Acceptance criteria for breathing valves

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...

Solenoid valve controls the position of valve core through an electromagnetic coil to achieve the purpose of changing the flow direction of fluid, or to cut off or connect air source. The electromagnetic components of the commonly used four-way solenoid valve consist of fixed iron core, moving iron core, coil and other parts. The part of valve body consists of sliding valve core, valve body, sliding valve sleeve, spring base, etc. The working principle of four-way solenoid valve. When there is electricity flowing through the coil, excitation will be generated, and the iron core will be fixed to absorb the moving iron core. The moving iron core will drive the sliding valve core and compress the spring, which changes the position of the sliding valve core and thus changes the direction of the fluid. When the coil loses power, the sliding valve core is pushed by the spring's elasticity, and the iron core is pushed back to make the fluid flow in the original direction. This kind of sole...