2-wire electrothermal head

Description

-Electro-thermal actuators can be installed on on-off valves, like piston zone valves, or on cut-out valves mounted on manifold outtakes. In general, they are controlled directly by a room thermostat that closes a contact, thus allowing the actuator to be fed. The system features an inner wax thermostat that, due to the effect of electric current, warms up and gets longer. This forces the piston to move within the actuator and to drive the valve spindle closed or open. The actuator is available in both NC (normally closed) and NO (normally open) versions: in the former it keeps the valve closed through a spring when it is powered off; in the latter an internal mechanism inverts the sense of working (valve open without power supply). Available in 230 V (TE 3040-TE 4040) or 24 V (TE 3041-TE 4041) versions.