Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
Patent
1992-04-20
1993-04-06
Rosenthal, Arnold
Valves and valve actuation
Fluid actuated or retarded
Pilot or servo type motor
251 31, 13762565, F16K 3142, F16K 136
Patent
active
051996847
ABSTRACT:
A self-cleaning valve for discharge of a pressurized dissolved air flotation aqueous treatment liquid from a high pressure reservoir to a low pressure body of liquid to be treated is provided. The valve includes a discharge head body adapted to be attached to a conduit supplied with pressurized treatment liquid which is provided with a central opening for discharge of a treatment liquid. The opening is controllable by means of a reciprocable cap positioned to reciprocate from a position whereon it restricts flow of liquid through the opening to a position wherein flow in unrestricted. The cap is attached to a reciprocable piston rod attached at its opposite end to a piston that is movable within an enclosed cylinder. The cylinder is provided with a port or opening on each side of said piston into which a source of pressurized air connectable to cause movement of the piston and thus opening and closing of the valve by selectively directing the flow of said pressurized air to either side of the piston. A variable pressure regulating means can be provided to regulate the amount of flow through the valve.
REFERENCES:
patent: 1025559 (1912-05-01), Bliss
patent: 2830785 (1958-04-01), Buri
patent: 3907248 (1975-09-01), Coulbeck
Microlift Systems Inc.
Rosenthal Arnold
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