316或317不銹鋼閘板具有很好的耐腐蝕性能.Gates are available, 316 or 317 steel for corrosion resistance.閘板防噴器是石油鉆井過程中的一種重要設(shè)備.Ram - type blowout preventer is important equipment used in oil drilling operation.手動(dòng)或執(zhí)行機(jī)構(gòu)推動(dòng)搖桿使扇形閘板沿軸心旋轉(zhuǎn)開啟,物料隨即下落...