Yd400k High Performance Knife Gate Valve YD400K High Performance Knife Gate Valve (Gate Valve) YD400K High Performance Knife Gate Valve (Gate Valve) is designed for on-off and isolation services handling corrosive, abrasive and viscous liquids, abrasive slurries, pulp stock and dry materials. Specifications of YD400K High Performance Knife Gate Valve (Gate Valve): A)Body type: YD400K B)Body size: 2"~36" (50A~900A) C)Body rating: ANSI Class150,