Digital regulators

Details Digital regulators Digital regulators

2006-10-10

2008-10-07

Fristoe, Jr., John K. (Department: 3753)

Valves and valve actuation

Electrically actuated valve

Solenoid having plural coils

C251S129160, C335S299000

Reexamination Certificate

active

07431262

ABSTRACT:
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 latching current pulse and retained in the latched condition by residual magnetism in a zero air gap magnetic circuit. Various embodiments are disclosed, including embodiments having the solenoid actuators side by side and in a stacked relationship, solenoid actuators having springs providing a spring force in a binary progression, solenoid actuators having equal springs and distributed in a binary progression from a hinge axis, and solenoid actuators not distributed in a binary progression from a hinge axis and not distributed in a binary progression from the hinge axis. Embodiments are also disclosed having the capability of interpolating between binary settings of the digital regulator.

REFERENCES:
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patent: 6496092 (2002-12-01), Schnatterer et al.
Hydraforce, EHPR98-T33 Proportional Reducing/Relieving Data Sheet, undated, pp. 2.971.1-2.971.2.
Eaton Vickers, Proportional Pressure Reducing Valves Technical Catalog, May 2003, pp. 1-14.

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