Airless paint sprayer outlet check valve
AssigneeCampbell Hausfeld/Scott Fetzer Company
InventorRoger Conatser
Life of this patent
Estimating the term…
Abstract
An airless paint sprayer includes an outlet check valve assembly having a dual spring configuration which allows for increased fluid flow through the valve without diminishing response time of the valve or the priming operations of the system. One of the springs is not engaged when the valve is closed and the other spring has a much lower spring rate and biases the valve toward a closed configuration when the valve is open, closed, and all positions therebetween. The dual spring configuration accommodates highly viscous fluids or paints with maximum fluid flow and no detrimental impact on the priming operations of the sprayer.
Claims19
A sprayer for spraying fluids of varying viscosities from a receptacle comprising:
- a suction tube having a first end inserted into the fluid within the receptacle;
- a pump operatively connected to a second end of said suction tube;
- an outlet check valve operatively connected to said pump;
- and
- a nozzle operatively connected to said outlet check valve such that during operation of the sprayer said pump draws the fluid from the receptacle through said suction tube and pumps the fluid through said outlet check valve and to said nozzle for spraying;
- said outlet check valve regulating flow of said fluid to said nozzle and being biased toward a closed position, said outlet check valve further comprising a first spring which engages said outlet check valve when in an open position to bias said outlet check valve toward said closed position, said outlet check valve being biased toward said closed position when in said open position with a greater force than when said outlet check valve is in said closed position.
An outlet for a pump of an airless paint sprayer having a suction tube supplying paint from a paint source through the pump to a spray nozzle, the outlet comprising:
- a valve being biased toward a closed position to prevent paint from flowing through the outlet, paint being permitted to flow through the outlet when said valve is in an open position;
- and
- a first spring engaging said valve in said open position and biasing said valve toward said closed position,
- wherein said valve is biased toward said closed position when in said open position at a greater rate than when said outlet check valve is in said closed position.
An airless sprayer having a pumping chamber, an outlet check valve and a spray liquid path operably connected between said outlet check valve and an outlet of spray liquid, the improvement comprising:
- a spring assembly on said outlet check valve to permit sufficient flow of the spray liquid when said outlet check valve is in an opened configuration for spray liquid to flow therethrough, said spring assembly providing a greater spring force to bias said outlet check valve toward a closed configuration when said outlet check valve is in said open configuration than when said outlet check valve is in said closed configuration.
An airless sprayer having a pumping chamber, an outlet check valve and a spray liquid path operably connected between said outlet check valve and an outlet of spray liquid, the improvement comprising:
- a dual spring assembly on said outlet check valve, said dual springs combining to provide greater spring force to close said outlet check valve when said outlet check valve is in an open configuration than a closed configuration.
Dependencies are inferred from the claim text.