There is provided an airless paint spray pump wherein the pump is a double acting piston pump having an inlet communicating with a source of paint, a motor for driving the pump, a pressure controller for controlling the pressure of the pressurized paint delivered by the pump, and a filter for filtering the paint delivered by the pump. The pump includes features which increase the accessibility of the components thereof, prevent the incorrect installation of the seal packings in the pump cylinder, and allow the assembly of the piston in the pump cylinder properly aligned with the cylinder so as not to damage the seal packings therein.

System for conveying and dispensing material may include a heated supply of the material, one or more heated hoses, a heated dispenser, and a pump having a heating device internal the pump. A pump for conveying liquid or liquefied material, for example chocolate, may include one or more heating devices disposed within the pump. A filter may also be provided with an optional internal heating device.

A pump having significantly minimized or no ullage for pumping material (fluid or aggregate).

The present invention is related to a bypass plunger. The plunger includes a plurality of flow ports, a cage including a seat, a flow restriction member positioned within the cage, a choke passageway extending between the seat and a lower end of the plunger. The cage is located proximate the flow ports. The flow restriction member is movable between a seated position and an unseated position in response to formation contents flowed into the wellbore from a reservoir. The flow restriction member is the unseated position when the plunger descends down a wellbore and is the seated position when the plunger ascends in the wellbore. The flow ports, cage, and choke passageway are in fluid communication when the flow restriction member is in the unseated position. In the seated position, the flow restriction member is in physical contact with the seat. This configuration provides a bypass plunger with controlled descent.

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

A downhole pump for a reciprocating rod system in a deviated well has a barrel, a plunger, and at least one joint. The plunger is reciprocally moved in the barrel to lift fluid in the well. The barrel has a first valve allowing/restricting fluid passage into/out of the barrel, and the plunger has a second valve allowing/restricting fluid passage into/out of an interior of the plunger. The plunger has a plurality of plunger portions arranged longitudinally. The at least one joint longitudinally interconnects at least two of the plunger portions together. The at least one joint provides fluid communication between portions of the interior of the at least two plunger portions and allows lateral displacement between the at least two plunger portions relative to one another.

A piston pump for a brake including: a piston housing; an outer piston which rectilinearly reciprocates in the piston housing; an inner piston which is coupled to an inner portion of the outer piston, and rectilinearly reciprocates together with the outer piston in a state in which the inner piston is coupled to the inner portion of the outer piston, or rectilinearly reciprocates alone in a state in which the outer piston is stopped; an outer return spring which supports a tip portion of the outer piston; an inner return spring which supports a tip portion of the inner piston; and a piston rod spring which supports rear end portions of the outer piston and the inner piston.

Systems and methods for removing fluid from a subterranean well with a fluid removal system includes lowering an elongated member into tubing of the subterranean well to a lower position, the elongated tubing having a plunger or valve body located at an end, wherein fluid passes past the plunger or through a valve opening as the valve body moves into the subterranean well. The plunger or valve body is moved in a direction out of the subterranean well so that fluid cannot pass the plunger or through the valve opening, moving the fluid out of the subterranean well.