Gasboy Gilbarco Global Pumping Unit Operation Manual - Manual (Page 11)

MDE-4447A Global Pumping Unit Operation and Service Manual · May 2008 Page 7
Air Separator Float Device Pumping Unit Operation and Maintenance
Air Separator Float Device
On OIML Euro versions of the pumping unit, a float assembly is provided on the pumping unit
vent opening. This assembly is used to prevent liquid from escaping through the vent pipe. See
Figure 3-4 .
Figure 3-4: Air Separator Float Device
Control Valve
The pumping unit uses a control valve that aids in the elimination of air by producing a back
pressure and is also used as a check valve for any fuel above it.
The control valve also contains a pressure relief valve. This valve relieves excess hose
pressure, which may result from the expansion of fuel in the hose during hot weather, to the air
eliminator chamber. This action prevents hoses from bursting and helps prevent pumping unit
leaks.
Figure 3-5: Control Valve