Metal-seated discs in ZeroLeak Neldisc are impregnated with polymer to allow shutoff in temperatures ranging from cryogenic to 608°F. All-metal, one-piece floating seat is not sensitive to temperature changes, dirty operating media, or high-velocity flows. Minimized friction on sliding surfaces reduces breaking force and operating torque, allowing use of smaller actuators. Valve maintains ANSI Class 5, ISO 5208 Rate D shutoff during serious fires. Seats can be easily retrofitted into existing valves.