Abstract: A thermostatic mixing valve (TMV) for operation across a range of flow rates wherein during low pressure operation water enters the TVM (100) into chamber (157) around the circumference of the valve member (150) and cold valve seat (140) and hot water enters into chamber (158), the hot and cold water entering chamber (235) and becoming thoroughly mixed. At low pressure drops, the check valves (230) remain closed so the only pathway the mixed water can follow is through the sensing chamber (125) and the mixed water enters discharge portion (120) to the mixed water outlet (245), the flow path of the hot and cold water shown by pathways (255) and (260), the water becomes thoroughly mixed before entering the sensing chamber (225).

Abstract: A thermostatic mixing valve comprises a casing including inlet ducting for passage of relatively hot and cold fluids e.g. water, to a valve means which control the outflow of mixed fluids from the valve via outlet ducting. An elongate thermostat is located in the ducting and regulates the position of the valve means. The thermostat includes a first shorter portion which is responsive predominantly to the cold fluid and a second longer portion responsive to the mixed fluid, the arrangement being such that when there is a fall in cold fluid pressure the effect of the first (relatively inactive) portion reduces so that the second (active) portion now functions to reduce the hot fluid input and thereby avoid or reduce an undesirable rise in temperature of the discharge mixed fluid which otherwise would occur.

Abstract: A fluid supply system for supplying a fluid draw-off such as for example domestic showers includes a fluid blending valve discharging blended liquid into a recirculation pipeline delivering to the draw-off and returning to a cold inlet of the blending valve, liquid recirculation occurring when the draw-off is closed, and a pump is preferably provided to ensure satisfactory recirculation. At least a portion of the recycled liquid is fed to a heat exchanger. To ensure that the temperature of the recycled liquid is maintained at a desired value, which is particularly desirable in the case of a shower installation where excess temperature can be physically dangerous, an additional thermostatic control valve is provided responsive to the recycled liquid temperature and operatively associated with the heat exchanger to maintain the recycled liquid temperature.