Typical for applications are: slow changes in heating demand; high operating pressures and temperatures; safe and reliable operation even under extreme operating conditions is essential; fail-safe function is required; 2-port flanged or threaded valves; 3-position control.

The proposed combinations vary in: control accuracy; plant operating conditions, amount of flow volume.

Stroke valves (20/40 mm stroke) with selectable flow characteristic; fine gradual increments in k_VS values; excellent flow control in heating circuits; VVF53 suitable for operation in PN 25 plants up to 220 °C with medium volumetric flows VVF43 suitable for operation in PN 16 plants up to 220 °C with large volumetric flows offering for different PN classes and control signals.

Links to more information:

- Displayed combination PN 16: VVF43 SKC
- Other suitable actuator above 150 °C: SKB
- For PN 40 use valve VVF61

Stroke threaded valves (5.5 mm stroke) up to k_VS 6.3 suitable for operation in PN 25 plants up to 130 °C with small volumetric flows.

Link to more information:

- Displayed combination: VVG55 SQS