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The Danfoss ASV-PV 4G DN 32 is an automatic balancing valve for the return pipework of two-pipe heating systems. It controls the differential pressure in the riser and ensures stable balancing. Δp range 5–25 kPa, PN 16. More information
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| Connection size | G 1 1/2" |
| Connection Type | External thread |
| Flow | 6.3 m3/h |
| Measuring nipples | No |
| Nominal diameter | DN 32 |
| Pressure | PN 16 |
| Temperature | 120 °C |
| Weight | 3.43 kg |
Danfoss ASV-PV 4G DN 32 is an automatic balancing valve – differential pressure controller designed for installation in the return pipework of two-pipe heating systems. It maintains a constant differential pressure across a riser or apartment unit regardless of the current system load, thereby ensuring stable hydronic balancing at both full and partial load.
The ASV-PV 4G is intended for two-pipe hot-water heating systems in residential and office buildings, particularly where radiators with pre-settable thermostatic valves or underfloor heating manifolds are used as terminal units. The valve is installed in the return pipework of each riser or apartment unit and, together with a partner valve (ASV-BD or ASV-M) in the flow pipework, forms a pressure-independent control zone. Thanks to its compact installation dimensions, it is also suitable for space-restricted installations, for example in recessed cabinets for underfloor heating manifolds.
The ASV-PV is a diaphragm differential pressure controller. Pressure from the return pipe acts on the lower side of the control diaphragm, while pressure from the flow pipe, conveyed via an impulse tube, acts on the upper side. The valve continuously balances the pressure difference and keeps the set Δp constant. The differential pressure is set by turning the adjustment scale without tools and can be secured with a locking ring to prevent unauthorised adjustment. The factory setting for the 5–25 kPa range is 10 kPa. The valve has integrated shut-off, draining and system flushing functions.
Technical parameters (DN 15, item no. 003Z5511):
The ASV-PV always operates together with a partner valve (ASV-BD or ASV-M), which is installed in the flow pipework. The two valves are connected by the impulse tube supplied in the package. Differential pressure control cannot be ensured without the partner valve, as it provides the reference pressure for the ASV-PV diaphragm.
The Δp setting is adjusted by turning the adjustment scale without tools – clockwise increases the value, anticlockwise decreases it. The valve is factory-set to 10 kPa (range 5–25 kPa). After setting, the scale can be secured with a locking ring to prevent accidental or unauthorised adjustment. The shut-off function is structurally separate from the adjustment mechanism, so shutting off the system does not affect the setting.
Yes, the ASV-PV is also suitable for underfloor heating. The valve is installed on the return side upstream of the manifold and ensures a constant differential pressure for the entire manifold. Its compact installation dimensions allow it to be fitted directly into the manifold’s recessed cabinet. The flow in the individual circuits is then limited by adjusting the manifold itself or the ASV-BD partner valve.
Flushing is carried out using the optional flushing accessory (item no. 003Z7850), which is fitted onto the valve spring guide in place of the shut-off handle. The accessory is turned fully clockwise and the system is flushed in the direction of the arrow on the valve body. Before flushing begins, the system must be filled with water so that the differential pressure does not exceed 5 bar.
The ASV-PV valve is also available in a version with an EPP insulation cover. The insulation is designed for operating temperatures up to 120 °C and is fitted by simply clipping it on without tools. Both insulation materials used in the ASV range (EPS and EPP) meet the requirements of fire classification B2 according to DIN 4102.
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