Wastewater Combination Air Valve type 36WW | Cla-Val

Cla-Val 36WW Combination Air Valve

The Cla-Val 36WW is a combination air valve designed for wastewater pipelines and sewage service. It integrates the functions of the 34WW air release and 35WW air & vacuum valves, providing air release under pressure, large volume air discharge during filling, and air intake during pipeline draining or vacuum conditions.

Operation

During pipeline filling, the valve expels air through a large orifice. In steady-state operation, it continuously releases small amounts of entrapped air. In the event of pressure drop or vacuum, it allows air entry to prevent negative pressure and potential pipeline collapse.

Applications

• Pressurized wastewater mains
• Sewage pumping stations
• High points in pressurized networks
• Filling and draining lines
• Pipelines conveying gases, odors, or suspended solids

Selection Criteria

The 36WW is specified when all three air management functions are required in a single assembly. Sizing is based on filling/draining flow rates, operating pressure, hydraulic profile, risk of vacuum, and accessibility for maintenance. Material selection should consider media compatibility and solids content. Typical pressure classes: PN10/16. Sealing options: EPDM, NBR. Flanged or threaded connections available.

FAQ

How does it differ from the 34WW?
The 34WW is primarily for air release under pressure and does not provide vacuum protection.

How does it differ from the 35WW?
The 35WW handles filling/draining air flows but does not continuously release small air volumes during operation.

What maintenance is required?
Periodic inspection of the float, seat, chamber, and removal of solids or debris from wastewater is necessary to ensure reliable operation.