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.
