| 摘要 |
PURPOSE:To greatly reduce piston volume by forming a discharge valve with a through hole provided in a piston and a U-shaped notch of a diaphragm, so that the assembling process of the piston into the valve may be eliminated. CONSTITUTION:As a piston is forced in, and the volume of an airtight chamber is expanded, gas pressure is lowered to open a suction valve 8, allowing air intake inlet part gas to flow into the airtight chamber. Then, when the piston 3 moves downward, the suction valve 8 changes to a released state to permit it to be closed, and thereby the volume of the airtight chamber is redued, allowing the gas pressure to rise. And, a discharge valve 231 is inclined toward a valve due to the difference against the gas pressure at the discharge inlet part guide, allowing gas in the airtight chamber to flow out to a chamber formed by a bonnet 7 through a venting hole. |
