Abstract: A drive system for a pump includes a housing defining an internal pressure chamber, a working fluid disposed within and charging the internal pressure chamber, and a reciprocating member disposed within the internal pressure chamber. A fluid displacement component has first and second surfaces. The first surface is configured to contact the working fluid and the second surface is configured to contact the process fluid. The area of the first surface is greater than the area of the second surface. A pull extends between and connects the reciprocating member and the fluid displacement component. The pull mechanically transfers a pulling force from the reciprocating member to the fluid displacement component.

Abstract: A drive system for a pump includes a housing, first and second fluid displacement members, a solenoid disposed within the housing, and a reciprocating member configured to be driven by the solenoid. The reciprocating member is connected to the first and second fluid displacement members and is configured to mechanically displace the first and second fluid displacement members.

Abstract: A drive system for a pump includes a housing defining an internal pressure chamber, a working fluid disposed within and charging the internal pressure chamber, and a reciprocating member disposed within the internal pressure chamber. The reciprocating member has a pull chamber. A pull is secured within the pull chamber, and a fluid displacement member is coupled to the pull.

Abstract: A method of displacing fluid includes pulling a pump displacement member through a suction stroke with a pull, the pull configured to transmit only tensile forces to the fluid displacement member. A working fluid disposed in an internal pressure chamber drive the fluid displacement member through a pumping stroke. The pull is prevented from transmitting any compressive forces to the fluid displacement member, such that the pull does not drive the fluid displacement member through the pumping stroke.

Abstract: A fluid dispensing device includes a housing and a reciprocating piston fluid pump coupled to the housing. The reciprocating piston fluid pump includes a piston disposed within a cylinder. The piston is configured to pressurize at least one pumping chamber. A motor is coupled to the housing and connected to the reciprocating piston fluid pump to actuate the piston. A wobble assembly connects the motor to the piston of the reciprocating piston fluid pump. A spray tip connected to an outlet of the at least one pumping chamber.

Abstract: A fluid dispensing device comprises a housing body, a fluid container, a reciprocating piston fluid pump, a primary drive element and a spray tip. The housing body is configured to be carried and supported by an operator of the hand held airless fluid dispensing device during operation. The fluid container is supported by the housing body. The reciprocating piston fluid pump is coupled to the housing body and comprises at least two pumping chambers configured to be actuated out of phase by at least one piston. The primary drive element is coupled to the housing body and connected to the reciprocating piston fluid pump to actuate the at least one piston. The spray tip is connected to an outlet of at least one of the pumping chambers.

Abstract: A fluid dispensing device includes an electrostatic discharge protection system. Accumulation and discharge of electrostatic energy created by operation of the device is reduced or prevented by the electrostatic discharge protection system without an earth ground connection. The electrostatic discharge protection system may include a number of features, such as a static wick, nonconductive components that electrically isolate the spray tip of the device, nonconductive isolation barriers, nonconductive fluid reservoir and suction tube components, a nonconductive coating of a control valve component, and a nonconductive spring retainer of the control valve.

Abstract: A drive system for a pump includes a first housing defining an internal pressure chamber, a working fluid disposed within and charging the internal pressure chamber, a second housing disposed within the first housing, a solenoid disposed within the second housing, a reciprocating member slidably disposed within the solenoid, a pull housing integral with a first end of the reciprocating member, the pull housing defining a pull chamber, a pull disposed within the pull chamber, and a fluid displacement member coupled to the pull.

Abstract: A check valve comprises a housing, a fluid passage, a seat, a valve member and a stop. The fluid passage extends through the housing. The seat is disposed in the fluid passage. The valve member is positioned in the passage to engage the seat. The stop extends through the housing to engage the valve member. The stop is accessible from outside the housing to adjust a distance the valve member can travel from the seat. In one embodiment, the stop includes a variable stop feature, such as an offset pin or a cam. In another embodiment, the stop includes a pump control valve. In yet another embodiment, the housing includes markings to indicate a position of the stop. The valve member comprises a ball or a poppet in different embodiments.

