| 摘要 |
A thermostatic mixing valve 10 including a valve body 11 having a first fluid 12 inlet, a second fluid inlet 13 and a mixed fluid outlet 14, a mixing chamber 16 located between the respective fluid inlets 12,13 and the fluid outlet 14. A thermostatic element 15 is located for exposure to mixed fluid and a piston 17 is arranged for movement within the valve body in response to expansion or contraction of the thermostatic element 15. The piston 17 throttles flow of fluid through the first fluid inlet 12 into the mixing chamber 16 by varying its position relative to a first seat 33, and through the second fluid inlet 13 into the mixing chamber 16 by varying its position relative to a second seat formed as a bore 35 into which the piston 17 can progressively enter. Progression of the piston 17 into the bore 35 initially results in a substantial throttling of the flow of fluid from the second fluid inlet 13 into the mixing chamber 16, while further progression results in engagement between the piston 17 and the second seat 35 to terminate the flow of fluid from the second fluid inlet 13 into the mixing chamber 16.
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