| http://www.w3.org/ns/prov#value | - A pumping system in accordance with claim 1 in which said pumphead block includes a pump, the pump including a metal pumphead, a pump chamber having conductive metal walls, a piston and a piston sleeve of low heat conductivity and being substantially non-metallic at locations in contact with the fluid and the walls, said pump chamber being configured so that approximately half the volume of the fl
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