Patent ID: 6109030
Filing Date: 2000-08-29
Classification: E02F,F04B,F15B

Abstract:
A ganged pumping apparatus, comprising:first and second open circuit pumps having respective output lines joined by a common line connected to a load, each of the pumps having a respective standby condition of minimum steady state displacement;a first load sensing displacement control valve connected to the output line of the first open circuit pump;a second load sensing displacement control valve connected to the output line of the second open circuit pump;a pressure compensating pilot valve;a pilot signal line connected to the load, the pilot valve, and the first and second load sensing displacement control valves;a first servo actuator operatively connected with the first pump and the first load sensing displacement control valve, and having an over-center valve connected thereto;a second servo actuator operatively connected to the second pump and the second load sensing displacement control valve;each of the first and second load sensing displacement control valves having two positions, one position wherein the respective actuator is commanded to reduce the fluid displacement of the respective pump and the other position wherein the respective actuator is commanded to increase the fluid displacement of the respective pump.