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.

軟密封閘閥是一般閘閥的更新產品。采用彈性材料閘閥，利用彈性材料產生的少量變形補償效果，可達到良好的密封效果。軟密封閘閥具有開關輕密封可靠彈性記憶好使用壽命長等顯著優點。硬密封閘閥的閘閥為鑄鐵或不銹鋼，開閉阻力小，不阻流，但密封性能差。軟密封閘閥的區別在于閘閥的突出方式不同。

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.

閘閥型號應注明國家標準編號的要求。

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

閘閥工作壓力，要求≥在不改變價格的情況下，閘閥的工作壓力應大于管道的實際工作壓力，閘閥關閉條件下的任何一側應承受1.1倍的工作壓力而不泄漏；在閘閥打開的前提下，閥體應承受閘閥工作壓力的兩倍要求。

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.

軟密封閘閥的標質

Standard substance of soft seal gate valve

閥座材料，力求不銹鋼閥桿(2CR13)，大直徑閥門也應為不銹鋼嵌套閥座。

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

閥座軸套材料的硬度和強度不應大于閥座，在水浸泡的前提下與閥座和閥體不發生電化學反應。

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閘閥種類不同，密封方式和材料要求不同；

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

②一般楔形閘閥銅環材料固定方法研磨方法應說明；

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

閥軸填料

Valve shaft packing

②閥填料還應承受頻繁啟閉時密封效果的*性；

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

④如需更換填料，氣動閥的設計應注意在水壓下更換的措施。

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.