Stuck pushbutton contingency operation for a steam turbine contr

Details Stuck pushbutton contingency operation for a steam turbine contr Stuck pushbutton contingency operation for a steam turbine contr

1984-01-20

1985-12-17

Ostrager, Allen M.

Power plants

Motive fluid energized by externally applied heat

Having apparatus cleaning, sealing, lubricating, purging,...

91429, F01K 1300

Patent

active

045585695

ABSTRACT:
A steam turbine control system which includes a manual panel with pushbuttons for operator control of the steam admission valves. Each valve has its own control means and is responsive to pushbutton activation to govern its valve movement. If a pushbutton indicating valve opening or closing gets stuck, the operator pushes a pushbutton indicating opposite movement and the control means switches to a special control mode after a predetermined period of time. In the special mode valve movement stops after removal of the operator's finger pressure and valve movement is accomplished by activation of predetermined pairs of pushbuttons.

REFERENCES:
patent: 4095119 (1978-06-01), Nangle et al.
patent: 4368520 (1983-01-01), Hwang et al.

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