=Introduction= Directional control valves (DCVs) are one of the most fundamental parts of hydraulic and pneumatic systems. DCVs allow fluid flow (hydraulic oil, water or air) into different paths from one or more sources. DCVs will usually consist of a spool inside a cylinder which is mechanically or electrically actuated. The position of the spool restricts or permits flow, thus it controls the fluid flow.
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=References= * [https://www.surpluscenter.com/Hydraulics/Hydraulic-Valves/Solenoid-Valves/?page_no=1&page_length=9999 Surplus center] * [https://www.mcmaster.com/hydraulic-solenoid-valves Mcmaster Carr] * [https://www.tractorsupply.com/tsc/search/hydraulic%20solenoid? Tractor Supply Company] * [https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=hydraulic+solenoid&_sacat=0&LH_TitleDesc=0&_sop=15&_osacat=0&_odkw=hydraulic+solenoid eBay] * [https://en.wikipedia.org/wiki/Hydraulic_machinery Hydraulic machinery] * [https://en.wikipedia.org/wiki/Directional_control_valve Wikipedia: Directional control valve] <youtube>CQPwvWXbV3w</youtube>