Manual Handwheel Split-type PU Lined Knife Gate Valve
Bi-Directional, Zero-Leakage Isolation for Extreme Abrasion
The Manual Handwheel Split-type PU Lined Knife Gate Valve is the ultimate isolation solution engineered for heavy-duty abrasive slurry applications, particularly in the mining industry. It is specifically designed for reliable, bi-directional tight on-off service where traditional knife gate valves fail due to erosion.
The core of this valve is the full-lined, wear-resistant Polyurethane (PU). The PU is injected with a whole mold, completely wrapping all media contact parts to achieve all-round wear-resistant protection. This provides excellent wear life and guarantees 100% positive shutoff of abrasive slurry. The 2-piece split body construction ensures the valve is easy to maintain, significantly lowering the total cost of ownership.
Key Features & Slurry Performance
| Feature Category | Technical Detail | Core Operational Benefit |
| Wear Resistance | Full-Lined Polyurethane (PU) | Integral pouring forms an abrasion-resistant lining that wraps all media flow paths, providing all-round wear protection. |
| Sealing Security | Bi-directional Flow, Zero Leakage | Guarantees zero leakage and positive shut-off in both directions, allowing flexible installation and enhanced safety. |
| Maintenance | 2PC Split Body Construction | The split-type body is designed for ease of maintenance. The PU liner is replaceable on site in all sizes, significantly lowering cost of ownership. |
| Gasket Elimination | Integral Flange Seals | The polyurethane liner has integral flange seals, eliminating the need for separate flange sealing gaskets during installation. |
| Flow Path | Full Port Designing | When fully opened, the disc is fully lifted into the PU inner chamber, avoiding direct contact and preventing wear caused by media erosion. |
| Operation Type | Manual Handwheel | Provides reliable and cost-effective operation for intermittent shut-off where external power is unnecessary. |
| Environmental Protection | Sealing Ring between Body & Liner | A sealing ring prevents media leakage between the valve body and the PU lining, protecting the surrounding environment. |
Technical Specifications
| Parameter | Specification | Notes |
| Nominal Size Range | DN $50$ to DN $800$ | Standard manufacturing range (2″ to 32″). |
| Pressure Range | PN $6$ to PN $16$ | Suitable for moderate pressure slurry lines. |
| Service Temperature | $-20^\circ\text{C}$ to $80^\circ\text{C}$ | Temperature range limited by the Polyurethane (PU) material. |
| Leakage Class | Zero Leakage (Bi-Directional Shut-off) | |
| Connection Type | Wafer, Lug, Flange | Versatile installation options. |
| Face to Face | GB/T 12221 Standard | Ensures dimensional compatibility. |
| Pressure Test | GB/T 13927 Standard | Compliant with recognized pressure testing standards. |
Major Component Materials
| Component | Material | Notes |
| Body | WCB (Carbon Steel), CF8 (SS304), CF8M (SS316) | Split Body design for ease of maintenance. |
| Liner/Seat | Polyurethane (PU) | Abrasion-resistant, replaceable lining. |
| Disc | Wear-resistant Stainless Steel Plate (with optional surface treatment) | |
| Actuation | Handwheel (Standard) | Other options: Bevel Gear, Pneumatic, Electric. |
Target Industry Applications
Polyurethane lined knife gate valves are ideally suited for heavy-duty applications where extreme abrasion requires zero leakage, including:
- Mining Industry: High-concentration mineral slurries and tailings.
- Coal Washing: Slurry and ash handling.
- Paper Industry: Fibrous and viscous media.
- Water Treatment: Sludge discharging and high-solids fluid management.
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