JIS B8323:1985 pdfダウンロード。Water Ring Vacuum Pumps Scope This Japanese Industrial Standard specifies the water ring vacuumpumps(‘), hereinafter referred to as the “pumps”, for general uses of 20 to150 mm in suction opening bore which are directly connected by flexibleshaft joint with 50 Hz or 60 Hz three phase induction motor on a commonbed and are connected by y belt.Further, the gas to be handled by the pump shall, as a rule, be airat -10.C to 50C. Note (1) These pumps includes those of short time rating and thoseof continuous rating. The short time rating and continuousrating herein are in accordance...