| 摘要 |
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.
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