如果手动蝶阀无法打开或空转，可能是以下几个原因：

　　If the manual butterfly valve cannot be opened or runs idle, there may be several reasons:

　　一、阀杆受到堵塞或损坏：

　　1、 The valve stem is blocked or damaged:

　　检查阀杆是否正常工作，如果发现阀杆无法转动或移动，则可能是因为其受到堵塞或损坏。使用润滑剂尝试移动阀杆，如果不行，需要更换阀杆或寻找其他方法解决问题。

　　Check if the valve stem is working properly. If it is found that the valve stem cannot rotate or move, it may be due to blockage or damage. Try moving the valve stem with lubricant. If it doesn't work, replace the valve stem or find other ways to solve the problem.

　　二、手柄松动或损坏：

　　2、 Loose or damaged handle:

　　检查手柄是否正确安装，如果手柄松动或损坏，可能会导致阀门无法打开。尝试重新安装手柄或更换损坏的手柄以解决问题。

　　Check if the handle is installed correctly. If the handle is loose or damaged, it may cause the valve to fail to open. Try reinstalling the handle or replacing the damaged handle to solve the problem.

　　三、蝶板销钉损坏：

　　3、 Butterfly plate pin damage:

　　检查蝶板销钉是否正确安装，如果蝶板销钉损坏或松动，则会导致阀门无法打开。尝试重新安装或更换损坏的蝶板销钉来解决问题。

　　Check if the butterfly plate pin is installed correctly. If the butterfly plate pin is damaged or loose, it will cause the valve to fail to open. Try reinstalling or replacing the damaged butterfly plate pin to solve the problem.

　　如果以上方法都不能解决问题，可能需要请专业人士检查并维修阀门。注意在维修阀门时，必须遵循安全规范，避免发生事故。本文由 上海良工阀济南销售处   友情奉献.更多有关的知识请点击  http://www.jnlgvf.com/   真诚的态度.为您提供为全面的服务.更多有关的知识我们将会陆续向大家奉献.敬请期待.

　　If none of the above methods can solve the problem, it may be necessary to have a professional inspect and repair the valve. Attention must be paid to following safety regulations when repairing valves to avoid accidents. This article is a friendly contribution from the Jinan sales office of Shanghai Lianggong Valve For more related knowledge, please click http://www.jnlgvf.com/ Sincere attitude To provide you with comprehensive services We will gradually contribute more relevant knowledge to everyone Coming soon.