Gas Control Valves
Manual Gas Control Valve System Components
The manual control valve system is an assembly consisting
of a manual control knob assembly and internal and external parts of
the safety pilot system.
Manual Valve: Gas Control Knob Assembly
The control knob (also referred to as the gas cock) assembly
includes:
- a round plastic knob, marked with three positions (PILOT, ON, and
OFF), that rotates and can be pushed in
- a solid shaft moved and rotated by the knob
- a rod connected to the center of the shaft (inside the valve) that
presses against and unseats the shutoff disc of the EPU (electromagnetic
power unit) when the knob is pushed in
- a cylinder connected to the shaft, and which surrounds the rod, that
has an opening that allows and directs gas flow when rotated and aligned
with portals that lead to the pilot and main burners.
The control knob assembly is the manual adjustment mechanism that allows
gas flow to the pilot hood, holds the valve open until the safety pilot
system is energized, and then can be positioned to allow gas flow to the
main burner. It is also the means for turning the appliance off in normal
shutdown.
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