| 摘要 |
<p>RECIPROCABLE PUMP WITH VARIABLE SPEED DRIVE : A reciprocable liquid pump driven by a direct current electric motor wherein the motor drive voltage, and thereby pump reciprocation, and output pressure, is selectively controlled by a circuit including an electromechanical transducer coupled in pressure sensing relation to the liquid pump output, a manually operable pressure set point switch, and a silicon-controlled rectifier circuit.</p> |
