Digital regulators using a plurality of latching solenoid actuators, each having a spring return, the springs being configured to provide a force on the valve member of a regulator, when the solenoid actuators are unlatched, in a binary progression. The solenoid actuators are selectively latched by an...http://www.google.fr/patents/US7431262?utm_source=gb-gplus-shareBrevet US7431262 - Digital regulators
