practical proportional control valve and servo valve

http://www.festo-didactic.com/ov3/media/customers/1100/0060739001156253276.pdf


http://www.burkert.com/products_data/datasheets/DS2836-Standard-EU-EN.pdf




http://hydraulics.eaton.com/products//pdfs/gb2459.pdf




http://www.grouphes.com/hes/Duplomatic/pdf_eng/89110.pdf



http://www.burkert.poznan.pl/pdf/6223en.pdf


http://www.samson.de/pdf_en/t60000en.pdf

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