A pump fluid end comprising a discharge valve assembly comprising a discharge valve seat and a discharge valve body, a suction valve assembly comprising a suction valve seat and a suction valve body, and a reciprocating element, wherein an inside diameter of the discharge valve seat is greater than an outside diameter of the suction valve body, the suction valve seat, the reciprocating element, or a combination thereof.

A pump comprising a pump fluid end having a reciprocating element bore; a reciprocating element having a front end opposite a fluid intake end and comprising a peripheral wall defining a hollow cylindrical body; a movable manifold comprising a reciprocating element end fluidly connected with the fluid intake end of the reciprocating element, whereby the reciprocating element end of the movable manifold moves in a same axial direction as the reciprocating element during reciprocation of the reciprocating element within the pump fluid end, and a fluid intake end configured for fluid coupling with a stationary fluid manifold such that fluid can be introduced into the movable manifold via the stationary fluid manifold and the fluid intake end of the movable manifold; and a power end operatively connected to the reciprocating element and operable to reciprocate the reciprocating element in the pump fluid end.

A valve seat comprising a primary retention component to retain the valve seat in a valve seat housing upon seating of the valve seat in the valve seat housing, and a secondary retention component to at least temporarily retain the valve seat in the valve seat housing during seating of the valve seat in the valve seat housing, whereafter the valve seat is primarily retained in the valve seat housing via the primary retention component.

A valve poppet assembly comprising a valve stem, a poppet insert retainer, and a poppet seat, wherein, in an assembled configuration, the valve stem extends along a central axis through the poppet insert retainer and the poppet seat, and wherein the valve stem, the poppet insert retainer, and the poppet seat are not a single, integral component.

A reciprocating element includes a cylindrical body having a front end opposite a tail end, and a central axis. The tail end of the cylindrical body is configured to be operatively connected to a pump power end that reciprocates the reciprocating element along a path within a bore of a pump fluid end during operation of a pump. The front end of the cylindrical body includes one or more tool engagement features positioned about an outer circumference of the front end of the cylindrical body of the reciprocating element and adapted to engage a corresponding one or more reciprocating element engagement features of a reciprocating element end of a tool. The reciprocating element can be rotated, pulled, and/or pushed via the tool relative to the central axis of the cylindrical body.

A valve assembly for regulating the flow of working fluid between a working chamber of a fluid working machine and a working fluid gallery comprises: a valve comprising a valve member and one or more cooperating valve seats; an actuator actuatable to apply a force to urge the valve member away from or towards the one or more valve seats; and a coupling between the actuator and the valve member. The coupling comprises a connector located at least partially within a tube. A connector void provided between at least a portion of the connector and the tube is in fluid communication with a working fluid gallery outlet.

A fluid control device includes a pump and an external structure. The pump includes an actuator, a top portion opposed to the actuator such that a gap is disposed therebetween in the thickness direction, and a side wall plate extending from the top portion in the thickness direction and supporting a vibration member. The actuator includes the plate-like vibration member and a piezoelectric element configured to cause the vibration member to vibrate in the thickness direction. The top portion includes a projection portion and a fixation portion projecting beyond the side wall plate in an outward direction perpendicular to the thickness direction. The top portion is fixed to an external structure outside the projection portion.

A valve for a positive displacement pump, a valve seat, a valve body for use therewith, and a pump comprising such a valve are described. The valve comprises a valve body and a valve seat each having engagement surfaces which are configured, in use, to at least partially engage with one another when the valve is in a closed position to thereby mitigate fluid flow therethrough. The valve body is movable, in use, relative to the valve seat along a linear path of motion from the closed position to an open position, wherein at least a peripheral portion of the engagement surface of the valve body extends at an obtuse angle relative to the linear path of motion in the direction of motion from the closed position to the open position and wherein the length of the peripheral portion is at least 13% of the length of the engagement surface.

When a condition for reducing a noise caused in the high-pressure pump is satisfied, a reduction control unit implements a noise reduction control to supply a smaller power to reduce a moving speed of a movable portion in a close acting direction to put a valve body into a closed state for a predetermined time after an energization start timing of a solenoid in a plunger rising period. A closing control unit causes a closing current, which is a constant current for surely putting the valve body into the closed state, to flow the closing current in the solenoid when the noise reduction control is completed in the plunger rising period. The predetermined time is shorter than an energization period in which a current flows in the solenoid.

Disclosed is a check valve reliably closing a fluid path without the need of machining with high accuracy. The check valve includes a pair of members with clamping surfaces; and a valve body clamped by the clamping surfaces from both sides in a thickness direction of the valve body. The valve body is formed from an elastic body and includes an outer frame, a sealing part arranged inside the outer frame and configured to open and close a fluid path formed in one of the pair of members, and a coupling part configured to allow fluid to pass therethrough in the thickness direction and configured to couple the outer frame and the sealing part to each other. The outer frame has a thickness larger than an interplane dimension between the clamping surfaces when the pair of members are joined together.