- double beat (or seat) valve
- doublebeatorseatvalve
- 双座: two-seater; double-seater
- 阀: established house or power g ...
- 双层: double-deck; having two laye ...
- 双座阀: double beat drop valve; double beat valve; double seat (or beat) valve; double seat ale; double seat valve; double seated valve; double-beat drop valve; double-beat dropvalve; double-beat valve; double-beatdropvalve; double-beatvalve; double-seat valve; doubleseatorbeatvalve; doubleseatvalve
- 一双向座的双座阀: twin-seat one seat un-directional and one seats
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