cover
gasket-cover
centrifugal air separator
o-ring
end cap
relief (by-pass)
valve assembly
rotor and shaft
idler
o-ring
pump head assy
air separator
chamber
lip seal
float & valve
seat assembly
Figure 11.1: CPU Exploded View
11.2 By-pass (Relief) Valve Assembly
The by-pass assembly, Fig 11.2, is a spring loaded valve which allows product to be pumped
from the pressure side of the pumping unit to the suction side. This valve is forced open when
the pumping unit is running, generating pressure at the outlet, but the nozzle is closed. The
pressure which is built up forces the valve off of its seat and product circulates through the
pumping unit. The pressure at which this valve will open is called the by-pass pressure. It is
factory set to be 131-138 kPa (19 to 20 psi) in standard capacity single and two product dual
pumps, and 186-193 kPa (27 to 28 psi) in all high capacity and single product dual pumps.
WM048523 Rev 08 01/2019 185
11 Suction Pumps
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