Swing & Dual-Plate Check Valve
Swing and dual-plate check valve with a ductile-iron body that stops water flowing back in drinking-water, irrigation and industrial lines; to EN 12334, in the most-used sizes from DN50 to DN600.
- Lets flow pass in one direction only and stops backflow
- Protects pumps and line equipment from reverse flow
- Two types: swing and dual-plate
- Ductile-iron body, to EN 12334
- Most-used sizes DN50 to DN600; state the size and type in your inquiry
Key Specifications
- Product code
- P112
- Reference standard
- EN 12334
- Material & grade
- Ductile iron
- Nominal diameter
- DN50 to DN600
- Unit of sale
- Piece
- Applications
- Drinking water supply, Irrigation & agriculture, Industrial
- Dimensional options
- 14 rows in the specification table
What a check valve is and why it is needed
A check valve lets flow pass in one direction only, without anyone operating it. While water moves the right way, its pressure holds the flap or plates open; when the flow stops or tries to reverse, the valve closes.
It is usually installed after a pump, so that when the pump stops the water column does not run back into it. It is also used in drinking-water mains, irrigation networks and industrial plants wherever the direction of flow must stay fixed. The body is ductile iron, and EN 12334 is the standard for cast-iron check valves.
Swing versus dual-plate check valves
In a swing check valve, a flap hinged at the top swings open under the flow and drops back onto its seat when the flow reverses, closing the line. The design is simple and common on water lines.
In a dual-plate check valve, two half-plates on a central hinge pin replace the single flap and are held closed by a spring. This type has a shorter, lighter body and is installed between two line flanges. The choice depends on the installation space and the line conditions, and we advise on it before you buy.
Check valve sizes and how to order
Swing and dual-plate check valves are supplied in the most-used sizes of DN50, DN65, DN80, DN100, DN125, DN150, DN200, DN250, DN300, DN350, DN400, DN450, DN500 and DN600.
For a current price, add the size (DN), swing or dual-plate type, the pressure class you need and the quantity to the inquiry list on this site, or call us. We issue an official invoice and ship to other cities as well.
Swing & Dual-Plate Check Valve — Technical Specifications
Wall thickness and weight are calculated from the standard series and are approximate; final values are confirmed in the quotation.
| Nominal Diameter |
|---|
| DN50 |
| DN65 |
| DN80 |
| DN100 |
| DN125 |
| DN150 |
| DN200 |
| DN250 |
| DN300 |
| DN350 |
| DN400 |
| DN450 |
| DN500 |
| DN600 |
Swing & Dual-Plate Check Valve — FAQ
Where is a check valve installed?
Mostly after a pump, so water does not run back into it when it stops, and anywhere else on the line where the flow direction must stay fixed.
What is the difference between swing and dual-plate check valves?
A swing valve has a single hinged flap, while a dual-plate valve has two spring-loaded half-plates and a shorter, lighter body.
Does a check valve need to be operated?
No. A check valve works on its own, opening and closing with the direction of flow.
Which check valve sizes are supplied?
The most-used sizes from DN50 to DN600, in swing and dual-plate types.
