Patent ID: 6135724
Filing Date: 2000-10-24
Classification: F04B

Abstract:
A metering pump system comprising:a source of pressurized drive fluid;a plurality of metering pumps including respective drive sections and metering sections, the drive sections being coupled to the source of pressurized fluid, each metering pump including a stationary portion and a movable portion, the movable portion being displaceable with respect to the stationary portion under the influence of the drive fluid to displace a metered fluid from the respective metering section;a plurality of velocity sensor circuits, a velocity sensor circuit being coupled to each metering pump, each velocity sensor circuit generating velocity signals representative of velocity of the movable portion with respect to the stationary portion of a respective metering pump; anda control circuit coupled to the sensor circuits for regulating application of drive fluid from the source to each metering pump drive section based upon the velocity signals.