COMBINATION AIR RELEASE VALVE

Automatic Air Release & Vacuum Protection

IO Valves Combination Air Release Valves are designed to automatically release large volumes of air during pipeline filling and admit air during pipeline draining, while also releasing accumulated air during normal pipeline operation. This triple-function performance ensures efficient pipeline operation and protects the system from vacuum conditions, surge, and water hammer.

Key Features

• Triple function operation enabling large air release, air admission, and continuous air release during operation

• Anti-shock / non-slam design to minimize water hammer during air discharge

• Float-operated mechanism ensuring fully automatic operation without external power

• Stainless steel float (SS 304/SS 316) for corrosion resistance & long service life

• Full-bore valve body allowing unrestricted airflow and efficient system performance

• Stainless steel anti-insect screen for reliable and maintenance-free operation

• Precision-machined seating for dependable sealing and leak-free performance

Performance Characteristics

• Minimum Sealing Pressure: 0.2 bar

• Water Tightness: 100% leak‑tight

• Operating Mode: Automatic, float‑operated

• Installation: Vertical (pipeline high points)

Pressure Rating PN 10/PN 16/PN 25

Size Range DN40 – DN 300

Design & Testing Standards

• Design Standard: EN 1074‑4

• Flange Drilling: EN 1092‑2

• Testing: EN 12266‑1

• Operating Temperature: 0 °C to +80 °C

Material of Construction

Body & Bonnet : Ductile Iron GGG 50

Float : Stainless Steel SS 304 (SS 316 optional)

Disc : Stainless Steel SS 304

Guide Rod : Brass

Bushing : Stainless Steel SS 304

O‑Rings : NBR

Dust Screen & Cover : Stainless Steel SS 304

Fasteners : Stainless Steel SS 304

Coating : Fusion Bonded Epoxy Coating ≥ 250 μm

Triple Functions

Release of large quantities of air During filling, the line will be ventilated via the large orifice with big volume

Entrance of large volumes of air During pipeline, drainage bring in large volume air to avoid negative pressure

Closure

After ventilation the valve closes automatically

Release of small quantities of air

During operation of a line, ventilation is carried out via the top small orifice

Typical Applications

High Geometrical Points

Ascending Segment

Negative Slope Change

Pumping Station

High Performance Triple Function Air Valve (TFAV)

Dual Function Air Valves