气动三偏心硬密封蝶阀是在二偏心硬密封蝶阀基础上生成一 个角度(密封面为斜锥面)，从而形成三偏心硬密封蝶阀。该结构 在启闭过程中无机械磨损和擦伤，其关闭力矩小、切断性能好、 使用寿命长，同时具有调节和切断两种功能。 本系列产品广泛应用于石油、化工、电力、冶金、环保、轻 纺、造纸等工业部门的自动化控制系统中。适用于液体、气体、 煤气、天然气、蒸汽等介质进行截止或调节流量控制。 

The pneumatic tri-eccentric hard seal butterfly valve is based on the two-eccentric hard seal butterfly valve to generate an angle(the sealing surface is an inclined cone) ， thus forming the tri-eccentric hard seal butterfly valve.The structure has no mechanical wear and scratch in the process of opening and closing， small closing torque， good cutting performance and long service life， as well as has two functions of adjustment and cutting. This series of products are widely used in the automatic control system of petroleum， chemical industry， electric power， metallurgy， environmental protection， light textile， papermaking and other industrial sectors. In addition， it's suitable for liquid， gas， coal gas， natural gas and steam to cut of for regulate flowcontrol.