SNIPIISINAPPROVEDDATEDESCRIPTIONPLASCOMPONENT LIST1) UNIDIRECTIONAL, FIXED- DISPLACEMENTHYDRAULIC PUMP AND MOTOR.2) HIGH-PRESSURE RELIEF VALVE3) 4-WAY, 3-POSITION, BLOCKED- CENTER,DOUBLE SOLENOID-ACTUATED, MAINTAINED-CONTACT, SPRING-CENTERED VALVE.4) LOW-PRESSURE RELIEF VALVE.5) FLOW CONTROL VALVE, ADJUSTABLEAND PRESSURE COMPENSATED WITHBYPASS.Sol. ASol. B6) PRESSURE SWITCHУХI7 DOUBLE-ACTING HYDRAULIC CYLINDER.8) LIMIT SWITCHTEMMHEAT TREATFINISHMATERIALSTOCK SIZEONNO.TALLEY INDUSTRIESMESA, ARIZONAMANUFACTURING ENGRG DEPTENGRG CHANGETOOL NAME90 TON HYDRAULIC PRESS SCHEMATICENGRG PART NAME90 TON COMPACTION PRESSUNLESS OTHERWISE NOTEDR.K. WALKER 8/28G.A.Schneider 8/28NMRATOLERANCES ON:ANGLES 1CHECKEDMACHINED DIA ON A COMMON CENTERLINE CONCENTRIC WITHIN005 T.I.RNORMALITY AND PARALLELISM OF MACHINED SURFACES .002 PER INCHTO A MAX. OF .010 FOR A SINGLE SURFACEREMOVE BURRS AND SHARP EDGES .030 MAXZONEAPPROVEDOF 1 SCCALESHEETENGRG PART NO.SIZE CODE IDENT, NO TOOL DRAWING N08568321ZNEA 12116449Unit 23 Instrumentation and Control Drawings00669TOCNDU CHPrint supplied by Talley IndustriePR 23-2. 90 Ton Hydraulic Press SchematicCopyright Goodheart-Willcox Co., Inc. Refer to print PR 23-2. The sequence of operations for this print is given below. Answer the questions following thesequence of operationsSequence of operationsDescription: This is a system to control a 90-ton hydraulic, explosive-compaction press. The press ram descends ata controlled rate, slowly compacting the explosive charge to avoid detonation due to a sudden shock.1. The cycle is started by energizing solenoid A, which shifts control valve (3) and supplies pressure tothe head end of the hydraulic cylinder (7). This operates the ram.2. The cylinder (7) extends at a slow rate controlled by the fluid in the rod end of the cylinder, which isvented through the flow control valve (5).3. When the cylinder is fully extended and the pressing pressure is reached, the press ure switch (6)de-energizes solenoid A and energizes solenoid B. This shifts control valve (3) to retract thecylinder (7). Control valve (5) has an integral check valve that permits the free flow of fluid in theopposite direction, causing cylinder (7) to rapidly retract.A The retraction of cylinder (7) actuates the limit switch (8), which de-energizes solenoid B. Controlvalve (3) returns to the neutral position. This completes the cycle. This circuit has safety features. Onpower outage, both solenoid A and B are de-energized. This allows valve (3) to return toelectricalthe center position, thus stopping ram travel. Also, valve (4) provides low pressure relief on the ramupstroke and valve (2) provides high pressure relief on ram downstroke.Questions8. What completes the cycle?9. What happens in the event of electrical power outage?10. Give the function of valves (2) and (4).