| 摘要 |
PURPOSE:To reduce the pressure drop and to facilitate the flow rate control by separating a valve spindle from a spout hole with the fluid pressure, separating a low-pressure chamber provided independently of the fluid pressure with a fluid passage and a freely expandable bellows, and fixing the bellows to one end of the valve spindle. CONSTITUTION:A bellows 200 to whose pressure receiving surface one end of a valve spindle 250 is fixed is provided between a low-pressure chamber 300, having an air vent 310 communicating with the external air, and an intermediate chamber 220 on which fluctuant fluid pressure acts in an injection nozzle of fluid wherein a spout hole 150 is opened by sensing the fluid pressure. Then the valve spindle 250 is separated from the spout hole 150 by the expansion force of the bellows 200 due to the pressure difference between the intermediate chamber 220 and the low-pressure chamber 300 and the force in the reverse direction of a spring 140 pressing the valve spindle 250, and the spout hole 150 is opened. Accordingly, the spout hole is opened and closed only by the fluid pressure, the flow rate is easily controlled, and an injection nozzle with reduced pressure drop to the spout hole is obtained.
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