Coliter ® Brass Air Release Valve, 1.6MPa, -20–120°C, Automatic Air Vent, BSP Threaded
PQ1008 Brass Air Release Valve – Automatic Air Vent for Heating and Closed-Loop Water Systems
The Coliter® PQ1008 Brass Air Release Valve is an automatic air vent designed to continuously remove trapped air from heating, solar thermal, and closed-loop water systems—preventing airlocks, noise, reduced efficiency, and corrosion. Constructed from high-quality lead-free brass (<0.25% pb="">1.6 MPa and operating temperatures from -20°C to 120°C, it is suitable for residential and commercial hydronic applications. The valve has ISO 228 (BSP parallel) threads in sizes DN15 (G1/2"), DN20 (G3/4"), and DN25 (G1"), with compact overall lengths of approximately 69.5 mm (DN15/DN25) and 68.5 mm (DN20). Essential for maintaining system performance, longevity, and quiet operation.
Installation diagram
Product Description
| DN | G | D |
| 15 | 1/2" | 69.5 |
| 20 | 3/4" | 68.5 |
| 25 | 1" | 69.5 |
Technical Specifications
Nominal Pressure: 1.6 MPa
Working Medium: Water、Non-corrosive Liquid
Working Temperature: -20℃ ≤ t ≤ 120℃
Pipe Threads: ISO 228
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Faq - Frequent questions
Introduction to Air Vent Valve
Coliter® provides reliable air vent valves to automatically or manually release trapped air from heating, solar, and closed-loop water systems—preventing airlocks, noise, and reduced efficiency. The series includes the PQ1008 automatic air release valve with float-actuated mechanism for continuous deaeration, and manual air vents (e.g., PQ1007) for periodic maintenance in radiators and manifolds. Constructed from high-quality brass with lead-free compliance (<0.25% Pb) rated for PN16 (1.6 MPa) and temperatures up to 120°C, all models feature G1/2" or G3/4" ISO 228 threads and comply with plumbing standards for potable water contact. Essential for system longevity and optimal thermal performance in residential and commercial installations.
