Coliter ® Angle Return Valve – 1.0 MPa, 0–100°C, for Hydronic Heating Systems
NQ3002 Angle Return Valve – Brass Manual Balancing Valve for Radiator and Underfloor Heating Circuits
The Coliter® NQ3002 Angle Return Valve is a high-quality brass return valve designed for precise flow balancing and isolation in hydronic radiator and underfloor heating systems. Featuring an angle configuration, it allows flexible pipe routing in tight spaces while maintaining optimal hydraulic performance. Constructed from forged lead-free brass, it includes a manual handwheel for smooth, accurate flow adjustment and full shut-off capability. Rated for a nominal pressure of 1.0 MPa and operating temperatures from 0°C to 100°C, it ensures reliable, leak-free service over long periods. The valve complies with ISO 228 (BSP parallel) threading standards and is available in two standard sizes: DN15 (G1/2") and <DN20 (G3/4"). Compatible with common radiator tails and manifold connections, the NQ3002 supports efficient heat distribution, easy system commissioning, and maintenance—making it ideal for residential and light commercial heating applications.
Installation diagram
Product Description
| DN | G | L | H |
| 15 | G1/2" | 49 | 43.5 |
| 20 | G3/4" | 52.5 | 48.5 |
Technical Specifications
Nominal Pressure: 1.0 MPa
Working Medium: Water
Working Temperature: 0℃ ≤ t ≤ 100℃
Pipe Threads: ISO 228
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Faq - Frequent questions
Introduction to Return Valve
Coliter®’s return valves are essential components for balancing and isolating return lines in hydronic radiator and underfloor heating systems. The series includes the NQ3001 straight return valve, NQ3002 angle return valve, and NQ3008 straight return valve with drain function—all featuring high-quality brass construction, PV10 (1.0 MPa) pressure rating, and operating temperatures up to 110°C. Designed with manual handwheels for precise flow adjustment and full shut-off, they enable system balancing, maintenance isolation, and easy air venting or drainage (on NQ3008). Compatible with standard radiator tails and manifold connections, these valves ensure efficient heat distribution, leak-free performance, and long-term reliability in residential and commercial heating installations.
