Graco Husky 1050 - Fluid Pressure Relief Valve

Installation
312877ZAD 15
Fluid Pressure Relief Valve
FIG. 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 prevent
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.
F
IG. 6 shows Fluid Pressure Relief Kit 238428 for
aluminum pumps. Use Fluid Pressure Relief Kit
112119, not shown, for plastic pumps.
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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.
2
Connect fluid outlet line in one of the
optional ports.
3
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