YUKEN叠加式减压阀部分常规型号参考：MRA-04-A-10 , MRA-04-B-10 , MRA-04-C-10 , MRA-04-H-10 , MRB-04-A-10 , MRB-04-B-10 , MRB-04-C-10 , MRB-04-H-10 , MRP-04-A-10 , MRP-04-B-10 , MRP-04-C-10 , MRP-04-H-10