The directional control valves so far studied are all of the type that uses a sliding piston or spool. Other designs use flat plates and poppets but the functions are the same although they may not be as robust and are more suited to pneumatics. Poppets make take the form of a ball, a flat plate or a cone. The diagram shows a 3/2 poppet valve. In the position shown P is connected to A. When a force is applied the poppet moves to the other position and flow is from A to T.
The diagram below shows a 5/2 poppet valve. This is more common for pneumatics than hydraulics.
© D.J.DUNN
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