78
VPV Vane Pump
VPV Controls (continued)
Two Pressure Compensator
Solenoid two-pressure compensators are available in nor-
mally open (normally low, energize to high) and normally
closed (normally high, energize to low) versions. These
two-pressure controls can greatly reduce horsepower
demand and heat generation during periods of idle cycle
time, or when the machine operating cycle does not
require maximum pressure.
PUMP OUTPUT
INPUT
CASE DRAIN
P
STC
REMOTE PORT
Solenoid Vent Compensator
Solenoid vented compensators are similar to the two-pres-
sure controls, except that there is no adjustment possible.
By venting the compensator the pump will go to minimum
deadhead.
PUMP OUTPUT
INPUT
CASE DRAIN
P
STC
REMOTE PORT
Torque Limiting Compensator
Torque limiting for VPV limits the input torque to the pump
shaft, in effect limiting the horsepower transmitted to the
load. No torque or horsepower sensing is done on the
load, only at the pump itself. Pump output flow rate is lin-
ear and proportional to movement of the pressure ring.
This compensator is adjustable in the field as torque vs.
flow requirements demand. Consult factory for adjustment
procedure.
PUMP OUTPUT
PUSH ROD
INPUT
CASE DRAIN
P
STC
REMOTE PORT
MOVING
SEAT
Summary of Contents for VPV 100
Page 1: ...Hydraulics VPV Vane Pump Service and Repair Guide ...
Page 99: ...98 VPV Vane Pump Notes ...
Page 100: ......