DN125 Knife Gate Valve (5 Inch)

The DN125 Knife Gate Valve is a professional industrial valve designed with a sharp-edged gate that effectively cuts through fibrous, granular, or viscous media. This valve offers excellent shut-off performance and sealing capabilities, making it ideal for demanding applications in pulp & paper, wastewater treatment, mining, and other process industries.

Technical Specifications

Basic Parameters

Nominal Diameter: DN125 (5 inches)
Connection Type: Flanged, Wafer, Welded
Structure: Rising stem, Non-rising stem
Actuation: Manual, Pneumatic, Electric, Hydraulic
Flow Direction: Bidirectional sealing

Pressure Ratings

Nominal Pressure: PN6, PN10, PN16, PN25
Working Pressure: 0.6-2.5 MPa (87-363 PSI)
Test Pressure: Per GB/T 13927, API 598 standards

Temperature Range

Operating Temperature: -20°C to +200°C (-4°F to +392°F)
Media Temperature: Depending on seal material selection

Key Features

Structural Advantages

Knife-Edge Gate: Sharp cutting edge effectively shears fibrous and sticky media
Full Port Design: Unrestricted flow path when fully open, minimal pressure drop
Bidirectional Sealing: Reliable sealing from both upstream and downstream
Compact Design: Short face-to-face dimension, space-saving installation

Performance Benefits

Superior Cutting Capability: Handles fibrous and particulate media effectively
Excellent Sealing: Resilient seat design ensures reliable shut-off
Easy Operation: Low operating torque for effortless operation
Low Maintenance: Simple design reduces maintenance costs

Material Options

Body Materials

Cast Iron: HT200, HT250
Carbon Steel: WCB, A216 WCB
Stainless Steel: CF8 (304), CF8M (316), CF3 (304L), CF3M (316L)
Alloy Steel: WC6, WC9

Gate Materials

Stainless Steel: 304, 316, 316L, 17-4PH
Alloy Steel: Selected based on media requirements
Surface Treatment: Hardening, coating options available

Seal Materials

Nitrile Rubber (NBR): Oil and water applications
EPDM: Steam and hot water service
Viton (FKM): Chemical resistance applications
PTFE: Highly corrosive media

Applications

Primary Industries

Pulp & Paper: Pulp stock, white water systems
Wastewater Treatment: Sludge handling, effluent systems
Mining: Slurry transport, tailings processing
Food Processing: Fruit pulp, syrup, viscous products
Chemical Processing: Chemical slurries, catalyst handling

Typical Service Conditions

Fibrous media pipeline systems
Solid-laden slurry transport
Viscous media shut-off control
Corrosive media sealing requirements

Installation & Maintenance

Installation Requirements

Verify valve specifications match design requirements
Ensure pipeline flanges are flat and bolt specifications are correct
Install valve in closed position
Provide adequate clearance for operation and maintenance

Maintenance Guidelines

Regularly inspect sealing surfaces and gate wear
Maintain proper lubrication of operating mechanisms
Periodically test valve opening and closing performance
Replace worn components as needed

Design Standards

Compliance Standards

Design: API 6A, ASME B16.34
Testing: API 598, ISO 5208
Face-to-Face: ASME B16.10, EN 558
Flanges: ASME B16.5, EN 1092

Quality Certifications

ISO 9001:2015 Quality Management
CE Marking (where applicable)
API 6A Certification
Material Certificates per EN 10204 3.1

Ordering Information

Model Code

DN125-KGV-[Pressure Rating]-[Material]-[Actuation]-[Connection]

Information Required for Ordering

Nominal diameter and pressure rating
Service media and temperature range
Body and trim material requirements
Actuation type and connection style
Special technical requirements

Available Options

Actuators: Manual handwheel, pneumatic, electric, hydraulic
Connections: RF flanged, RTJ flanged, wafer, lug style
Coatings: Epoxy, polyurethane, specialized coatings
Testing: Standard factory test, witnessed testing, special certifications

Quality Assurance

Factory testing per ISO 5208 and API 598 standards
Material certificates and test documentation provided
Comprehensive warranty coverage
Global technical support and service network
Spare parts availability guarantee

Technical Support

Our experienced engineering team provides:

Application consultation and valve selection
Custom design solutions for special requirements
Installation and commissioning support
Training programs for maintenance personnel
24/7 technical support hotline

Note: This product can be customized according to specific customer requirements. Final technical parameters are subject to confirmed drawings and technical agreements.

For additional technical information, quotations, or application support, please contact our technical sales team.