Double Orifice Air Valve – China Manufacturer & Supplier

Premium Quality Double Orifice Air Valves from China

As a professional China double orifice air valve manufacturer, Yuanjd Valve specializes in the design, production, and supply of high-performance double orifice air valves—also known as dual orifice air release valves or combination air valves—for a wide range of pipeline applications. Our double orifice air valves are engineered to serve as the complete “respirator” of piping systems , combining the functions of both a large-orifice air/vacuum valve and a small-orifice air release valve in a single, compact unit.

Triple Function Design

The double orifice air valve performs three essential functions to protect pipeline systems throughout their entire lifecycle:

1. Large-volume air discharge – During pipeline filling, the large orifice allows a high flow rate of air to escape rapidly, ensuring efficient filling and preventing air pockets.

2. Large-volume air intake – During pipeline draining or when negative pressure occurs, the large orifice admits air to break the vacuum and prevent pipeline collapse.

3. Continuous air bleeding – During normal operation under pressure, the small orifice automatically releases accumulated air that collects at high points, maintaining system efficiency.

Double Orifice vs Single Orifice Air Valve

Technical Specifications

Our double orifice air valves are manufactured in strict accordance with leading international standards:

• Design Standards: AWWA C512, EN 1074-4

• Testing: EN 12266-1, API 598

• Flange Standards: EN 1092-2, BS 4504, ANSI B16.1

• Size Range: DN50 to DN300 (NPS 2″ to 12″)

• Pressure Rating: PN10, PN16, PN25 (Class 125/150/300 available)

• Temperature Range: 0°C to 80°C

• Body Materials: Ductile iron (GJS-500-7), cast iron

• Float Materials: ABS plastic (standard) or stainless steel 304/316 (upon request)

• Sealing: EPDM rubber or NBR

• Coating: Fusion-bonded epoxy coating, 250-300 micron thick

Key Design Features

• Aerokinetic design – Allows air to rush out at high speed without forcing the float upward and closing prematurely; the valve closes only after all air has left the system

• Non-clogging design – Eliminates the need for backwashing

• Stainless steel internal trim – 316 stainless steel floats and components for superior corrosion resistance

• Resilient seating – Ensures positive shutoff even at low pressures

• Compact, lightweight construction – Easy installation and maintenance

Applications & Industries

Double orifice air valves are the preferred choice for critical pipeline applications:

• Water Transmission Pipelines – Long-distance water mains, distribution networks

• Wastewater & Sewage Force Mains – Pumping stations, treatment plants

• Irrigation Systems – Agricultural and landscape irrigation networks

• Industrial Processing – Chemical, petrochemical, and manufacturing fluid systems

• Power Generation – Cooling water systems, condensate lines

• Fire Protection Systems – Fire main air management

Why Choose Yuanjd Valve as Your China Double Orifice Air Valve Manufacturer?

At Yuanjd Valve, we combine decades of manufacturing expertise with advanced production facilities and rigorous quality control systems. As a leading China double orifice air valve supplier, we are committed to delivering products that meet international quality standards—including AWWA C512 and EN 1074-4—while offering competitive factory-direct pricing.

China remains the world’s leading manufacturer of air valves, with specialized manufacturing clusters offering unrivaled advantages in cost, scale, and technological advancement. Yuanjd Valve leverages this ecosystem to provide our global clients with high-quality double orifice air valves at competitive prices, backed by reliable delivery and responsive after-sales support.

Our double orifice air valves feature:

• AWWA C512 & EN 1074-4 compliant design

• Triple function – rapid air release, vacuum admission, and continuous air bleed

• ABS or stainless steel floats – flexible options for different media

• Fusion-bonded epoxy coating for enhanced durability

• ISO 9001:2015 certification – Quality management systems

• CE marking – Compliance with European market requirements

OEM & Customization Services

We offer comprehensive OEM and customization services, allowing you to specify materials, sizes, pressure ratings, end connections, float materials, and certifications that precisely match your industrial requirements. Whether you need ductile iron or stainless steel bodies, ABS or stainless steel floats, flanged or threaded connections—our engineering team can deliver tailored solutions for your specific project needs.

Contact Us

Partner with a reliable double orifice air valve manufacturer in China. Contact Yuanjd Valve today for product inquiries, technical support, or to request a quote. Our experienced team is ready to assist you with professional guidance and prompt service.