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只要它遇到至少20％的系统体积每分，回油管是主系统污染控制过滤器的一个很好的位置。在回油管流量小于20％最小值的场合（当泵处于补偿时的工作期），系统中应设计一个补充的循环泵和过滤器见图25。需要循环（或离线）过滤器的系统往往还需要离线冷却环路；这些需要可以用一
As long as it meets at least 20% of the system volume per minute, the return line is a good location for the main system pollution control filter. In the case where the return flow is less than 20% of the minimum (when the pump is in operation for compensation), a supplementary circulator and filter should be designed in the system. Systems that require round-robin (or offline) filters often also require off-line cooling loops; these needs can be done with one