PURPOSE: To increase a flow rate of discharge drain by forming an ejector member on an outlet side of a valve port, opening the outlet side of the valve port to a suction chamber of the ejector member, and forming a connecting portion for connecting a discharge pipe of a high pressure drain trap to a nozzle.

CONSTITUTION: A nozzle member 12 is disposed within a valve seat member 11. The nozzle member 12 is connected with a discharge pipe 27 of a high pressure drain trap through a connecting member 13. On an outlet side of a valve port of the valve seat member 11, there are disposed a suction chamber 14 formed around an injection port of the nozzle member 12, throat portion 15, and a divergent diffuser portion 16. An ejector member is composed of the nozzle member 12, suction chamber 14, throat portion 15 and diffuser portion 16. Therefore, it is possible to increase a flow rate of discharged drain.