NEW EDWARDS QSB-250-P electropneumatically operated quarter swing butterfly valves from stock with warranty. Edwards art.no. is B43003000
QSB quarter swing butterfly valves The QSB quarter swing valves are compact, quick acting, high conductance isolation valves. The QSB valves have a polished, stainless steel, ISO flanged body with fluoroelastomer “O” ring sealed valve plate and shaft. The valve plate “O” ring groove is vented to help maintain a stable high vacuum. The valve shaft “O” rings and bearings are lubricated with Fomblin® grease to prevent gas bursts from behind the shaft seals. The pneumatic operation valves each have microswitches to indicate when the valve is open or closed. The QSB250 P valve has a single acting actuator to open the valve and a spring to close the valve. The actuator link of all pneumatic operation valves is enclosed by a safety cover.