| 摘要 |
A fluid delivery system is operative to deliver a high viscosity and/or a highly abrasive fluid at a preselected pressure. The system does not incorporate any pressure regulator disposed in contact with the pressurized fluid. The system includes a fluid supply which retains and dispenses a fluid, a source of compressed gas, a fluid delivery line, and a ratio pump which is in fluid communication with the fluid supply, the source of compressed gas and the fluid delivery line. The ratio pump is operable, when energized by a compressed gas, to pump fluid from the fluid supply through the fluid delivery line at a high pressure which is proportional to the pressure of the compressed gas supplied to the pump. The system includes a pressure transducer disposed so as to sense the pressure of the fluid in the fluid delivery line and supply a control signal corresponding to that measured pressure. The control signal is supplied to a load controller which in turn regulates the source of compressed gas in response to the measured pressure in the fluid delivery line so that the pressure of the compressed gas delivered from the source is proportional to the pressure of the fluid in the fluid delivery line. In this manner, a feedback loop is established which maintains the pressure of the fluid in the fluid delivery line at a preselected level. Also disclosed are methods for the use of the system.
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