| 摘要 |
<p>A safety shut-off device is disclosed which acts to shut-off the supply of hot water in a pipe when a predetermined temperature threshold is achieved. The device includes a valve seat (8) and a valve member (24) moveable into and out of contact with the valve seat (8). The valve member (24) is supported by a membrane (22) which closes the lower end of a cylindrical chamber (20). The chamber has an opening which is coupled to the flow upstream of the valve seat (8). The valve member (24) has a bore (24C) which extends from the chamber to a location downstream of guide legs (24B) which engage the valve seat to guide the valve member (24) into and out of engagement with the valve seat (8). A bimetallic disc (28) is supported by the legs (24B) on the underside of the valve member (24). When the temperature of the water flowing through the valve seat (8) exceeds a predetermined threshold, the bimetallic disc (28) snaps into a position to close the bore (24C). As a result pressure in the chamber (20) builds up to cause the valve member (24) to close against the valve seat (8).</p> |
