BLACKMER IOM E Series, Installation, Operation & Maintenance Manual, Page: 22 / 52

1901-a00 22
CHANGING RELIEF VALVE PRESSURE SETTING
(E1-2 thru E1-82 Models)
In order to maintain the integrity of the relief valve setting, the E1-2 thru E1-82 E Series relief valves are not externally adjustable.
Instead, the setting is adjusted by changing the poppet and spring.
1. Obtain a new poppet and spring for the desired relief-valve setting.
2. Disassemble relief valve per the instructions in Section 7,
Pump Disassembly & Repair Processes .
3. Reassemble the relief valve using the new poppet and spring per the instructions in Section 7, Pump Disassembly &
Repair Processes .
CHANGING RELIEF VALVE PRESSURE SETTING
(E1-133 and E1-222 Models)
1. Carefully remove the valve cap covering the adjusting screw.
2. Loosen the adjusting screw lock nut.
3. Install a pressure gauge in the discharge line.
4. Turn the adjusting screw inward (clockwise) to increase pressure and outward (counter-clockwise) to decrease pressure.
5. With the discharge line valve closed (at a point beyond the pressure gauge), the gauge will show the maximum pressure
(that the pressure relief valve will allow) while the pump is in operation.