Hydraulic PU Lined Flanged Knife Gate Valve
Extreme Thrust and Ultimate Abrasion Resistance for Slurry Automation
The Hydraulic PU Lined Flanged Knife Gate Valve is the professional-grade isolation and control solution designed for the most demanding applications involving highly abrasive, high-solids content slurries under moderate to high pressures. It is the definitive choice for automated processes in mining, power generation, and wastewater treatment where reliability and maximum thrust are non-negotiable.
The valve features an integral Polyurethane (PU) lining on all media flow parts, providing superior, long-lasting resistance to wear and erosion. Coupled with a Hydraulic Actuator, this valve delivers consistent, ultra-high thrust to reliably cut through and seal against compacted or crystallized slurries, guaranteeing absolute zero leakage and extended service life.
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 | Hydraulic Actuation | Provides highest available thrust and stable force, ensuring reliable closing even against dense, stubborn, or high-pressure slurry columns. |
| 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
- HPU Integration: Can be supplied with a pre-configured Hydraulic Power Unit (HPU) tailored to the valve size and cycle requirements.
- Actuator Features: Options include fail-safe mechanisms and sophisticated hydraulic controls for precise velocity and position adjustments.
- Custom Materials: Body material can be upgraded to Stainless Steel for environments with high external corrosion risk.
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