The top flange of an extension stem, plug shaft diameter, and distance across flats on plug shaft are the same size as the valve selected.
订购时，请指明阀门尺寸、规格型号，以及从阀门法兰到延长件法兰顶部的准确距离（用户指定的长度如右图所示）。
When ordering, specify valve size, figure number, and the exact distance from the valve flange to the top of extension flange (customer-specified length shown at right).
订购时，请指明阀门尺寸、规格型号，以及从阀门法兰到延长件法兰顶部的准确距离(用户指定的长度如右图所示)。
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