manual butterfly valve
常見例句
- It does not need large-diameter bottom cover to discharge dry cake, generally only with ball valve or butterfly valve. The valves can be electric or pneumatic, or manual.
底部不需大直逕的排乾濾餅底蓋，衹用球閥或蝶閥，這些閥門可以是電動(dòng)，或者氣動(dòng)，或者手動(dòng)。 返回 manual butterfly valve