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RELIEF VALVE MECHANISM WITH A PILOT

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Port a is connected to the high-pressure main and ports b and c to the low-pressure main. When the pressure of the fluid in port a is within the preset value, pilot valve spool 2 is held by helical spring 4 in its lower position and through slots d it connects chamber f, above valve spool 1, to the high-pressure main. By means of land e of pilot valve spool 2, chamber f is disconnected from the low-pressure main. In this position, valve spool 1 is held in its seat by spring 3 and the pressure difference at its ends. When the pressure in port a exceeds the preset value, pilot valve spool 2 is lifted, disconnecting chamber f from the high-pressure main and connecting it to the low-pressure main. In this position, valve spool 1 is held in its seat only by spring 3. The pressure in port a overcomes the resistance of spring 3, lifting valve spool 1 and connecting port a to the low-pressure main (port c) until the pressure drops to within the preset value. Springs 3 and 4 are not adjustable.
$3606$SHP,Va$

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