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Looks like it's just their to isolate one part of a circuit from another and this is the pressure transfer point. There is probably a piston connected to that shaft you see at the bottom. With the piston there, it could also limit movement. So one side is connected to the pump and the other side is connected to the ram that operates one of the linkages. Pump could lose pressure or blow out, but the ram would stop when the piston tops out.
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