ABSTRACT

Supply pressure acted on the bottom of the ma1n poppet. Pilot pressure acted on the top. The area ratio was 2. Spring force was negligibly small. Supply and pilot pressure were measured by pressure transducers. An extension rod of 3 mm in diameter was attached to the poppet. Compared with top area of the logic valve, area of the rod was very small. Displacement of the main poppet was detected through the extension rod from outside of a block of a logic valve with a gap sensor.