The V4043 series of two port Motorised Valves has a wide range of flow control applications in domestic and light commercial central heating systems. The V4043H normally closed models have end switches for electrical control of pump and/or boiler. The V4043B normally open model is particularly applicable to control of solid fuel systems, since it will always fail-safe in the event of a power failure. Features Motor open Spring return action Manual lever for filling draining the system Powerhead replaceable without draining down Potential free end switch for electrical control of pump and/or boiler Quiet operation, minimal power consumption Options Normally open normally closed versions available 22mm/28mm or 1/2", 3/4", 1" BSP connections Replacement motor/powerhead/ball and 'O' ring kit.
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