The Eclipse Inc. 200 LockTite valves are manually opening valves that automatically shut off the gas supply to a combustion system when any interlocking limit switch opens. The valve handle cannot be reset until the condition causing the open switch is corrected and all limit switches are closed. 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.