Multiple function valve assembly

Details Multiple function valve assembly Multiple function valve assembly

1982-12-06

1984-12-25

Schwadron, Martin P.

Fluid handling

Systems

With flow control means for branched passages

137883, 137885, F16K 1704

Patent

active

044897588

ABSTRACT:
A valve assembly is provided for a paint color change system for directing paint to spray guns from either of two supply lines selectively while connecting the other line to exhaust, and simultaneously controlling the paint pressure as a function of pilot air pressure. A valve block contains two pairs of poppet valves, each pair having a common inlet chamber connected to one of the paint supply lines and containing a pair of poppets each biased toward a seat for controlling flow to an outlet chamber, and a pilot air operated diaphragm in each outlet chamber coupled with a poppet for regulating the position of the poppet in accordance with the paint pressure in the outlet chamber and pilot air pressure. The outlet chambers are connected to an exhaust line and the paint spray guns respectively so that the two pairs of poppet valves acting in concert under control of two pilot air signals can control which paint line is connected to the spray gun or to the exhaust as well as regulate the pressure or volume of paint flowing to the spray guns.

REFERENCES:
patent: 3009479 (1961-11-01), Flanders et al.
patent: 3348774 (1967-10-01), Wiggins
patent: 3450092 (1969-06-01), Kock
patent: 3870233 (1975-03-01), Wichelm et al.

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