In the American standard gate valve, there are single gate, double gate and elastic gate. The single gate wedge gate valve is simple in structure and reliable in use, but it requires high precision for the angle of the sealing surface, and is difficult to process and maintain. The possibility of wedging when the temperature changes is very high. Double gate wedge gate valves are used more frequently in water and steam medium pipelines. For applications where the temperature exceeds 260 ° C, Xianwo Technology recommends the use of flexible or split wedge gates as internal gate valves to prevent the wedge gates from being stuck due to thermal expansion. When used in high-speed fluid (turbulent flow) or thermal cycle applications, to avoid loosening, the threaded seat ring should be welded to the valve body.

The American standard cast steel gate valve is suitable for various pipelines of DN15 ～ DN1650 and Class150 ～ Class2500, used to cut off or connect the medium in the pipeline. The American standard cast steel gate valve is the same as the Japanese standard cast steel gate valve, and generally uses flexible graphite forming filler. According to user requirements, PTFE filler, flexible graphite forming filler with various metal wires or composite filler can also be used. The surface area of ​​the stuffing box in contact with the packing has a good finish Ra 3.2μm. The contact part of the valve stem and the packing is finished with a roller extrusion treatment to achieve a higher finish (Ra 0.8μm) and density, which can ensure Reliable sealing at the valve stem.