KSB is a leading manufacturer of valve and pumps and has numerous locations globally and in the Americas. Its Luxembourg subsidiary, SISTO Armaturen S.A., has launched the new double-acting or single-acting pneumatic actuator from the SISTO-LAP-500 range.
The piston actuator has been designed for valves (globe and gate valves) with a linear stem movement. A technical feature of the new actuator is a double piston in tandem arrangement used for a variant designed for high actuating forces. This means that two pistons are operated along one rod in separate pneumatic chambers. The pistons are fitted with a disc with single-lip profile joint each. The piston rod is sealed by a U-ring and a scraper ring.
The actuators are also available with spring assemblies which move the valves to the defined fail-safe position in the event of a compressed air failure.