Regarding the installation of valve connecting surfaces, the Shandong sales office of Shanghai Lianggong Valve reminds everyone to choose threaded valves at the end of the device. The depth of the thread screwed into the valve should be suitable. If the thread is screwed too deep, it will compress the valve seat and affect the excellent fit between the valve seat and the gate. If the thread is screwed too shallow, it will affect the sealing reliability of the joint and simply introduce leakage. The thread sealing material should be PTFE raw tape or sealant, and be careful not to give the sealing material to the valve cavity.

关于法兰端部衔接的阀门，要找正法兰的衔接面，封面垂直于管线，且螺栓孔要对正。阀门法兰应与管道法兰平行，法兰空隙适中，不该呈现错口、歪斜等表象，法兰间心垫片应放置正中，不能偏斜，螺栓应对称均匀拧紧。避免在阀门装置时强行衔接拧紧，发生一个附加残余力。

For valves with flange end connections, the first step is to align the flange connection surface, with the cover perpendicular to the pipeline, and the bolt holes aligned. The valve flange should be parallel to the pipeline flange, with a moderate gap between the flanges and no appearance of misalignment or skewness. The gasket between the flanges should be placed in the center and should not be skewed. The bolts should be tightened symmetrically and evenly. Avoid forceful connection and tightening during valve installation, resulting in an additional residual force.

装置前要彻底铲除管子内壁及外部螺纹的污物;铲除有碍介质活动和能够影响设备工作的毛刺、异物等，在管子衔接前吹净管道中的污垢、渣及其他杂物。避免损害阀门的密封面或堵塞阀门。

Thoroughly remove dirt from the inner wall and external threads of the pipe before installation; Remove burrs, foreign objects, etc. that hinder medium activity and can affect equipment operation, and blow out dirt, slag, and other debris in the pipeline before connecting the pipes. Avoid damaging the sealing surface of the valve or blocking the valve.

装置焊接端部衔接阀门，应先组对点焊后阀门两头焊口，敞开阀门，然后按焊接工艺卡施焊焊缝，焊后对焊缝外观及内在焊缝质量进行查看，保证无气孔、夹渣、裂纹等，需求时应对焊缝进行射线或超控查看。

When welding the end of the device to connect the valve, it is necessary to first assemble and spot weld the two ends of the valve, open the valve, and then weld the weld according to the welding process card. After welding, the appearance and internal weld quality of the weld should be checked to ensure that there are no pores, slag inclusions, cracks, etc. When necessary, the weld should be inspected by X-ray or over control.

较重阀门的装置

Device for heavier valves

装置较重的阀门时(DN>100)，应用起吊东西或设备，起吊绳索应系在阀门的法兰或支架上，不该系在阀门的手柄式阀杆上，避免损坏阀门。

When installing heavy valves (DN>100), lifting objects or equipment should be used. The lifting rope should be tied to the flange or bracket of the valve, and should not be tied to the handle stem of the valve to avoid damage to the valve.