A plunger, a hydraulic end and a plunger pump are disclosed. The plunger includes a plunger body, the plunger body includes a flow channel; a first liquid inlet hole is located in the plunger body and passes through the sidewall of the plunger body; the plunger body includes a first end portion and a second end portion, a flow channel extends from the first end portion to the second end portion, a part of the flow channel close to the first end portion is closed, the flow channel extends to the second end portion and forms a first opening, the first liquid inlet hole is communicated with the flow channel, the first valve assembly is located at the first opening, and is configured to allow fluid to flow out from the flow channel at the first opening and prevent fluid from flowing back to the flow channel from outside.

A piston for a single-stroke pump includes a pump rod, a seal ring extending about the pump rod and having a central bore, and a retaining device disposed on the pump rod and retaining the seal ring on the pump rod. In a forward stroke, the seal ring is in a first position whereby the seal ring sealingly engages the pump rod such that the seal ring and pump rod drive a fluid out of the pump chamber. When transitioning to a return stroke, the seal ring is maintained stationary relative to the pump cylinder until retaining device engages seal ring, such that seal ring is in a second position. With the seal ring in the second position, a flow path is opened between the seal ring and the pump rod, allowing fluid to flow into the pump chamber to prime the pump the next pump cycle.

A mechanically actuated traveling valve for use in fluid pumping equipment. More particularly, a multiple component mechanically actuated traveling plug valve having a valve seat, a valve plug and at least one displaceable valve ring positioned therebetween is provided for use in subsurface positive displacement pumps capable of pumping high viscosity fluids, with any gas to liquid ratio, operating at any inclination angle.

A reciprocating compressor includes a cylinder that defines an inner space, a piston that is located in the inner space of the cylinder and that defines a compression space configured to receive refrigerant, a discharge cover that is coupled to a side of the cylinder and that defines a discharge space configured to receive refrigerant discharged from the compression space, and a valve plate that is located at a side space defined at the side of the cylinder and that partitions the side space into the compression space and the discharge space. The valve plate defines a discharge hole through which the compression space and the discharge space communicate with each other, in which the discharge hole includes an inlet that faces the compression space and an outlet that faces the discharge space. The inlet and the outlet have different shapes.

A piston for a single-stroke pump includes a pump rod, a seal ring extending about the pump rod and having a central bore, and a retaining device disposed on the pump rod and retaining the seal ring on the pump rod. In a forward stroke, the seal ring is in a first position whereby the seal ring sealingly engages the pump rod such that the seal ring and pump rod drive a fluid out of the pump chamber. When transitioning to a return stroke, the seal ring is maintained stationary relative to the pump cylinder until retaining device engages seal ring, such that seal ring is in a second position. With the seal ring in the second position, a flow path is opened between the seal ring and the pump rod, allowing fluid to flow into the pump chamber to prime the pump the next pump cycle.

A mechanically actuated traveling valve for use in fluid pumping equipment. More particularly, a multiple component mechanically actuated traveling plug valve having a valve seat, a valve plug and at least one displaceable valve ring positioned therebetween is provided for use in subsurface positive displacement pumps capable of pumping high viscosity fluids, with any gas to liquid ratio, operating at any inclination angle.

A mechanically actuated traveling valve for use in fluid pumping equipment. More particularly, a multiple component mechanically actuated traveling plug valve having a valve seat, a valve plug and at least one displaceable valve ring positioned therebetween is provided for use in subsurface positive displacement pumps capable of pumping high viscosity fluids, with any gas to liquid ratio, operating at any inclination angle.

The present invention is a superimposed standing valve and related method of harvesting oil and gas using a conventional rod pump equipped with the superimposed standing valve. The superimposed standing valve includes a donut disposed between a top cylinder and a main standing valve such that the donut can slide along the top cylinder a fixed valve stroke. A plurality of openings are sealed and unsealed by the movement of the donut. The superimposed standing valve isolates the pump from the head pressure of the oil and gas inside of the tubing thereby enabling the standing valve of the pump to remain open on both the upstroke and the downstroke. As a result, the superimposed standing valve increases pump efficiency and reduces the risk of gas locking.

A reciprocating compressor includes a cylinder that defines an inner space, a piston that is located in the inner space of the cylinder and that defines a compression space configured to receive refrigerant, a discharge cover that is coupled to a side of the cylinder and that defines a discharge space configured to receive refrigerant discharged from the compression space, and a valve plate that is located at a side space defined at the side of the cylinder and that partitions the side space into the compression space and the discharge space. The valve plate defines a discharge hole through which the compression space and the discharge space communicate with each other, in which the discharge hole includes an inlet that faces the compression space and an outlet that faces the discharge space. The inlet and the outlet have different shapes.

A portable pump includes a cylinder, a nozzle, a valve, a piston rod, a tube, and a pressure sensing device. The nozzle connects with the cylinder and includes a passage connectable with the inflatable. The valve is mounted between the cylinder and the nozzle. The piston rod has a rod hole and is connected with a piston and a handle. The handle includes a recess. The tube is connected with the valve. The pressure sensing device is disposed in the recess. The pressure sensing device can measure a pressure value of the air flowing into the recess and is connectable with a mobile electronic device via wireless transmission for indication.