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TESTING THE GAS CONTROL VALVES
The top burner gas valves control the gas flow to the top burners. The valve is a barrel and core,
grease sealed, locking type valve (see Figure 6-12). Before the stem can be turned, it must be
pushed in to unlock the valve. Gas flows from the manifold pipe into the rear of the valve and enters
into the hollow core. The core has one large and two small holes in its side. When the stem of the
valve is rotated, the core rotates with it. As the core is rotated, gas is allowed to flow from the large
hole into the mixer elbow.
When the core is rotated 90-degrees, the large hole in the core matches the hole in the barrel
allowing the maximum amount of gas to flow. When the core is rotated past 90˚, the gas flow is
reduced.
To test a gas control valve:
1. Gas leak at the valve.
a) Check to see if either the knob or the valve stem is rubbing the control panel. If so, align
the manifold pipe before replacing the valve. If the alignment is good, replace the valve.
Note: Any type of side pressure on the valve stem will cause the valve to leak.
2. The valve stem is hard to turn, or cannot be turned.
a) Check to see if the control panel is preventing the stem from being pushed in. If so, adjust
the manifold pipe. If not, replace the valve.
Barrel
Spring
Stem
Valve Body
Push To Turn
Manifold Pipe
Figure 6-12