... Flange ends full weld ball valve and Welded ends full weld ball valve,we have standard Fully welded Ball Valve, Gear type Fully Weld Ball Valve, Forged Steel Fully Welded Ball Valve, Gas exhaust underground Fully Welded Ball Valve ... as the pipeline system, maintenance-free no adjustment or lubrication with no running costs, Bi-Directional ValveSize: 1/2"-56", DN15 ...