Swing check valves for wastewater applications

The new valves are designed with NBR disc and stainless steel 1.4404 shaft, making them suitable for wastewater containing oils, fats and hydrocarbons, while also providing high corrosion resistance.

The new variants are based on the well-proven AVK swing check valve design.

Key design features

• Full bore for low head loss
• Resilient seat provides a drop tight closure and due to the light weight, it requires a minimum of force to open
• Disc designed with a steel insert fully vulcanized with rubber and a lip seal to ensure tightness
• Shaft fitted in the bonnet allowing for easy maintenance without removing the valve from the pipeline
• Bonnet gasket is securely seated in a precision groove between the bonnet and body and encapsulates the bonnet bolts ensuring sealing integrity and blow-out protection
• 250 μm fusion bonded epoxy coating
• Bosses on each side of the valve seat allow for installation of pressure gauge, by-pass, pressure sensors etc.

Accessories 

• Lever and weight: Enable visual check and the weight is adjustable on the lever to achieve a soft closing against the seat as well as optimum closing speed to prevent water hammer.
• Lever and external spring: Compact solution that does not depend on gravity of the lever’s weight, making it suitable for installations where space is limited. It is the most responsive solution and is often chosen for vertical installations as well as for high pressure conditions, insufficient back pressure and high flow velocities.
• Guard covering lever and weight: Offers safety as it eliminates the risk of injuries and protects against interference with the lever.

Please refer to documentation for more product details: 

• Swing check valve with free shaft end, NBR/1.4404, series 41/60-004
• Swing check valve with enclosed shaft end, NBR/1.4404, series 41/61-004