Features The tilted disc releases the compression of the disc sealing after a few degrees of opening, which extends the durability and gives low operating torques The disc is fixated to prevent wear and fluttering The disc seal profile and rubber quality ensure low closing torques All rubber parts are multi approved Seal retainer ring of stainless steel The threaded bolt holes in the disc are corrosion protected with O-rings Replaceable seat ring of stainless steel pressed into the body and sealed with an O-ring Shaft of stainless steel with self-lubricating bearings The shaft ends are corrosion protected with a stainless steel security plate and a gasket Replaceable shaft sealing with an EPDM O-ring on a stainless steel ring, a back-up EPDM O-ring in the housing, and a flat NBR gasket Optional locking device Body and disc of ductile iron with fusion bonded epoxy coating in compliance with DIN 3476 part 1 and EN 14901, GSK approved