密封管座 meaning in English

tight socket

Straight pattern valves with flange socket placed in shunt - part 1 : without lining
分流器法兰密封管座的直排型阀门.第1部分:无衬
Straight pattern valves with flange socket in main power connection - part 1 : without lining
主电源连接的法兰密封管座直排型阀门.第1部分:无衬
Straight pattern valves with flange socket in main power connection - part 2 : with plastic lining
主电源连接的法兰密封管座直排型阀门.第2部分:带塑料