| 摘要 |
PROBLEM TO BE SOLVED: To provide a thermally-actuated steam trap capable of quickly discharging a large amount of low-pressure condensed water. SOLUTION: Covers 4, 5 are tightened to a body 3 having an inlet 1 and an outlet 2 to form a casing, and a valve chest 6 and a valve seat storage chamber 7 are formed between the body 3 and the cover 4 and between the body 3 and the cover 5, respectively. The valve chest 6 and the valve seat storage chamber 7 are communicate each other via an opening 10 having a large passage area. A valve seat 15 having a valve hole 13 communicating between the valve chest 6 and an outflow passage 12 is arranged in the valve seat storage chamber 7 so as to be movable forward and backward. An inlet chamber 16 communicating from the inlet 4 via a communication passage 9 is formed on the back of the valve seat 15, and a first thermally-actuated element 17 is arranged in the inlet chamber 16. The first thermally-actuated element 17 of a coil shape memorizing alloy is contracted during a low temperature to open the opening 10 with the valve seat 15 and elongated during a high temperature to close the opening 10 with the valve seat 15. A second thermally-actuated element 19 is arranged in the valve chest 6. The second thermally-actuated element 19 opens/closes the valve hole 13 during a high temperature when the valve seat 15 closes the opening 10.
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