초록 ▼

A mud saver valve has been developed for controlling flow of drilling fluid through an upper portion of a drill string, the mud saver valve in one aspect has a tubular housing, a ball closure rotatably disposed within the tubular housing, the ball closure having a body, a flow channel therethrough,

A mud saver valve has been developed for controlling flow of drilling fluid through an upper portion of a drill string, the mud saver valve in one aspect has a tubular housing, a ball closure rotatably disposed within the tubular housing, the ball closure having a body, a flow channel therethrough, a first body side and a second body side opposite the first body side, a first lug projecting from the first body side and a second lug projecting from the second body side, a sleeve assembly movably disposed within the tubular housing, the sleeve assembly having a first and a second actuator e.g, dogs, to engage corresponding first and second lugs of the ball closure to open or close the ball closure in response to fluid pressure conditions as well as engagement and disengagement of the tubular housing with the drill pipe against the force of a coil spring disposed within the tubular housing.

대표청구항 ▼

A mud saver valve for controlling flow of drilling fluid through a drill string, the mud saver valve comprising: a housing removably attachable to the drill string; a ball closure rotatably disposed within the housing, the ball closure having a body, a flow channel therethrough, a first body side an

A mud saver valve for controlling flow of drilling fluid through a drill string, the mud saver valve comprising: a housing removably attachable to the drill string; a ball closure rotatably disposed within the housing, the ball closure having a body, a flow channel therethrough, a first body side and a second body side opposite the first body side, a first lug projecting from the first body side and a second lug projecting from the second body side; a sleeve assembly movably disposed within the housing, the sleeve assembly having an outer surface and an inner surface, a first actuator and a second actuator projecting from the inner surface, the first and second actuators co-operating with the first and the second lugs of the ball closure to rotate the ball closure between open and closed positions; biasing means disposed within the housing, acting upon the sleeve assembly; and means for responding to fluid pressure conditions in the drill string, whereby the ball closure is movable to an open position.