G - Physics – 05 – D
Patent
G - Physics
05
D
137/24
G05D 7/03 (2006.01) F01K 3/26 (2006.01) F01K 7/38 (2006.01) G05D 9/00 (2006.01)
Patent
CA 1141257
48,779 ABSTRACT OF THE DISCLOSURE A method and system for allocating fluid flow draining from a fluid utilizing apparatus to first and second fluid sinks. The fluid flow is entirely routed to the first fluid sink for drain flow rates less than a predetermined flow rate and to the second fluid sink as well as the first fluid sink for drain flow rates at least as great as the predetermined flow rate. Fluid from the fluid utilizing device is received in a drain tank through an inlet port and is drained therefrom through an outlet port. The fluid flow rate through the outlet port is regulated by cooperatively modulating first and second valves arranged in parallel flow relation to allocate fluid flow to the first and second fluid sinks. The valves are modulated to provide a fluid flow rate through the drain tank's outlet port of substantially equal magni- tude to the fluid flow rate entering the inlet port. The inlet and outlet fluid flow rates are equalized by modu- lating the valves in response to signals which are indica- tive of the drain tank's fluid level. First and second parallel acting signal generators detect the fluid level in the drain tank and generate the fluid level indicator signals. The first signal generator's signal is normally transmitted to the first valve which modulates in response thereto to maintain the desired drain tank fluid level. The second signal generator normally provides a drain tank level indication signal to the second valve which modu- lates for signals indicative of drain tank fluid levels greater than a predetermined height. Signal monitors 16 48,779 provide means for detecting erroneous signals generated by the first and second signal generators. If an erroneous signal, as indicated by a signal being out of a predeter- mined range, from one signal generator is monitored, transmission of that signal to its respective valve is obstructed and the other signal generator's signal is transmitted to both valves. Since two identical signal generators are used to supply the signals to the valves, either signal generator can provide the signal while the other signal generator is isolated and replaced or re- paired during operation of the fluid utilizing apparatus.
367500
Daransky Thomas E.
Dickinson John D.
Mcconnell And Fox
Westinghouse Electric Corporation
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