在锅炉运行过程中,经常遇到止回阀起不到阻止逆流作用,导致炉内水位降低、水泵烧毁等故障发生。主要是目前锅炉上配套使用的止回阀普遍采用升降式止回阀和旋启式止回阀,这两种止回阀往往对新阀止回效果还可以,如使用时间稍长,里面就会生锈积垢,阀瓣开启不灵活;若逆向压力低,阀瓣就不能回位或关闭不严,起不到止回密封作用。 During the operation of the boiler, it is often encountered that the check valve can not stop the reverse flow, resulting in the reduction of water level in the furnace and the breakdown of the water pump. Mainly used in the boiler supporting the use of commonly used check valve lift check valve and swing check valve, the two check valves are often the new valve check back effect can be, such as the use of a longer time, which Rusty fouling, flap open inflexible; if the reverse pressure is low, the flap can not be returned or closed lax, can not stop the sealing effect.