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      • HARVEST
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      Investigation of spring valves

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      Campbell_Douglas_William_sec_1974.pdf (29.64Mb)
      Date
      1974
      Author
      Campbell, Douglas William
      Type
      Thesis
      Degree Level
      Masters
      Metadata
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      Abstract
      This thesis presents a study of spring valves with the ultimate aim of using them as high pressure hydraulic flow-control valves for agri­cultural applications. A closed helical coil spring, when pressurized, will provide a controlled flow between the coils when extended or later­ally deflected a given distance. Tests revealed severe longitudinal oscillations when operating in the extension mode, resulting in a very low fatigue life. The lateral deflection mode did not exhibit these oscillations but did exhibit a surge phenomenon at higher pressures. A four-way closed center spring valve was built using four exter­nally pressurized springs operating in the lateral deflection mode. A unique cable actuation system provided good proportional control with minimum deadzone and tolerancing. Tests showed that performance was acceptable up to approximately 1,000 psi but surges at higher pressures deteriorated performance. As a result of this study it is concluded that spring valves have applications at moderate pressures but operation at higher pressures is not practical.
      Degree
      Master of Science (M.Sc.)
      Department
      Mechanical Engineering
      Program
      Mechanical Engineering
      Committee
      Budney, D.; Danyluk, H. T.; Ukrainetz, Paul R.; Hertz, P. Barry; Wilson, J. N.
      Copyright Date
      1974
      URI
      http://hdl.handle.net/10388/etd-07152010-103652
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      • Graduate Theses and Dissertations
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