Also known as gas dedicated valve, the concealed gate knife gate valve with cover is mainly applied to gas, sewage and other gas/liquid pipelines, effectively preventing leakage from the upper bonnet.

暗板带盖刀型闸阀又称为燃气专用阀，主要应用于燃气以及排污等气体或液体管道。有利于防止上封盖泄漏。

It features easy installation, cost savings and superior wear resistance, widely used in transmission pipelines for powder, slurry, gas and liquid media.

主要特点是安装方便，节约成本，耐磨耐损，一般应用于粉料、浆液、气体、液体等介质传输管道。

Its upper sealing structure breaks traditional sealing designs by adopting a top cover assembly, which converts the large-area rectangular upper seal into a small-area circumferential seal, greatly boosting sealing performance. On the basis of the circumferential seal, it integrates internationally advanced floating sealing structure, enabling the upper seal to match the service life of the pipeline and extend the overall service life of the valve.

此种刀 型闸的上密封突破了常规的密封形式 ，采用上盖结构 ，使得上密封由大面积的矩形密封改成了小面积的圆周密 封，密封性能大大提高。在圆周密封的基础上，又采用了目前国际上先进的浮动密封结构，使得上密封达到了与 管道同寿命的程度，从而整体上提高了阀门的使用寿命。

When a sealing sleeve is fitted on top of the handwheel, all moving components of the valve are fully enclosed. The screw drive between the gate plate and valve stem will not seize up due to dried lubricating oil. This valve is especially suitable for long-term stable operation under harsh dusty and dry working environments.

此种闸阀在手轮顶部加装封套装置后，可以使阀门活动 部件全部处于封闭状态，闸板和阀杆的丝杆传动不会因润滑油干枯而卡涩。特别适合在粉尘及干燥的恶劣环境中 长期正常工作。