Patent ID: 9605664
Date: 2017-03-28
CPC Classifications: F04B

Claim:
1. Apparatus comprising: a piston pump including a motor and a plunger, wherein the motor is configured to drive linear reciprocating motion of the plunger in response to being supplied with a flow of compressed fluid; a metering valve fluidly coupled to the motor, the metering valve being configured to control the flow of compressed fluid to the motor; a purge valve fluidly coupled between the metering valve and the motor; a linear encoder coupled to the piston pump, the linear encoder configured to generate sensor data indicative of a position of the plunger; an electronic controller operatively coupled to the metering valve, the purge valve, and the linear encoder, wherein the electronic controller is configured to receive sensor data from the linear encoder and to control the metering valve and the purge valve; and a pressure sensor fluidly coupled to an outlet of the piston pump and operatively coupled to the electronic controller, the pressure sensor configured to generate pressure data indicative of a pressure of the fluid media pumped by the piston pump, wherein the electronic controller is configured to determine that the linear reciprocating motion of the plunger has stopped when the pressure data indicates that the pressure of the fluid media has reached a threshold value.