These are forms of poppet valve designed to fit into a manifold block. Just about all valve types can be designed as a cartridge to fit into a block specially machined to accept it. In this way a bank of valves may be built into one block. The block might contain directional valves, relief valves, flow dividers, one way valves and so on.
The directional valves are in the main pilot/solenoid operated. The next diagram shows a 2 way normally closed design. In the de-energised state, the pressure forces the poppet closed against the valve seat. When the solenoid is energised, the pilot poppet is lifted up venting the pressure on top of the main poppet so allowing it to be pushed upwards by the system pressure and opening the passage through the valve seat.
© D.J.DUNN
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