复合密封 meaning in Chinese

compound seal

Composite gasket for refrigeration - air - conditioning equipment
冷冻空调设备用复合密封垫片
Standard test method for creep relaxation of laminated composite gasket materials
复合密封材料的蠕变松弛试验方法
Maintenance simplified by easily replaceable piston seal and steel reinforced renewable rubber disc
更换活塞密封环和钢胶复合密封板简单方便。