Swing Check valve With Counterweight
Keylion® Swing Check valve With Counterweight, frequently referred to in the industry as a lever and weight non-return valve, functions as a heavy-duty backflow prevention device for pressurized systems. The operating logic relies on the forward kinetic energy of the media to lift the disc, while the external counterweight utilizes gravity to pull the disc back to the seat the moment flow velocity drops. You will primarily find these installed in large-scale irrigation networks, desalination plants, and industrial cooling water loops. Its primary job is to handle the harsh surges that occur when heavy-duty pumps trip or cycle off unexpectedly.
Technical Specification
| Product Name | Swing Check valve With Counterweight |
| Brand | Keylion® |
| Size Range | DN50 - DN600 (2" - 24") |
| Pressure Rating | 300PSI/PN16 |
| Body & Bonnet | Ductile Iron GGG50 |
| Disc (Core) | Ductile Iron+EPDM/NBR |
| Stem / Shaft | Stainless Steel 2Cr13 / SS304 |
| Coating Type | Fusion Bonded Epoxy (FBE) |
| Working Temp. | 0°C to 80°C |
FAQ
Q:Why does a Swing Check Valve with Lever and Weight even need that external arm?
It's mainly for dampening and safety. The weight helps the disc shut faster and more smoothly before backflow hits full speed, which kills the water hammer that ruins pumps. Plus, it's a great visual indicator-you can see the valve's internal position from a distance just by looking at the lever's angle.
Q:Can I install this Lever and Weight NRV in a vertical pipe?
Yes, you can, but only for upward flow. You need gravity working with the weight to pull the disc back to the seat. If you're going vertical, let us know your pipeline pressure so we can make sure the weight is balanced correctly to avoid the disc chattering or staying stuck open.
Q:How do I actually adjust the weight to stop the pipe from banging?
It's a simple trial-and-error process on-site. If your Swing Check Valve with Lever and Weight slams too hard when the pump trips, try sliding the blue disc further out toward the end of the lever. This increases the closing torque. You want to find that "sweet spot" where the valve shuts right as the flow stops but before the water reverses direction.
Hot Tags: swing check valve with counterweight, China swing check valve with counterweight manufacturers, suppliers, factory, a one way valve, Cast Iron Silent Check Valve, check valve dn50, check valve strainer, quick check valve, union check valve
