Increasing safety: Combining partial stroke testing and solenoid valve testing

摘要

Many valves are used very rarely in practice, such as safety valves, which only have to open or close in an emergency. Their friction may increase in the course of time, especially the initial break-off force or torque of linear and rotary actuators respectively as a result of corrosion or increasing encrustation of the plug stem. The consequence is that the valves often block when they are required in an emergency situation. This article provides possible solutions to this problem.