Flap Valve for Silo, Hopper & Bulk Material Discharge Systems
(Katup Flap untuk Sistem Pembuangan Material dari Silo & Hopper)
Reliable flap valve for controlled discharge of powders, granules, fly ash, and bulk solids
Overview
Flap valves are widely used at the bottom of silos, hoppers, cyclones, dust collectors, and bulk material handling systems to provide controlled and dust-free discharge of powders, granules, fly ash, cement, and fine bulk solids.
The simple single-flap or double-flap structure ensures reliable material flow, prevents backflow, and reduces air leakage in pneumatic conveying lines, negative-pressure systems, and industrial ventilation networks.
Flap valves are common in cement plants, lime plants, mining, chemical industries, food powder systems, and ash collection systems.
Industrial discharge valves are widely used as bulk material discharge valves in silo, hopper, cyclone, and dust collection systems, especially where controlled material flow and airlock performance are required.
Features
✅ Tight sealing to prevent dust and air leakage
✅ Wear-resistant design for abrasive powders
✅ Smooth material flow without blockage
✅ Long service life with robust steel construction
✅ Suitable for powders, fine granules, and fly ash
✅ Manual, electric, or pneumatic operation
✅ Available in single-flap and double-flap designs
✅ Compatible with silos, hoppers, cyclone separators, dust collectors
✅ Ideal for negative-pressure and pneumatic conveying systems
Technical Specifications
| Item | Specification |
|---|---|
| Valve Size | 150–1000 mm (customizable) |
| Structure | Single-flap / Double-flap |
| Body Material | Carbon steel / Stainless steel |
| Sealing | Wear-resistant rubber / alloy steel |
| Operation Mode | Manual / Electric / Pneumatic |
| Applications | Cement, fly ash, powder, fine granules |
*Technical specifications are for reference only and can be customized upon request.
Suggested related system:
👉 Dust collection system for bulk material handling
Dust safety reference:
According to OSHA guidelines on combustible dust safety, proper discharge and dust control devices are essential in bulk material handling systems.
Types of industrial discharge valves
To meet different industrial applications, the industrial discharge valve is available in:
✅ Single-flap valve
✅ Double-flap valve (double dump valve)
✅ Pneumatic flap valve
✅ Electric flap valve
✅ Gravity discharge valve
✅ Heavy-duty airlock discharge valve for coarse materials
✅ High-temperature airlock discharge valve for furnaces/kilns
✅ Gravity discharge valve for fly ash handling
✅ industrial discharge valve for powder feeding systems
✅ Airlock discharge valve for silo discharge and hopper unloading
Working Principle
Material enters the top inlet and rests on the flap plate.
When the flap opens, material discharges smoothly while preventing excessive air intake.
In double-flap valves, the upper and lower plates operate alternately, ensuring:
✅ Airlock and pressure balance
✅ Continuous material discharge
✅ Minimal dust leakage
✅ Stable operation in high-dust environments
This design makes the industrial discharge valve an effective airlock solution for negative-pressure and pneumatic conveying systems, preventing backflow and excessive air intake.
Applications
✅ Silo and hopper discharge systems
✅ Cement, lime, and fly ash processing
✅ Dust collector outlet valves
✅ Pneumatic conveying pipelines
✅ Powder and granule flow control
✅ Chemical, fertilizer, and mineral industries
✅ Food powders, fine powders, micro-particles
✅ Ash handling and industrial waste collection
✅ Cement plant silo and preheater systems
✅ Pneumatic conveying and air gravity conveying systems
Advantages
✅ Strong and durable construction
✅ Low air leakage and dust prevention
✅ Easy to maintain and replace
✅ Suitable for abrasive and fine powders
✅ High airlock efficiency for conveying lines
✅ Long service life in continuous-duty operation
✅ Works in both gravity and pneumatic systems
Related conveying equipment:
👉 Air slide conveyor for powder and cement handling
FAQs About Flap Valve for Bulk Material Handling
Q1: What is a flap valve used for in bulk material handling?
A: A gravity discharge valve is used to control the gravity discharge of bulk materials from silos, hoppers, cyclones, and dust collectors. It allows material to flow smoothly while minimizing air leakage, making it ideal for dust control and bulk material handling systems.
Q2: How does a bulk material discharge valve work?
A: A gravity discharge valve works by allowing material to rest on a hinged flap plate. When the flap opens, material discharges by gravity. In double flap valves, the upper and lower flaps operate alternately to maintain airlock performance and pressure balance.
Q3: What is the difference between a single flap valve and a double flap valve?
A: A single flap valve is suitable for simple gravity discharge applications, while a double flap valve provides better airlock performance. Double flap valves are commonly used in negative-pressure systems, dust collectors, and pneumatic conveying lines.
Q4: Can industrial discharge valve be used in pneumatic conveying systems?
A: Yes. Gravity discharge valves are widely used as discharge and airlock devices in pneumatic conveying and air gravity conveying systems, especially for powders, fly ash, and fine granular materials.
Q5: What materials are flap valves suitable for?
A: flap valve unit is suitable for cement, fly ash, limestone, chemical powders, granules, and other bulk solids. Heavy-duty designs can handle abrasive materials and high-temperature applications when properly selected.
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