Pressure responsive, pilot actuated, modulating valve
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 13, 1987
Grant Date -
N/A
app pub date -
Jul 11, 1984
filing date -
Jul 11, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The pressure responsive, pilot actuated, modulating valve comprises a main valve assembly which defines with the housing a first chamber and controls flow of fluid from an inlet port to an outlet port. A pressure responsive piston is provided which defines with the housing a second chamber. A vent passageway is provided in the piston for communicating the second chamber with the outlet port. A pilot valve assembly is provided to control flow through the vent passageway. A means is provided for selectively actuating the pilot valve assembly. A discharge orifice is comprised in the main valve assembly for communicating the vent passageway with the outlet port. A vent valve assembly is disposed to control flow of fluid between the first chamber and the discharge orifice. A restricted conduit means is disposed to coact with the main valve assembly to provide a variable flow area communicating the inlet port with the discharge orifice and the first chamber when the vent valve assembly and the main valve assembly are in an open position and which flow area varies in direct proportion to the amount the main valve assembly is open to thereby vary fluid pressure in the first chamber and provide forces on the main valve assembly which act counter to the direction of movement of the main valve assembly.
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