QX3
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Internal Gear Pumps

Internal Gear Pump QX

General (deviating values according manufacturer's specification) . . . . . . . . . . . . . . . . . . . Main characteristics for pressure range 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Main characteristics for pressure range 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Main characteristics for pressure range 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Performance graphs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....

Fluid cleanliness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fluid cleanliness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Operational reliability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bolt-on valves - SAE J518 code 61 / ISO 6162-1 pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pipe flange - high...

The QX pumps are the 5th generation of Bucher internal gear pumps, which have proven themselves in thirty years of service around the world. Numerous improvements have been made to the straightforward and robust design. S extremely long service life Advances in the manufacturing process have made it pos­ sible without making higher demands on individual com­ ponents to build pumps that are considerably lighter and more compact. A new tooth profile, conceived and optimised with the help of CAE, has yielded another significant reduction in noise levels. Large sealing areas result in higher...

IMPORTANT.The main characteristics are valid for hydraulic oils DIN 51524 with a viscosity of 20 - 50 mm2/s. The operating pressure at the pump outlet side is specified also for fire-resistant and environmen tally-friendly fluids (HFC). 2.2 Main characteristics for pressure range 1 Displacement Flow rate Maximum speed Operating pressure at the pump outlet side Continuous [PSI] Input power Suction arrangements for pump types QX61 and QX81 Minimum inlet pressure is 0.95 bar absolute with viscosity 10 - 100 mm2/s (other values on request) Speed 1500 rpm Suction height Speed 1800 rpm Suction...

2.3 Main characteristics for pressure range 2 Displacement Flow rate Maximum speed Operating pressure at the pump outlet side Continuous [PSI] Input power 2.4 Main characteristics for pressure range 3 Displacement Flow rate Maximum speed Operating pressure at the pump outlet side Continuous [PSI] Input power 1) Due to manufacturing tolerances, there may be slight variations in the dis­ placement. 5) for speeds < 1450 rpm. the minimum permissible inlet pressure is 13.77 PSI absolute. For HFC application a second suction port may be required 2) maximum 20 second and not more than 10% of the...

Performance graphs The performance graphs shown are valid for the specified pump models. For other pump sizes, contact Bucher Hydraulics GmbH. measured to DIN 45635. Part 26. in Stuttgart University's low-echo noise measurement chamber; measurement distance 1 m; speed n = 1500 rpm; viscosity = 210 S.U.S Pressure range 3.2 Efficiency (h) measured at speed 1450 rpm, viscosity 210 S.U.S Volumetric efficiency Hydromechanical efficiency intermittent operating pressure as a func­ tion of displacement (see section 2.2) Volumetric efficiency Hydromechanical efficiency intermittent operating...

Volumetric efficiency Hydromechanical efficiency intermittent operating pressure 3.3 Operation with variable-speed drives IMPORTANT: The following main characteristics are to be understood as examples only. They are valid only for the specified pump models and parameters. We would be very happy to advice you on the layout of your drive. QX pumps with variable-speed drive all contain an external drain port. Typical loading cycle for a QX pump with variable-speed drive Pump QX53-063 measured: with viscosity 210 S.U.S n Minimum speed as a function of pressure Pump QX53-063 measured: with...

Single pumps 4.1 Dimensions [inch] Frame size Pressure range Suction port: to SAE J518 1) External drain port (option 06) A B Mounting: oval 2-hole­ flange to ISO 3019/1 (SAE) Pipe flange dimensions, SAEJ518 code 61 / ISO 6162-1 High pressure type up to 6090 PSI (see section 10.2) Low pressure type for up to 232 PSI (see section 10.3) For other shaft ends. contact Bucher Hydraulics GmbH Threaded port to DIN 3852. Part 2 Pressure port to SAEJ518 code 61 / ISO 6162-1 can be supplied for pressure ranges 2+3 100-P-000021-US-15 / 09.2014 Internal Gear Pump QX

external drain port - see special feature 06 special model: 4-hole flange ISO 3019/2 depending on operating conditions, a second suction port may be required on QX61 (SAE 2”) and QX81 (SAE 2 1/2”) - see section 2.2.1 external drain port - see special feature 06 100-P-000021-US-15 / 09.2014 Internal Gear Pump QX special model: 4-hole flange ISO 3019/2

external drain port - see special feature 06 special model: 4-hole flange ISO 3019/2 4.5 Ordering code for single pumps Q X Series Frame size Rotation viewed from shaft end Options / special features Pressure range Ordering example: Required: Displacement: Continuous pressure: for use with mineral oil Ordering code: -O = without priming 06 = external drain port in the pump rear cover QX 2-5 G1/4” QX 6 G3/8” QX 8 G1/2” 09 = Viton seals 12 = 2-hole mounting flange to ISO 3019/2 (metric): size QX3-6 S direction of rotation - CW (right) 29 = for HFB and HFC fluids, frame sizes 2-5 S 2-hole...

Double pumps QX double pumps consist of two single pumps mounted on a common drive shaft. Hydraulically, the two pumps oper­ ate independently of one another but they share a common suction port in the pump's centre section. The larger pump of the combination is situated at the shaft end (the drive side) and is referred to as Pump 1. With equal frame sizes, the pump with the larger displacement is situated at the drive side. Double pumps can be combined as shown in the following table. If a letter is shown at the intersection point of the two pumps, the letter identifies the page in section...