Hydraulic Resilient-Seated Slurry Knife Gate Valve
Zero Leakage and High Reliability for Abrasive Slurries
The Hydraulic Slurry Knife Gate Valve (Model PZ773 Type) is an exceptional isolation solution engineered for demanding heavy slurry services. It is specifically designed to handle highly abrasive and erosive media found in mining, paper, and wastewater industries, ensuring zero leakage both when fully open and fully closed.
Driven by a Hydraulic Actuator, this valve provides the necessary high thrust to reliably cut through and seal against concentrated, settled, or crystallized slurries. Its core strength lies in the replaceable, high-performance special rubber seat and the durable, low-pressure design, resulting in extended service life and significantly reduced maintenance costs.
Key Features & Slurry Performance Advantages
| Feature Category | Technical Detail | Core Operational Benefit |
| Sealing Security | Zero Leakage (Tight Shut-off) | Guarantees absolute isolation when fully closed, essential for heavy slurry and containment applications. |
| Wear Resistance | Special Rubber Seat with Embedded Reinforcement Ring | The seat offers excellent abrasion resistance and extended durability, ensuring safe use even in the harshest service conditions (e.g., slag and mining tailings). |
| Maintenance Cost | Replaceable Seat and Stainless Steel Gate | The seat can be quickly replaced, significantly saving on maintenance costs and maximizing uptime without needing to replace the entire valve body. |
| Actuation Power | Hydraulic Actuation | Provides stable, ultra-high thrust, reliably driving the gate through dense, high-concentration slurries where other actuators might fail. |
| Versatility | Wide Application Range | Extensively used in slag, mortar, mud, coal slurry, papermaking, and municipal sewage treatment. |
| Material Integrity | Non-Corrosive Materials | Stainless steel gate and special rubber seat ensure resistance against common slurry constituents. |
Technical Specifications
| Parameter | Specification | Notes |
| Nominal Size (DN) | DN 50 – 600 | Sizes up to 48″ also available. |
| Pressure Rating | 0.25MPa\2.5 Bar / ASME Class 150 (Low Pressure) | Optimized for low-pressure, high-solid-content applications. |
| Applicable Temperature | -10℃～+120℃ | Suitable for most industrial slurry process temperatures. |
| Leakage Class | Zero Leakage (when gate is fully open or fully closed) | Bidirectional sealing performance. |
| Actuation Type | Hydraulic Cylinder | Available in Pneumatic, Electric, and Manual options upon request. |
Major Component Materials
| Component | Material | Notes |
| Body | Q235A Welded Steel + Special Rubber Lining | Durable structural steel with internal protection. |
| Gate | Stainless Steel (SS) | Corrosion resistance and high wear life. |
| Stem | Stainless Steel or Stainless Iron | Corrosion resistant, ensuring smooth operation. |
| Seat | Special Rubber (Resilient, Abrasion-Resistant) | Ensures bubble-tight seal and extended service life. |
Target Industry Applications
- Mining & Mineral Processing: Isolation of tailings, mineral slurries, and heavy ore transport lines.
- Wastewater Treatment: Reliable shut-off for raw sewage, sludge, and dewatering applications.
- Power Plants: Handling of coal slurry and ash slurry.
- Pulp & Paper: Isolation of fibrous and viscous media.
- General Industry: Control of abrasive media such as mortar and industrial mud.
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