Abstract: A pump assembly. The pump assembly may comprise a motor portion for driving a fluid pumping portion via a piston. The motor portion may comprise: a spool and a spool housing assembly having a spool chamber. The spool may be disposed within the spool chamber. The spool may comprise an upper portion and a lower portion, wherein the diameter of the lower portion is larger than the diameter of the upper portion. The spool may also comprise: (1) two support groove portions for cradling two slide valves and (2) two spool bores, which are in fluid communication with the two slide valves. The piston of the pump assembly may comprise a valve stem having a valve stem bore and valve stem openings. The valve stem openings may be funnel-shaped or may inwardly slope into the valve stem bore to prevent or minimize cutting or shredding of a blown seal.

Abstract: A zero emission reciprocating drive pump. The reciprocating drive pump may comprise: a spool and housing assembly. The housing assembly may comprise a flange, spool housing, first chamber, second chamber, and first seal. The flange may attached to a proximal end of the spool housing. The first chamber may be within the flange. The second chamber may be within the spool housing. The spool may be substantially disposed in and reciprocally movable in the second chamber. A proximal end portion of the spool may move reciprocally into and out of the first chamber. The first seal may be positioned substantially adjacent to the first chamber and the second chamber and may contact the proximal end portion of the spool. The flange may comprise a lip that extends substantially along a width of a distal end of the first seal, such that the first seal does not pop out of place.

Abstract: A pump assembly. The pump assembly may comprise a motor portion for driving a fluid pumping portion via a piston. The motor portion may comprise: a spool and a spool housing assembly having a spool chamber. The spool may be disposed within the spool chamber. The spool may comprise an upper portion and a lower portion, wherein the diameter of the lower portion is larger than the diameter of the upper portion. The spool may also comprise: (1) two support groove portions for cradling two slide valves and (2) two spool bores, which are in fluid communication with the two slide valves. The piston of the pump assembly may comprise a valve stem having a valve stem bore and valve stem openings. The valve stem openings may be funnel-shaped or may inwardly slope into the valve stem bore to prevent or minimize cutting or shredding of a blown seal.

Abstract: A reciprocating drive mechanism. The reciprocating drive mechanism may comprise: a spool assembly and a spool housing. The spool assembly may be reciprocally movable within a spool chamber of the spool housing. The spool housing may comprise a first seal, a second seal, and a third seal. When the spool assembly is within the spool chamber, the first seal, the second seal, and the third seal may divide the spool chamber into a distal chamber, an intermediate chamber, a supply chamber, and a proximal chamber, respectively. The spool assembly may comprise a first spool vent that is in fluid communication with the distal chamber. The spool housing may comprise a first housing vent that is in fluid communication with the intermediate chamber. The first spool vent may be in fluid communication with the first housing vent when an outlet of the first spool vent is aligned within the intermediate chamber.

Abstract: A reciprocating drive mechanism. The reciprocating drive mechanism may comprise: a spool assembly and a spool housing. The spool assembly may be reciprocally movable within a spool chamber of the spool housing. The spool housing may comprise a first seal, a second seal, and a third seal. When the spool assembly is within the spool chamber, the first seal, the second seal, and the third seal may divide the spool chamber into a distal chamber, an intermediate chamber, a supply chamber, and a proximal chamber, respectively. The spool assembly may comprise a first spool vent that is in fluid communication with the distal chamber. The spool housing may comprise a first housing vent that is in fluid communication with the intermediate chamber. The first spool vent may be in fluid communication with the first housing vent when an outlet of the first spool vent is aligned within the intermediate chamber.

Abstract: A zero emission reciprocating drive pump. The reciprocating drive pump may comprise: a spool and housing assembly. The housing assembly may comprise a flange, spool housing, first chamber, second chamber, and first seal. The flange may attached to a proximal end of the spool housing. The first chamber may be within the flange. The second chamber may be within the spool housing. The spool may be substantially disposed in and reciprocally movable in the second chamber. A proximal end portion of the spool may move reciprocally into and out of the first chamber. The first seal may be positioned substantially adjacent to the first chamber and the second chamber and may contact the proximal end portion of the spool. The flange may comprise a lip that extends substantially along a width of a distal end of the first seal, such that the first seal does not pop out of place.

Abstract: A pilot control valve for controlling a reciprocating pump has a valve member shiftable within a valve body between a first or “downstroke” position and a second or “upstroke” position. In its first and second positions, the valve member positions slide valves to allow communication of control fluid to move the piston to a second and first position, respectively. When the piston reaches its second position a poppet disposed in a rod attached to the piston allows control fluid acting on the valve member to depressurize. Pressurized control fluid then acts on the valve member to move to its second position. When the piston returns to its first position, the poppet allows pressurized control fluid acting on the upper surface of the piston to act on the valve member to move the valve member back to its first position and repeat the process.

Abstract: A pilot control valve for controlling a reciprocating pump having a valve member shiftable within a valve body between a first or “downstroke” position and a second or “upstroke” position. When the valve member is in its first position, the valve member positions a pair of slide valves to allow communication of control fluid to the lower surface of a piston to move the piston from a first position to a second position. As the piston reaches its second position, a poppet disposed in a rod attached to the piston allows control fluid acting on the valve member to depressurize. As such control fluid is depressurized, pressurized control fluid acts on the valve member to move the valve member from its first position to its second position.

Abstract: A pilot control valve for controlling a reciprocating pump having a valve member shiftable within a valve body between a first or “downstroke” position and a second or “upstroke” position. When the valve member is in its first position, the valve member allows communication of control fluid to the lower surface of a piston to move the piston from a first position to a second position. As the piston reaches its second position, a vent in a rod attached to the piston allows control fluid acting on the valve member to depressurize. As such control fluid is depressurized, pressurized control fluid acts on the valve member to move the valve member from its first position to its second position. In its second position, the valve member blocks communication of the control fluid to the lower surface of the piston and allows communication of the control fluid to the upper surface of the piston causing the piston to return to its first position.

Abstract: A pilot control relay valve to change the directional flow of fluid to a piston (such as, for example, the piston of a chemical injection pump for injecting chemicals at a slow or rapid rate over a long period of time), but also allow the recovery of exhaust fluids under significant back pressure. The pilot control relay valve comprises an elongated valve member shiftable within a valve body between a first and second position. The first position allows communication of control fluid to a first pressure receiving surface while allowing exhausting of fluid from a third or opposing pressure receiving surface, thereby to initiate movement of the valve member against the back pressure of the exhaust fluid from its first position to a position equalizing the pressure acting on a second pressure receiving surface with the pressure of the control fluid, thereby causing the valve member to move to its second position.

Abstract: A check valve is disclosed for permitting a fluid flow in a generally one direction. The check valve is provided with an elongated housing with a central passageway within which a valve member moves for permitting a fluid flow in one direction and for closing a fluid communication when moving in an opposite direction. The valve member has a conically-shaped groove for receiving a sealing member therein. When the sealing member becomes expanded under the influence of fluids passing through the check valve, it is allowed to move from the groove along a neck of the valve member. The interior wall housing is provided with plurality of longitudinal grooves extending in parallel relationship to a central axis of the housing in that part of the housing wherein the valve member moves. The longitudinal grooves ensure fluid flow through the valve member at all times.