Air & Vacuum Valve Series 35 | Cla-Val | Philippopoulos s.a.
Air & Vacuum Valve Series 35 | Cla-Val | Philippopoulos s.a.

Air & Vacuum Valve Series 35 | Cla-Val

Cla-Val Series 35 Air & Vacuum Valve

The Cla-Val Series 35 is an air and vacuum valve designed for water pipelines. It performs two primary functions: rapid evacuation of large air volumes during pipeline filling, and air admission during pipeline draining or vacuum conditions, minimizing the risk of negative pressure development.

Operation

During filling, air is expelled through the large orifice. When water reaches the valve, the float rises and seals the seat. If internal pressure drops, the valve reopens to admit air, preventing vacuum formation.

Technical Data

  • Type: Air & vacuum valve
  • Suitable media: Water
  • Connection: NPT or flanged
  • Standard: ANSI
  • Body material: Cast iron or ductile iron
  • Pressure classes: 125 lbs / 250 lbs
  • Installation: Vertical, on top of pipeline
  • Recommended arrangement: Isolation valve, vented and drained chamber

Applications

  • Potable water distribution networks
  • Irrigation pipelines
  • High points in piping systems
  • Pipelines with elevation changes
  • Filling and draining lines

Limitation

The Series 35 is not intended for continuous release of small air volumes under pressure. For this function, use an air release valve or a combination type.

FAQ

Where is it installed?
At high points or elevation changes in the pipeline.

What does it protect?
The pipeline from vacuum conditions during draining.

What should be checked during selection?
ANSI class, connection type, air flow capacity for filling/draining, and hydraulic profile.

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

Datasheet and documents

Description

The Cla-Val Series 35 Air and Vacuum Valve is designed to perform two separate functions. First, it will allow large quantities of air to be exhausted from the pipeline as it is being filled with water. When this air has been vented completely, water will enter the valve causing the float to seal tightly against the seat to prevent water flow. Second, if the line is being drained, either intentionally or as a result of pipeline breakage, 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.

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