The Siemens VPU115A-135 axial radiator valve is a pressure-independent control valve (PICV) designed for two-pipe heating systems with radiators. Thanks to its integrated differential pressure controller, it provides automatic dynamic balancing and maintains a stable flow rate even when pressure conditions in the system fluctuate. The valve is suitable for both new-build installations and refurbishment of systems with hydraulic problems. It allows presetting of the volumetric flow rate and contributes to quiet operation without disturbing noise. The version with a 1/2" connection and DN 15 is intended for use with cold or hot water and is compatible with thermostatic heads and selected Siemens actuators.