Typical for applications are: slow changes in heating demand; low pressure drop in the valves; fail-in-place behavior at power failure; 3-position control signal; 3-port flanged or threaded valves; PN 6, 10 or 16 pressure class.

The proposed combinations vary in: control performance; ability for precise selection related to k_VS-values gradual increments; price/performance ratio; PN pressure class; amount of flow volume.

PN16 stroke valves (20/40 mm stroke) with selectable flow characteristic; (also 2-port valves VVG41 and VVF40); fine gradual increments in k_VS-values; excellent flow control in heating circuits with large volumetric flows; robust and easy to service; extended actuator functionality using accessories; offering for different PN classes and control signals.

Links to more information:

- 2-port valves VVG41 VVF40
- Displayed combination threaded: VXG41 SAX
- Displayed combination flanged: VXF40 SAX
- Other suitable actuators: SKD SKB SKC
- For PN6 use valve VXF21; For PN10 use valves VXF31

PN16 stroke valves (5.5 mm stroke); (also 2-port valves VVG44) good flow control in heating circuits with small to medium volumetric flows; compact design; extended actuator functionality using accessories; offering for different control signals.

Links to more information:

- 2-port valve VVG44
- Displayed combination: VXG44 SQS
- Valve & actuator combination for small volumetric flow VXP45  SSC

PN6 flanged slipper valves VBF21; PN 10 3-port externally threaded VBG31 or internally threaded valves VBI31 PN 10 4-port internally threaded valves VCI31 for easy-to-control heating systems with small differential pressures.

Links to more information:

- 3-port valve: externally threaded VBG31
- 3-port valve: internally threaded VBI31
- 4-port valve: internally threaded VCI31
- Slipper valve VBF21
- Displayed combination threaded: VBG31 SQK
- Displayed combination flanged: VBF21  SAL