Bolted Bonnet Metal-seated Knife Gate Valves

Features and benefits
NO LEAKAGE TO THE EXTERIOR THROUGH PACKING CHAMBER (UNLIKE STANDARD KNIFE GATE VALVE)
 Bonnetted design: Standard body-bonnet joint with an efficient non-asbestos reinforced fiber or PTFE gasket.
 Long-life leakproof stem seal: Standard packing chamber with 125 RMS wall finish, burnished non-rotating stem and PTFE or graphite packing rings. Many times the cycle life of a standard knife gate valve.
 Virtually no contamination of the environment: No dewatering of stock, unlike standard knife gate valves.
  Easy repacking in-line. (Valve should be de-pressurized when repacking in-line.)

TIGHTER SEATS WITH PATENTED TORQUE CLOSURE OF KNIFE
  Beveled knife-stem connection locks the knife blade tight against the seat. The seat is sealed by positive torque closure ?C not media pressure ?C unlike any other knife gate valve.
 Raised-face seat: A groove around the seat collects particles pushed aside by the knife and prevents clogging. When the valve opens, media pressure cleans the groove.
 Lapped seat ensures tight closure.
 Crimped resilient seat ensures longer service life.
 Four seat designs: Integral, resilient and renewable Stellite 6.

BYPASS TO PREVENT CLOGGING OF BONNET
 Bypass lets pulp circulate inside the bonnet when valve is opened, preventing clogging (patent # 2093539 CDN and # 5295661 U.S.)

EASY OPERATION
 Lower running torque due to reduced friction: Friction between stem and packing in bolted bonnet knife gate valve is far less than the friction between the blade and the packing in a standard knife gate valve.
 Low-friction, acid-resistant Ni-Resist stem nut: Valves can operate with smaller actuators than standard knife gate valves.

ALL CAST STAINLESS STEEL DESIGN
 One-piece stainless steel, fully-lugged, cast body is stronger than welded bodies and less subject to distortion due to thermal stress. Posts are stainless steel instead of chrome-plated carbon steel for longer life.
 Designed for vertical or horizontal line operations.
 Standard wafer, TAPPI face-to-face for easy replacement of leaky standard knife gate valves.
 Maintenance and adjustment-free. Long cycle life.
 Suitable for most pulp and paper applications. Can be used throughout the mill as a general-purpose knife gate valve.