| 摘要 |
A pressure control device with a fluid discharge prevention mechanism such that operation is reliable, size is small, weight is light, and cost is low. The pressure control device according to the present invention comprises a novel valve body housing a weight and a fluid discharge prevention valve together, a vessel body with a tank-communicating port, and a lid with an atmosphere-communicating port. The top circumferential surface of the valve body serves also as a vacuum pressure regulation valve in cooperation with the vessel body.
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