Accession Number : AD0830747

Title :   AN INVESTIGATION OF THE NOISE PRODUCED BY THE OPERATION OF LESLIE REDUCING VALVES.

Descriptive Note : Final rept.,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE ENGINEERING PROJECTS LAB

Personal Author(s) : Milgram, Jerome H. ; Blake, William K.

Report Date : SEP 1967

Pagination or Media Count : 60

Abstract : The purpose of this report is to characterize the mechanisms of noise production in Leslie pressure reducing valves in order to provide a basis for the design of quieter valves. Some previous work is reviewed and new investigations are reported. These investigations include operational tests of valves as well as the response of the valve structures to external vibration excitation. The investigations indicate that relatively broadband turbulence excites cavity resonances in some of the fluid filled chambers of the valve and structural resonances in the valve castings. Measures have been found to reduce discrete frequency noise; the cavity resonances being altered by altering the cavity geometry, and the structural resonances being altered by altering the boundary conditions necessary for resonances. In one case, a very sharply tuned structural resonance was eliminated by substituting a soft gasket for a hard gasket to alter the end constraint on a valve casting. (Author)

Descriptors :   *NOISE), (*VALVES, PRESSURE, VIBRATION, STEAM VALVES, TURBULENCE, HIGH PRESSURE VALVES, RESONANCE, STRUCTURAL PROPERTIES, REDUCTION.

Subject Categories : Pumps, Filters, Pipes, Tubing, Fittings & Vlvs

Distribution Statement : APPROVED FOR PUBLIC RELEASE