A test and pressure relief valve should be installed to assure relief of internal pressure prior to servicing and as a visual indication of trap operation.

应该安装一个测试和压力安全阀，确保内部压力能够在维修前得到释放，并作为疏水阀工作的直观显示。

The flat bottom gate provides full perimeter seating against the seat, eliminating pocket in the bottom of the seat that can trap process media and prevent the valve from fully closing.

平坦的闸板底部与阀座之间能够实现全周长阀座密封，避免阀座出现可能淤积流体介质、妨碍阀门完全关闭的底部洞隙。

A check valve should be installed on return piping if there will be a pressurized return line or the trap drains to an overhead return line (Fig. B).

如果存在一个压力回路，或者疏水阀排放口位于回路管道的上方，则应该安装一个止回阀(图b)。

Pneumoceles may occur suddenly, presumably by a trap-valve mechanism or by rupture of a large mucocele.

窦膨出可见突然发生，大概是一种滤网机制或者是一个大的黏液囊肿破裂所致。

Keep return piping valve closed until trap fills with condensate. Slowly open valve.

保持回路管道阀门处于关闭状态直到疏水阀充满冷凝物为止。慢慢开启阀门。