Watts Electrothermal Actuator - 580T

Watts Electrothermal Actuator - 580T

Two-position electrothermal actuator for zone valves Series 561T, 560T, 571T. Normally open (NO) auxiliary microswitch for additional commands (e.g. pump, metering). Sealable anti-tamper device.

Bayonet coupling on the valve body. External manual opening command. Positioning time: 4-5 min. Power consumption: 20W (230V), 18W (24V).

Operation

The zone valves, electrically connected to a room thermostat, operate in two positions (on / off). The

slow and silent movement of the valve obturator, which in rest conditions is normally closed, is entrusted to a

sensitive wax element contained in the 580T Series actuator. In the automatic operating condition the valve, at

closes the contact of the room thermostat, it opens as the thermostatic element due to the heat generated by the

electrical resistance that surrounds it, expands and exerts a thrust on the valve stem. A safety microswitch

interrupts the electric power supply to the resistance when the stem has reached the end position (valve completely

open), but continues to supply voltage at regular intervals until the contact of the room thermostat opens. A spring of

contrast restores the starting position of the stem (valve closed), when the resistance is no longer powered. A clean contact

switching auxiliary closes before the microswitch intervenes and allows the circulation pump to start

accounting system or other equipment. In manual operation (Fig. 1), to be used only with the valve closed,

the control lever external to the actuator allows the valve to be opened without excluding the auxiliary contact, ensuring this

the correct functioning of the system, especially in the case of heat metering