Manual Bi-directional Ceramic Knife Gate Valve

Our Manual Bi-directional Ceramic Knife Gate Valve (also known as a Round Slide Gate or Slag Discharge Valve) is specifically designed for high-abrasion, high-pressure environments where flow may occur in either direction. By combining bi-directional sealing technology with the extreme hardness of structural ceramics, this valve provides a bubble-tight seal and an exceptional service life in the most punishing slag-handling applications.

Core Advantages: Why Bi-directional Ceramic?

1. Dual-Pressure Sealing Integrity

Unlike standard knife gate valves that only seal against pressure from one side, our bi-directional design ensures a perfect seal regardless of the medium’s flow direction. This is critical for systems with potential backflow or for isolation in circulating loops.

2. Diamond-Grade Wear Resistance (HRA 88+)

The internal flow channel and the primary sealing faces are lined with high-toughening structural ceramics. With a hardness second only to diamond, these components easily withstand the high-velocity impact of:

Bottom Ash & Slag: Sharp, abrasive particles from power plant discharge.
Mineral Tailings: High-concentration ores in mining processes.
Coal Slurry: Viscous and abrasive mixtures in coal washing plants.

3. Self-Cleaning “Round Slide” Mechanism

The circular gate (plug) features a sharp, polished edge that performs a scraping action every time the valve is operated. It physically clears debris, scales, and sticky colloids from the ceramic seat, ensuring that the sealing surface remains clean and effective for thousands of cycles.

Key Technical Features

Zero Clogging Design: The internal chamber is engineered to be “self-flushing,” preventing the accumulation of ash or slag that typically causes jamming in conventional valves.
Compact & Lightweight: The ultra-short face-to-face structure saves space and reduces the mechanical load on your piping support system.
Flexible Orientation: Can be installed at any angle (horizontal, vertical, or tilted) to accommodate complex plant layouts.
Versatile Drive Options: While equipped with a high-torque manual handwheel for precise control, the valve can be easily retrofitted with Electric, Pneumatic, or Hydraulic actuators via a standard mounting pad.

Technical Specifications

Feature	Details
Sealing Type	Bi-directional Ceramic-to-Ceramic (Zero Leakage)
Body Materials	WCB (Cast Steel), CF8 (SS304), CF8M (SS316)
Liner/Seat Material	Toughened Structural Ceramics (Alumina/Zirconia)
Nominal Pressure	PN6, PN10, PN16, Class 150
Temperature Range	Standard: ≤200°C (Customizable up to 650°C)
Operation	Manual Handwheel (Standard) / Gearbox (Optional)
Connection	Wafer or Lug Type (ANSI, DIN, JIS, GB Standards)

Primary Applications

Power Plants: Dry ash systems, slag flushing lines, and FGD (Flue Gas Desulfurization) slurry.
Mining & Metallurgy: Tailings transport, mineral concentrate lines, and slag discharge.
Coal Industry: Coal washing, coal-water slurry transport, and stonework handling.
Construction & Pulp: Cement discharge, paper pulp with abrasive contaminants, and industrial sewage.

Why Upgrade to Our Bi-directional Slag Valve?

In heavy-duty slag discharge, “Standard” valves are a liability—they leak, they jam, and they require frequent replacement. Our Ceramic Slag Valve is a “Fit and Forget” solution. By switching to bi-directional ceramic technology, facilities typically reduce their maintenance costs by over 70% and eliminate the risk of environmental contamination from leaks.