Dequn DN500 cast iron flap valve is a circular non-return outlet gate with embossed DN500 marking. The top-hinged cover opens for outflow and closes against reverse flow, widely used in municipal and irrigation drainage pipelines.
Technical Specifications
| Product Name | DN500 Cast Iron Flap Valve |
| Product Category | Cast iron circular flap valve |
| Nominal Size | DN500 (other DN sizes available in the same series) |
| Main Material | Cast iron |
| Cover Design | Domed circular cover with top hinge |
| Mounting | Base flange with bolt holes |
| Operation | Automatic by water-level difference; no hoist |
| Finish | Protective green industrial coating (batch production finish) |
| Typical Applications | Drainage pipelines, irrigation outlets, municipal discharge points |
| Supply Form | Batch stacks for project quantities |
| Quotation Mode | By DN size and quantity; price on request |
Core selling points
- Clear size identity: DN500 embossed on the cover for easy warehouse and site checking.
- Cast iron durability: Suitable for many sewage and drainage environments when coated correctly.
- Automatic operation: No daily powered drive for basic backflow control.
- Project batch supply: Efficient for multi-outlet drainage contracts.
- Flange installation: Bolt-on to matching pipe flanges or wall fittings.
Who this product is for
Contractors purchasing multiple identical circular outlets—especially DN500—for drainage networks in Africa, Southeast Asia, and other export markets.
Compatibility and accessories
- DN500 mating flange / thimble
- Gaskets and bolt sets
- Hinge pin spares
- Other DN sizes in the same cast iron flap series
FAQ
Q1: Is DN500 the only size?
A: No. DN500 is shown on this model; other DN sizes are available on request.
Q2: Why is the coating green?
A: It is an industrial protective finish used on this batch series. Other colors/systems can be specified.
Q3: Cast iron vs steel flap valve?
A: Cast iron is economical for standard DN sizes. Fabricated steel is better for special diameters or heavier reinforcement.
Q4: Will it work with pressurized force mains?
A: Flap valves are typically for gravity / low-head outlets. Confirm pressure conditions before ordering.
Q5: How many units can you supply per order?
A: Batch production supports project quantities; lead time depends on DN mix and coating.
Q6: What packing is used?
A: Stacked and protected for container shipping; confirm packing photos if required.
Q7: Do you provide installation drawings?
A: Outline mounting guidance and flange interface can be provided with the order.
Q8: What data is required to quote?
A: DN size, quantity, medium, flange standard, and destination.
How to inquire
List DN sizes and quantities for your outlets, plus destination port. Tel: +86 13903193904.
