YUKEN叠加式减压阀部分常规型号参考：MRA-06-A-70 , MRA-06-B-70 , MRA-06-C-70 , MRA-06-H-70 , MRB-06-A-70 , MRB-06-B-70 , MRB-06-C-70 , MRB-06-H-70 , MRP-06-A-70 , MRP-06-B-70 , MRP-06-C-70 , MRP-06-H-70