A liquid sending device includes a plunger pump, which performs an intake operation of liquid to and a discharge operation of liquid from a pump chamber and in which pressure in the pump chamber in a case where the intake operation is performed is lower compared to a case where the discharge operation is performed, a check valve that is provided at an inlet port, has a spherical valve element and a valve seat, and passively operates according to the pressure in the pump chamber in such a direction that the valve element is seated on or detached, a pressure sensor that detects the pressure, and an attachment detector that compares the pressure with a preset threshold value and detect attachment of the valve element to the valve seat in a case where the pressure in the pump chamber is equal to or lower than the threshold value.

A downhole pump used for a reciprocating pump system includes a barrel coupling to a tubing string and having a standing valve and includes a plunger coupling to a rod string and having a traveling valve. One or both of the valves can include an assembly comprising a housing, an insert, a ball, and a seat. The insert allowing for flow therethrough defines a ball stop at one end has a ball passage at the other end. The insert positions in flow passage of the housing, and one of the ends engages a shoulder in the passage. The insert includes sidewalls and a conical body to reduce turbulence, flow velocity, gas breakout, ball chatter, and the like.

A liquid sending device includes a plunger pump, which performs an intake operation of liquid to and a discharge operation of liquid from a pump chamber and in which pressure in the pump chamber in a case where the intake operation is performed is lower compared to a case where the discharge operation is performed, a check valve that is provided at an inlet port, has a spherical valve element and a valve seat, and passively operates according to the pressure in the pump chamber in such a direction that the valve element is seated on or detached, a pressure sensor that detects the pressure, and an attachment detector that compares the pressure with a preset threshold value and detect attachment of the valve element to the valve seat in a case where the pressure in the pump chamber is equal to or lower than the threshold value.

An improved one-piece cage and an improved insert and their assembly create a zero-restriction fluid flow ball check valve. The improved insert for ball and seat valve comprises external screw threads on the base of the insert and have circumferentially spaced ribs extending upwards and converging towards the longitudinal axis of the insert, forming a hemi-spherical ball stop and arched side openings. The inside diameter of the insert bore is substantially equal to the ball valve diameter preventing the ball from rattling when positioned in the improved insert's passageway during the fluid flow. The outside diameter of the ribs is less than the inside diameter of the improved one-piece cage cavity producing a zero-restriction fluid flow ball check valve in comparison to the volumetric fluid flow through the annular seat. The improved cage that receives the improved insert is a one piece in construction and has internal threads that correspond to the external threads on the improved insert. The insert is assembled inside the cage using a screw thread connection and simultaneously forming a fluid seal between the insert and the cage.

An improved one-piece cage and an improved insert and their assembly create a zero-restriction fluid flow ball check valve. The improved insert for ball and seat valve comprises external screw threads on the base of the insert and have circumferentially spaced ribs extending upwards and converging towards the longitudinal axis of the insert, forming a hemi-spherical ball stop and arched side openings. The inside diameter of the insert bore is substantially equal to the ball valve diameter preventing the ball from rattling when positioned in the improved insert's passageway during the fluid flow. The outside diameter of the ribs is less than the inside diameter of the improved one-piece cage cavity producing a zero-restriction fluid flow ball check valve in comparison to the volumetric fluid flow through the annular seat. The improved cage that receives the improved insert is a one piece in construction and has internal threads that correspond to the external threads on the improved insert. The insert is assembled inside the cage using a screw thread connection and simultaneously forming a fluid seal between the insert and the cage.

A disclosure pertains to a reciprocating pump configured for pumping fillers or aggregates or cementitious material and the like.

A disclosure pertains to a reciprocating pump configured for pumping fillers or aggregates or cementitious material and the like.

A ball non-return valve that can be integrated with a diaphragm pump or the like, does not transmit strain generated by stress during valve assembly to a ball seal portion, and can stably maintain sealing performance, and a diaphragm pump are disclosed. The non-return valve includes a valve seat having a through-hole, and a ball that opens and closes a flow of a fluid through the through-hole. The valve seat made of a corrosion resistant material is composed of a first valve seat that can support the ball and seal the through-hole, and a second valve seat that has a substantially cylindrical shape surrounding the first valve seat and in which the space between a valve case and the second valve seat is sealed by an O-ring. Clearances d3 and d4 are formed between the first valve seat and the second valve seat, and a horizontal surface of a notched portion of the second valve seat is mounted on an upper surface of a flange portion of the first valve seat.

A valve assembly for an artificial lift system can include a cage defining a bore therethrough, a valve seat, and a ball disposed within the cage. In a closed position, the ball seals against the valve seat. Upon application of sufficient pressure, the ball lifts from the valve seat to open the valve and allow fluid to flow through the bore. An interior surface of the cage surrounding the bore includes a flow profile that improves fluid flow through the cage. The flow profile can include a plurality of flanges protruding inwardly into the bore from the interior surface and extending helically along a longitudinal length of the cage.

A piston fuel pump for an internal combustion engine includes a pump housing, a piston, and a non-return discharge valve. The non-return discharge valve has a valve element and a guide element configured to guide the movement of the valve element. The guide element is at least indirectly pressed in a radial manner into an opening in the pump housing.