Air Valves Series 39 | Cla-Val

Cla-Val Series 39 Anti-Slam Air Valves

The Cla-Val Series 39 is a range of anti-slam air valves designed for potable water, raw water, and wastewater pipelines. These valves are specified for filling, draining, and transient conditions where uncontrolled air discharge may result in hydraulic shock or water hammer.

Functions

• Air release during pipeline filling
• Air intake during draining or rapid pressure drop
• Continuous removal of entrapped air under pressure
• Controlled air discharge to mitigate slam and surge events

Applications

• Pumping stations for water supply and sewage
• High points in pipeline profiles
• Lines with frequent pump starts/stops
• Filling and draining mains
• Installations with risk of vacuum formation or hydraulic transients

Selection Criteria

Series 39 is selected where combined air management and transient control are required. Sizing must be based on filling/draining flow rates, operating pressure, hydraulic profile, allowable vacuum, and surge analysis. Material and sealing options should be matched to media compatibility and pressure class (PN10–PN25 typical).

Comparison with Series 36

Series 36 provides basic combined air release and air/vacuum functions. Series 39 incorporates anti-slam features to control closure rate and limit pressure spikes during transient events.

FAQ

Where is it installed?
Near pumps or at pipeline high points.

Suitable media?
Potable water, raw water, and wastewater. Material selection per ISO/EN standards.

Key selection parameters?
Air flow capacity, system pressure, installation location, and transient analysis. Consider maintenance access and leakage risk.