How do hydraulic valves work? Hydraulic valves use two different methods to control fluid flow. One type does it by using bore, spool and different ports, while the other type uses poppet valves. The basic purpose of both these types of valves are to change or control the direction of fluid flow.
The valves that use bore and spool to control flow have four or two ports to help the movement of the fluid. The valve works by the principle that when they are activated, the internal spring is compressed by the spool which opens the path between the ports. The valve is deactivated, the spring goes back to its decompressed state which forces the spool to its original position, and thus the pathways are closed again.
The poppet valves perform the same work in a different way. The flow of fluid here is controlled by just the closing or opening of the valve’s poppet. An external force opens the poppet and allows fluid flow.
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