Patent ID: 8813776

Claim:
A valve apparatus comprising: a first valve seat; a second valve seat substantially co-aligned with the first valve seat; a first valve member moveable relative to the first valve seat between at least an open position in which the first valve member is spaced from the first valve seat and a closed position in which the first valve member is seated against the first valve seat; a second valve member substantially co-aligned with the first valve member, the second valve member moveable relative to the second valve seat between at least an open position in which the second valve member is spaced from the second valve seat and a closed position in which the second valve member is seated against the second valve seat; a coil; an armature operable for moving the first valve member and second valve member in response to a magnetic field generated by the coil; and a pressure sensor configured to provide an output voltage indicative of pressure at an outlet of the valve apparatus; the armature configured to move at least the second valve member relative to the second valve seat to vary an extent of an opening area therebetween to achieve multiple, different desired outlet pressures while the opening area is at least partially open.