Slurry Knife Gate Valves Manufacturers

Our Slurry Knife Gate Valve Range

Four model families cover the majority of abrasive slurry isolation duties. The differences lie in body construction, gate thickness, sealing arrangement and pressure capability, so the selection follows the process conditions rather than a single default model.

Application Fit and Process Conditions

Slurry knife gate valves are isolation devices, not control valves. They perform best where the line must be opened or closed reliably under high solids loading, and where a straight-through bore prevents material from settling or bridging. Typical installation points include tailings return lines, pump discharge headers, cyclone feed isolation, thickener underflow and ash handling systems.

• Mining and mineral processing: ore slurry, tailings, concentrate lines, cyclone feed.
• Power generation: bottom ash, fly ash slurry, FGD limestone slurry.
• Chemical and alumina: abrasive chemical slurries, red mud, bauxite residue.
• Pulp and paper: high-consistency pulp, paper stock, coating slurries.
• Cement and steel: dust collection slurry, mill scale, slag handling.

Media with fibrous content, large particles or rapid settling behaviour benefit from the shearing gate action and the absence of a seat cavity. Where the process requires throttling, we recommend pairing the knife gate valve with a Zero Leakage Pinch Valve or an Air Operated Pinch Valve for modulating duty.

Critical Specifications and Configuration Options

Every KGV valve is built to a configuration sheet. The following parameters define the mechanical envelope, sealing performance and actuation interface.

Actuation and Automation Integration

We supply manual, pneumatic, electric, hydraulic and combined actuation. The bracket design allows the stem nut to be removed from the top and replaced on site for cylinder or bevel gear actuation without welding, which simplifies later automation upgrades.

• Manual handwheel: DN15–DN100, ≤PN16, low cost and minimal maintenance.
• Worm gear: DN50–DN400, ≤PN25, torque amplification for larger gates.
• Pneumatic on-off: DN100–DN1200, ≤PN40, 1–5 second response, suitable for high-frequency cycling.
• Pneumatic modulating: for controlled positioning where partial stroke is required.
• Electric and hydraulic: on-off, modulating or explosion-proof configurations.

Position feedback, solenoid valves and limit switches are specified to match the plant control system. Open/close positioning brackets are standard for sizes DN400 and below, with fixed-position pins available from the factory or prepared by the user.

Materials, Wear Resistance and Sealing Design

The sealing system uses two heavy-duty elastomer bushings that compress against the gate to form a blind-plate shut-off. No metal components contact the slurry, and there is no seat cavity where solids can accumulate. The secondary seal is dynamically self-adjusting and lubricated, so it does not require periodic packing adjustment.

• Full-bore, unobstructed flow path reduces turbulence and pressure loss.
• Knife-edged gate shears through settled solids and scrapes the sealing surface.
• Replaceable sealing bushings can be changed on site without removing the valve from the line.
• Controllable flushing stroke prevents over-insertion of the gate and reduces bushing stress.
• All bolts are fitted with lock washers for vibration resistance.

Quality Assurance and Compliance

Our manufacturing system is certified to ISO 9001, ISO 14001, ISO 45001 and ISO 50001. Products carry CE, RoHS and TR-CU (EAC) certification. In-house vulcanization and rubber refining equipment, together with raw material testing facilities, support the elastomer components that determine sealing life in abrasive service.

Each valve is pressure-tested and seat-tested before dispatch. Test certificates, material certificates and dimensional records are prepared according to the project documentation requirements agreed at order stage.

Installation, Maintenance and Serviceability

Slurry knife gate valves install between flanges with no additional gaskets required, because the sealing bushings isolate the medium pressure directly. The valve can be mounted in any orientation, but vertical lines and pump discharge points benefit from the high-pressure KGV-H design.

• Gate can be fully withdrawn from the slurry in the open position for inspection or replacement.
• Sealing bushings are field-replaceable without welding or special tooling.
• Lubrication system supports long intervals between service interventions.
• Spare bushings, gates and secondary seals are available as separate line items.

Information We Use to Configure Your Solution

To prepare a firm configuration and quotation, we need the following project data. Where some values are not yet fixed, we can work from the design basis and confirm the final selection at drawing approval stage.

Send the working point and line data through the inquiry form, and we will return a model recommendation, dimensional drawing and quotation. For lines that also require throttling or zero-leakage isolation, we can combine knife gate valves with Hose Pump and pinch valve technology from the same manufacturing base.

Frequently Asked Questions