PressureRelief

Handles sudden changes of discharge pressure by re-routing to the intake side of the pump.

• Operating pressure range of 75-300 PSI
• Greater than 300 PSI needs to be set OFF
• In OFF position when not in use
• Exercise and reset weekly or after use to 150 PSI

• Valve OFF
• Open discharge(s)
• Raise engine to discharge pressure
• Turn valve to ON
• Turn T valve counter clockwise until valve opens (Amber)
• Then turn T valve clockwise until valve closes (Green)

When no longer needed reduce RPM to close valve and then reset to 150.

• Not a true relief valve.
• Reduces engine RPM to reduce pressure

Externally mounted- set to 100 PSI to protect against water hammer from intake, protects hose and from cavitation

Factory installed- pre-plummed and dumps to ground

• Shall be set every 30 days or after pumping
• Charge and intake line from hydrant
• Open intake
• Back off lock nut until water flows
• Slowly tighten until water stops flowing, then 1/4-1/2 farther
• Tighten the lock nut.