Short Description:

Throw-Type Back Pressure Valve Type HY   Model “HY” Throw-Type Back Pressure Valve is an internal preventer. When blowout is going to happen, the Kelly rod should be removed immediately and the back pressure valve assembly should be put into the I.D.  and then pumped downward to the required place. Thus, the blowout can be prevented. Specifications Product Code O.D  mm（in） Connection Pressure  grade  （Mpa） NFQ105 105(4 1/8) NC31 70、105 NFQ127 127(5) NC38 70、105 NFQ159 159(...