These valve actuators, with an 11 sq. in. (71 cm2) effective diaphragm area, are used with TAC VB-7xxx series valves for proportional pneumatic control of hot water or chilled water valves. The MK-46xx and MK4-46xx Series may also be mounted on discontinued 1/2" through 1-1/4" TAC VB-111, VB-131, VB-314, and VB-9xxx series valves.
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-29.png "Barber Colman (Schneider Electric) MK-4611, Pneumatic Actuator 11 sq. in. 5-10 Spring")