Abstract: A drive system for a pump includes a first housing defining an internal pressure chamber, a working fluid disposed within and charging the internal pressure chamber, a second housing having a first and second pumping chambers and an aperture through an end of the second housing, a reciprocating member slidably disposed between the first pumping chamber and the second pumping chamber, a pull housing integral with the reciprocating member and projecting through the aperture, a first sealing member disposed around a circumference of the reciprocating member, a second sealing member disposed around a circumference of the aperture, the pull housing defining a pull chamber, a pull disposed within the pull chamber, and a fluid displacement member coupled to the pull.

Abstract: A double displacement pump includes an inlet manifold, an outlet manifold, a first fluid cavity between the inlet manifold and the outlet manifold, a second fluid cavity between the inlet manifold and the outlet manifold, and a drive system that includes a housing defining an internal pressure chamber, a piston disposed within the internal pressure chamber and having a first and second pull chambers and a central slot for receiving a drive, a first pull with a free end slidably secured within the first pull chamber and a second pull with a free end slidably secured within the second pull chamber, and a first fluid displacement member coupled to the first pull and a second fluid displacement member coupled to the second pull.

Abstract: A check valve comprises a housing, a fluid passage, a seat, a valve member and a stop. The fluid passage extends through the housing. The seat is disposed in the fluid passage. The valve member is positioned in the passage to engage the seat. The stop extends through the housing to engage the valve member. The stop is accessible from outside the housing to adjust a distance the valve member can travel from the seat. In one embodiment, the stop includes a variable stop feature, such as an offset pin or a cam. In another embodiment, the stop includes a pump control valve. In yet another embodiment, the housing includes markings to indicate a position of the stop. The valve member comprises a ball or a poppet in different embodiments.

Abstract: A method of displacing fluid includes pulling a pump displacement member through a suction stroke with a pull, the pull configured to transmit only tensile forces to the fluid displacement member. A working fluid disposed in an internal pressure chamber drive the fluid displacement member through a pumping stroke. The pull is prevented from transmitting any compressive forces to the fluid displacement member, such that the pull does not drive the fluid displacement member through the pumping stroke.

Abstract: A fluid dispensing device comprises a housing body, a fluid container, a reciprocating piston fluid pump, a primary drive element and a spray tip. The housing body is configured to be carried and supported by an operator of the hand held airless fluid dispensing device during operation. The fluid container is supported by the housing body. The reciprocating piston fluid pump is coupled to the housing body and comprises at least two pumping chambers configured to be actuated out of phase by at least one piston. The primary drive element is coupled to the housing body and connected to the reciprocating piston fluid pump to actuate the at least one piston. The spray tip is connected to an outlet of at least one of the pumping chambers.

Abstract: A double displacement pump includes an inlet manifold, an outlet manifold, a first fluid cavity between the inlet manifold and the outlet manifold, a second fluid cavity between the inlet manifold and the outlet manifold, and a drive system that includes a housing defining an internal pressure chamber, a piston disposed within the internal pressure chamber and having a first and second pull chambers and a central slot for receiving a drive, a first pull with a free end slidably secured within the first pull chamber and a second pull with a free end slidably secured within the second pull chamber, and a first fluid displacement member coupled to the first pull and a second fluid displacement member coupled to the second pull.

Abstract: A portable airless sprayer comprises a housing, a motor, a pump, a spray tip and a trigger. The motor is mounted to the housing. The pump is mounted to the housing and is driven by the motor. The spray tip assembly receives pressurized fluid from the pump. The trigger is configured to actuate the spray tip assembly and activate the motor. A method of operating a portable airless sprayer comprises moving a lever over a stroke, displacing a valve pin, and activating a motor. The valve pin is displaced with the lever to actuate a spray valve. The motor is activated with the lever to drive a pump that provides fluid to the spray valve.