Abstract: A low pressure gas regulator which includes a ball valve which is surrounded by a soft rubber seat which has two different thicknesses with one of the thicknesses being greater in the region which contacts the valve seat and being thinner on the portion of the ball valve which does not engage the valve seat. The ball valve is connected to a valve stem which is connected to a moveable diaphragm which the controls the position of the valve in response to pressure variations.

Abstract: A burner control system for gas fired apparatus of the powered blower vent type wherein a diaphagm valve for controlling the supply of gas to the main burner of the apparatus is operated by a gas bleed line which is subject to pressure regulation by a servo regulator valve. The bleed line is also subject to on-off control by pneumatically operated bleed valve means which are responsive to the subatmospheric fluid pressure produced in the exhaust vent of the apparatus by an exhaust blower to permit opening of the diaphragm valve only when the fluid pressure level within the exhaust vent is sufficiently below atmospheric pressure. The control system preferably includes switching circuit means which are effective to energize the exhaust blower only during the existence of a pilot burner flame adequate to ignite the main burner.

Abstract: A combination control for main and pilot burners of gas burner apparatus wherein a thermostatically controlled redundant simultaneously controls the supply of gas to pilot burner and main burner gas outlets. A pilot flow passage has a first branch passageway which supplies a restricted low pilot supply of gas independently of the redundant valve for producing a pilot burner flame of a small standby size when the redundant valve is closed. The pilot flow passage further includes a second branch passageway communicating with the redundant valve for supplying an increased high pilot supply of gas to produce a pilot flame of a larger ignition size when the redundant valve is open. A check valve in the second branch passageway blocks gas flow therethrough from the first branch passageway when the redundant valve is closed.

Abstract: A manual main shutoff valve for a gas burner combination control of the type having a casing which includes a housing plate in overlying relation to a partition plate. An axially movable valve member is spring biased to a closed position seated on a valve seat portion of the partition plate. A rotary valve actuator carried by the housing plate includes a cam member in engagement with the cam follower of an operating lever which is pivotally mounted in the casing and operatively connected to the valve member for moving the valve member to an open position in response to rotation of the valve actuator to an "ON" position.