corrosion and normally the only service required is occasional replacement of the O-ring seal and spring. Top and bottom adaptors are supplied to customer requirements in any combination listed below.

 

Top Sub (Box)Bottom Sub (Pin or Box)
NWNW
NWYNWY
2 3/8 API Reg2 3/8 API Reg
23/8 API I.F. (HWY)23/8 API I.F. (HWY)
2 7/8 API Reg (HY)2 7/8 API Reg (HY)
3 1/2 API Reg3 1/2 API Reg
4 1/2 API Reg4 1/2 API Reg

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