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 handheld airless fluid dispensing device comprises a pump, a drive element and an orifice element. The pump directly pressurizes a fluid. The drive element supplies power to the pump. The orifice element is connected to the pump and atomizes un-thinned architectural coating to a particle size of no greater than approximately 150 microns. The pump generates orifice pressures up to approximately 2.48 MPa and the orifice has an area of approximately 18.7 mm2. In one embodiment, the pump, drive element and orifice element are integrated into a handheld housing. In one embodiment, the pump comprises a reciprocating piston fluid pump comprising at least two pumping chambers configured to be actuated out of phase by at least one piston. In another embodiment, the reciprocating piston fluid pump comprises two pistons having different displacements that are linearly actuated by a wobble assembly driven by a gear reducer and an electric motor.

Abstract: A handheld airless fluid dispensing device comprises a pump, a drive element and an orifice element. The pump directly pressurizes a fluid. The drive element supplies power to the pump. The orifice element is connected to the pump and atomizes un-thinned architectural coating to a particle size of no greater than approximately 150 microns. The pump generates orifice pressures up to approximately 2.48 MPa and the orifice has an area of approximately 18.7 mm2. In one embodiment, the pump, drive element and orifice element are integrated into a handheld housing. In one embodiment, the pump comprises a reciprocating piston fluid pump comprising at least two pumping chambers configured to be actuated out of phase by at least one piston. In another embodiment, the reciprocating piston fluid pump comprises two pistons having different displacements that are linearly actuated by a wobble assembly driven by a gear reducer and an electric motor.

Abstract: A propulsion unit 10, used to propel a line striper, is provided with a gasoline engine 12 which may have either a pull/recoil or an electrical starter. Engine 12 is connected via a centrifugal clutch 14 of a known type to a hydraulic pump 16 which includes a hydrostatic drive unit 18. In the preferred embodiment, the clutch 14 is designed to engage between the cranking speed and the idle speed.

Abstract: The frame 12 of a gas hydraulic sprayer 10 has a rear bumper 12a to be tilted up so that the immersion or suction tube 14 clears a paint container and rests on the bumper 12a. The hydraulic motor 16 consists of a piston 38 with a magnet 41, two sensors 47, a solenoid valve 32 and a microprocessor 18 which directs fluid through a solenoid operated valve 32 to the top or bottom of the piston 38. A secondary cooler or radiator 20 is made of tubing and attached to the hydraulic pump case 22 and routed in front of the fan and back to the oil reservoir.