Valve sequencing startup control system for once-through boiler

Details Valve sequencing startup control system for once-through boiler Valve sequencing startup control system for once-through boiler

1976-04-20

1977-04-26

Sprague, Kenneth W.

Liquid heaters and vaporizers

Circulation

With start-up operations

60646, 60667, F22B 2912

Patent

active

040194671

ABSTRACT:
A once-through boiler is provided with integral separators and a plurality of valves for controlling fluid flow during boiler startup. A pressure control generates an open or close signal for all of the valves and a sequence selector responds to the pressure control and a valve-in-operation logic circuit to generate valve selection signals which enable the valves to respond sequentially to the pressure control output.

REFERENCES:
patent: 3262431 (1966-07-01), Hanzalek
patent: 3286466 (1966-11-01), Stevens
patent: 3366093 (1968-01-01), Stevens et al.
patent: 3789806 (1954-02-01), Gorzegno
patent: 3954087 (1976-05-01), Stevens et al.

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