BS ISO 17559 pdf download

BS ISO 17559 pdf download

BS ISO 17559 pdf download Hydraulic fluid power — Electrically controlled hydraulic pumps — Test methods to determine performance characteristics
This International Standard specifies methods for determining the steady-state performance characteristics anddynamic performance characteristics of positive-displacement electrically and electronically controlled hydraulicpumps(hereafter referred to as “pump” or “pumps”), so as to allow comparison of the performance of differentcomponents.
Pumps covered by this International Standard have the capacity to affect changes in the output flow or pressurein proportion to the electrical or electronic input signals. These pumps can be of the load-sensing control type,servo-control type, or electrical variable displacement mechanism type, which control output flow and outputpressure by feedback using electrical signals.
The accuracy of measurement is divided into three classes,A, B and C, which are explained in Annex A.
2Normative references
The following referenced documents are indispensable for the application of this document. For datedreferences, only the edition cited applies.For undated references, the latest edition of the referenced document(including any amendments) applies.
ISO 3448,Industrial liquid lubricants – ISo viscosity classification
IS0 4391,Hydraulic fluid power — Pumps,motors and integral transmissions — Parameter definitions andletter symbois
ISO 4406, Hydraulic fluid power —Fluids — Method for coding the level of contamination by solid particlesIS0 4409,Hydraulic fluid power — Positive displacement pumps,motors and integral transmissions —Determination of steady-state performance
ISo 5598,Fluid power systems and components Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in lSO 5598 and the following apply.3.1
electrically controlled hydraulic pump
variable displacement pump which is capable of controlling the pressure or flow rate, or the pressure and flowrate corresponding to an input signal
minimum flow command
minimum input flow command signal needed to maintain the maximum working pressure
minimum controllable pressure
minimum output pressure when the absolute value of the input pressure command signal is zero and the inputflow command signal is maximum (see 7.2.4)
dead zone
range wherein the output pressure or output flow being controlled by the input signal does not vary when theabsolute value of the input signal increases from zero or decreases to zero
load volume
gross volume of working fluid in the main pipelines from the outlet of the pump to be tested to the inlet of theloading valve
pressure compensation
condition in which the output flow starts to decrease by the variable displacement control mechanism when theoutput pressure approaches a set pressure
deadhead pressure
output pressure without flow
4 Symbols
4.1 The physical quantity letter symbols and their suffixes used in this International Standard (see Table 1).are fully explained in lsO 4391.
Units are given in Table 1 and Annex A.
4.2Graphical symbols used in Figures 1 and 2, showing test circuit diagrams, conform to lSo 1219-1 andISO 1219-2.
5 Test installation- General requirements
5.1.1 Unless otherwise specified, install the pump with the output shaft horizontal and the drain port facingupwards.
5.1.2 Use a hydraulic test circuit conforming to Figure 1 for test pumps having a pressure control valve tocontrol the pressure in the pressure-compensation state and a flow control valve to control the output flow.5.1.3 Use a hydraulic test circuit conforming to Figure 2 for test pumps that utilize electrical input signals tocontrol the pressure in the pressure-compensation state and either the position or angle of the mechanism tovary the displacement of the pump.

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