The “Return-Line”cooling method is commonly used in China & Taiwan while the “Separate” cooling method is commonly used in USA & EUROPE. That is because, in China & Taiwan, hydraulic companies are using the assembling methods of “Water-Oil Cooler’ for “Air-Oil Cooler” application. you can find the disadvantages of using “Return-Line” cooling method in the following:
1). The absence of a “by-pass” or an incorrect cooling “by-pass” installation, may cause the cooler to burst.
2). Check Valve spring damage, caused by “Return-Line” flow action.
3). Inconsistency of heated oil from “Return-Line” flow will cause a negative effect on the hydraulic system.
4). Further to these factor, production stoppages fro repair purposes
“Separate” cooling method does not relate direct to the hydraulic system therefore will not have a negative effect despite the above disadvantages factors, because it is a separate unit entity by itself. Also the cooler unit failure will not effect the hydraulic operating system.
