A56 series yuken Variable piston pump

YUKEN A series variable piston pumps have a wide range of displacement, ranging from 10cm3/rev to 219cm3/Rev. Common displacement includes：
A10 series :  displacement 10.0cm3/rev
A16 series :  displacement 15.8cm3/rev
A22 series :  displacement 22.2cm3/rev
A37 series :  displacement 36.9cm3/rev
A56 series :  displacement 56.2cm3/rev
A70 series :  displacement 70.0cm3/rev
A90 series :  displacement 91.0cm3/rev
A145 series :  displacement 145cm3/rev

YUKEN A56 series variable piston pump model naming rules
The model of YUKEN A56 series variable piston pump usually consists of multiple fields, each field represents a different parameter or characteristic.Taking the model A56-F-R-01-B-K-32 as an example, the meanings of each field are as follows：
A56: Series number, indicating that the pump belongs to the A56 series, with a geometric displacement of 56.2 cm3/Rev.
F/L: Installation method, F means flange installation, L means foot seat installation.
R/L: Direction of rotation, R means clockwise rotation, L means counterclockwise rotation.
01/02/04/05: Control type code, such as 01 indicates the electro-hydraulic proportional load sensitive type, 02 may indicate the proportional electro-hydraulic control type (with amplifier), 04 indicates the pressure compensation control type, etc.
B/C/H: Pressure adjustment range, B represents 1.2~7MPa, C represents 2~16MPa, and H represents 1.2~21MPa.
S/K: The position of the interface, S represents the side interface, and K represents the extension of the flat key shaft.
32: Design the serial number to distinguish between different versions or batches of pumps.

Common model classification
There are many models of YUKEN A56 series variable piston pumps, which can be classified according to different dimensions such as control method and installation form.The following are examples of some common models：
Classification by control method
Pressure compensation control type (FR type): such as A56-F-R-01-B-K-32, A56-F-R-01-C-S-K-32, A56-F-R-01-H-S-K-32, etc.
Load-sensitive control type (FL type): such as A56-F-L-01-B-S-K-32, A56-F-L-01-C-S-K-32, A56-F-L-01-H-S-K-32, etc.
Special control types: such as proportional electro-hydraulic control type (FS type) A56-F-R-02-S-K-A100-32, constant power control type A56-F-R-02-S-K-R200-32, etc.
Classified by installation form
Flange mounting type (F type): such as A56-F-R-01-B-S-K-32, A56-F-L-04-H-S-K-32, etc.
Foot mount type (L type): such as A56-L-R-01-C-S-K-32, A56-L-R-01-H-K-32, etc.

 the range of core parameters
The core parameters of YUKEN A56 series variable piston pumps include displacement, working pressure, speed range, volumetric efficiency, noise level, etc.The following are some typical parameters：
Displacement: 56.2 cm3/rev (standard).
Working pressure: up to 21MPa (type H), 16MPa (type C), 7MPa (type B).
Speed range: 600~1800 r/min.
Volumetric efficiency: ≥98% (under 16MPa/1800r/min operating conditions).
Noise level: ≤57.3dB(A) (under 21MPa/1500r/min operating conditions).
Applicable oil: mineral oil or synthetic hydraulic oil (ISO VG32~68).