Premium Air Valves for Global Waterworks

At Metalsin, we provide a full spectrum of high-performance air valves engineered for the most demanding water system environments. Whether you are managing potable water supply, wastewater treatment, or reclaimed water transmission, our products are designed to ensure pipeline integrity and operational efficiency. We specialize in manufacturing valves that meet and exceed rigorous international standards, offering customized solutions tailored to your specific project requirements.

Core Functions: Advanced Air Management

Metalsin‘s air valves ensure total system stability by performing three essential functions: air release function– rapidly exhausting large air volumes during filling to prevent flow-obstructing pockets; air intake function – automatically admitting air during drainage or pump failure to provide critical vacuum relief against pipe collapse; and air venting function – continuously purging micro-bubbles under full operational pressure to maintain peak flow efficiency and minimize friction.

Various air valves supplied by Metalsin.

Proper air management is essential for pipeline stability. Air valves are categorized by their mechanical operation to address specific air-related challenges in a piping system:

• Air-Release/ Air-Venting Valves (venting function): These hydromechanical devices are designed to automatically release small pockets of air to the atmosphere as they accumulate at local high points while the system is full and operating under pressure. By purging these micro-bubbles, the valve prevents air locks and maintains optimal flow velocity.
• Air/Vacuum Valves (release & intake function): A direct-acting, float-operated device designed to automatically release or admit large volumes of air during the filling or draining of a water pipeline. These valves open to relieve negative pressures (vacuum relief) and protect the pipe from collapse. Crucially, they remain closed and will not reopen to vent air once the system is full and under pressure.
• Combination Air Valves (triple function): Our most versatile solution, this device incorporates the features of both an air-release valve and an air/vacuum valve. It handles large volume exhaust during filling, large volume intake during draining, and continuous venting of small air pockets during pressurized operation—providing total protection in a single unit.

Global Standard Compliance & Material Classification

Metalsin air valves are manufactured to align with the world’s most recognized engineering specifications, ensuring seamless integration into international tenders and municipal projects: AWWA C512, EN 1074-4, AS 4956, GB/T 36523, CJ/T 217, JWWA B 137.

To ensure our air valves withstand harsh environments and meet stringent health codes, we offer a diverse range of premium materials: FBE-coated ductile iron for standard municipal waterworks, stainless steel for high-salinity industrial use, and lightweight plastic/composites for low-pressure irrigation. For the most aggressive conditions like offshore platforms, we provide aluminum bronze with exceptional chloride resistance, while brass remains our cost-effective choice for residential and HVAC applications. Regardless of the body material, all models are equipped with high-grade SS304/316 floats and WRAS/NSF compliant EPDM seals to guarantee long-term, leak-free performance.

Critical Applications in Water Systems

Integrating Metalsin air valves into your pipeline design provides vital structural and operational benefits: they offer critical vacuum protection by admitting air during sudden pressure drops to prevent pipe collapse, and utilize specialized non-slam designs to mitigate surges and cushion pressure spikes against pumps and joints. Furthermore, by eliminating air-induced friction, our valves can improve energy efficiency—reducing pumping consumption by up to 10%—while ensuring meter accuracy by removing air upstream of flowmeters to prevent billing errors for water utilities.