PVG 16, PVG 32 and Open Circuit Load Sense Example
The pump receives fluid directly from the reservoir through the inlet line. A screen in the inlet line
protects the pump from large contaminants. The pump outlet feeds directional control valves such as
PVG-32’s, hydraulic integrated circuits (HIC), and other types of control valves. The PVG valve directs and
controls pump flow to cylinders, motors and other work functions. A heat exchanger cools the fluid
returning from the valve. A filter cleans the fluid before it returns to the reservoir.
Flow in the circuit determines the speed of the actuators. The position of the PVG valve spool determines
the flow demand. A hydraulic pressure signal (LS signal) communicates demand to the pump control. The
pump control monitors the pressure differential between pump outlet and the LS signal, and regulates
servo pressure to control the swashplate angle. Swashplate angle determines pump flow.
Actuator load determines system pressure. The pump control monitors system pressure and will decrease
the swashplate angle to reduce flow if system pressure reaches the PC setting. A secondary system relief
valve in the PVG valve acts as a back-up to control system pressure.
Pictorial circuit diagram
System pressur e
Servo pressur e
Actuator pressur e
Load sense pressur e
Actuator retur n
Suction / case drain /
system retur n
K/L Frame Series 45
open circuit axial
piston pump with
load sensing contro l
PVG 32
multi-sec tion
load
sensing
contro l
valve
P101 658E
Reservoir
Filter
Heat exchanger
Double-ac ting cylinder
Bi-directional
gear moto r
Service Manual
PVG 16 and 32 Service Assembly/Disassembly Guide
General information
©
Danfoss | November 2017
L1104530 | AX00000133en-US0106 | 7
