Air operated valves include many types pneumatic solenoid valves,air pilot valves,air mechanical valves,and some hand valves,also named as hand switches,pneumatic switches,like foot valves also be named as foot pressure switch.Others like some accessory valves,like silding valves,quick exhaust valves,check valves,non-return valves,flow control valves ,ball valves,blow off valves and etc.