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Page 4-2
The
Thermostat
is a hydraulic valve that has two separate gas lines and a sensing bulb (see
Figure 4-2 ). The
pilot
gas line maintains a pilot flame in the oven, and the
main
gas line provides
gas to the oven safety valve. The
sensing bulb
is a mercury-filled tube that controls the thermostat
to open or close the gas lines, and release gas from the manifold pipe to the oven safety valve. The
thermostat operates based on the temperature it senses in the oven cavity.
OFF
N
A
T
L
P
Oven
Thermostat
Main Gas Line
Pilot Gas Line
Sensing Bulb &
Capillary Tube
Manifold
Gas In
Figure 4-2
Orifice Hood
Heater Sensing
Bulb & Capillary Tube
Gas Inlet
(From Thermostat)
Cold Sensor
Valve Closed
No Gas Flow
Safety Valve
The
Oven Safety Valve
is also a hydraulic valve that has a gas inlet line and a gas port that is
metered by an orifice hood (see Figure 4-3). It also has a mercury-filled sensing bulb that controls
its operation. The safety valve has one function: to release gas to the oven burner from the
thermostat.
Figure 4-3