An Analysis of the Internal Leakage Characteristics of Certain Marotta Valves

Abstract

Excessive internal leakage of certain models of valves had generated an inordinate number of problems during field and qualification testing. Regular failure analysis of these problems did not disclose the basic cause of leakage, but revealed functional characteristics suggestive of further examination. Therefore, these valves were subjected to special tests for the purpose of obtaining data that would further define the cause of failures. Results of the special tests revealed that plastic flow (distortion) of valve seats was the basic cause of internal leakage, and that the plastic flow was caused by a combination of the thermal effect of valve cycling and the extreme force of the poppet striking the valve seat.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1965
Accession Number
AD0832766

Entities

People

  • F. K. Jacobsen

Organizations

  • General Dynamics

Tags

DTIC Thesaurus Topics

  • Assembly
  • Climate Change
  • Distortion
  • Failure Analysis
  • Flow
  • Gas Flow
  • Halocarbon Plastics
  • Manufacturing
  • Materials
  • Photographs
  • Plastic Flow
  • Qualifications
  • Solenoid Valves
  • Solenoids
  • Thermal Expansion
  • Valves

Readers

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  • Systems Analysis and Design