| 摘要 |
A smooth vent valve in which an on-off valve and a flow control valve are provided in series and arranged to be capable of being operated by respective actuating mechanisms, thereby accurately performing the on-off operation of the on-off valve and the flow rate control of the flow control valve. The smooth vent valve (11) has an on-off valve (8) and a flow control valve (9), which are coaxially provided between an inlet port (18) and outlet port (19) of a valve body (13 to 15). The on-off valve (8) and the flow control valve (9) are placed in series. An actuating mechanism for the on-off valve (8) and an actuating mechanism for the flow control valve (9) are formed separately from each other. When the on-off valve is in an open position, the flow control valve can be switched between a throttling position and an open position while continuously changing the flow rate.
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