| 摘要 |
PROBLEM TO BE SOLVED: To provide a pump device that may reliably and cost-effectively deliver viscous medium having a high solid component at high pressures of ≥200 bar and high temperatures of ≥300°C.SOLUTION: In a pump device provided with a first diaphragm pump head which has two or an integral multiple of two fluid conveyance spaces and diaphragms belonging to the fluid conveyance spaces and which is hydraulically coupled to a second pump head for driving the first diaphragm pump head, the second pump head has two additional fluid conveyance spaces and additional associated diaphragms, which are drivable by a double-acting piston via associated diaphragm control spaces. A refilling valve is connected to each of the diaphragm control spaces and a diaphragm control pressure greater than atmospheric pressure is temporarily applied to the diaphragm control spaces, when using the refilling valve. |
