![]() This ensures that the air is easily exhausted even though the pressure is low. When the air pressure in the high pressure chamber is decreased by exhaustion of the gas in this manner, deformation of the leak valve 1 is also decreased, thereby expanding the clearance between the recess 2a at the end of the ventilation-adjusting shaft 2 and the projection 1c of the leak valve 1. Accordingly, the high pressure air is passed through a hole 1b provided for exhausting air in the center of the leak valve 1, a narrow clearance between the recess 2a at the end of the ventilation-adjusting shaft 2 and the projection 1c of the leak valve 1, a leak space between the small-diameter part 11a of the ventilation-adjusting shaft 2 and the ventilation-adjusting shaft housing hole 11, and is exhausted from the exhaust gas hole 12 of the base 10.
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