| 摘要 |
PURPOSE:To keep a piston sliding surface from being damaged by drain by disposing means for discharging outside drain generated by condensation of operating air in an operating air chamber of a piston for opening and shutting a suction throttle valve. CONSTITUTION:When the internal pressure of an oil separator 15 rises, and an escape valve 18 disposed in an operating air pipeline 19 is opened, operating air flows through the operating air pipeline 19 into an operating air chamber of a suction throttle valve 1. The operating air is cooled in the operating air pipeline 19, and it has much drain content generated by condensation. The drain is sucked up together with the operating air through an inflow port 24 from the air chamber 11 to a discharge path 23, and then discharged to the air through an outlet 25, an orifice 27, a conduit 26, an air emitting pipeline 21 and an inlet 4 of the suction throttle valve 1. |
