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Fluid Pressure Relief Valve

Some systems may require installation of a

pressure relief valve at the pump outlet to pre-

vent overpressurization and rupture of the

pump or hose.

Thermal expansion of fluid in the outlet line

can cause overpressurization. Thermal

expansion can occur when using long fluid

lines exposed to sunlight or ambient heat, or

when pumping from a cool to a warm area (for

example, from an underground tank).

. 6. Fluid pressure relief kit (Aluminum pumps only,

Overpressurization also can occur if the pump

is used to feed fluid to a piston pump, and the

intake valve of the piston pump does not

close, causing fluid to back up in the outlet

line.

. 6 shows Fluid Pressure Relief Kit

819.6479 for aluminum pumps. Use Fluid

Pressure Relief Kit 819.0159, not shown, for

plastic pumps.

Apply thread sealant on threaded connec-

tions and install kit between fluid inlet and

outlet manifolds.

Connect fluid inlet line in one of the

optional ports.

Connect fluid outlet line in one of the

optional ports.

ti14214b

VA25A

models)

859.0088