Description1,Website:http://www.hugo-valve.com, eccentric semi-ball valve adopted eccentric wedge tight theory to reach open, close or ... off function to realized reliable sealing. 2, used thermometal for valve and semi ball, weld different alloy steel on the ball, the ... reliable seal to prolong the valve's longevity.Valve materials Body material : WCB,LCB,304, 316,WC9 Semi-ball material : WCB+chrome, ...