Combination subsurface safety valve and chemical injector valve
Lubricator valve apparatus
Tubing manipulated test valve and latch assembly
Rod operated rotary well valve Patent #: 4230185
ApplicationNo. 06/136831 filed on 04/03/1980
US Classes:166/250.08, Leak testing or locating166/321, Fluid pressure biased to open position position166/332.1, Longitudinally movable operator251/77LOST MOTION BETWEEN ACTUATOR AND VALVE
ExaminersPrimary: Pate, III, William F.
Attorney, Agent or Firm
International ClassesE21B 47/10 (20060101)
E21B 34/00 (20060101)
E21B 34/10 (20060101)
AbstractA drill pipe tester valve includes a spherical valve member supported from an upward facing surface of a housing so that downward forces exerted on the valve member in its closed position, due to fluid pressure in a string of pipe above the valve member, are transmitted substantially entirely to said housing. A latching device is provided for latching the spherical valve member in its closed position as the string of pipe and tester valve are lowered into a well and for subsequently releasing the spherical valve member and allowing it to move to its open position when the string of pipe and tester valve are finally positioned within the well.