MVA actuators are used in V.ZB globe valve coupling for cool/warm water control in two- and four-pipe terminal units and zone systems.

MVA actuators are electro-thermal type and are controlled by an on-off signal or, for MVA41/42 only, by pulse width modulation too.

Actuators are supplied by control signal; this causes the thermostatic element to heat up and a small piston to come out and lower the valve stem.

MVA22-42 actuators are supplied with a 2 (0.2)A 250 V SPST microswitch with contact closed by powered actuator; a particular application of fan control terminal unit being: the fan, connected to microswitch contact on the actuator, operates by open valve and stops when valve is near to full close position. This in order to avoid cool air throw.

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