Component Related Documentation

A proportional pressure control valve allows the pressure to be controlled in a circuit from 0 to 100% of the valve’s rated pressure range. An amplifier (driver) card may be located onboard the valve or the card may be remotely located. Proportional pressure control valves may be either direct acting or solenoid-controlled, pilot-operated. As the input command is varied the pressure will vary. In most valves of this type, a positive command input signal will cause the control element, often a pilot pressure relief valve, to restrict the fluid flow, thus increasing the pressure setpoint.

Safety Related Notes

Before working on this machine, perform lockout-tagout procedures per the rules of your plant. Determine the sources of energy on this machine – electrical, pneumatic and hydraulic – and release or vent sources of stored energy – electrical capacitors, air receivers, and hydraulic accumulators. Shut off sources of power – electrical, pneumatic and hydraulic. Safely block mechanical sources of energy such as loaded springs and loaded machine members, or safely position the machine members so they are unloaded and springs are not under tension. Beware of hot hydraulic fluid and hot surfaces which can cause burns. Never “crack a hydraulic or pneumatic fitting” to check for the presence of stored energy. Hydraulic fluid injection injuries, as well as injection injuries from many other fluids, are extremely serious and must be treated immediately by medical personnel familiar with this type of injury. Loss of body parts or death may result from improperly treated fluid injection injuries! Never use your hands to feel for a hydraulic leak! Review the schematics and think before proceeding to work on the machine to ensure you have made the machine safe to work on.