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) |
---|---|
NW | NW |
NWY | NWY |
2 3/8 API Reg | 2 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 Reg | 3 1/2 API Reg |
4 1/2 API Reg | 4 1/2 API Reg |
Reviews
There are no reviews yet.