초록 ▼

A hydraulically controlled ram actuating mechanism 10 for a blowout preventer controls the opening and closing of a ram block 12 interconnected with a ram 14 movable within a ram housing 26 along ram axis 16. The ram piston 24 and a locking piston 62 are each movable within the ram housing in respon

A hydraulically controlled ram actuating mechanism 10 for a blowout preventer controls the opening and closing of a ram block 12 interconnected with a ram 14 movable within a ram housing 26 along ram axis 16. The ram piston 24 and a locking piston 62 are each movable within the ram housing in response to fluid pressure. The locking piston includes a plurality of substantially planar tapered locking piston surfaces 72 circumferentially arranged on the exterior of the locking piston and inclined at an acute positive cam angle. A plurality of locking rods 40 are each secured to the ram housing 26 and are circumferentially spaced about the locking piston, with each locking rod including a substantially planar tapered locking rod surface 82 thereon inclined at an acute negative cam angle. A plurality of locking segments 60 are each spaced radially between a locking rod and the locking piston, with each locking segment adapted for being sandwiched between the locking surfaces for preventing opening of the ram until the locking piston is moved in response to fluid pressure. The actuating mechanism reliably controls the flow of well fluids through the blowout preventer and may be automatically locked in an infinite number of locking positions within a wide locking range.

대표청구항 ▼

A blowout preventer ram actuating mechanism for controlling the opening and closing of a ram block interconnected with a ram movable within a ram housing and along a ram axis between opened and closed positions, the ram actuating mechanism comprising: a ram piston secured to the ram and axially mova

A blowout preventer ram actuating mechanism for controlling the opening and closing of a ram block interconnected with a ram movable within a ram housing and along a ram axis between opened and closed positions, the ram actuating mechanism comprising: a ram piston secured to the ram and axially movable within the ram housing, the ram piston having a ram closing end face and an axially opposing ram opening end face; a ram closing flow line for applying fluid pressure to the ram closing end face of the ram piston to move the ram block to the closed position; a ram opening flow line for applying fluid pressure to the ram opening end face of the ram piston to move the ram block to the opened position; a locking piston sealing engaging the ram piston and movable along the ram axis in response to fluid pressure, the locking piston having a locking end face, an axially opposing unlocking end face, and a plurality of substantially planar tapered locking piston surfaces circumferentially spaced about an exterior of the locking piston and each inclined at an acute positive locking piston cam angle; an unlocking piston flow line for applying fluid pressure to the unlocking face of the locking piston to move the locking piston to an unlocked position; a plurality of locking rods each secured to the ram housing and circumferentially spaced about the locking piston, each locking rod including a substantially planar tapered locking rod surface thereon inclined at an acute negative locking rod cam angle; and a plurality of locking segments each spaced radially between a respective locking rod and the locking piston, each locking segment being sandwiched between a respective planar locking rod surface and a planar locking piston surface for preventing opening of the ram until the locking piston is moved in response to fluid pressure in the unlocking piston flow line.