BS 5944-4:1984-Measurement of airborne noise from hydraulic fluid power systems and components Part 4 :  Method of determining sound power levels from valves controlling flow and pressure 

 - London :  British Standards Institution,  1984. 
 - 12 p. 
<br/><br/>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. 
<br/><br/><label>ISBN: </label>0580137805 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Flow regulators, Liquid valves, Cavitation, Free-field rooms, Hydraulically-operated devices, Hydraulic transmission systems, Sound intensity, Valves, Noise (environmental), Testing conditions, Acoustic measurement, Pressure regulators