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  • BSI
    BS 5944-4:1984 Measurement of airborne noise from hydraulic fluid power systems and components - Method of determining sound power levels from valves controlling flow and pressure
    Edition: 1984
    $281.30
    / user per year

Description of BS 5944-4:1984 1984

This British Standard describes procedures for the deter-mination of the sound power levels of a hydraulic fluid power valve, under controlled conditions of installation and operation, suitable for providing a basis for comparing the noise levels of valves in terms of:

  1. A-weighted sound power level;
  2. octave band sound power levels.

From these sound power levels, reference sound pressure levels may be calculated for reporting purposes (see clause 11). For general purposes, the frequency range of interest includes the octave bands with centre frequencies between 125 Hz and 8000 Hz.

This method is applicable to all types of fluid power control valves operating with oil hydraulic fluids* under steady state conditions, irrespective of size or specific function, provided that the noise level measured is dominantly cavitation noise and the physical provisions of the method can be complied with.

The procedures described are intended to measure the airborne noise level obtainable from a valve installation representing good noise control practice, including valve casing noise and the noise radiated by flexible fluid lines immediately adjacent to the valve. Other systems depen¬dent factors are eliminated.

The measurement of valve noise due to instability is specifically excluded from the provisions of this standard. Guidance on valve stability and its detection is given in appendix A. Guidance is also given in appendix B on measuring in an anechoic chamber.

Accuracy of measurement is divided into three classes, A, B and C, which are explained in appendix C.

NOTE. The titles of the publications referred to in this standard are listed on the inside back cover.

* e.g. hydraulic fluid designations L-HH, L-HL, L-HM, L-HR, L-HV and L-HG only as classified in BS 6413 : Part 4.



Describes procedures for the determination of sound power levels of a hydraulic fluid power valve under controlled conditions of installation and operation, suitable for providing a basis for comparing the noise levels of valves.

Standard NumberBS 5944-4:1984
TitleMeasurement of airborne noise from hydraulic fluid power systems and components - Method of determining sound power levels from valves controlling flow and pressure
StatusConfirmed
Publication Date1984-03-30
DescriptorsFlow regulators, Liquid valves, Cavitation, Free-field rooms, Hydraulically-operated devices, Hydraulic transmission systems, Sound intensity, Valves, Noise (environmental), Testing conditions, Acoustic measurement, Pressure regulators
ICS23.100.50 Control components, 17.140.20 Noise emitted by machines and equipment
CommitteeMCE/18
ISBN0 580 13780 5
PublisherBSI
Pages12

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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