Static balancing valve Termojet SBV DN15 (Rp 1/2")

Termojet SBV DN15 static balancing valve — a manual device for hydraulic balancing of heating and cooling system circuits. Connection Rp 1/2" (female thread), flow coefficient Kvs 2,56 m³/h at four turns, maximum pressure PN 20 bar. Combines four functions in one body: balancing, presetting, differential pressure measurement via built-in nipples, and shut-off. Body — brass CW617N, EPDM seals.

Technical Specifications

Operating Principle

The valve is installed on the return pipe of the circuit. Rotating the spindle sets the number of turns (0 to 4), which determines the flow cross-section and — accordingly — the flow rate of the heat carrier through the circuit. The built-in measurement nipples allow connecting a differential pressure gauge to measure the actual pressure differential, then calculate the actual flow rate using the valve's Kvs characteristic. The preset position is locked with a special nut — the value will not change with subsequent openings and closings. For service shut-off of the circuit, the valve is fully closed without changing the settings.

Applications

• Balancing risers and circuits in multi-storey buildings. DN15 is the standard size for apartment units and small-capacity branches: precise flow adjustment eliminates the problem of “cold” and “hot” apartments.
• Underfloor heating. The valve is installed on the return manifold of the floor circuit: presetting ensures even distribution of the heat carrier between loops without constant manual adjustment.
• Radiator systems. Balancing individual branches or risers in a two-pipe system — each branch receives the calculated flow rate, and system pressure is stabilised.
• Fan coils and cooling. Rp 1/2" is suitable for connecting small fan coils and chiller circuits — balancing guarantees uniform cooling in all zones.
• Boiler rooms and inlet units. For measuring and balancing small branches from a manifold or boiler room header.

Advantages of Termojet SBV DN15

• Four functions in one body — replaces a separate balancing valve, shut-off valve, and measuring device.
• PN 20 bar — suitable for systems with elevated pressure without additional restrictions.
• Glycol compatibility up to 50% — the valve operates in antifreeze systems without seal replacement.
• Brass CW617N — corrosion and mechanical load resistance at the level of leading European valve manufacturers.
• Preset locking — the set flow rate is retained after each opening of the valve for maintenance.

SBV DN15 and Heat Pump

Heat pumps are most efficient with uniform distribution of low-temperature heat carrier between all system circuits. An unbalanced system means overloaded pumps, uneven heating, and reduced COP. The Termojet SBV DN15 valve allows precise calibration of flow rate in each underfloor heating circuit or fan coil so that the heat pump operates at its design point. More about integrated solutions — on the Termojet heat pumps website.

Frequently Asked Questions

What is the difference between a static and a dynamic balancing valve?
A static valve fixes the set flow rate by mechanical adjustment — it is simple, reliable, and suitable for systems with stable pressure. A dynamic valve automatically maintains a constant flow rate or differential pressure regardless of network changes. For most individual heating systems and small commercial properties, the static SBV DN15 is the optimal solution in terms of price and functionality. See also Balancing Valve SBV DN20 (Rp 3/4") and Balancing Valve SBV DN25 (Rp 1") for larger diameters.

How to correctly measure the flow rate through the valve?
Connect a differential pressure gauge to the valve's measurement nipples and record the pressure differential ΔP. Using the formula Q = Kv × √ΔP (where ΔP is in bar) obtain the actual flow rate. Compare with the calculated value and adjust the number of spindle turns. The procedure takes a few minutes per circuit. See the full range of balancing valves in the Termojet balancing valves — catalogue.