Patent ID: 7905557

Claim:
A pneumatic valve control device, comprising: a 3/2 solenoid valve having two inputs and one output, said output being in pneumatic communication with a first valve-modulator device for a first pressure-regulating loop and with a second valve-modulator device for a second pressure-regulating loop, each of said first and second valve-modulator devices including a first normally open 2/2 solenoid air-admission valve and a second normally closed 2/2 solenoid vent valve, said first 2/2 solenoid valve including a primary armature and said second 2/2 solenoid valve including a secondary armature, said primary and secondary armatures being (i) spring-loaded, (ii) disposed in a common armature-guide arrangement and (iii) actuatable by a common solenoid, at least said secondary armature including an elastomeric insert, both said primary armature and said secondary armature being in their respective normal positions defined by spring loading when said common solenoid is de-energized, said primary armature being displaceable into switched position based on magnetic force and said secondary armature remaining in spring-loaded normal condition when a first magnet current flows through said common solenoid, both said primary armature and said secondary armature being displaceable into switched position based on said magnetic force when a second magnet current of greater magnitude than said first magnet current flows through said common solenoid, and said primary armature and said secondary armature being disposed in a common magnetic flux loop in which magnetic flux is generated by magnet current flowing through said common solenoid and in which said magnetic flux in said secondary armature is reduced compared with said magnetic flux in said primary armature.