How to operate valves absolutely fail-safe without a power supply or control system Water guided pipelines for long distances for example in turbine feeding lines, water transmission lines from dams to water treatment plants and/or outlets of water reservoirs, require an absolute failsafe closing function of control valves (e.g. butterfly valves, ball valves & needle valves). These valves are mostly located in remote areas where there is no electrical power and/or control circuit available. With a so called weight-loaded hydraulic actuating system and a connected mechanical detecting system this function can be realised perfectly. Author: Gunter Oxler. ...

Process control valve operation under shut-down conditions If we consider a process installation – for example a water treatment plant, refinery, sugar processing plant and so on – we face problems if there should be, for any reason, a failure in the power supply. This article by Gunter Oxler looks at some current technologies and where we need to take care by designing and selecting the appropriate technology....

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