标准机械密封,符合:EN12756 (DIN 24960)ISO 3069JBT1492/GBT 6556典型类型: MG1,M7N,H7N,M74D,H74D,HJ92N 盒式密封:典型类型: MG1,M7N,H7N,M74D,H74D,HJ92N