Abstract: A check valve with a flapper for directing high pressure abrasive fluid away from its sealing face. The check valve has a flapper which opens when fluid travels from an inlet to an outlet. The flapper closes when fluid flow stops or reverses by sealing a flat sealing face to a seal formed in a shoulder face of the valve. A surface feature protrudes from near the flat sealing face and forms a slanted face opposed to the direction of flow through the valve. This slanted face interfaces with fluid flow to more easily open the valve and directs flow away from the sealing face to reduce wear.

Abstract: Apparatus and method contemplating a high pressure fluid end assembly having a body defining a body bore and defining a recess in the body intersecting the body bore. A closure is joined to the body and forms a sealing surface. A seal is mounted to the body in the recess and configured to extend from the recess beyond the body bore to seal against the sealing surface formed by the closure.

Abstract: An apparatus and associated method for operating a machine tool having a selectively movable turret and a tool mounted to the turret. A cover is configured to be removably secured to the turret and sized so that the cover encloses the tool when the cover is secured to the turret. Turret control logic includes computer instructions stored in a computer memory and executable by a computer processor to limit movement of the turret when the cover is secured to the turret.

Abstract: A workpiece supporting assembly, having a body member with an internal workpiece channel and a plurality of body openings communicating with the internal workpiece channel, supports a workpiece within the workpiece channel so that end portions of the workpiece extend from the body openings. The body member has a plurality of arbors, each arbor having a longitudinal axis that is coincident with a datum axis of one of the extending workpiece portions. A turning machine grips one arbor at a time and rotates the body member about the selected longitudinal axis for machining the extended workpiece portion.

Abstract: A workpiece supporting assembly, having a body member with an internal workpiece channel and a plurality of body openings communicating with the internal workpiece channel, supports a workpiece within the workpiece channel so that end portions of the workpiece extend from the body openings. The body member has a plurality of arbors, each arbor having a longitudinal axis that is coincident with a datum axis of one of the extending workpiece portions. A turning machine grips one arbor at a time and rotates the body member about the selected longitudinal axis for machining the extended workpiece portion.