The new Eclipse actuators system, from Halogen Valve Systems, closes toxic gas valves on 150lbs and ton cylinders in less than one second when activated by remote sensors. This actuator system will then provide a closed contact to signal that the valve is closed and sealed. The operator can then visit the site to correct the condition, check the gas connections, and manually reopen the valve to start the gas system. The Eclipse is a battery-operated actuator that allows an operator or remote gas sensor to shutoff leaking toxic gas without requiring the operator to enter the hazardous atmosphere. The chlorine valve can be opened or closed manually with the actuator installed and ready to operate. The actuators are installed on standard ton or cylinder hardware and can be tested by the operator each time to assure correct operation.