Graco Husky 1590 DB3 Series Installation Manual page 9

Changing the Orientation of the Fluid Inlet
and Outlet Ports
NOTE: Remove and rotate the center manifold(s) to
change the orientation of inlet or outlet port(s). Follow the
Torque Instructions, page 29.
KEY
1
Apply medium-strength (blue) thread locker to the threads. See
Torque Instructions, page 29.
2
Apply medium-strength (blue) thread locker to the threads. See
Torque Instructions, page 29.
N 1/2 in. npt(f) air inlet port
P Muffler. (Not included on
Model No. 253485)
N
P
102
Aluminum Model Shown
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F . 3
IG
Installation
101 Covers
102 Fluid inlet manifold
103 Fluid outlet manifold
106 Manifold and cover
screws
112 Bottom cover screws
103
1
106
106
2
101
112
2
03263B
Fluid Pressure Relief Valve
CAUTION
Some systems may require installation of a
pressure relief valve at the pump outlet to prevent
overpressurization and rupture of the pump or hose.
See F . 4.
IG
Thermal expansion of fluid in the outlet line can
cause overpressurization. This 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 can also occur if the Husky
pump is being 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.
KEY
R 1.5 in. npt(f) fluid inlet port
S 1.5 in. npt(f) fluid outlet port
V Pressure relief valve (Order Part No. 112119 for stainless
steel pumps)
1
Install valve between fluid inlet and outlet ports.
2
Connect fluid inlet line here.
3
Connect fluid outlet line here.
4
Muffler not included on Model No. 253485
4
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F . 4
IG
3
S
V
1
2
R
03461B
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