| 摘要 |
PROBLEM TO BE SOLVED: To provide a thermally-actuated steam trap capable of quickly discharging a large mount of low pressure condensate. SOLUTION: In a main body 3 having an inlet 1 and an outlet 2, a valve chamber 6 and a valve seat storing chamber 7 are communicated through an opening 10 and an orifice 11 having a large passing area. In the valve seat storing chamber 7, a valve hole 13 communicating the valve chamber 6 and an outflow passage 12 is provided, and a valve seat 15 provided with a throttle member 14 is arranged so as to move backward and forward. A first thermally- actuating element 17 is made of a coil-shaped shape-memory alloy, and shrinks at low temperature period to open the opening by a valve seat 5 and increase the passing area of the orifice 11 by the throttle member 14 of the valve seat 5. The first termally-actuating element 17 closes the opening 10 by the valve seat 15 and throttles the passing area of the orifice 11 by the throttle member 14 of the valve seat 15 under high temperature. A second thermally-actuating element 19 opens/closes the valve hole 13 to discharge condensate under high temperature, at high temperature period when the valve seat 15 closes the opening 10 and throttles the passing area of the orifice 11.
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