Travel distance of 20 mm or 40 mm
SKB32... SKC32...: Operating voltage AC 230 V, 3-digit control signal
SKB82... SKC82...: Operating voltage AC 24V, 3-digit control signal
The actuator has or does not have a spring reset function
• Adjustable power up to 2800 N
Directly installed on the valve without the need for adjustment
• It has manual adjustment and position indication functions
• Functionality can be enhanced by adding auxiliary switches, potentiometers, valve stem heating elements, and mechanical stroke inverters (only applicable to SKB...)
SK... 82... U has passed UL (American Electrical Quality Standards) certification

Valve actuators for Siemens two-way valve and three-way valve VVF... and VXF... series models, with a driving stroke of 20 mm or 40 mm
Application areas comply with IEC 721-3-3 (International Electrotechnical Commission 721-3-3) 3K5 category
• Environmental temperature: -15 .. +55 °C
• Temperature of the medium inside the valve: -25 .. +220 °C
>220 . 350 ° C: Special extension for valves<0 ° C: Requires the use of stem heating element ASZ6.5

Electric hydraulic actuator, no maintenance required
Open valves through pumps, pressure cylinders, and pistons
Close the valve through spring reset and bypass valve
The actuator complies with German standard DIN 32730, with or without a spring reset function option
• It has manual adjustment and position indication functions
• Installation space for dual position auxiliary switch and potentiometer
If necessary, valve stem heating elements can be used
If necessary, a mechanical stroke inverter can be installed (only applicable to SKB...)

The actuator can be driven by all control systems that are powered by AC 24 V SELV/PELV (SK... 82...) or AC 230 V (SK... 32...) and run with a 3-bit control signal.

There is voltage on Y1: Pump (6) pushes hydraulic oil from reservoir (4) into pressure chamber (5), resulting in stroke: valve stem (10) contracts and valve head (11) opens.
There is voltage on Y2: the bypass valve (8) is open, allowing hydraulic oil to flow back from the pressure chamber (5) to the reservoir (4) through the reset spring (7). The valve stem (10) extends and the valve head (11) closes.
There is no voltage on Y1 or Y2: the actuator and valve remain in the current travel position.

SKB32.51, SKB82.51 (U), SKC32.61, and SKC82.61 (U) actuators have a spring reset feature. If the power is cut off, the bypass valve opens for one second and the spring resets. Spring reset returns the actuator to the "0%" stroke position, closes the valve, and meets the safety requirements of DIN 32730.