Solenoid-actuated valve
AssigneesGraham-White Sales Corporation, Graham-White Manufacturing Company
InventorsVirgil L. Frantz, Thomas D. Taylor
Life of this patent
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Abstract
Solenoid-actuated valve adapted for heavy duty use by having the coil of the solenoid divided into high and low power windings connected in and automatically energized in succession by a solid state control circuit for providing in sequence high power of predetermined short duration for opening the valve and low power of usually longer duration for holding the valve in open position.
Claims6
A solenoid-actuated valve, comprising a valve member, a solenoid having a coil divided into a plurality of windings of different power, and a solid state control circuit connecting said windings in series to a direct current power source for automatically energizing in succession a high power of said windings to open said valve member and a low power of said windings to hold said valve member in open position, said control circuit, for predetermining a time delay between energizing of said high and low power windings of a duration to preclude overheating of said high power winding, including switching transistor means connected in parallel with said low power winding for initially shunting current therepast, initially off SCR means between said switching transistor means and ground, and a unijunction transistor for turning on said SCR means after said predetermined time delay and by discharging said switching transistor means to ground diverting current to and energizing said low power winding.
Dependencies are inferred from the claim text.