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http://dx.doi.org/10.7839/ksfc.2012.9.2.008

Static Characteristics of Electro-Hydraulic Spring Return Actuator  

Jung, G.H. (대진대학교 컴퓨터응용기계설계공학과)
Publication Information
Journal of Drive and Control / v.9, no.2, 2012 , pp. 8-14 More about this Journal
Abstract
Electro-hydraulic spring return actuator(ESRA) is utilized for air conditioning facilities in a nuclear power plant. It features self-contained, hydraulic power that is integrally coupled to a single acting hydraulic cylinder and provides efficient and precise linear control of valves as well as return of the actuator to the de-energized position upon loss of power. In this paper, the algebraic equations of ESRA at steady-state have been developed for the analysis of static characteristics that includes control pressure and valve displacement of pressure reducing valve, flow force on flapper as well as its displacement over the entire operating range. Also, the effect of external load on piston deviation is investigated in terms of linear system analysis. The results of static characteristics show the unique feature of force balance mechanism and can be applied to the stable self-controlled mechanical system design of ESAR.
Keywords
Electro-Hydraulic Spring Return Actuator; Balance Beam; Force Motor; Self-Controlled System;
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