Siemens

About Siemens

Siemens AG is a German industrial and technology group founded in 1847 in Berlin, one of the largest in the world in automation, digitalisation and electrification. With over 300,000 employees and a presence in more than 190 countries, Siemens develops technology solutions for industry, infrastructure, transportation and healthcare. The Siemens Smart Infrastructure division specialises in smart building solutions and distributed energy systems.

In the HVAC and building automation sector, Siemens is a global reference for control valves, actuators and control systems. The range of ball, globe, butterfly and mixing valves, paired with electric and electro-hydraulic actuators, covers every system requirement — from a single fan coil to an urban district heating network.

Siemens products available

Motorised ball valves

Siemens ball valves VAI61 and VBI61 series are designed for on-off isolation of hydraulic circuits in HVAC systems. Available from DN 15 to DN 50, rated PN 16 and PN 25, they provide tight bi-directional shut-off with fast stroke time (10-15 seconds). Ideal for fan coil systems, zone circuits and split units.

Globe valves for modulating control

Siemens globe valves VVF, VXF and VVG series are the optimal solution for modulating flow and temperature control. Available in 2-way and 3-way configurations, from DN 15 to DN 150, with Kvs from 0.25 to 250 m³/h. Linear or equal-percentage flow characteristic ensures precise control on heat exchangers, central plants and air handling units.

Electric and electro-hydraulic actuators

Siemens actuators complete the control system. SAS and SAX (rotary) and SSP (linear) series cover standard applications with on-off, 3-point or modulating control (0-10 V, 4-20 mA). For high differential pressure applications such as district heating substations, SKB and SKC electro-hydraulic actuators deliver closing forces up to 2800 N with silent and reliable operation. BACnet, Modbus and KNX protocol support included.

BMS integration

Valves and actuators with BACnet, Modbus, KNX and LON protocols for direct Building Management System integration.

German reliability

Components designed for over 100,000 operating cycles with minimal maintenance and long operational life.

Complete range

From on-off isolation to precision modulating control, DN 15 to DN 300, PN 6 to PN 25.

Energy efficiency

Precise flow regulation to maximise heat exchanger efficiency and reduce energy consumption.

Application sectors

Siemens valves and actuators are used across multiple contexts: heating and cooling systems in commercial and residential buildings, district heating networks, hospitals, shopping centres, and industrial facilities. High differential pressure versions are ideal for urban district heating, while motorised ball valves are perfect for zone management in civil and industrial climate control systems.

Visit the official Siemens website

Domande frequenti

Which Siemens valves does Roffia supply?

Roffia srl supplies the Siemens HVAC and building automation valve range: motorised ball valves, 2-way and 3-way globe valves, butterfly valves and mixing valves. All models can be paired with Siemens electric and electro-hydraulic actuators. In-stock availability from our Cremona, Italy warehouse, on order if not in stock.

Are Siemens valves suitable for district heating?

Yes. Siemens globe valves VVF and VXF series are designed for high differential pressures (up to 600 kPa) and temperatures up to 200 °C, making them ideal for district heating substations. SKB and SKC electro-hydraulic actuators deliver closing forces up to 2800 N for reliable control even under the most demanding conditions.

Do Siemens valves integrate with building management systems?

Yes. Siemens actuators support all major building automation protocols: BACnet, Modbus, KNX and LON. This enables direct integration with BMS (Building Management System) platforms for centralised monitoring and control of all HVAC circuits, including position feedback and remote diagnostics.