Pressure compensated fluid flow regulator

Fluid handling – Line condition change responsive valves – With separate connected fluid reactor surface

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Details

137501, G05D 703

Patent

active

045495726

ABSTRACT:
A fluid flow regulator for fluids containing fine solids in suspension, such as paint, has a sharp-edged orifice to meter fluid in accordance with pressure across the orifice. The pressure is determined by throttling action of a main poppet valve carried by a spool and controlled by three diaphragms. Valve opening pressures on the diaphragms are downstream fluid pressure, and pilot air pressure while valve closing diaphragm forces are applied by the regulated fluid pressure downstream of the poppet. This regulator is fully pressure-compensated for variations in downstream pressure. Valve leakage is positively prevented by applying pilot air pressure in a manner to seat the poppet valve. Valve flushing at a high flow rate is permitted by a second poppet which carries the sharp-edged orifice and opens to allow a bypass of the orifice during flushing. Flushing action is actuated by high pilot air pressure forcing the main poppet valve to full open position.

REFERENCES:
patent: 2602467 (1952-07-01), Griswold
patent: 3028876 (1962-04-01), Gratzmuller
patent: 3482592 (1969-12-01), Johnson
patent: 3794060 (1974-02-01), Perkins
patent: 4368852 (1983-01-01), Sharp
patent: 4497341 (1985-02-01), Wright

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