High-capacity, single-chamber automatic air valve with a triple-function design (venting large air volumes during draining, filling, and under pressure conditions). Conforms to AWWA C512 standard, featuring corrosion-resistant stainless steel internals (plastic float for DN 50) and high air-release efficiency up to sonic velocities — suitable for water treatment, distribution, dams, and power plants settings.
DN 50–200 mm
PN 10 / 16 / 25
Compact single-chamber design per AWWA C512
Resilient-seated; Compact single-chamber per AWWA C512
High air-release capacity up to sonic velocity (stabilized floater)
Seats functional down to 5 psi (~0.3 bar)
Ductile cast iron ASTM A536, Grade 65-45-12
Internally and externally epoxy coated (GSK standard)
Large orifice for draining, large orifice for filling, small orifice for operation
Female threaded outlet (DIN ISO 228), flange ends ANSI B16.42 Class 150/300
Inner parts: stainless steel; Float: plastic (DN 50) or stainless steel
EPDM (standard)
Sidewise drainage plug provided
Used in water supply and pipeline systems (both utility and industrial), including water treatment plants, pressure mains, dams, and power generation pipelines.
• Clean water (potable, raw, irrigation)
• Not rated for sewage, oil, or aggressive wastewater
• Effective single-stage design allows compact installation
• High-capacity air discharge with reliable operation at sonic velocity
• Corrosion-resistant inner parts and coating enhance durability
• Optional additional features: inlet gate (DUOJET-S), tamper-proof (DUOJET‑T), anti-surge variants
• Insect protection strainer
• Integrated shut-off gate (DUOJET‑S)
• Anti-surge orifice plate for pressure control (DUOJET Anti‑Surge)
From forging and casting to machining, assembly, and testing — every step is managed under one roof to ensure consistent quality, faster lead times, and zero compromise.
Get in touch with our team for additional information on product pricing, technical data, project support and more.
