Central heating and hot water circulation in wet domestic central heating systems. Available in 2 port, 3 port diverter and 3 port mid position versions. H series ‘shoe’ valves are available in 2 port and 2 port versions in a wide range of sizes for both copper and iron pipework. Actuators for mid position, diverter and 2 port on/off applications complete the range. Valve bodies and actuators may be purchased separately or in convenient sets. For ease of installation and service ability, assembly of the actuator to the valve body is made on site, using the screws provided. The high capacity bodies incorporate two self cleaning positive shut off shoes. Flow through the 2 port valves can be in either direction. The spring return actuators have auxiliary switches and one metre of cable with industry standard wire colours. A lever enables the valves to be opened manually, useful when filling the system. Danfoss valve actuators are designed for direct in-service replacement of actuators on other makes of motorised valves.