| 摘要 |
PROBLEM TO BE SOLVED: To provide a valve gear capable of reducing a pressure loss which is accompanied by the discharge of gas to the utmost.SOLUTION: The inside of a valve case 2 is partitioned into a float chamber 9 and a ventilation chamber 10 with a bulkhead 8; a communication port 11 for making the float chamber 9 and the ventilation chamber 10 communicate with each other is formed in the bulkhead 8; a peripheral edge of the communication port 11 is used as a valve seat; and a valve body 21 is provided in such a manner as to be capable of seating itself on and separating from the peripheral edge of the communication port 11. When the valve body 21 gets away from the peripheral edge of the communication port 11 and abuts on an inclined abutting surface of the valve case 2, a seating surface of the valve body 21 is inclined with respect to the peripheral edge of the communication port 11. Thereby, in the discharge of gas, a folding fan-shaped gas discharge passage is formed of the valve body 21 and the bulkhead 8 to restrain the gas from the float chamber 9 from being squeezed in the ventilation chamber 10. |
