Manually opening valves
Automatically shut off the gas supply to a combustion system when any interlocking limit switch opens
Typical limit switches include air pressure, gas pressure, temperature limit and flame monitoring contacts
In the event of a power failure, the valve immediately closes
Series 200 LT valves include two visual indicators of "open" or "closed" position: a red "flag" visible in the plastic dome on top of the valve; and the reset handle position as indicated by cast markings on the operator case
These valves also include two SPDT micro-switches that can be used for auxiliary circuits
Two contacts are made when the valve opens and two are made when the valve is closed