Fluid handling – Self-proportioning or correlating systems – Self-controlled branched flow systems
Patent
1987-10-21
1989-04-04
Cohan, Alan
Fluid handling
Self-proportioning or correlating systems
Self-controlled branched flow systems
13762414, 13762418, 55273, 91417R, B01D 4604
Patent
active
048176613
ABSTRACT:
A series of filter backflushing valves are connected to a pressurized air storage tank and are sequentially opened at selectively variable time intervals by a piston and stepping cam structure reciprocably disposed within a cyclic control device intermittently pressure actuated by a backflushing pressure control valve which controls pressurized air flow from the tank to the control device, to actuate the same, through an actuating conduit by automatically opening when the tank pressure reaches a desired backflushing pressure level established by the valve setting. The lapse time between sequential backflushing valve openings may be varied independently of the selectively variable backflushing pressure by adjustment of the flow rate of pressurized supply air into the tank through a main supply conduit. Such flow rate adjustment is preferably effected by connecting the supply conduit to an available source of high pressure air and installing a pressure regulating valve and a fixed downstream orifice in the supply conduit and then adjusting the regulating valve to selectively vary the time required to raise the tank pressure from ambient pressure to the desired backflushing pressure etablished by the pressure control valve. The orifice establishes an essentially linear relationship between the regulating valve setting and the desired lapse time. A portion of the pressurized tank air intermittently discharged through the control valve is flowed into a reset pressure reservoir which uses the pressurized air received therein to automatically drive the piston and the cam structure back to a reset position thereof after it has caused the opening of one of the backflushing valves.
REFERENCES:
patent: 3916768 (1975-11-01), Mortin
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