No. A knife gate valve designed for wastewater and one engineered for abrasive slurry do not necessarily meet the same service demands. Key operating parameters must be specified, including solids concentration, differential pressure, shut-off direction, seat configuration, and actuation requirements.
SLURRIES, ABRASION, AND SOLIDS
Technical Selection · Supply Across Quebec and Canada
Knife Gate Valves: Selecting the Right Construction
Solids passage alone is not enough. The seat design, sealing direction, differential pressure, and operating conditions must all be evaluated together.
Representative knife gate valve examples. Product family imagery shown; not a certified selection for your specific application.
UNDERSTANDING OUR SERVICES
01
Abrasive Particulates
Sand, mineral slurry, or suspended hard particles: inspect seats, closure member, and flow bore for wear.
To be specified: particle size, hardness, shape, and solids concentration.
02
Sludge and Scale Deposits
Slurry that settles or thickens during downtime can alter valve shut-off and restart conditions.
To be specified: consistency, downtime duration, and flushing capabilities.
03
Pulp & Effluents
Pulp, white water, and fibrous effluents require careful evaluation of the flow passage and accumulation risks.
Please specify: fibre type, entrained solids, and required operating function.
This section covers slurries and liquid-solid suspensions. Dry bulk powders, silos, and pneumatic conveying systems require a separate valve and seal selection.
COMPARE VALVE DESIGNS
Start with the function: complete isolation or flow modulation. A valve engineered to handle solids is not automatically designed for throttling or control service.
ISOLATE THE LINE
POTENTIAL SOLUTION TO EVALUATE
For isolation service in slurry and suspension lines. Select a valve engineered specifically for the application, not just based on pipe size.
AVM differentiates between mining slurry configurations and specialized coatings. Flow/pressure direction, seating, optional bleed ports, and operating torque remain to be confirmed.
Material construction to be confirmed based on operating conditions.
SOFT SEAT
POTENTIAL SOLUTION TO EVALUATE
Also known as a pinch valve. An elastomeric sleeve flexes to isolate or regulate flow, depending on the model's design.
Evaluate the sleeve compound, process fluid, temperature, pressure, and potential vacuum conditions. Modulating service must be explicitly specified.
A product family to evaluate, not an automatic direct equivalent.
FLOW MODULATION
DISTINCT FUNCTION
The flow path and internal components must withstand entrained solids across the entire operating range, including at low-opening conditions.
An isolation knife gate valve must not be used for continuous throttling without manufacturer validation.
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Specify required shut-off class
Flow direction, pressure on either side, shut-off with media solids present, and allowable leakage rates are all critical factors included in the specifications.
Prepare Selection Data ↓
Actuator Sizing
Pneumatic or electric: verify thrust/torque output, stroke, operating frequency, and fail-safe behaviour upon loss of power.
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VALVE SELECTION & SEALING SOLUTIONS
The valve, its actuator, and its sealing components are selected based on actual operating conditions. For pumps, the gland packing is engineered through its own dedicated selection process.
LATTYcore 7189 G · Graphite-core compression packing engineered for pumps and slurry applications.
SLURRY PUMPS · LATTY PACKING
LATTY introduces the 7189 G, engineered specifically for high-slurry fluids. Optimal selection depends on the process medium, speed, pressure, temperature, and pump flushing conditions. Please note that this specification cannot be directly transferred to valve applications.
Solids and Slurry Behaviour
Particle type, maximum particle size, particle size distribution, fibres, and concentration by mass or volume. Please also specify viscosity and settling tendencies.
Pressure, Flow, and Operating Conditions
Upstream and downstream pressures, flow rate, and temperature. Differentiate between body pressure rating, shut-off differential pressure, and modulating service.
Materials, Seats, and Sleeves
Evaluate abrasion and chemical compatibility separately. Specifying a stainless steel body alone does not validate the suitability of the seat, sleeve, or packing.
Operation and Maintenance
Stroke, thrust, available air supply, electrical power, and wear part accessibility. Specify cycle frequencies, shutdowns, and flushing requirements.
REPLACEMENT & RELIABILITY
CONDITION REQUIRING ASSESSMENT
Document the condition of the seat, deposits, break-away torque conditions, and differential pressure. Installing a more powerful actuator will not necessarily resolve solid accumulation or an unsuitable valve construction.
Identify the damage and record typical operating apertures, media solids, and pressure drop prior to ordering a like-for-like replacement model.
Inspect the condition of the stem or sleeve, the packing, and the assembly. On a pump, also verify the designated flush plan.
Differentiate between fibres, build-up, and operating faults. All inspections or maintenance procedures must strictly comply with the site's isolation and lockout/tagout (LOTO) protocols.
FREQUENTLY ASKED QUESTIONS
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YOUR PROJECT
Provide a part number, photos of the components, or a schematic, along with any available operating conditions. Our technical specialists will identify any missing specifications before evaluating designs and sealing performance.
The proposal specifies the selected configuration. Operating limits, availability, lead times, and documentation are confirmed in the quotation.
Your application details are being transferred to our contact form.
01
Fluid, solids, particle size, and concentration
02
Pressure, temperature, flow rate, and required duty
03
Part number, end connections, face-to-face dimensions, and actuation
04
Photos, observed wear, cycle counts, and shutdown conditions
Provide the details you currently have, and our technical team will work with you to clarify any remaining specifications.