Abstract: An averaging temperature responsive device having a hollow elongated member, a plurality of holes substantially along the length of the member, the plurality of holes decreasing in area from the hole near the end at which the member is mounted to the hole at the other end of the member, an exhaust opening at the second end of the member for permitting air moving through the duct which enters the plurality of holes to be exhausted from the inside of the member, and a temperature responsive element for sensing the average temperature of air moving through the member.

Abstract: A modulating plug valve is disclosed having a valve seat for providing communication between the inlet and outlet openings of the valve, a stem extending through the valve housing, a disc mounted on the valve stem for allowing angular movement of the disc with respect to the stem for seating against the valve seat to cut off communication between the inlet and outlet openings and a plug mounted on the valve stem for lateral and angular motion with respect to the stem for modulating the fluid flow between the inlet and outlet openings when the disc is not seated against the valve seat.