Fluid-logic thyristor

Details Fluid-logic thyristor Fluid-logic thyristor

1980-10-30

1984-08-28

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

417 40, 417128, 417131, F15B 1304

Patent

active

044678312

ABSTRACT:
A hybrid gate-controlled three-way valving device that because of its regenerative-feedback-induced bistable action is a fluid-logic analogue of the electronic thyristor. The device is more particularly analogous to a common electronic thyristor known as the silicon controlled rectifier (SCR) because each is a switching device that in its normal state blocks forward conduction of the control-agent fluid, but which upon receipt at a control gate of an appropriate signal will trigger full forward conduction of the control-agent fluid. Each is moreover a device wherein such full forward conduction, once triggered by a brief signal, will continue even after the signal has been removed, until the control-agent supply flow has been cut off, reduced or reversed.
In an actual circuit, the fluid-logic thyristor functions typically as a three-way pneumatic valve which in its normal blocked state has zero forward conduction (cylinder is blocked to supply but open to exhaust), but which can be actuated and latched into full forward conduction (cylinder is open to supply, blocked to exhaust) by means of a single force pulse mechanically delivered to one of the two control gates. Such forward conduction will continue even after the force pulse is discontinued and can normally be stopped only if an opposite mechanical force pulse is delivered to one of the two control gates. (See accompanying glossary).

REFERENCES:
patent: 629577 (1899-07-01), Luhn
patent: 1056709 (1913-03-01), Pollacek et al.
patent: 1161999 (1915-11-01), Trumble
patent: 1296524 (1919-03-01), Jay
patent: 1756895 (1930-04-01), Wheeler
patent: 2192200 (1940-03-01), Page
patent: 3138113 (1964-06-01), Arutunoff
patent: 4025237 (1977-05-01), French

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