Patent ID: 8881762

Claim:
An air shutoff valve system, comprising: a housing that defines an airflow passage; a shutoff valve disposed in the airflow passage, the shutoff valve moveable between an open position configured to permit airflow through the passage and a closed position configured to substantially stop airflow through the passage; an indicator operatively coupled to the shutoff valve, the indicator being movable between a normal state and a tripped state in respective correspondence with the open and closed positions of the shutoff valve, the indicator including a body having a disruptive portion, the disruptive portion extending radially outward from the body; and a rotatable lever including a lever body having a first edge, the first edge protruding from the lever body and engaged with the disruptive portion of the indicator when the indicator is in the normal state; a spring attached to the lever below the first edge, the spring compressed when the indicator is in the tripped state; at least one solid-state proximity sensor disposed in the airflow passage and configured to detect when the indicator is in the tripped state.