Description

A swing check valve is mounted with a disc that swings on a hinge or shaft. The disc swings off the seat to allow forward flow and when the flow is stopped, the disc swings back onto the seat to block reverse flow. The weight of the disc and the return flow has an impact on the shut-off characteristics of the valve.

Often a lever and weight or a lever and spring are mounted to achieve optimum performance. Swing check valves with lever and weight are appropriate for installations with an increased risk of water hammer at standard velocities. Swing check valves with lever and external spring are suitable for high pressure, insufficient back pressure and high flow velocities.

An important thing to be aware of when installing a swing check valve is, that it is not completely maintenance free since the disc needs to be cleaned once in a while. Furthermore, a lever is often mounted to enable visual check. Therefore, swing check valves are often installed where personnel is present.

Bonnet/disc design gives easy access to maintenance
Disc with steel insert is fully vulcanized with EPDM rubber (up to DN 300) ensuring optimum sealing ability
Lip sealing on the disc ensures tightness
Light-weight disc requires a minimum of force to open and close the valve
The disc is able to move slightly both horisontally and vertically to close completely tight
Hinge tightened around the shaft with bolts to eliminate play and thus ensure durability
Full bore ensures low head loss
Ductile iron with epoxy coating in compliance with DIN 3476 part 1 and EN 14901