1.范围1。1本标准实施规程规定了带法兰、螺纹、机械接头和推入式端部连接的球墨铸铁闸阀的要求。1.2这些阀门适用于本文规定的通用用途的尺寸和压力温度额定值。1.3本标准实施规程还直接或通过引用包括对常用材料的化学和物理性能以及端部连接尺寸的规定。1.4本标准操作规程涵盖了具有冷工作压力（CWP）和指定等级的球墨铸铁闸阀。

1. SCOPE1.1 This Standard Practice provides requirements for ductile iron gate valves with flanged, threaded, mechanical joint, and push-on end connections.1.2 These valves are suitable within the sizes and pressure temperature ratings specified herein for general purpose service.1.3 This Standard Practice also includes, directly or by reference, stipulations for chemical and physical properties of materials and dimensions of end connections in common use.1.4 This Standard Practice covers ductile iron gate valves with Cold Working Pressure (CWP) and Class designated ratings.