| 摘要 |
PURPOSE:To make it possible to carry out unloading action steadily even in making a change in suction pressure by preventing suction pressure from acting directly as back pressure on a piston to open a suction valve. CONSTITUTION:A valve cover 21, 22 form a cylinder chamber 23 in which a piston 24 is provided. A rod 26 is formed in a body with the piston 24 at its back center, and passes airtightly through a cylinder cover 22 to freely slide with the piston 24. In addition, the tip of the rod 26 is connected with a lifter 31 through a compression spring 30, and a suction valve 12 is opened or closed by means of the lifter 31. Thus atmospheric pressure is introduced from a port 32 into the rear side of the piston 24, and operating air pressure for unloading is introduced from a port P to the piston 24. |
