| 摘要 |
A pump drive system (10) for pumping high temperature fluid includes a fluid pump (12) defined by a housing. The pump includes a fluid piston (16) for developing an impulse for pumping the fluid through the system (18). A fluid column (24) is included that is in fluid communication with the high temperature fluid system (20) and the piston (16) of the pump. The fluid column includes valves 54, 56 for introducing and exhausting fluid from the column during the pumping stroke of the plunger. During operation of the pump, high temperature fluid is introduced in the fluid column through the valves, mixed with the fluid within the column and pumped through the valve into the fluid system thereby pumping the fluid while maintaining the temperature adjacent to the fluid piston at a reduced level to insure lubrication of the piston packing (52) while preventing deterioration.
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