071 BUTTERFLY VALVE P.073 P.079 P.083 P.087 P.090 P.091 P.095 P.097 P.099 P.101 P.104 BUTTERFLY VALVE TYPE 57 BUTTERFLY VALVE TYPE 56 BUTTERFLY VALVE TYPE 75 BUTTERFLY VALVE TYPE 56D, 75D BUTTERFLY VALVE TYPE 58 BUTTERFLY VALVE TYPE 55 BUTTERFLY VALVE TYPE 55IS LUG BUTTERFLY VALVE TYPE 57L LUG BUTTERFLY VALVE TYPE 57TL PDCPD LARGE SIZE BUTTERFLY VALVE ROTARY DAMPER