Page 14 - Troubleshooting Paper Mill Hydraulics Sample Excerpt 2
P. 14
No. 3 P.M. Winder Power Supply and Rider Roll
No 20 Reducing Relieving Valve
21 Gauge Isolation Valve
This valve is used to protect the pressure gauge when it is not
necessary to read the hydraulic pressure. When the actuator is not
depressed, oil in the gauge is directed back to the tank. When the
button is pushed, pressure in the line is directed to the gauge. The
valve is a normally closed, two position, three way, manually
actuated, spring return, spool valve.
22 Directional Valve
To lower the Rider Roll, voltage is applied to the RRL-SV solenoid on
the pilot valve. Pilot pressure is directed internally to shift the main
spool into the “A” (straight arrows) position. The system volume is
directed through the “P” and “A” ports then into the full piston sides of
the cylinders.
Page 44 Troubleshooting Papermill Hydraulics
