Exhaust valve inlet and outlet installed anti impact use?

The general structure of the butterfly valve is symmetrical, regardless of entrance and exit, so there is no problem of anti loaded. Other structures of the regulating valve on the inlet and outlet installed anti, affects the valve flow characteristics, due to a change in the flow capacity of, sometimes also easy to make at the packing leakage. For the single seat valve, installed anti will make the unbalanced change direction, and even affect the stability of valve. In the high pressure regulating valve, the flow of the flow of choice, but also affect the service life.