| 摘要 |
A valve seat for a ball valve of a positive displacement pump for producing fluid from a subsurface formation wherein the valve seat is provided by a valve assembly having a non-corrosive hollow metallic housing therein which may have an internal radial groove therein, the metallic housing having an elastomeric material forming a bonded insert which has an aperture therethrough and a chamfered face for seating the ball of the ball valve in sealing engagement with said bonded insert. |
