Arrow Type Check Valves
Arrow Type Check Valves used to be installed between drill stem and bet to prevent drilling fluid backflow from the bottom. The body is a crossover sub in which the other parts are installed. When backflow occuring, the Arrow will press to valve seat so that the fluid can not flow upwards through the valve. When Arrow falls on the down seat, the circulating of drilling fluid can flow through the valve without pressure loss.
Technical specifications and parameters:
| Type | O.D.(mm) | Connection | I.D.(mm) | Working Pressure(MPa) |
| FJ229 | 229 | 7 5/8 REG | 82 | 70(35) |
| FJ203 | 203 | 6 5/8 REG | 82 | 70(35) |
| FJ178 | 178 | 5 1/2 FH | 82 | 70(35) |
| FJ168 | 168 | NC50 | 82 | 70(35) |
| FJ165 | 165 | NC50 | 82 | 70(35) |
| FJ159 | 159 | NC46 | 70 | 70(35) |
| FJ121 | 121 | NC38 | 56 | 70(35) |
| FJ105 | 105 | NC31 | 44 | 70(35) |
| FJ89 | 89 | NC26 | 33 | 70(35) |