Acceptance criteria for breathing valves

The rotor of screw compressor is burnt out

There are many types and types of low temperature valves. Now taking the low temperature stop valve as an example, the common failures can be divided into three categories: the first category: the failures occurring on the top of the valve. The valve top (valve head) of this kind of valve is connected with the valve stem by movement, so that when the valve is closed, the two sealing surfaces can be "corrected automatically ". After long-term use, sometimes the lock nut is loosened due to the damage of anti-back gasket, and finally the top of the valve falls off when opening the valve. At this time, the valve will lose its function of closing. Sometimes the damage of the lock nut is caused by the improper material and the replacement of cold and fragile metal. Another common fault is that the valve top is not closed strictly, that is, the valve leaks. The common reason is that the sealing surface of the valve top and the valve seat is crushed by hard objects (such as hard objects suc...