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.

關于法蘭端部銜接的閥門，首先要找正法蘭的銜接面，封面垂直于管線，且螺栓孔要對正。閥門法蘭應與管道法蘭平行，法蘭空隙適中，不該呈現錯口、歪斜等表象，法蘭間心墊片應放置正中，不能偏斜，螺栓應對稱均勻擰緊。避免在閥門裝置時強行銜接擰緊，發生一個附加殘余力。

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.

裝置前要徹底鏟除管子內壁及外部螺紋的污物;鏟除有礙介質活動和能夠影響設備工作的毛刺、異物等，在管子銜接前吹凈管道中的污垢、渣及其他雜物。避免損害閥門的密封面或堵塞閥門。

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.

裝置焊接端部銜接閥門，應先組對點焊后閥門兩頭焊口，敞開閥門，然后按焊接工藝卡施焊焊縫，焊后對焊縫外觀及內在焊縫質量進行查看，保證無氣孔、夾渣、裂紋等，需求時應對焊縫進行射線或超控查看。

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.

較重閥門的裝置

Device for heavier valves

裝置較重的閥門時(DN>100)，應用起吊東西或設備，起吊繩索應系在閥門的法蘭或支架上，不該系在閥門的手柄式閥桿上，避免損壞閥門。

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.