Digital positioner for remote actuation of a control valve

Details Digital positioner for remote actuation of a control valve Digital positioner for remote actuation of a control valve

1975-09-17

1978-02-07

Cohen, Irwin C.

Motors: expansible chamber type

With motive fluid valve

Pilot valve

91459, 92 131, 92 134, 92 136, 13762564, 13762566, F15B 1108, F15B 13043

Patent

active

040720870

ABSTRACT:
A digital positioner for remote actuation of a control valve includes a double-acting actuating piston connected to the control valve and a plurality of fluid-responsive stop means disposed to either side of the actuating piston. A plurality of remotely controlled pilot valves are operatively connected to respectively control the actuating piston and selected ones of the stop means. The system is especially adapted for remotely controlling hydraulic systems having a control valve for modulated control of the system for different speeds of the system.

REFERENCES:
patent: 356538 (1887-01-01), Hubner
patent: 2157240 (1939-05-01), Keel
patent: 2577462 (1951-12-01), Hackney
patent: 2596471 (1952-05-01), Densmore et al.
patent: 2922397 (1960-01-01), Haanes
patent: 3168854 (1965-02-01), Neilson
patent: 3187637 (1965-06-01), Edmund
patent: 3198212 (1965-08-01), Junck et al.
patent: 3213886 (1965-10-01), Pearne
patent: 3220318 (1965-11-01), McGuire
patent: 3736958 (1973-06-01), Rostad
patent: 3800671 (1974-04-01), Coleman et al.

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