NIBCO LD-2000 series butterfly valves feature a threaded collar bushing (non-removable) for positive stem retention (blow-out proof), multiple body and stem o-ring seal options (EPDM, Buna-N, or Fluorocarbon), and an extended neck for insulation up to 2".
The valve body fully supports its molded-in liner at flange seals. This eliminates leakage between the body and liner, which may happen in cartridge or boot-type liners. In addition, it provides dead-end service without the need for a flange on the downstream side. Stainless steel stem materials with a one-piece thru-disc design provide strength. The upper and lower bushings are standard for smooth valve operation. A streamlined spherical disc offers high flow capacity.
The internal stem/disc drive on NIBCO LD-2000 butterfly valves eliminates the need for pins or bolts, which create additional leak paths, turbulence in the waterway, and/or flow reduction. In addition, their ductile iron body is more durable than cast iron and reduces breakage.