INSTALLATION, OPERATION, &
MAINTENANCE MANUAL
TITLE:
F84L Series Liquid Relief Valve
Rev. J
Page 10 of 18
4.5
LIFT LEVER OPERATION
CAUTION:
Do not operate a lift lever unless valve inlet pressure is at least 75% of nameplate set
pressure. Prepare the system as necessary to handle a discharge from the valve.
NOTE:
The lift lever enables verification that the valve spindle and seat can open freely, but does
not allow set pressure to be verified.
1)
With inlet pressure as stated in the above CAUTION, rotate the lift lever handle clockwise or
counterclockwise until it meets resistance.
2)
Continue rotating the handle slowly until there is indication of flow through the valve. NOTE that,
if inlet pressure is greater than reseat pressure (approx. 80% of set pressure), the valve may
develop full flow (gush) and will stay open long enough to blow down to that pressure.
3)
Return the lift lever handle to the down position. If flow through valve could not be achieved, or if
the valve does not close, have the valve disassembled and serviced by a qualified organization.