In this circuit, Cylinder 1 extends first and builds to a pressure of 70 PSI before Cylinder 2 can extend. This
sequence of events should take place every cycle no matter part size or cylinder speed. NOTE: “This sequence of
events should take place” means Cylinder 2 could start prematurely if Cylinder 1 is damaged and cannot move full
stroke or if the machine member it is driving gets bound up and stalls it before reaching the part. “IMPORTANT”
ANY SEQUENCE CIRCUIT MAY NOT MAKE A COMPLETE CYCLE SO THEY MUST NOT BE USED IF
PART DAMAGE OR SAFETY IS AN ISSUE. ALWAYS USE LIMIT SWITCHES OR VALVES FOR POSITVE
POSITIONING.
Energizing Sol.1 starts Cylinder 1 extending to the work. Pressure in the cap end of Cylinder 1 will be
whatever (WE) it takes to move it since its extend speed is controlled by Meter In Flow Control (10). This means
pressure at the 5-Way Sequence Valve (7) pilot port will be less than 70 PSI until work contact. At work contact
pressure in the cap end of Cylinder 1 quickly builds to 70 PSI which shifts 5-Way Sequence Valve (7) and starts
Cylinder 2 extending. Cylinder 2 has Meter Out Flow Controls (9) to keep it from running away and to make sure at
least 70 PSI is available at Cylinder 1.
De-energizing Sol. 1 starts Cylinder 1 retracting and drops pilot pressure at 5-Way Sequence Valve (7) so
Cylinder 2 also starts retracting. Both cylinders continue retracting until they bottom out.