Pneumatic Y-pattern Drain Valve Pneumatic control valve,pneumatic Y-type control valve, Y-type control valve,control valve Pneumatic Y-pattern Drain Valve,Drain Valve,Y-pattern Drain Valve Application Pneumatic drain valves are installed in steam pipes of thermal power unit According to their site can be divided into: 1.Main steam line drain valves 2.Hot reheat line drain valves 3.Cold reheat line drain valves 4.First stage,second stage,third stage,forth stage,fifth stage and