US 7,487,706 B2
	Device for controlling a hydraulically driven motor
Per-Ola Vallebrant, Trollhättan (Sweden); and Mikael Sannelius, Älvsjö (Sweden)
Assigned to Parker-Hannifin Corporation, Cleveland, Ohio (US)
Appl. No. 10/549,729 PCT Filed Mar. 19, 2004, PCT No. PCT/SE2004/000407 § 371(c)(1), (2), (4) Date Sep. 19, 2005, PCT Pub. No. WO2004/083652, PCT Pub. Date Sep. 30, 2004.
Claims priority of application No. 0300760 (SE), filed on Mar. 21, 2003.
Prior Publication US 2006/0249015 A1, Nov. 09, 2006
Int. Cl. F15B 13/04 (2006.01)

U.S. Cl. 91—418  [91/445; 91/446]

12 Claims

1. An arrangement for controlling a hydraulically driven motor (2), forming part of a hydraulic system in which hydraulic fluid under pressure forms a main flow through a main duct (1) in which the motor is connected, the motor being adapted to drive a load with varying loading, and one or more valves (6, 7) being adapted for controlling the hydraulic fluid flow through the motor during operation and also for starting and stopping of the motor, characterized in that one of the valves comprises a spool-type flow control valve (7) which is connected in the main duct (1) downstream of the motor (2) and is adapted for starting and stopping the motor and flow control providing substantially constant flow rate of the hydraulic fluid through the motor under varying loading.