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。

“ The development of flat metal sealing butterfly valve ”是由提供的国际阀门新闻，译文仅供参考。另外，中国蝶阀网还提供相关产品搜索：、、 、、等。

原文：
Many types of butterfly valve
1. Classified according to structure
(1) Center Seal Butterfly Valve
(2) single eccentric valve seal coal
(3) The double eccentric butterfly valve seal
(4) three eccentric valve seal stamp
2. According to the sealing surface material classification
(1) soft sealing butterfly valve.
1) Sealing materials from non-metallic soft non-metallic soft material composition.
2) Sealing materials from non-metallic rigid metal soft material composition.
(2) metal hard seal butterfly valve. Sealing materials from metal to metal hard hard material composition.
3. By sealing the form of classification
(1) Mandatory sealed butterfly valve
1) Flexible seal butterfly valve. Seal than the pressure valve is closed by a valve plate extrusion seat, valve seat or valve plate produces flexible
2) plus torque seal butterfly valve. Seal than the pressure applied on the valve shaft by the torque generated
(2) pressurized seal butterfly valve. Seal than the pressure from the valve seat or valve plate sealing component parts of the shells produced sufficient pressure
(3) self-sealing valve. Seal pressure than the pressure from the media generated automatically.
4. Classified according to working pressure
(1) vacuum valve. Working pressure lower than the standard heap of atmospheric calendar butterfly.
(2) low pressure valve. Nominal pressure PN <1.6MPa of the butterfly.
(3) medium-pressure valve. Nominal pressure PN is 2.5 - 6.4MPa of the butterfly.
(4) high-pressure disc valve. Nominal pressure PN of 10. 0 - 80.0MPa the butterfly.
(5) ultra-high pressure valve. Nominal pressure PN> 100MPa of the butterfly.
5. By Operating Temperature Classification
(1) high-temperature valve. t> 450 C of the butterfly valve
(2) temperature disc valve. 120 C (3) at room temperature valve. A 40C (4) low-temperature valve. 1 100 (E) ultra-low-temperature valve. t <1 100 C of the butterfly valve
6. Classified according to connection
(1) clip-on butterfly.
(2) flange type butterfly valve.
(3) supporting lug type butterfly valve.
(4) Welding-type butterfly valve.

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