Fluid pressure relief valve – Graco HUSKY 312877C User Manual

Page 13

Installation

312877G

Fluid Pressure Relief Valve

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

1050A

models)

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).

Overpressurization also can occur if the

Husky 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 238428

for aluminum pumps. Use Fluid Pressure

Relief Kit 112119, not shown, for plastic

pumps.

Pressure

Relief Kit

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.

ti14214a