译文：
对夹式止回阀安装的注意事项： 　　对夹式止回阀：是一种通用单向流体阀门。其重量轻，体积小，容易安装在法兰之间，阀门内部由两个半圆弹簧和板面组成，用销子固定在阀体上弹簧形变使阀板关闭，流体压力又使其开启弹簧的形变很快，这样能保护管道免受水锤破坏。 　 安装注意事项： 　　1、放置管道时应注意使对夹式止回阀的通过方向与流体流向一致； 　　2、安装在垂直放置的管路中。对于水平放置的管路，垂直放置对夹式止回阀； 　　3、在对夹式止回阀和蝶阀之间使用一个伸缩管，千万不要将其与其它阀门直接相连； 　　4、在阀板操作半径范围内，避免加入管接头和阻塞物； 　　5、不要在对夹式止回阀的前面或者后面安装一个变径管； 　　6、在弯头附近安装对夹式止回阀时，要注意留有足够大的空间； 　　7、在水泵出口安装对夹式止回阀时，至少流出六倍阀门直径的空间以保证蝶板最终受到流体作用。

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原文：
Wafer Check Valve is installed Note: Wafer Check Valve: It is a universal one-way flow valve. Its light weight, small size, easy to install between flanges, valve springs and within two semicircular board composition, with a spring pin fixed to the body deformation of the valve plate closed, fluid pressure exerted by the spring to open deformation quickly, this can protect the pipes from water hammer damage. Installation Notes: 1, place the pipe should pay attention to wafer type check valve in the direction of fluid flow through the line; 2, installed in the vertical placement of the pipe. For the horizontal pipe, vertical placement of the clip-type check valve; 3, wafer type check valve and butterfly valve between the use of a telescopic tube, do not be directly connected with other valves; 4, the valve plate operating radius, to avoid the added fittings, and obstructions; 5, do not type check valve in the folder in front of or behind the installation of a tapered tube; 6, near the elbow check valve installed on the folder, you should pay attention to leave enough space; 7, the pump exit check valve installed on the folder, at least out of six times the diameter of the valve disc space to ensure that the final effect by the fluid.