Sizing Chart for Small Orifice Air Valve

Why Sizing Matters

• Effective air removal – preventing air pockets, flow interruptions, and noisy operation.
• System protection – reducing surges, water hammer, and pump damage.
• Efficiency – keeping pumps and pipelines working at their designed capacity.
• Cost optimisation – balancing valve size, performance, and budget.

Factors That Influence Sizing

 When determining the right small orifice air valve size, consider:

• Pipeline Diameter – Larger pipes may require multiple valves at high points.
• Operating Pressure – Higher pressures release more dissolved air into the system.
• Flow Rate – Impacts how quickly air accumulates and must be vented.
• Installation Point – Location (pump discharge, high point, rising main) affects venting needs.

Example Sizing Chart for Small Orifice Air Valves

 Note: This chart is illustrative. Always check manufacturer data for precise capacity and sizing.

Sizing Guidelines

• Use manufacturer flow/air capacity tables to confirm suitability.
• Multiple smaller valves at strategic points often work better than one oversized valve.
• Critical mains (long rising or large diameter) may require a mix of small orifice and combination valves.
• Consult design standards (AWWA, BS/EN) for project-specific requirements.

Summary

A sizing chart for small orifice air valves is an essential tool for selecting the right valve for your pipeline. Proper sizing ensures efficient air removal, protects your pumps and fittings, and avoids unnecessary costs.

 When in doubt, consult both manufacturer data and system design parameters to verify the best match for your project.