In order to open a valve member during the breakage of a temperature control element and to prevent the counterflow of fluid from an outlet side to an inlet side even when pressure at the outlet side becomes higher than that at the inlet side,WATER POWER CONTROL VALVE there is provided a thermally-actuated steam trap comprising: a valve casing having an inlet, a valve chest and an outlet, Water Pump Control Valvesa valve seat member having a discharge passage between the valve chest and the outlet, a temperature control element disposed in the valve chest and including a cover member, Instrumentation Ball Valves a first diaphragm, a second diaphragm and a valve member and containing expansible medium, and a through hole formed respectively on the second diaphragm and the valve member attached thereto, through which a face of the first diaphragm being not in contact with the expansible medium communicates with the discharge passage.

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