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。