SLV
Manual Knife Gate Valve
The SLV Manual Knife Gate Valve uses a sharp-edged gate that shears straight through slurries, fibres and bulk solids, operated by a simple handwheel. Its full-bore opening and thin body make it the practical choice for isolating media that would clog or jam a conventional valve.
Product Benefits
- Solids defeat ordinary valves: Ordinary gate, globe and ball valves rely on cavities and seats that solids-laden media quickly pack and disable.
- The blade clears its path: The knife gate's blade instead cuts through the medium and sweeps its own path clear on every stroke.
- Unobstructed full bore: With the gate fully raised the bore is clear, so pressure drop is minimal and the line can even be pigged or rodded.
- Self-contained operation: Handwheel operation needs no air or power supply, so the valve stands entirely on its own.
- Slim, light body: The thin body takes far less flange-to-flange space and weight than a wedge gate valve of the same size.
Where It's Used
- Stated applications: The listed services are paper pulp, coal ash, chemical raw materials, wastewater and food-industry media.
- Fibres, solids and sludge: In short, it belongs anywhere the flow carries fibres, solids or sludge.
- Process industries: That makes it a staple in pulp and paper stock lines, ash and slurry handling, effluent treatment and bulk material processing.
Good to Know
- Service limits: Knife gate valves are isolation valves for lower-pressure, moderate-temperature service.
- Open or closed, not throttling: They are meant to be run fully open or fully closed; throttling erodes the gate and seat. Keep those limits in mind when placing them in a system.
- Packing gland maintenance: The gate passes through the packing on every stroke, so the gland is the natural maintenance point, and periodic adjustment keeps the stem area tight.
- Actuated versions exist: For frequently cycled lines, the same valve concept is available with actuated drives, but the manual version remains the simplest and most economical.
