AMOT Controls temperature control valves have been chosen for fitting to a series of SNCF trains on the French railway in the first phase of a project with an option for further locomotives, which could bring the total to 2000 valves. Key feature in the specification was the manual override designed into AMOT ‘B’ internally sensed temperature valves, allowing manual operation and meeting the requirement for manual valve operation without any tools in the event of complication. Also quoted as offering a more economic solution for controlling high and low temperature circuits on MAN diesel engines, the valves used are of 50mm and 80mm nominal bore. Self-contained with no need for external power source, the self-sensing temperature control is accomplished by expansion of a wax/copper mixture with positive proportional valve action. A leak-tight design eliminates external moving parts and external dynamic seals. Another feature was replaceable seats and sleeves.
