Internal Gear Flow Divider
Series QXT

S Extremely high division accuracy
S Exceptionally quiet operation
S Negligible pressure pulsations
S Long service life
S High efficiency, since operating principle ensures there
are no throttling losses
S A very wide range of division ratios is available
S Also suitable for special fluids such as HFC, envi-ron­
mentally friendly and low viscosity fluids

1

General

1.1 Product description
Series QXT flow dividers are internal gear units that can divide a flow into as many as four portions. The division ratios
are constant and are unaffected by the loads at the actuators. They can be used, for example, to provide synchronised movement of unequally loaded cylinders. Several hy­
draulic motors can be driven at the same speed, irrespect­
ive of their external loads. Since they operate on the prin­
ciple of the rotating internal gear set, these flow dividers
work without any throttling losses, which is in strong contrast
to spool-type flow dividers. The QXT flow divider can also

be used to produce pressure intensification i.e. the outlet
pressure from the flow divider is higher than its inlet pres­
sure. This takes place at high efficiency, since the operating
principle ensures that the only losses that can possibly oc­
cur are proportional to the pressure difference across the
unit. The unit is based on the well-known QX internal gear
pump, which is distinguished by its very low noise levels and
al-most imperceptible pressure pulsations. The large num­
ber of closely spaced sizes ensures that the right size is al­
ways available for every application.

1.2 Application examples
S Air conditioning Systems

S Waste compactors

S Track laying machinery

S Hydraulic presses

2

Technical data

2.1 General
Characteristics

Unit

Description, value

Installation attitude

unrestricted

Hydraulic fluid

HLP mineral oils to DIN 51524, Part 2
HFB, HFD and HFC fluids to VDMA 24317
other fluids - contact Bucher Hydraulics

Min. fluid cleanliness level
Operating viscosity
Starting viscosity
Hydraulic fluid temperature

ISO 4406 class 20/18/15, or NAS 1638 class 9
mm2/s
°C

10 … 100
10 … 300

(higher values, contact Bucher Hydraulics)

HLP mineral oil
- 80 max.
HFB, HFD and HFC 50 max.

Reference: 100-P-000059-E-06
Issue: 04.2014

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