Wastewater Air & Vacuum Valve type 35WW | Cla-Val | Philippopoulos s.a.
Wastewater Air & Vacuum Valve type 35WW | Cla-Val | Philippopoulos s.a.

Wastewater Air & Vacuum Valve type 35WW | Cla-Val

Cla-Val 35WW Air & Vacuum Valve for Wastewater

The Cla-Val 35WW is an air and vacuum valve designed for wastewater pipelines. It enables rapid expulsion of large air volumes during pipeline filling and allows air intake during draining, preventing negative pressure (vacuum) conditions that could compromise pipeline integrity.

Operation

During filling, air is discharged through a large orifice. When liquid reaches the valve, the float rises and seals the seat. In the event of pressure drop or pipeline draining, the valve opens to admit air, equalizing internal and external pressures.

Technical Data

  • Media: Wastewater, sewage
  • Connection: NPT or flanged
  • Standard: ANSI
  • Body: ASTM A536 ductile iron
  • Pressure class: 125 lbs / 250 lbs
  • Installation: Vertical, at the pipeline high point
  • Recommended: Isolation valve, ventilated and drained chamber

Applications

  • Pressurized wastewater force mains
  • Pipeline slope transitions
  • High points in pressurized sewer networks
  • Pipeline filling and draining points
  • Lines requiring vacuum collapse protection

Limitation

The 35WW is not intended for continuous air release of small air volumes under pressure. For this function, use an air release valve (e.g., Cla-Val 34WW) or a combination unit, depending on the hydraulic profile.

FAQ

Where is it installed?
At pipeline high points or slope changes.

What does it protect?
Prevents pipeline vacuum during draining or rapid flow changes.

What should be considered in selection?
ANSI class, connection type, air flow capacity for filling/draining, and maintenance access.

Standard (Options)
  • ANSI
Connection (Options)
  • NPT
  • Flanged
Material (Options)
  • ASTM A536 Ductile Iron
Pressure Rating (Options)
  • 125 lbs
  • 250 lbs

Datasheet and documents

Description

The Cla-Val 35WW Series Air and Vacuum Valve is designed to perform two separate functions in a sewage or wastewater system. First, it will allow large quantities of air to be exhausted from the pipeline as it is being filled. When this air has been vented completely, the liquid will enter the valve causing the float to seal tightly against the seat. Second, if the line is being drained, the valve responds to the loss in pressure and opens. This allows air to re-enter the pipeline and prevents a potentially damaging vacuum from developing.

35WW Series Air and Vacuum Valves should be installed at high points or at grade changes within the pipeline. Mount the unit in the vertical position on top of the pipeline with the isolation valve below each valve in the event servicing is required. A vault with adequate venting and drainage should also be provided.