Poppet magic is a form of sympathetic magic that uses a doll to represent the recipient of the magic.
What is a Poppet Valve? This is an important consideration when precise control is needed and here the poppet valve is the better choice.
External pilot pressure is used to lift the poppet off its seat and allow fluid to return to the valve through the outlet.
The idea is to give the poppet and energetic connection to the recipient.
Four-way, three-position spool valves are common.
Looking for some good luck or more prosperity? Still other designs utilize a coil — known as a poppet solenoid valve — which employs a tightly-wound spiral to exert force onto the stem.
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Lubrication is less of a concern in hydraulic systems where the hydraulic fluid itself is a lubricant, making spool valves practical.