安装指南
Installation Guide

1. 本蝶阀为双向蝶阀，可以安装在任一个方向上。
   This Butterfly Valve is bi-directional and may be installed in either direction.
2. 安装在ANSI标准125或150磅级法兰之间。也可采用铸铁，青铜，塑料或钢法兰。不需要法兰垫圈。
   Install this valve between any ANSI Class 125 or 150 flange. Cast iron, bronze, plastic or steel flanges may be used. No flange gaskets are required.
3. 阀杆可以安装在任意位置，但是如果可以选择阀杆安装方向，最好使得阀杆朝向水平方向。这样能够均匀的分配阀杆和阀瓣的重量，最大限度减少衬垫磨损。
   The stem can be installed in any position, but if a choice of stem positions exists, good practice dictates that the valve be installed with the stem horizontal. This will minimize liner wear by distributing stem and disc weight evenly.
4. 安装阀门时，阀瓣应该处于关闭或几乎关闭的位置。这样可以防止阀瓣密封边缘的损坏。
   Valves should be installed with the disc in the closed or almost closed position. This will prevent damage to the disc sealing edge.
5. 在紧固阀门螺栓之前，阀门应该处于法兰之间的中心位置，然后小心打开，以确保阀瓣能够灵活、无障碍的运动。如果安装在管道上的阀门通径小于管道直径，例如管道厚度较大、塑料管道或铸铁法兰，都可能导致阀瓣运动受到影响。必须采取适当的矫正措施来消除这些障碍物，例如对管道镗圆锥形孔或安装间隔垫片。
   Before any flange bolts are tightened, valves should be centered within the flanges and then carefully opened to assure free, unobstructed disc movement. Disc interference may result when valves are installed in pipelines having smaller than normal inside diameters, such as heavy wall pipe, plastic lined pipe, or as cast flanges. Suitable corrective measures must be taken to remove these obstructions, such as taper boring the pipe or installing a spacer.
6. 在检验操作能够正常进行后，在采用交叉法紧固所有螺栓。推荐的紧固扭矩模式如下所示。
   After proper operation has been verified, tighten all bolts using the crossover method. Recommended tightening torques pattern is listed below.

7. 当蝶阀直接通过螺栓连接到旋启式止回阀、静音止回阀或缩径法兰的外法兰上时，也可能发生阀瓣受到影响的情况。止回阀和蝶阀组装是很常见的，通常需要在阀门之间增加一段短管。
   Interference may also occur when butterfly valves are bolted directly to the outlet flange of a swing check, silent check, or reducing flange. Check valve and butterfly valve combinations are very popular; normally a short spool piece is required between the valves.

警告
Caution

1. 250磅级铸铁和300磅级钢法兰不能用在这些阀门上。
   Class 250 cast iron and Class 300 steel flanges can not be used on these valves.
2. 不建议采用橡胶面或机械式法兰。
   Rubber faced or mechanical flanges are not recommended.
3. 这些阀门不推荐用于蒸汽应用领域。
   This valve is not recommended for steam service.
4. 不能用法兰组装阀门，然后将其焊接到管道系统中。
   Valves should not be assembled to the flanges and then welded into the piping system.
5. 杠杆-锁定手柄不推荐用于DN200以上的阀门。
   Lever-lock handles are not recommended for use on 8" and larger valves.
6. 在压缩空气管道中不要安装EPDM衬垫的阀门。
   Do not install EPDM liner in compressed air lines.