atic system2. Based on the circuit shown in Figure 19-11,complete the following exercises:A. Complete the chart below by estimating therelative air pressure expected at the pilot portsof the directional control valve. Describe thecircuit action as the valves are activated andreleased. Assume instantaneous air exhaust.s are usedhit, theyhe settingRelative Pressureat Pilot PortsCircuitValveRetractionExtensioncan benust beOperationpilotpilotActionAtmospheric Systempressure(Psystem)ValvesPilot-A and Bdepressed.pressure(Patm)operatedvalve shiftsalves, flowallowing airto flow intoblind end oflines.esigneders.ionse used tothe cylinder,cylinderbegins toextendValve Adepressed,B released.ValvesA and Cdepressed.circuitValve Antsdepressed,Valve Creleased.down-urizedValve Areleased.B. What components affect the pressure at theblind and rod end of the cylinder duringcircuit operation?C. Modify the circuit so that air at lower pressurecan be delivered to the pilot-operateddirectional control valve. Describe the impactoftonderyour modification on circuit operation.ait? NVIDIAGEFORCEGTX(intel)CORE I7Bth GenChapter 19 Applying Pneumatic Power475Valve BValve CExtension pilotRetraction pilotValve AGoodheart-Willcox PublisherFigure 19-11. Automatic cylinder reciprocation is possible with this circult The cylinter continuously extends and retracts aslong as the system is pressurized and valve A is activated.cylinder continues to extend until the ramp depressesthe activation mechanism on Valve C.When Valve C is shifted, air is directed to theRetraction pilot of the four-way directional controlvalve. The pilot shifts the valve to direct air to the rodend of the cylinder. The cylinder begins to retract. Theramp moves off Valve C, which allows the Retractionpilot line to vent. The cylinder continues to retract untilthe ramp depresses the activation mechanism on Valve BThis allows system air pressure to again activate theExtension pilot, beginning another sequence. The cylin-der continues to reciprocate as long as Valve A is heldin the shifted position to keep the system pressurized.19.6.1 Booster CircuitA pressure higher than that produced by the systemcompressor is sometimes needed for the operation ofa section of a pneumatic circuit. This higher pressurecan be provided by specialized air-to-air or air-to-oilboosters. Many boosters are basically small-volume,air-powered reciprocating pumps. They produce inten-sified pressure for use in a small section of a system.Figure 19-12 illustrates the circuit and operatingconcepts involved in an air-to-air booster. The circuitshows components in position to begin the process.When the system is pressurized, air flows through1 111

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