蝶阀的种类及其特点

译文：
蝶阀的种类很多 　　1．按结构形式分类 　　(1)中心密封蝶阀 　　(2)单偏心密封煤阀 　　(3)双偏心密封蝶阀 　　(4)三偏心密封跺阀 　　2．按密封面材质分类 　　(1)软密封蝶阀。 　　1)密封副由非金属软质材料对非金属软质材料构成。 　　2)密封副由金属硬质材料对非金属软质材料构成。 　　(2)金属硬密封蝶阀。密封副由金属硬质材料对金属硬质材料构成。 　　3．按密封形式分类 　　(1)强制密封蝶阀 　　1)弹性密封蝶阀。密封比压由阀门关闭时阀板挤压阀座，阀座或阀板的弹性产生 　　2)外加转矩密封蝶阀。密封比压由外加于阀门轴上的转矩产生 　　(2)充压密封蝶阀。密封比压由阀座或阀板上的弹件密封元件充压产生 　　(3)自动密封蝶阀。密封比压由介质压力自动产生。 　　4．按工作压力分类 　　(1)真空蝶阀。工作压力低于标堆大气历的蝶阀。 　　(2)低压蝶阀。公称压力PN＜1．6MPa的蝶阀。 　　(3)中压蝶阀。公称压力PN为2．5--6．4MPa的蝶阀。 　　(4)高压碟阀。公称压力PN为10。0--80．0MPa的蝶阀。 　　(5)超高压蝶阀。公称压力PN＞100MPa的蝶阀。 　　5．按工作温度分类 　　(1)高温蝶阀。t＞450 C的蝶阀 　　(2)中温碟阀。120 C＜t＜450 C的蝶阀 　　(3)常温蝶阀。一40C＜t<120 C的蝶阀 　　(4)低温蝶阀。一100＜t＜一40 C的蝶阀 　　(E)超低温蝶阀。t＜一100 C的蝶阀 　　6．按连接方式分类 　　(1)对夹式蝶阀。 　　(2)法兰式蝶阀。 　　(3)支耳式蝶阀。 　　(4)焊接式蝶阀。

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原文：
Butterfly There are many kinds 1. By structure classification (1) Centre for Butterfly Valve (2) single eccentric seal coal valve (3) Double Eccentric Butterfly Valve (4) three eccentric seal Duo Valve 2. By sealing surface material classification (1) soft seal Butt-clamped electric rubber-lined butterfly valvebutterfly valve. 1) Sealing by the non-metal soft material on the non-metal soft material. 2) Sealing of metal hard material on the non-metal soft material. (2) metal seal butterfly valve. Sealing of metal hard material on the metal hard material. 3. By sealing the form of classification (1) mandatory sealing butterfly valve 1) Flexible seal butterfly valve. Seal than the pressure of the valve is shut off valve plate extrusion valve seat, valve seat or valve plate of flexible production 2) plus the torque seal butterfly valve. Seal than the pressure from the external to the valve axis of the torque generated (2) pressurized sealStretch type turbine driven flange butterfly valvebutterfly valve. Seal than the pressure from the valve seat or valve plate of elastic pieces of sealing pressurized produce (3) self-sealing valve. Seal than the pressure from the media pressure generated automatically. 4. By work pressure classification (1) vacuum valve. Working pressure lower than the standard heap atmosphere calendar Butterfly. (2) low pressure valve. Nominal pressure PN <1.6MPa butterfly. (3), the pressure valve. Nominal pressure PN is 2.5 - 6.4MPa butterfly. (4) high pressure disc valve. Nominal pressure PN is 10. 0 - 80.0MPa butterfly. (5) high pressure valve. Nominal pressure PN> 100MPa butterfly. 5. By Operating Temperature Classification (1) high temperature valve. t> 450 C of the butterfly (2) temperature disc valve. 120 C BUTTERFLY VALVES temperature valve. t <1 100 C of the butterfly 6. By connection classification (1) of the wafer type butterfly valve. (2) Flanged butterfly valve. (3) supporting ear butterfly. (4) Welding Butterfly.