Electrothermal actuator for zone valves and terminal units that can be coupled with Siemens valves series VGZ 2-way, XGZ 3-way and XGZ+TXZ 3-way 4-port.
It consists of a thermostatic expansion element (PTC) which, once it receives the 230 Vac command, causes a small piston to come out and pushes the valve stem downwards, all the while overcoming the contrast spring of the valve body itself.
The actuator is made with double thermal insulation, plastic closing cover and manual control knob for operation without power supply.
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