A control valve 8 according to the present disclosure includes a casing 21 in which an outlet for a liquid is formed and the liquid is accommodated, a rotor 22 rotatably accommodated in the casing 21 and having a communication port communicating with the outlet, and a sliding ring 131 having a sliding surface 141a sliding on an outer surface of the rotor in a state of being disposed inside the outlet and causing the outlet and the communication port to communicate with each other according to a rotation position of the rotor 22, in which a liquid holding portion for holding the liquid between the sliding surface 141a and the liquid holding portion is provided on the outer surface of the rotor 22, and the liquid holding portion has a recessed portion for accommodating the liquid.

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 control valve includes a casing, a valve body, and a seal cylinder member. The casing has an inlet and an outlet. The valve body is rotatably disposed inside the casing, and has a peripheral wall portion formed with a valve hole providing communicating between the inside and the outside. One end portion of the seal cylinder member communicates with a downstream side of the outlet, and a valve sliding contact surface is provided at the other end portion. A protruding height of the other end portion of the seal cylinder member continuously changes in a circumferential direction thereof to conform to a shape of an outer circumferential surface of the circumferential wall portion. A region of the other end portion of the seal cylinder member where the protruding height is lower is provided with a thick portion that is thicker than other portions and reaches the valve-sliding contact surface.

A control valve includes a casing, a valve body, and a seal cylinder member. The casing has an inlet and an outlet. The valve body is rotatably disposed inside the casing, and has a circumferential wall portion formed with a valve hole providing communication between the inside and the outside. One end portion of the seal cylinder member communicates with the outlet, and a valve sliding contact surface is provided at the other end portion. A flow rate control groove having a bottom surface which is recessed with respect to the outer circumferential surface of the circumferential wall portion and has one end portion continuous with the valve hole is provided on at least one of a front side and a rear side of an edge portion of the valve hole in the circumferential wall portion in a rotating direction of the valve body.

Provided is a flow control valve and a cooling system, with which a pressure loss can be reduced. A rotor 12 includes a first guide portion 43 on the outer circumferential side of an extending portion 42 fixed to a drive shaft 13 and protruding into a space inside the rotor 12. The first guide portion 43 has a radial outer shape which increases from an x-axis positive direction side toward an x-axis negative direction side.

A control valve includes a casing, a valve body, and a seal cylindrical member. The casing includes an inlet and an outlet. The valve body is rotatably disposed inside the casing and includes a circumferential wall portion in which a valve hole that allows the inside and outside to communicate is formed. The seal cylindrical member includes one end portion which communicates with a downstream side of an outlet and the other end portion on which a valve sliding contact surface is provided. In the other end portion of the seal cylindrical member, a protrusion height changes continuously in a circumferential direction along a shape of an outer circumferential surface of the circumferential wall portion. A thick portion which is thicker compared to other portions is provided in a region of the other end portion of the seal cylindrical member at which the protrusion height is high.

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.

Provided is a flow control valve and a cooling system, with which a pressure loss can be reduced. A rotor 12 includes a first guide portion 43 on the outer circumferential side of an extending portion 42 fixed to a drive shaft 13 and protruding into a space inside the rotor 12. The first guide portion 43 has a radial outer shape which increases from an x-axis positive direction side toward an x-axis negative direction side.

Provided is a three-way valve for flow rate control capable of suppressing an increase in driving torque for a valve body, which is caused due to contact between the valve body and a valve port forming member. The three-way valve for flow rate control includes: a valve main body (6) including a valve seat (8), the valve seat (8) having a columnar space and having a first valve port (9), which allows outflow of a fluid and has a rectangular cross section, and a second valve port (18), which allows outflow of a fluid and has a rectangular cross section; first and second valve port forming members (70) (80), which are fitted to the valve main body (6) and form the first valve port (9) and the second valve port (18), respectively; a valve body (34) being provided in a freely rotatable manner in the valve seat (8) of the valve main body (6) so as to simultaneously switch the first valve port (9) from a closed state to an opened state and switch the second valve port (18) from an opened state to a closed state, the valve body (34) having a cylindrical shape and having an opening; a pressure applying portion (94) (96) configured to apply pressures of the fluid leaking through a gap between the valve body (34) and the valve seat (8) to the first and second valve port forming members (70) (80) so as to suppress shift of a position of the valve body (34) when the valve body (34) opens and closes the first valve port (9) and the second valve port (18); and drive means (3) for driving the valve body (34) to rotate.