chapter  14
Electropneumatic Valves and Controls
Pages 13

Fig.14.2Rapidon-offsolenoidvalvesalsocancontrolananalogproportionalvalve inpneumaticcircuit_(CourtesyofMcKeeEngineeringLab,Dallas,TX.)

binationofsolenoidsenergized.Ifthereare,say,fourorificeareas,eachtwicethearea oftheonebesideit,16differentflows(includingzero)canbecalledfor.SeeFig.7.20 inChap.7foradrawing.