Refrigeration – Automatic control – Refrigeration producer
Patent
1984-08-08
1987-03-24
Tanner, Harry B.
Refrigeration
Automatic control
Refrigeration producer
62126, 62129, 62210, 62211, 62223, 25112905, F25B 4900, F25B 4104
Patent
active
046515356
ABSTRACT:
A pulsed controlled solenoid flow control valve suitable for use in a closed vapor cycle air conditioning system is disclosed. A pulsewidth modulated control signal is generated for cyclically opening and closing the flow through the expansion valve. The duty cycle of the pulsed control signal determines the average flow rate through the valve. An exponential response control curve is used in conjunction with an integrator offset to obtain a single set point control operating point for all flow rates through the valve, where a given change in the second superheat of the evaporator produces the same percentage change in flow rate regardless of the flow rate.
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Staefa Control System, Inc., Modulating Magnetic Valves Valcor Engineering Corp., Solenoid Valve Sections SCS-Magnetic, Brochure re Modulating Control Valves.
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