Dequn reinforced steel circular flap valve uses a welded face rib/frame on the flap cover and a robust top hinge pin assembly. It is intended for circular outlets where reverse pressure or debris impact demands a stiffer leaf than a light cover.
Technical Specifications
| Product Name | Reinforced Steel Circular Flap Valve |
| Product Category | Fabricated steel circular flap valve |
| Leaf Construction | Steel flap with welded reinforcing ribs / face frame |
| Hinge | Heavy top hinge pin assembly with retaining hardware |
| Mounting | Bolt flange for pipe or wall installation |
| Operation | Automatic open/close by water differential |
| Main Material | Carbon steel (stainless options on request) |
| Coating | Matte anti-corrosion industrial coating |
| Typical Applications | Drainage outlets with higher reverse head or impact risk |
| Customization | Diameter, rib layout, material, coating DFT |
| Quotation Mode | Based on DN / opening and site head conditions |
Core selling points
- Reinforced flap face: Welded ribs improve stiffness under reverse pressure.
- Serviceable hinge: Pin assembly can be inspected and maintained.
- Steel fabrication flexibility: Custom diameters beyond standard cast molds.
- Automatic non-return function: No hoist required for basic outlet control.
- Export coating options: Paint systems can follow destination climate.
Who this product is for
Projects that tried light flap covers and need a stronger circular steel flap for reverse head, wave action, or frequent debris strikes at the outlet.
Compatibility and accessories
- Matching flange and gasket set
- Spare hinge pins and bushings
- Optional stainless hinge parts
- Upstream trash screen for debris-heavy rivers
FAQ
Q1: How is this different from the DN500 cast iron flap valve?
A: This model emphasizes welded steel reinforcement for higher stiffness; the DN500 model is a cast iron series product for standard pipeline sizes.
Q2: Can you build square reinforced flap gates?
A: Yes, square and other shapes are quoted from drawings.
Q3: Does reinforcement eliminate all leakage?
A: No. Reinforcement improves structural stiffness; sealing still depends on face condition and installation.
Q4: What inspection is done before shipping?
A: Hinge movement, flange dimensions, and coating appearance are checked; additional NDT can be added by contract.
Q5: Is stainless steel available?
A: Yes for corrosive or coastal sites when specified.
Q6: How should it be installed?
A: Bolt to a true flange face; ensure the flap swings freely and seats evenly.
Q7: What shortens service life most?
A: Hinge seizure, coating damage, and debris jammed on the seat.
Q8: What to send for a quote?
A: Opening/DN, reverse head estimate, material preference, quantity, destination.
How to inquire
Share outlet diameter, reverse water conditions, and quantity with Export / International Sales. Tel: +86 13903193904.
