Pneumatic PU Lined Flanged Knife Gate Valve
Automated Reliability and Ultimate Abrasion Resistance
The Pneumatic PU Lined Flanged Knife Gate Valve is the advanced solution for automated, rapid-cycle isolation and flow control in systems carrying extremely abrasive, high-velocity slurries and bulk solids. It is specifically designed to excel in demanding applications found in mining, power generation, papermaking, and wastewater treatment.
The core strength of this valve lies in its integral Polyurethane (PU) lining on all media flow parts, providing superior, long-lasting resistance to wear and erosion. This ensures a guaranteed Zero Leakage seal. The fast-acting Pneumatic Cylinder delivers the high thrust required for reliable shut-off against dense, high-solids content fluids and enables rapid, remote on/off cycling necessary for automated batch processes and emergency shut-off sequences.
Key Features & Performance Advantages
| Feature Category | Technical Detail | Core Operational Benefit |
| Abrasion Resistance | Full PU Lining on Media Contact Parts | All wetted parts are integrally lined with Polyurethane, providing exceptional resistance to abrasion and ensuring a long service life. |
| Sealing Security | Zero Leakage & Full Port | Achieves absolute zero leakage for both sealing and packing (via integral molded rubber packing), with a full-bore design to minimize pressure drop and turbulence. |
| Maintenance Cost | Replaceable PU Liner and SS Gate | The integral PU valve liner and Stainless Steel gate are replaceable, significantly reducing long-term maintenance costs and maximizing uptime. |
| Operation Safety | Pneumatic Actuation | Provides rapid, reliable on/off cycling, ideal for automated batch processes and frequent valve movements. |
| Pressure Handling | Higher Pressure Rating | Rated up to 2.5MPa (25 Bar) for smaller sizes, making it suitable for moderate-to-high pressure slurry lines compared to low-pressure rubber-seated models. |
| Application Range | Diverse Industry Use | Widely used in mining residue discharge, power generation, papermaking, and municipal sewage treatment. |
Technical Specifications (PU Lined Flanged Model)
| Parameter | Specification | Notes |
| Nominal Size (DN) | DN 50 – 600 (2″ to 24″) | Standard manufacturing range. |
| Applicable Temperature | -20℃～+100℃ | Suitable for general industrial temperature ranges. |
| Leakage Class | Zero Leakage | Bubble-tight shutoff guaranteed. |
| Actuation | Manual Chainwheel | Used for high-reach applications (typically above $1.7text{m}$). |
| Flange Type | Flanged Connection (Flange Standardized) | Ensures robust installation in piping systems. |
Pressure Ratings (MPa / Bar)
| Nominal Size Range | Pressure Rating (MPa) | Equivalent Bar Rating |
| DN 50 – 250 | 1.0MPa – 2.5MPa | 10Bar – 25Bar (and ASME Class 150) |
| DN 300 – 400 | 0.6MPa – 1.0MPa | 6Bar – 10Bar |
| DN 500 – 600 | 0.4MPa – 0.6MPa | 4Bar – 6Bar |
Major Component Materials
| Component | Material |
| Body | Cast Iron, Cast Steel, Stainless Steel + Polyurethane Lining |
| Gate | Stainless Steel |
| Stem | Stainless Iron, Stainless Steel |
| Seat | Polyurethane (PU) |
Customization and Options
- Actuator Features: Available with fail-safe air-to-open or air-to-close configurations, magnetic limit switches, and optional positioners for flow throttling.
- Custom Materials: Body material can be upgraded to Stainless Steel for highly corrosive external environments.
- Custom Manufacturing: The valve can be manufactured to user-specific designs and dimensions to match your piping system.
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