The Seetru Change Over valve This valve is used if a plant shutdown is impossible or undesirable for process engineering or commercial reasons. With change-over valves it is possible to switch over between parallel safety valves without interrupting operation, so that maintenance work can be carried out on each safety valve in turn. Flanged inlet connections are also available on request. Typically used in the refrigeration industry, however they are used elsewhere and are suitable for wide industrial application.