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QXT series
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Catalog excerpts

QXT series - 1

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 1.1 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 Track laying machinery Technical data Description, value Installation attitude 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 (higher values, contact Bucher Hydraulics)

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QXT series - 2

2.2 Flow dividers with outlet flows of equal sizes These operating data are valid for mineral oils with 42 mm2/s. Please contact Bucher if you require unequal outlet flows. Maximum inlet flow Q0 max Type Cont./ Interm. pressure 1) bar Speed nmax / nmin min-1 2 outlet flows l/min 3 outlet flows 2) l/min 4 outlet flows 2) l/min 1) Intermittent for max. 20 sec/min but not than 10% of the duty cycle 2) for 3 and 4 outlet flow please contact Bucher Hydraulics 2.3 Choose the optimal flow divider These operating data are valid for mineral oils with 42 mm2/s. For the highest division accuracy as...

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QXT series - 3

Performance curves These operating data are valid for mineral oils with 42 mm2/s. Tests carried out on a QXT flow divider, type 32-016/32-016, produced the results shown below. For the same speed, larger flow dividers have a better accuracy while smaller ones display a bigger difference between the two outlet flows. The division accuracy of the outlet flows Q1 and Q2 depends mainly on the pressure difference between the two outlet lines and the ratio Q0 / Q0 max The pressure drop across the flow divider is dependent on Q0 / Q0 max Using the curves, the accuracy of flow division and the...

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QXT series - 4

Mounting threads 4 x dimensions 'G' - both ends Mounting threads 4 x dimensions 'G' - both ends 100-P-000059-E-06/04.2014 Internal Gear Flow Divider QXT

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QXT series - 5

Mounting threads 4 x dimensions 'G' - both ends 4.5 Flow divider with 3 displacements (please contact Bucher Hydraulics) 100-P-000059-E-06/04.2014 Internal Gear Flow Divider QXT

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QXT series - 6

4.6 Flow divider with 4 displacements (please contact Bucher Hydraulics) Ordering code for 2 displacements Q X T 3 2 Outlet displacement Frame size Outlet displacement Frame size Special features 5.1 Ordering example For dividers with 3 outlet flows: QXT22-005 / 22-005 / 22-005 Flow divider combinations must contain the same frame sizes, pressure ranges and outlet flows. For dividers with 4 outlet flows: QXT62-100 / 62-100 / 62-100 / 62-100 If 3, 4 or unequal flows are required, please contact Bucher Hydraulics = Viton seals and without priming = port at outlet (E) in SAE J518 code 61 / ISO...

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QXT series - 7

6.1 Bolt-on valves - SAE J518 code 61 / ISO 6162-1 pattern Pressure relief valve Pressure relief valve solenoid control Accumulator charging valve Technical data sheet Technical data sheet Technical data sheet 6.1.1 Example for Bolt-on valves, mounted on QXT flow divider Bolt-on valve with threaded ports IMPORTANT: For detailed informations on Bolt-on valves see www.bucherhydraulics.com Internal Gear Flow Divider QXT

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QXT series - 8

6.2 Pipe flange - high pressure type - up to 420 bar - SAE J518 code 61 / ISO 6162-1 pattern H Threaded pipe flanges are spot-faced for pipe fittings. Material: ST37 / For Viton seals, contact Bucher Hydraulics Ordering­ number Ordering code Viton seal 90 Shore 'A' E 2014 by Bucher Hydraulics GmbH, D-79771 Klettgau All rights reserved. Data is provided for the purpose of product description only, and must not be construed as warranted characteristics in the legal sense. The information does not relieve users from the duty of conducting their own evaluations and tests. Because the products...

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