The gate valve can only be fully opened and closed, and cannot be adjusted and throttled. The gate valve has two raised faces. The common method is to produce wedge and wedge angle on the two convex faces of the gate valve. Generally, gate valves are prone to water seepage and corrosion. The soft sealing gate valve (elastic seat sealing gate valve) is made of cast iron lined with rubber, which solves the disadvantages of ordinary gate valves such as poor sealing, elastic fatigue and easy corrosion.

软密封闸阀是一般闸阀的更新产品。采用弹性材料闸阀，利用弹性材料产生的少量变形补偿效果，可达到良好的密封效果。软密封闸阀具有开关轻密封可靠弹性记忆好使用寿命长等显着优点。硬密封闸阀的闸阀为铸铁或不锈钢，开闭阻力小，不阻流，但密封性能差。软密封闸阀的区别在于闸阀的突出方式不同。

The soft seal gate valve is a new product of the general gate valve. The gate valve made of elastic material can achieve good sealing effect by using a small amount of deformation compensation effect produced by elastic material. The soft seal gate valve has the advantages of light switch, reliable sealing, elastic memory, long service life, etc. The gate valve of hard seal gate valve is cast iron or stainless steel, with small opening and closing resistance and no flow resistance, but poor sealing performance. The difference of the soft seal gate valve is that the gate valve protrudes in different ways.

闸阀型号应注明标准编号的要求。

The model of gate valve shall indicate the requirements of national standard number.

闸阀工作压力，要求≥在不改变的情况下，闸阀的工作压力应大于管道的实际工作压力，闸阀关闭条件下的任何一侧应承受1.1倍的工作压力而不泄漏；在闸阀打开的前提下，阀体应承受闸阀工作压力的两倍要求。

The working pressure of the gate valve shall be ≥ The working pressure of the gate valve shall be greater than the actual working pressure of the pipeline without changing the price, and any side of the gate valve shall bear 1.1 times of the working pressure without leakage when it is closed; On the premise that the gate valve is open, the valve body shall withstand twice the working pressure of the gate valve.

软密封闸阀的标质

Standard substance of soft seal gate valve

阀座材料，力求不锈钢阀杆(2CR13)，大直径阀门也应为不锈钢嵌套阀座。

The valve seat material shall be stainless steel stem (2CR13), and the large diameter valve shall also be stainless steel nested valve seat.

阀座轴套材料的硬度和强度不应大于阀座，在水浸泡的前提下与阀座和阀体不发生电化学反应。

The hardness and strength of the valve seat sleeve material shall not be greater than that of the valve seat, and there shall be no electrochemical reaction with the valve seat and valve body under the condition of water immersion.

突面材料

Raised face material

①闸阀种类不同，密封方式和材料要求不同；

① Different types of gate valves require different sealing methods and materials;

②一般楔形闸阀铜环材料固定方法研磨方法应说明；

② Fixing method of copper ring material of general wedge gate valve and grinding method shall be described;

阀轴填料

Valve shaft packing

②阀填料还应承受频繁启闭时密封效果的*性；

② The valve packing shall also bear the tightness of the sealing effect during frequent opening and closing;

④如需更换填料，气动阀的设计应注意在水压下更换的措施。

④ If it is necessary to replace the packing, the design of the pneumatic valve should pay attention to the measures of replacement under water pressure.