Fluid sprinkling – spraying – and diffusing – With system fluid relief or return to supply
Patent
1981-02-05
1982-12-28
Love, John J.
Fluid sprinkling, spraying, and diffusing
With system fluid relief or return to supply
239332, 417387, B05B 903
Patent
active
043657451
ABSTRACT:
A hydraulically actuated pump of the piston-diaphragm type for pumping a liquid such as paint through an airless spray gun having a flexible hose which is connected to the pump outlet downstream of the outlet check valve and which has a volumetric capacity many times the displacement of the diaphragm actuating piston to constitute an elastically expansible and contractible pressure storage vessel. The driving fluid chamber of the pump between the piston and diaphragm has a restricted adjustable pressure control valve to control the operating pressure of the pump and an automatic hydraulic inlet-outlet valve operative upon arrest of the return movement of the diaphragm, to admit driving fluid from a reservoir into the driving fluid chamber during the continued terminal portion of return stroke of the piston and to permit expulsion of driving fluid from the driving fluid chamber to the reservoir during the initial portion of the pressure stroke of the piston to adjust the volume of hydraulic fluid between the piston and diaphragm thus to maintain a predetermined rate of discharge of the pumped liquid through the spray gun during the pressure and return strokes of the diaphragm and piston. During the return stroke of the diaphragm and piston, the outlet check valve closes so that continued return movement of the piston draws the diaphragm with it to the stop position to draw in through an inlet check valve liquid to be pumped during the next pressure stroke of the piston and diaphragm.
In standby operation of the pump with continued reciprocation of the piston, the pressure control valve opens to decrease the volume of driving fluid to correspond to the net displacement of the diaphragm for continued back and forth flow of pumped liquid into and from the pressure storage vessel, the outlet check valve being of light weight material having a specific gravity only slightly greater than that of the liquid being pumped and having a relatively large opening movement so that it does not engage its seat during the back and forth movements of the piston and diaphragm during standby operation.
REFERENCES:
patent: 3141303 (1964-07-01), Baldwin
patent: 3285182 (1966-11-01), Pinkerton
patent: 3788554 (1974-01-01), Guise
patent: 3884598 (1975-05-01), Wanner
Forman Michael J.
Love John J.
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