Apparatus and method contemplating a high pressure fluid end assembly having a body defining a body bore and defining a groove 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 groove and configured to extend from the groove beyond the body bore to seal against the sealing surface formed by the closure.

A valve device includes: a driving source making rotational motion; a rotated part provided rotatably around a predetermined axis; and a fluid passage portion having a flow hole for passing a fluid. The valve device further includes: a gear mechanism having gears to transmit rotational motion of the driving source to the rotated part by engagement between the gears to rotate the rotated part; and a biasing part biasing the rotated part toward one side in a circumferential direction with the predetermined axis at the center. The rotated part includes a rotor increasing or reducing an opening of the flow hole in conjunction with rotation of the rotated part and is rotated according to rotational motion of the driving source while being biased toward the one side in the circumferential direction by the biasing part.

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.

A high pressure plug valve includes a valve body having an annular inner surface with a taper having a first taper direction and an annular body saver having an outer surface with a taper having a second taper direction opposite the first taper direction. The outer surface of the annular body saver adapted to interface with the annular inner surface of the valve body with a tapered interference fit.

A fluid valve includes a valve body and a plug. The body includes a chamber and ports that communicate with the chamber. The plug is rotatably disposed in the chamber, and includes a seal disposed in an annular groove provided on the plug surface. An elastic member is disposed in the groove, and biases the seal against an inner surface of the chamber. The seal includes a seal retaining feature that is configured to retain the seal within the groove.

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.

Apparatus and method contemplating a high pressure fluid end assembly having a body defining a body bore and defining a groove 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 groove and configured to extend from the groove beyond the body bore to seal against the sealing surface formed by the closure.

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.

A fluid valve includes a valve body and a plug. The body includes a chamber and ports that communicate with the chamber. The plug rotates within the chamber, and includes a seal disposed in an annular groove provided on the plug surface. An elastic member is disposed in the groove, and biases the seal against an inner surface of the chamber. When the plug is oriented relative to the body so that the groove is aligned with a port, the seal segregates the chamber into a first chamber that borders an outer surface of the seal and a second chamber that borders an inner surface of the seal, and provides a fluid-tight seal between the first chamber and the second chamber. In addition, the seal inner and outer diameters vary based on a fluid pressure difference across the seal.

A fluid end assembly comprising a housing having multiple conduits formed therein. A tubular sleeve is installed within one of the conduits and is configured to house a plurality of packing seals. A seal is installed within a groove formed in the walls of the housing surrounding the tubular sleeve such that the seal engages an outer surface of the tubular sleeve.