热的凝结水通过疏水阀孔时压力降低,使部分凝结水发生二次汽化,体积骤增.为了使这种两相混合物顺利排出,疏水阀后的管线直径必须适当.若阀后管径太小,管道内二次蒸汽的流速过高,可能会产生水锤现象和较高的背压,使疏水阀排水不畅甚至完全失灵. The hot condensate water through the trap hole pressure is reduced, so that part of the condensation of water secondary vaporization, the volume surge.To make this two-phase mixture discharged smoothly, after the trap diameter of the pipeline must be appropriate.If the valve diameter after too Small, secondary steam flow in the pipeline is too high, may result in water hammer phenomenon and high back pressure, poor drainage trap or even completely failure.