Patent ID: 8800597

Claim:
A fine control gas valve, comprising: a tee having opposed first and second tee runs co-axially aligned on a longitudinal axis, and a tee branch oriented perpendicular to the longitudinal axis; a valve assembly partially received in and connected to the first tee run, the valve assembly having a valve disc connected to a drive screw and longitudinally moved by axial rotation of the drive screw; a pie-shaped first disc slot created in the valve disc having a first side wall edge and a second side wall edge, the second side wall edge oriented at an angle with respect to the first side wall edge and defining a reference line oriented parallel to and offset from a disc longitudinal axis, a width of the first disc slot continuously increasing to a wide width second end which defines a slot end arc; and a pipe received in the second tee run having a first portion of a pipe end face/seat surface in direct contact with a shoulder created in a wall of the second tee run and extending inwardly from the wall, the valve disc when contacting a second portion of the pipe end face/seat surface defining a valve closed condition, the first and second portions of the pipe end face/seat surface being co-planar to each other.