Fuel pump for a direct injection system provided with a common rail. The fuel pump has a pumping chamber defined in a main body; a piston which is mounted in a sliding manner inside the pumping chamber to cyclically vary the volume of the pumping chamber; an intake channel which originates from a wall of the pumping chamber; an intake valve which is coupled to the intake channel; a delivery channel which originates from a wall of the pumping chamber; a delivery valve which is coupled to the delivery channel; and an actuating spring which has a plurality of turns having a pitch that varies between the turns and that is coupled to the piston so as to push the piston towards a maximum volume or minimum volume position of the pumping chamber.

A water pump assembly includes a lower housing configured for being positioned within a well. The lower housing includes a bladder therein. The bladder expands to force water within the housing into an outlet of a valve apparatus and the bladder contracts to draw water into the housing. A cylinder and piston fluidly coupled to an inlet of the valve apparatus and the inlet is fluidly coupled to the bladder. A one way valve is positioned within the valve apparatus and fluidly connects an inlet chamber including the inlet to an outlet chamber including the outlet. The one way valve allows water to flow from the outlet chamber into the inlet chamber and restricts water from flowing from the inlet chamber into the outlet chamber. An outlet conduit is fluidly coupled to the outlet of the valve apparatus to carry the water where desired.

A Y-tool is configured for use with a pumping system that includes an electric submersible pump and bypass tubing. The Y-tool includes a slave valve assembly that controls access to the bypass tubing. The Y-tool also includes a master valve assembly driven by pressure from the electric submersible pump and a linkage assembly connected between the master valve assembly and the slave valve assembly.

A system and method for pumping formation fluids from a well using a sucker rod pumping system that prevents the pumping system from experiencing a floating rod condition. The sucker rod pumping system comprises a pump drive system, a rod string, and a downhole reciprocating pump driven by the rod string. The pump drive system is coupled to the rod string by a bridle. In addition, the sucker rod pumping system comprises a drive control system that controls the speed of the pump drive system during the downstroke. The drive control system is coupled to a load cell configured to provide a signal representative of load on the rod string. The drive control system controls the speed of the pump drive system during the downstroke based on the load on the rod string so that the rod string does not experience a floating rod condition.

The present disclosure discloses a reducing noise double-channel oil pump including a pump body. The pump body connects an oil box and an actuator. Parallel distributed a small and a big flow oil channels are located between the oil box and the actuator. The small flow oil channel connects a first twin pump and first one-way valves. The big flow oil channel connects a second twin pump and second one-way valves. The pump body also disposes a reducing noise oil channel. A connection of the reducing noise oil channel and the big flow oil channel locates a one-way controlled valve. Another end of the reducing noise oil channel connects an oil pressure feedback oil way. A connection of the reducing noise oil channel and the oil pressure feedback oil way locates an oil pressure driving mechanism. The middle of the reducing noise oil channel connects an unloading oil way.

A discharge valve of a high-pressure pump is placed in a discharge passage and is openable to enable flow of fuel from a pressurizing chamber to a discharge outlet in response to a fuel pressure difference between the pressurizing chamber side and the discharge outlet side. A relief is placed in a relief passage. The relief passage communicates between a branching portion, which is located on a side of the discharge valve where the discharge outlet is placed in the discharge passage, and a return portion, which merges with a damper chamber. The relief valve is openable to enable flow of the fuel from the branching portion to the return portion in response to a fuel pressure difference between the branching portion side and the return portion side. A discharge passage orifice is placed between the discharge valve and the branching portion in the discharge passage and constricts a flow passage cross-sectional area of the discharge passage.

A check valve assembly includes a housing extending axially along a center axis of the check valve assembly from a first end to a second end. The housing can include an opening disposed at the first end and an outlet disposed at the second end. A seat is disposed in the opening and connected to the tubular housing. The seat includes an inlet extending axially through the seat. A ball is disposed inside the tubular housing and disposed axially between the seat and the outlet. The ball is larger in diameter than the inlet. A ball guide is disposed inside the tubular housing and is disposed axially between the ball and the outlet. A spring is disposed inside the tubular housing and disposed axially between the ball guide and the outlet. The spring is compressed between the ball guide and the outlet.

Provided is a high-pressure fuel pump that ensures oil tightness even at high fuel pressure and has a small and lightweight inexpensive discharge valve structure. Therefore, a high-pressure fuel pump according to the present invention includes: a discharge valve arranged on a discharge side of a pressurizing chamber; a discharge valve seat on which the discharge valve is seated; and a facing member configured independently as a separate member from the discharge valve seat and located on an opposite side of the discharge valve seat with the discharge valve interposed therebetween, in which a stroke direction regulating portion that regulates displacement of the discharge valve in a stroke direction is formed on a tapered surface of the facing member.

A pump including a pump body and an intake valve attached to the pump body, connected to a source of a coating product, the intake valve including a valve body and a valve shutter. The valve body includes a first component secured to the pump body, and a second component screwed to the first component and including a valve-shutter support situated radially toward the inside of the first component and forming a seat of the valve to collaborate with the valve shutter to establish sealing, the second component also including a nut, attached to the valve-shutter support, extending radially around an end part of the first component, this end part having an external screw thread collaborating with an internal screw thread of the nut, and when the nut has been unscrewed from the first component, the second component and the valve shutter may be extracted from the first component.

A positive displacement pump includes a housing surrounding a drive chamber and a diaphragm compartment. A drive element is inside the drive chamber. A diaphragm is inside the diaphragm compartment and divides the diaphragm compartment into a fluid chamber and a cavity. A shaft connects the drive element and the diaphragm. A breather valve is fluidically connected to the cavity and is configured to allow air to exit the cavity. The cavity is fluidically disconnected from the drive chamber.