Airless sprayer with adjustable pressure unloading valve

Details Airless sprayer with adjustable pressure unloading valve Airless sprayer with adjustable pressure unloading valve

1991-07-19

1992-11-17

Smith, Leonard E.

Pumps

Motor driven

Fluid motor

921692, F04B 4306

Patent

active

051638207

ABSTRACT:
A pressure unloading valve responsive primarily to the pressure of the outlet passage in a diaphragm pump. The pump includes a driving fluid chamber and a pump chamber separated by a flexible diaphragm. Between the pump chamber and the outlet passage is a check valve allowing fluid flow only from the pump chamber to the outlet passage. The unloader valve is unseated, allowing relief of fluid pressure in the driving fluid chamber, when the pressure in the outlet passage exceeds a first predetermined value or when the pressure in the driving fluid chamber exceeds a second predetermined value. An adjustment knob is provided to vary the first and second predetermined values. An anti-blow-by seal is provided to check fluid seepage from the driving fluid chamber to the sump.

REFERENCES:
patent: 3338170 (1967-08-01), Swartz
patent: 3416453 (1968-12-01), Feuillebois et al.
patent: 3433161 (1969-03-01), Vetter
patent: 3671150 (1972-06-01), Jackson et al.
patent: 3680981 (1972-08-01), Wagner
patent: 3779384 (1973-12-01), Stahlkopf
patent: 3961860 (1976-06-01), Ernst
patent: 4019837 (1977-04-01), Eull
patent: 4022381 (1977-05-01), Karliner
patent: 4184809 (1980-01-01), Kelley
patent: 4353684 (1982-10-01), Christman
patent: 4378201 (1983-03-01), Quarve
patent: 4403924 (1983-09-01), Gebauer et al.
patent: 4564340 (1986-01-01), Stahlkopf
patent: 4619589 (1986-10-01), Muller et al.

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