Type of feeder and valve

When considering a discharge valve, the first issue is sizing it to avoid flow impediments. This generally means that inside dimensions should be over-sized with respect to the section immediately above to which the valve is to be attached. Over-sizing the inside dimensions 

Slide gates and butterfly valves are the most common discharge valves, while in some applications a pin gate is used. Whatever the type of valve that is chosen, it should generally be used only for maintenance purposes, i.e. operated fully open or fully closed, and not used to control the rate of discharge. 

---