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Which hydraulic valves can be uswd at minus 28.6 degree C
Heated ones! sorry couldn't resist. lol
Which fluid do you use at -28.6°C ? Which is its viscosity at this temperature?
Which kind of power do you expect to use for actuation: human? pneumatics?electric?mechanical?
Your question is so formulated that no serious answer can be given but only the above one.
In general before writing a question it is recommendable to ask yourself what the one from whom you expect the answer should know !