... seal creadible and prevent wedge being blocked,4, Manual valve with DN over or equal to NPS10", class 400 pounds and ... equip with rolling bearing, can be operated easily.5, Material of main body, material of trims, packing, washer, material of fastener can ... status, prolong service life.DIN valves, BS valves also available,With out standing manufacter power, Welcome worldwide customers to order specail ...