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KS B 6511 Test methods for electro - hydraulic proportional directionalal series flow control valves. 2011.
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Sungdong Kim, Sehyeong Jeon and Daeyoung Shin, A Study on Bandwidth Frequency of directionalal Control Valves based on the Amplitude of Metering Orifice Pressure, Journal of Drive and Control, Vol.14 No.2 pp.1-8 Jun. 2017.
DOI
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