초록 ▼

Various embodiments of air control valves are disclosed. Each has a mechanism, controlled by a solenoid and by the difference between fluid pressure at its inlet and fluid pressure at its outlet, for allowing communication between an air pump and an exhaust gas treatment system as long as fluid pres

Various embodiments of air control valves are disclosed. Each has a mechanism, controlled by a solenoid and by the difference between fluid pressure at its inlet and fluid pressure at its outlet, for allowing communication between an air pump and an exhaust gas treatment system as long as fluid pressure at the outlet does not exceed fluid pressure at the inlet by more than a predetermined difference during absence of a predetermined electric energization of the solenoid, for disallowing communication between the air pump and the gas treatment system during presence of the predetermined electric energization of the solenoid, and for disallowing communication between the air pump and the gas treatment system whenever fluid pressure at the outlet exceeds fluid pressure at the inlet by more than the predetermined difference.

대표청구항 ▼

1. An electric operated control valve for controlling fluid communication between an air pump and a gas treatment system that treats exhaust gas produced by an internal combustion engine, the valve comprising:a body having an inlet for communicating the valve to the air pump and an outlet for commun

1. An electric operated control valve for controlling fluid communication between an air pump and a gas treatment system that treats exhaust gas produced by an internal combustion engine, the valve comprising:a body having an inlet for communicating the valve to the air pump and an outlet for communicating the valve to the gas treatment system; an electric operator; a reed that is disposed between the inlet and the outlet and that, during absence of a predetermined electric energization of the operator, opens to allow communication between the air pump and the gas treatment system but is forced closed in response to fluid pressure at the outlet exceeding fluid pressure at the inlet by more than a predetermined amount to disallow communication between the air pump and the gas treatment system, and that during presence of the predetermined electric energization of the operator, is forced closed to disallow communication between the air pump and the gas treatment system.