Pneumatic retard having stroke-accelerating valve

Details Pneumatic retard having stroke-accelerating valve Pneumatic retard having stroke-accelerating valve

1975-06-30

1977-12-13

Schwadron, Martin P.

Fluid handling

Line condition change responsive valves

Direct response valves

137846, F16k 1500

Patent

active

040623777

ABSTRACT:
A pneumatic retard, of the type used to achieve time-delayed actuation of water-flow alarms or other devices, has a pneumatic chamber from which air is slowly discharged under the pressure applied by a spring-driven plunger. The chamber has an air discharge valve, which also serves as an inlet valve. When the actuating plunger has been released and has traveled to a position at which much of the air has been exhausted, the discharge valve is opened, releasing the remaining air pressure. This releases the plunger to travel from that point onward with a rapid actuating stroke.

REFERENCES:
patent: 2594320 (1952-04-01), LeClair
patent: 2772116 (1956-11-01), Dobkin
patent: 3406909 (1968-10-01), Pfeiffer
patent: 3437246 (1969-04-01), Clapp

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