pneumatic ball valve with limit switch, Top quality and reasonable price , ... and prevent wedge being blocked,4, Manual valve with DN over or equal to NPS10", class 400 ... to NPS NPS 6", class 600-2500 pounds equip with rolling bearing, can be operated easily.5, Material ... prolong service life.DIN valves, BS valves also available,With out standing manufacter power, Welcome worldwide customers to order ...