Since stop - check valves have a floating disc member , it is important the valve be sized to provide full disc lift under flow conditions prevailing during the major portion of the service life 由于截止止回阀具有一个浮动阀瓣构件，因此重要的是要确定在平常的流体环境下及阀门的使用寿命期限内，能够为阀瓣提供足够提升力的通径。
Automatic steam stop - check angle - globe valves are best on medium - pressure steam service where the sliding action of the semi - plug disc assembly permits the valve to serve as a shut - off valve , a throttling valve and a check valve 自动蒸汽截止止回阀和角式截止阀适用于中压蒸汽管道系统，此时半插入式阀瓣的滑动作用使得阀门能够起到关闭阀、节流阀和止回阀的作用。
In the nibco design stop - checks , you will note that the disc is mounted to permit the disc to settle into the seat area for positive sealing in case there is any misalignment due to assembly or uneven heat expansion 从美国尼伯科的截止止回阀结构设计中，人们可能会注意到，万一出现由于组装问题或不稳定的热膨胀导致的中心线错位，所安装的阀瓣能够适应阀座区域的要求主动调整密封。
Size specification of the stop - check used on the boiler system is usually done by the architect or engineer , but it should be possible for the nibco salesman to assist the wholesaler or contractor in selecting the right valve if there is some doubt 锅炉系统所采用的截止止回阀的通径选择通常由建筑师或工程师决定，但是如果批发商或建筑承包商在选择正确的阀门时有疑问，美国尼伯科销售人员可能可以提供一些帮助。
In the event that a boiler does shut down the stop - check must prevent backflow into the boiler , the weight of the disc and dash pot piston , through the force of gravity , promote rapid sealing so steam and condensate cannot backflow into the boiler even at low pressures 如果锅炉没有关闭截止止回阀，则必须防止回流到锅炉上，阀瓣压铁和缓冲活塞，在重力的作用下，能够迅速实现密封，使得蒸汽和冷凝水即使在低压下也不会回流到锅炉里。
