LQ-DT
Drop-through Rotary Valve
Straight-through geometry for high-capacity discharge of granules with minimal shear.
LQ-SR · Product
Standard Rotary Airlock Valve
General-purpose airlock for gravity discharge of free-flowing powders and granules.
Product Overview
The standard rotary airlock valve is the workhorse of powder handling: a multi-vane rotor turns inside a close-clearance housing to discharge bulk solids from a hopper or cyclone while limiting air leakage between two pressure zones. It is the specification we build most often for dust collectors, silos, screw conveyors and gravity-fed process lines where the material is free-flowing and moderately abrasive.
Product Structure
Housing
Fabricated or cast housing with machined rotor bore, bolted top and bottom flanges, and an inspection cover for rotor access.
Rotor
8-vane open or closed rotor, machined to the specified tip clearance; replaceable wear strips available on abrasive duties.
Shaft & bearings
Through shaft in 40Cr or stainless, outboard bearings in a greased housing, isolated from the material stream by a packing or lip seal.
Sealing
Adjustable gland packing as standard; mechanical seals, air-purge seals or shaft air-purge for fine powders and vacuum duty on request.
Drive
Geared motor direct-coupled to the shaft, or chain and sprocket drive where a compact footprint is required.
Typical Specifications
| Valve size | DN150 – DN500 typical; other sizes built to drawing |
|---|---|
| Rotor | 8 vanes, open or closed type |
| Rotor speed | 15 – 30 rpm typical, VFD option |
| Drive | Geared motor 0.55 – 3.0 kW, direct or chain |
| Housing material | Carbon steel / 304 / 316L |
| Rotor material | Carbon steel / 304 / 316L, hard-faced on request |
| Operating temperature | Up to 200 °C standard build |
| Connection | Square or round flange, drilled to customer pattern |
Values shown are typical for this product family. Final dimensions, materials and performance are confirmed on the approved drawing before production.
Design Features
- Sizes and flange drilling built to your drawing, including non-standard bolt patterns
- Open, closed or scalloped rotor to suit the material and leakage requirement
- Tip clearance set per application, with replaceable wear plates on abrasive duties
- Direct drive or chain drive, with torque limiter, shear pin or VFD as required
- Surface finish and paint system selected for the installation environment
Material Options
- Carbon steel with industrial paint system — general dry powders
- 304 stainless steel — food-adjacent and mildly corrosive materials
- 316L stainless steel — chemical powders, chlorides, washdown areas
- Wear-resistant overlay or ceramic-lined rotor tips — abrasive minerals
Customisation
Every valve in this range can be built to your drawing: face-to-face length, flange pattern, rotor profile, material grade and drive arrangement. Send your drawing and we will quote against it.
Frequently Asked Questions
Can you manufacture to my existing valve dimensions?
Yes. Send the drawing, a dimensional sketch or the original nameplate data and we will build a drop-in replacement with the same face-to-face length and flange pattern.
How do I choose between an open and a closed rotor?
Open rotors handle free-flowing, low-moisture materials and are easier to clean. Closed rotors give better volumetric efficiency and are preferred for fine powders, vacuum duty and materials that tend to pack into the pockets.
What leakage rate can the valve achieve?
Leakage depends on tip clearance, rotor speed, differential pressure and particle size. We set clearance against your allowable air loss and confirm the figure on the approved drawing rather than quoting a single generic number.
Looking for a reliable rotary airlock supplier?
Send us your drawings or application requirements. Let us find the right solution for your equipment.