| 摘要 |
PROBLEM TO BE SOLVED: To deter self-excited vibration of a valve by increasing an axial direction movement damping force of the valve by a method wherein in an injection nozzle to be used for a deaerator or the like to be installed in a water supply system of a thermal power plant, a spring member giving a restoring force for opening and closing a valve, and a means for adding an axial direction movement damping force of the valve are provided. SOLUTION: When a fluid of boiler supply water or the like is supplied, a valve 2 moves in a direction of separating from a valve seat 1 against an energizing force of a spring 5 by being pushed by the fluid passing through a channel 1a of the valve seat 1, and a channel is opened. Besides, when a flow rate of the fluid is decreased, the valve 2 is restored by the restoring force of the spring 5 to be seated on the valve seat 1, and the channel is closed. Then, an O-ring 7 is arranged between the valve seat 1 and a valve rod 21, it is pressed from an upper stream side by an O-ring presser 8, and its upper stream side is supported by a spring receiver 3. Then, when the valve 2 moves axially, a damping force acting on the valve 2 is increased by sliding friction between the valve rod 21 and the O-ring 7. Thereby, self-excited vibration to he generated to the valve 2 is deterred.
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