Exhaust gas recirculation valve having low drag

摘要

A pintle-type valve including a valve body enclosing a chamber having a first port surrounded by an annular valve seat in a first wall of the chamber and a second port in a second and opposite wall of the chamber for receiving a pintle bushing. A valve pintle shaft having an attached valve head is disposed in the bushing. The second port is larger in diameter than the diameter of the valve head, so that the valve head may be admitted to the chamber through the port. The bushing is radially floating in the port and has a flange extending along an outer surface of the valve body for forming a seal therewith. The pintle extends into a conventional solenoid-type actuator bolted to the valve body. A radially-floating gas seal surrounds the pintle between the retainer and the actuator. A compressed coil spring holds the bushing in place against operating pressure within the valve chamber. The bushing and gas seal are centered by the valve stem, reducing frictional drag and reducing valve leakage.