Valves
Flap / Dump Valve
CYprocess flap valves — also called dump valves or ash discharge valves — empty dust-collector hoppers and silos while limiting air in-leakage. Counterweight double-flap designs open under material weight, and electric cam-driven double flaps give controlled airlock discharge.
Shanghai-built. Drawings come with the quotation, and material certificates are available on request. Factory and documents
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Overview
About Flap / Dump Valve
How this equipment works in powder handling lines and what to consider when selecting it.
Counterweight double-flap valves
Gravity-operated flaps use the weight of collected ash to open a conical sealing surface, then reseat under a counterweight with no motor drive. Working temperature is typically about 150 °C, with unloading rates from a few to tens of m³/h across common square sizes. Double-layer stacks improve airlock performance.
Electric airlock flap valves
A motor-driven crank, cam and linkage opens the upper and lower flaps alternately, so a continuous air seal is held while discharge is metered. Counterweights or springs reseat the plates. Openings commonly span about 150-900 mm, with motors from roughly 1.1 to 5.5 kW and temperature capability to about 350 °C.
Where it fits in the process
Features
Key Features
Design points that make the Flap / Dump Valve practical for industrial powder plants.
Specifications
Typical Specifications
Final sizing depends on material properties, capacity and plant layout. Request a project review for a tailored proposal.
| Types | Counterweight flap · Electric double-flap airlock |
|---|---|
| Gravity sizes | Typical 200×200 - 630×630 mm |
| Gravity capacity | About 3 - 35 m³/h, size dependent |
| Electric sizes | About 150 - 900 mm openings |
| Electric power | About 1.1 - 5.5 kW |
| Temperature | Gravity about 150 °C class; electric to about 350 °C |
| Flanges | Square or round |
Materials
Suitable Materials
Powder and granule categories typically specified with a flap / dump valve. Suitability is confirmed per project from bulk density, particle size, moisture and process conditions.
Combustion & process ash
fly ash, boiler ash, kiln dust
Minerals & cement
cement, limestone, quartz dust
Metal & foundry dust
foundry sand, mill scale, metal fines
Chemical powders
pigments, resins, soda ash
Food & grain dust
flour, starch, grain and feed dust
Not sure whether your material will convey? Send us a sample description and we will confirm before quotation.
Applications
Process Applications
Process points where this equipment is typically installed, from bulk intake through to packing.
Downloads
Catalogs & Datasheets
Technical documents related to this product and our powder handling range.
FAQ
Flap / Dump Valve FAQ
Common questions about selection, integration and quotation.
A flap valve has no rotor to jam, so it suits lumpy or sticky ash that would block a rotary valve. A rotary valve meters more precisely and holds a tighter air seal where discharge must be controlled against a pressure differential.
System partners
Related Products
Equipment commonly paired with Flap / Dump Valve in complete powder handling lines.
Engineering support
Enquire about Flap / Dump Valve
Share your material, capacity and plant layout. Our engineers will confirm sizing and send a tailored proposal.