Patent ID: 6234189
Filing Date: 2001-05-22
Classification: F23K,F23N,F23Q,Y10T

Abstract:
A gas-valve assembly comprising:a housing having an inlet port, an outlet port, and a passage extending between the ports and defining an axis;a valve plug rotatable about the axis in the housing in the passage between a closed end position blocking flow between the ports and an open end position permitting flow between the ports;a control knob rotatable on the housing and angularly coupled to the valve plug;means engaged between the knob and the housing for preventing the knob from moving axially relative to the housing while permitting rotation of the knob about the axis relative to the housing;a safety valve in the housing having a valve body displaceable axially between a closed position blocking flow through the passage and an open position permitting flow through the passage; andactuating means including a cam with a spiral cam surface and a cam follower riding on the cam surface and coupled to the knob for displacing the safety-valve body between its positions on rotation of the knob about the axis.