| 摘要 |
<p>A thermally responsive mixing valve assembly (30) supplies tempered water to an emergency shower or eyewash system. The assembly includes a valve body (31) defining hot and cold inlets (32, 33), hot and cold chambers (45, 46), a mixing chamber (48) and an outlet (34). The valve body supports a plurality of thermostatic valves (50) all in fluid communication with the hot and cold liquid chambers (45, 46) and the mixing chamber (48). The valves include a thermostat (51) operable to stroke a shuttle valve (85) within a valve liner (70). The valve liner (70) includes a number of apertures (77) in communication with the cold liquid chamber (46) and a bore (76) in communication with the hot liquid chamber (45). The shuttle valve (85) modulates to restrict hot water flow, but the flow of cold water through the apertures (77) is unrestricted. The valve liner (70) also includes cold bypass slots (78) that are normally closed by the shuttle valve (85) but that are opened upon a failure of the thermostat (51). A backseat valve (95) is provided to terminate hot water flow on thermostat failure.</p> |
