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原文
The non-directional installation manual butterfly valve Valve itself does not need installation directions, mainly supporting the expansion joints meet the water needs to be installed in the direction. No installation direction, manual butterfly valve can be installed in any position in the pipeline, with a vertical transmission of the butterfly valve should be installed so that vertical transmission mechanism to maintain state. (1) the overall control valve installation should consider the following aspects: ① Security: installation personnel and equipment safety. ② control performance: piping system pressure loss and calculation of valve size should be taken into account when the same pressure loss to ensure the required flow characteristics. Import and export should ensure adequate straight pipe. ③ installation location: should have sufficient space to facilitate the operator manual (including bypass operation) and to ensure the control valve and accessories of the possibility of in situ removal and maintenance. ④ regulating valve: general process piping are installed in the bypass valve shut-off valve and control valve dubbed valve to meet the equipment needs of continuous operation. When valve repair with a shut-off valve isolation. The bypass valve adjustment. The following figure recommended regulating valve layout. (2) Field Installation Installation personnel should first recognize the control valve is a precision instrument and equipment, are not allowed to crash or fall, to avoid damage. Specifically note the following: ① valve is preferably installed in the vertical stand pipe. Valves larger weight and vibration applications supporting frame should be added. ② body before and after the piping to avoid or reconcile different shaft flange seriously been too much stress. ③ In the first pre-construction and downtime after the flush piping system should be installed after the valve. Or transition filter installed before the valve port. ④ must be in accordance with the flow direction of the arrow on the valve control valve installation. ⑤ valve should be installed in an ambient temperature of -20 ℃ ~ 60 ℃, relative humidity ≤ 95%, without serious corrosive gas environment.
原文来自：http://www.diefa.org

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译文：
蝶阀本身安装并不需要方向，主要是配套的伸缩器需要安装在迎水方向。　　　　无安装方向，手动蝶阀可安装在管道的任何位置上，带传动机构的蝶阀应直立安装，使传动机构保持铅垂状态。　　　　(1)安装调节阀总体上应考虑以下方面：　　①安全：安装过程中人员和设备的安全。　　②控制性能：配管系统压力损失应与计算调节阀尺寸时所考虑的压力损失一致，以保证所需的流量特性。进出口应尽量保证足够的直管段。　　③安装位置：应有足够的空间便于操作人员手动操作(包括旁路操作)以及保证调节阀和附件的就地拆卸和维修的可能性。　　④调节阀组：一般在工艺过程配管中均安装切断阀的旁路阀与调节阀配成阀组，以适应设备连续操作的需要。维修调节阀时用切断阀隔离。用旁路阀调节。下面图中推荐调节阀组布置方式。　　(2)实地安装　　安装人员首先应认识到调节阀是一种精密的仪器设备，不准碰撞跌摔，以免损坏。具体注意以下几点：　　①阀最好正立垂直安装在管道上。阀自重较大和有震动场合应加支承架。　　②阀体要避免因前后配管或调和的法兰严重不同轴而受到过大的应力。　　③在初次开工前和停工检修后应先冲洗配管系统后装调节阀。或在阀前安装过渡滤口。　　④必按照阀体上流动方向的箭头安装调节阀。　　⑤阀应安装在环境温度为-20℃~60℃，相对湿度≤95%，无严重腐蚀性气体的环境中。

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