DeZURIK Extended Service Cast Stainless Steel Knife Gate Valves (KGC-ES)
DeZURIK Extended Service Life Cast Knife Gate Valves (KGC-ES) are designed for improved sealing, extended packing life and reduced maintenance in the toughest corrosive, abrasive liquid slurry or dry material applications including: Pulp and Paper, Mining, Waste Water, Chemical, Petrochemical, Power, Steel, Food Processing or other Industries. DeZURIK 2-24" KGC Knife Gate Valves conform to the requirements for design and production testing of AWWA C 520-10, First Edition.
The heart of the KGC-ES is the DeZURIK Exclusive Premium Packing System. This system features a tight tolerance machined packing chamber, rounded gate edge, anti-extrusion ring, and many packing options to meet the demands of your specific application. All of these features together will improve sealing, extend packing life, and reduce maintenance.
Depending on what your application requires, the cast body and packing gland are available in 304, 316, 317, 254-SMO, 2205 Duplex Stainless Steel or Hastelloy C. Other body and gate materials are available upon request. KGC-ES Knife Gate Valves are available in sizes 2-48" (50-1200mm) with metal, resilient or soft seated versions.
The actuator superstructure is heavy duty cast carbon steel or cast stainless steel to minimize corrosion. A variety of actuator options are available including handwheels, chainwheels, bevel gears, levers, pneumatic cylinders, hydraulic cylinders, and electric motors. A full complement of accessories is also offered.
Cast Gate Guides and Jams
The cast gate guides provide support for the moving gate and will not break off like welded guides. Cast gate jams at the bottom of the body hold the gate securely against the seat to assure positive shutoff. All KGC-ES valves can handle full reverse pressure without damage. The body has raised face end connections with drilled and tapped lugs.
High Flow Capacity
The 100% round port design allows high flow capacity and minimum pressure drop. DeZURIK’s KGC-ES valve seat I.D. is equal to the inside diameter of standard pipe (ASME B36.10).
Full Gasket Sealing Front and Back
For maximum gasket sealing the KGC-ES end connections conform to ASME B16.20 dimensions for spiral-wound gaskets.
DeZURIK Exclusive Rounded Stainless Steel Gate
Gates are available in 304, 316, 317, 17-4, 254-SMO, 410, 2205 Duplex Stainless Steel or Hastelloy C for corrosion resistance. The gate has a precision ground finish on both sides to prevent packing and seat damage. The beveled knife-like gate edge with a machined tooth on each side pushes away or cuts through solids in the flow stream.
• Provides superior sealing
• Improves packing life
• Requires less compression and thus reduces friction
• Eliminates sharp corners where leakage first occurs
DeZURIK Exclusive Premium Packing System Ensures Long-Life by Sealing, Scraping and Supporting
DeZURIK KGC-ES Valves have a unique packing system that ensures a long-life tight seal with minimal packing gland pressure. The Premium Packing System is available for general, moderate, severe, and high temperature applications. The machined packing chamber, rounded gate edge, and anti-extrusion ring form the base. The system is completed by careful selection of the packing material. Temperature, pH, and media properties will determine the most suitable packing option. KGC-ES valves can be re-packed without being removed from the pipeline. The KGC-ES packing system includes a number of features that:
• Extend service life
• Require fewer packing adjustments
• Reduce external leakage
• Ensure alignment of the gate
• Minimize friction and actuator thrust required
• Allow field replacement of packing
Metal, resilient or soft seated valves are offered in a 100%, round port design. The integral metal seated or the replaceable 17-4 PH Stainless Steel H900 Heat Treated version is available with shutoff capability exceeding current MSS-SP81 standards.
Resilient Seated Valves
Resilient seated valves are available for applications where drip-tight shutoff is required. Unlike valves which use an O-ring seal, DeZURIK KGC-ES Valves have a replaceable resilient seat designed especially for knife gate valve applications. The resilient seat material is molded on three sides of the stainless steel seat ring. When the valve is closed, the gate is pushed against the seat and held in place by the gate jams. When the valve is open, the gate moves away from the seat, allowing clearance, which prevents seat damage and reduces operating force. A variety of seat materials are available including Chloroprene, NBR, EPDM, Fluoro Rubber and Chloroprene, off white
Soft Seated Valves
Soft seated valves are available for applications concerned with color contamination.
- PTFE - Polytetrafluoroethylene, white
- Reinforced PTFE - Polytetrafluoroethylene
Low Rim-Pull Force
A strong investment cast clip complements KGC-ES’s robust construction. The single lead threads on the manual stem result in a lower required handwheel rim-pull force.
V-Orifice Design for Reliable Throttling and Modulation Control
An integral metal-seated V-port design is also available for reliable throttling control of thick slurries including paper stock. The constant V-orifice is maintained from open valve position to closed to prevent bridging or plugging and to ensure maximum control accuracy. Other orifice shapes available upon request.
To prolong valve life in particularly demanding services, deflection cones are available in 316 stainless steel or abrasion resistant cast iron per ASTM A532 with Brinell Hardness of at least 500 BHN or urethane.
Dry Material Handling
Click on the animation below to see how the KGC Knife Gate valve operates on a moving column of dry material. Notice how the valve slices through the dry material.
Extended Service Cast Stainless Steel Knife Gate Valves (KGC-ES) Specifications
304, 316, 317, 254-SMO, 2205 Duplex Stainless Steel, Hastelloy C 276. Other body and gate materials are available upon request.
304, 316, 317, 17-4, 254-SMO, 410, 2205 Duplex Stainless Steel or Hastelloy C
DEZURIK EXCLUSIVE PREMIUM PACKING SYSTEM:
- Rounded Packing Chamber machined to tight tolerance.
- Matching Knife Gate with rounded edges.
- Anti-Extrusion Ring and many packing material options to meet the demands of your specific application.
HIGH FLOW CAPACITY:
Valve Seat inside diameter (I.D.) is equal to the I.D. of standard (ASME B36.10) pipe.
2-48" (50-1200mm) - 150 psi C.W.P. (1030 kPa)
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