Pneumatic conveying airlock
Feed product into a pressure or vacuum conveying line while limiting air leakage and maintaining stable product flow.
Rotary valves • Supplier selection • Replacement supply
Rotary airlock valve sizing & selection guide.
Rotary valve selection depends on material, capacity, pressure differential, rotor design and replacement fit. Use this guide to organize the details needed for a manufacturer-supported quote on a rotary airlock, feeder or collector discharge valve.
What determines rotary valve selection?
A rotary valve may meter product, maintain an airlock, discharge a collector or feed a conveying line. Those duties place different demands on the valve.
ProductBulk density, particle size, flowability, abrasiveness, temperature, moisture and whether particles may shear or jam.
CapacityRequired throughput, rotor speed, fill efficiency, inlet conditions and whether feeding must be consistent or accurately metered.
PressureDifferential pressure, vacuum or pressure service, acceptable air leakage and the condition above and below the valve.
ConstructionHousing and rotor material, clearances, rotor style, seals, drive, access, flange arrangement and wear protection.
Applications we can source for
The same nominal valve size can perform very differently depending on the duty and product.
Dust collector discharge
Discharge collected dust while maintaining separation between the collector and downstream equipment or atmosphere.
Gravity feeding and metering
Control discharge from bins, hoppers or process equipment where consistent feed rate and product handling matter.
Common selection and replacement issues
Replacing by flange size alone can repeat the original problem.
Air leakageValve size, rotor clearance, wear, pressure differential, rotor style and product condition all affect leakage.
Bridging or jammingLarge, stringy, cohesive or fragile material may require special inlet geometry, rotor configuration or operating practices.
Premature wearAbrasive product, high tip speed, unsuitable materials or poor clearances can shorten service life.
Inconsistent capacityActual throughput depends on bulk density, rotor volume, speed, fill efficiency, air effects and upstream feeding conditions.
You do not need a finished specification.
An equipment tag, nameplate photo, existing specification or brief description is enough to start an inquiry. We can ask suppliers what additional information they need before confirming an equipment quotation.
Possible outcomes
Additional application information requested
Budgetary equipment or component quote
Replacement equipment and accessory options compared
Manufacturer duty and compatibility confirmation
What to confirm before comparing rotary airlock quotations
Two valves with the same nominal opening may deliver different capacities, leakage rates and service life under the same conditions.
Product and required feed rate
State material, bulk density, moisture, particle size and target mass flow. Nominal rotor pocket volume alone does not determine real delivered capacity.
Pressure differential and air leakage
Record conditions above and below the valve and whether the service is pressure, vacuum or gravity discharge. Ask the supplier to verify sealing and leakage performance.
Clearance, rotor and wear design
Rotor geometry, housing clearances, wear provisions and bearing/seal protection should suit abrasive, fragile, sticky or temperature-sensitive products.
Mechanical and electrical fit
Check flange bolt patterns, face-to-face height, shaft/drive arrangement, motor supply, access space and any relevant safety or hazardous-location requirements.
Information to include with your RFQ: For immediate replacement pricing, use the rotary airlocks product page; this guide helps assemble the technical details for that quotation.
From part inquiry to delivery.
A practical sourcing process for single replacements and coordinated equipment orders.
Identify the part
Send a part number, photo, drawing or specification. We clarify the details needed to approach suitable suppliers.
Confirm your quote
Compare the proposed product, quantity, pricing, freight and available lead time before approving your order.
Arrange supply
Once the order is confirmed, we coordinate supplier fulfilment and shipping, and keep the part details available for repeat inquiries.
Before you request a quote.
Can you source a replacement from a nameplate?
A make, model or serial number is a useful start. Include flange dimensions, the material handled and operating duty so a supplier can confirm the proposed replacement.
What is included in a quotation?
The proposed product and quantity, pricing, available lead time and freight details are set out in the quotation. Availability and any outstanding specification checks are confirmed before ordering.
Do you design or install complete systems?
Our focus is sourcing and supplying components. We coordinate product questions with suppliers; complete system design, installation and performance verification are outside a standard supply quotation.
Can two rotary airlock valves with the same flange size be interchangeable?
Not automatically. Rotor geometry, height, shaft/drive position, clearances, materials, pressure rating and throughput can differ. Verify the operating duty and installation dimensions with the supplier before purchasing.
Request a rotary valve quote
Send the part details you have, quantity and delivery location. Email photos, drawings or nameplates to sales@canadianconveying.ca.