译文：

蝶阀的蝶板安装于管道的直径方向。在蝶阀阀体圆柱形通道内，圆盘形蝶板绕着轴线旋转，旋转角度为0°-90°之间，旋转到90°时，阀门则牌全开状态。 蝶阀结构简单、体积小、重量轻，只由少数几个零件组成。而且只需旋转90°即可快速启闭，操作简单，同时该阀门具有良好的流体控制特性。蝶阀处于xx开启位置时，蝶板厚度是介质流经阀体时{wy}的阻力，因此通过该阀门所产生的压力降很小，故具有较好的流量控制特性。蝶阀有弹密封和金属的密封两种密封型式。弹性密封阀门，密封圈可以镶嵌在阀体上或附在蝶板周边。 采用金属密封的阀门一般比弹性密封的阀门寿命长，但很难做到xx密封。金属密封能适应较高的工作温度，弹性密封则具有受温度限制的缺陷。 如果要求蝶阀作为流量控制使用，主要的是正确选择阀门的尺寸和类型。蝶阀的结构原理尤其适合制作大口径阀门。蝶阀不仅在石油、煤气、化工、水处理等一般工业上得到广泛应用，而且还应用于热电站的冷却水系统。 常用的蝶阀有对夹式蝶阀和法兰式蝶阀两种。对夹式蝶阀是用双头螺栓将阀门连接在两管道法兰之间，法兰式蝶阀是阀门上带有法兰，用螺栓将阀门上两端法兰连接在管道法兰上。

“Selection of valve guide ”是由中国蝶阀网提供的国际蝶阀新闻，译文仅供参考。另外，中国蝶阀网还提供相关产品搜索：蝶阀型号、蝶阀价格、蝶阀技术、蝶阀新闻、蝶阀生产商等。

原文：

Butterfly valve butterfly plate installed in the direction of the pipe diameter. Cylindrical channel in the valve body, the disc-shaped butterfly plate around the axis of rotation, Cl 150 Lb Rubber Seated Butterfly Valvesrotation angle of 0 ° -90 ° between the rotation to 90 ° when the valve is fully open state license. Butterfly simple structure, small size, light weight, only by a small number of parts. And just rotate 90 ° to quickly open and close, easy to operate, while the flow control valve has a good feature. Butterfly in the fully open position, the butterfly plate thickness is only when the medium flows through the valve body resistance through the valve so the pressure drop generated by small, it has good flow control characteristics. There are shells and metal sealing butterfly Wafer Rubber Seated Butterfly Valvesvalve seal two kinds of sealed type. Elastic sealing valves, seals can be mounted on the body or attached to the butterfly board peripheral. Metal sealed valves generally higher than those elastic sealing valve long life, but it is difficult to achieve completely sealed. Metal seal can adapt to a higher operating temperature, flexible seal is affected by temperature limit has flaws. If you require the use of flow control valve as the main choice is the right size and type of valve. Butterfly structure principle is particularly suitable for production of Wafer Double Offset Butterfly Valveslarge-diameter valves. Butterfly not only in oil, gas, chemicals, water treatment, etc. are widely used in general industry, but also applied to thermal power plant cooling water systems. Commonly used in butterfly valves are wafer type butterfly valve and flange type butterfly valve two kinds. Right clip-on butterfly is double-headed bolts to connect the valve between the two pipe flanges, flange type butterfly valve is a valve with a flange on, with bolts at both ends of the valve on the pipe flange connection method Lan on.

原文来源:http://www.diefa.org/