Double Flap Valve for Dust-Free Powder Discharge
(Katup Double Flap untuk Pembuangan Serbuk Bebas Debu)
Double Flap Valve for Dust-Free Powder Discharge & Airtight Material Sealing
Overview
The double flap valve is a heavy-duty airlock discharge system designed for continuous, dust-free handling of fine powders and bulk materials such as cement, fly ash, lime powder, alumina, feldspar, and chemical powders.
Its dual-chamber structure ensures airtight sealing, prevents dust leakage, and eliminates material backflow while maintaining stable feeding performance.
This valve is widely used in:
✅ Cement plants
✅ Pneumatic conveying systems
✅ Dust collection systems
✅ Silo unloading systems
✅ Chemical and mineral processing industries
Features
✅ Continuous discharge with alternating flap operation
✅ Zero air leakage for stable pneumatic conveying
✅ Dust-free operation improves environmental control
✅ Handles high-temperature, abrasive, and fine materials
✅ Suitable for negative pressure and positive pressure systems
✅ Long service life with durable steel construction
✅ Compatible with existing silo outlets and dust collectors
See our dust collection solutions.
Working Principle
✅ Material enters the upper chamber
✅ Upper flap closes → lower flap opens
✅ Material discharges while maintaining air pressure balance
✅ Dual flaps work alternately to ensure continuous, dust-free feeding
✅ Prevents air escape, dust leakage, and material backflow
This principle enables the double flap valve to operate as an airlock valve, allowing material passage while maintaining system pressure integrity.
Matched with air-slide and pneumatic conveying lines
For a general definition of an airlock, please refer to Wikipedia – Airlock.
Applications
✅ Silo and hopper discharge
✅ Fly ash, cement, lime powder handling
✅ Dust collector discharge points
✅ Pneumatic conveying lines
✅ High-temperature or abrasive powder applications
✅ Bulk powder processing industries
Advantages
✅ Efficient dust-tight operation
✅ Stable feeding and smooth discharge
✅ Long-lasting heavy-duty construction
✅ Easy maintenance and low operating cost
✅ Suitable for harsh industrial environments
✅ Improved system efficiency in pneumatic conveying
FAQS About Double Flap Valve
What is a double flap valve used for?
A double flap valve is used for dust-free and airtight discharge of bulk powders and granular materials. It is commonly installed under silos, hoppers, dust collectors, and pneumatic conveying systems to prevent air leakage and material backflow.
How does a double flap valve work as an airlock?
A double flap valve operates with two alternating flaps. While one flap opens to discharge material, the other remains closed to maintain air pressure balance. This alternating operation allows continuous material flow while ensuring airtight sealing.
What materials can be handled by a double flap valve?
Double flap valves are suitable for cement, fly ash, lime powder, clinker, mineral powders, and other fine or abrasive bulk materials commonly used in cement plants and industrial processing facilities.
What is the difference between a double flap valve and a rotary valve?
A dust-free discharge valve is ideal for high-temperature, abrasive, or irregular materials and requires minimal maintenance. A rotary valve is better suited for metered feeding applications but may experience higher wear under harsh operating conditions.
Can double flap airlock valve be customized for specific applications?
Yes. Double flap airlock valve can be customized in terms of size, housing material, flap sealing design, actuator type, and inlet/outlet connections to match specific silo discharge, dust collection, or pneumatic conveying requirements.
Need a Reliable Double Flap Valve for Dust-Free Powder Discharge?
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