Piston-driven valves

Details Piston-driven valves Piston-driven valves

1985-01-09

1986-04-15

Cohan, Alan

Fluid handling

Convertible

Unit orientable in a single location between plural positions

92 59, 251 63, 251 635, F16K 31122

Patent

active

045820821

ABSTRACT:
A piston-driven valve includes a valve body provided with inlet and outlet openings, the communication between which may be interrupted by a clack-valve which is integral with a rod connected to a piston which is subjected to a valve-control pressure. A reversible head is equipped with an intake port for the control pressure, and the piston is located in the reversible head. A first reset spring named low pressure spring, directly bears on the piston, and a second reset spring is located between two calibrating bridges and selectively acts on the piston structure is provided for removing action by the second spring on the piston, in order to allow the valve to work with a low control pressure value.

REFERENCES:
patent: 2421325 (1947-05-01), Griswold
patent: 2625954 (1953-01-01), Klein
patent: 2697599 (1954-12-01), Vandal

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