- All
- Product Name
- Product Keyword
- Product Model
- Product Summary
- Product Description
- Multi Field Search
| Quantity: | |
|---|---|
The ANSI flanged knife gate valve is a linear-motion isolation valve designed for on-off service in pipelines containing solids, slurries, and viscous media. Its thin, sharp-edged gate cuts through accumulated material as it closes, making it suitable for applications where conventional gate valves or ball valves may become clogged. This valve type finds use in mining operations, pulp and paper mills, wastewater treatment plants, food processing facilities, and chemical processing systems that handle fibrous or particulate media.
In mining and mineral processing, knife gate valves manage slurry lines containing ore particles and tailings. In pulp and paper manufacturing, they handle stock solutions and fiber suspensions. Municipal and industrial wastewater treatment facilities use these valves for sludge handling and grit removal systems. Chemical processing plants deploy them for crystalline and precipitated materials. The valve's through-port design allows full-bore flow when open, minimizing pressure drop and reducing the risk of material buildup in the pipeline.
The knife gate valve features a bi-directional sealing configuration with resilient seat materials. The gate edge shears through solids during closure, while the seat material provides a tight seal against the gate surface. Standard seat options include EPDM, NBR, and PTFE, selected based on the media characteristics and temperature requirements of the application.
Available in both wafer and lug-style ANSI flange configurations, the valve fits between pipeline flanges per ANSI B16.5 standards. The lug-style version allows installation in systems where one side of the pipeline needs to be disconnected without disturbing the opposite flange. Face-to-face dimensions conform to industry standard values for each size class.
Component | Material Options |
|---|---|
Valve Body | Cast Iron, Ductile Iron, WCB, CF8 (304), CF8M (316) |
Gate | 304 Stainless Steel, 316 Stainless Steel, Hardened Alloy |
Seat | EPDM, NBR, PTFE, Viton, Polyurethane |
Stem | 304 Stainless Steel, 316 Stainless Steel |
Packing | PTFE, Graphite |
Design and manufacturing follow ANSI B16.5 for flange dimensions and MSS SP-81 for knife gate valve design criteria. Pressure testing is performed according to API 598 standards. Materials comply with applicable ASTM specifications. Custom configurations for specific industry requirements are available upon request.
Size Range | Pressure Class | Temperature Range |
|---|---|---|
DN50 - DN600 (2" - 24") | Class 150 | -10°C to 80°C (EPDM seat) |
DN50 - DN600 (2" - 24") | Class 150 | -20°C to 200°C (PTFE seat) |
DN50 - DN300 (2" - 12") | Class 300 | -10°C to 80°C (EPDM seat) |
Note: Temperature ranges vary by seat material. Consult factory for applications outside standard ranges or for metal-seated configurations.
Each valve undergoes hydrostatic shell testing at 1.5 times the rated pressure and seat leakage testing at 1.1 times the rated pressure before shipment. Material certificates are available upon request for all pressure-containing components. Optional third-party inspection can be arranged for commercial procurement projects requiring independent verification.
Knife gate valves work with slurries, sludge, pulp stock, wastewater, granular materials, and viscous fluids containing suspended solids. They are not intended for precise throttling or for high-pressure gas service where zero leakage is critical.
Yes, pneumatic, electric, and hydraulic actuators can be mounted to the valve. The standard stem top connection accepts various actuator brands via adapter brackets. Manual handwheel operation is the standard configuration.
Standard sizes and materials typically ship within 15-25 working days. Custom material specifications or special coatings may require 30-45 working days depending on complexity and order quantity.
A knife gate valve has a thinner gate with a sharpened lower edge that cuts through solids, whereas a conventional gate valve uses a wedge-shaped disc designed primarily for clean liquid or gas service. Knife gate valves have a shorter face-to-face dimension and are more compact in overall height.
