Graco Husky 307 Instructions-Parts List Manual page 7

Changing the Orientation of the Fluid Inlet
and Outlet Ports
The pump is shipped with the fluid inlet and outlet
ports facing the same direction. See Fig. 2. If desired,
the direction of one or both ports can be changed.
Remove the manifold(s) from the pump as explained in
steps 1, 2, and 4 on page 21. Reattach with the port
facing the desired direction. See Torque Sequence,
page 32. Do not over-torque.
Acetal Pump Shown
Apply thread lube, and torque to 50 to 60 in-lb
(5.6 to 6.8 N-m). See Torque Sequence, page
1
32. Do not over-torque.
2
1/4 npt(f) air inlet
3
3/8 npt(f) fluid inlet
4
3/8 npt(f) fluid outlet
5
3/8 npt(f) air exhaust port
5
Fig. 2
Installation
1
4
2
3
01459B
Fluid Pressure Relief Valve
CAUTION
Some systems may require installation of a pres-
sure relief valve at the pump outlet to prevent
overpressurization and rupture of the pump or
hose. See Fig. 3.
Thermal expansion of fluid in the outlet line can
cause overpressurization. This can occur when
using long fluid lines exposed to sunlight or ambi-
ent 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
A 3/8 npt(f) fluid inlet port
B 3/8 npt(f) fluid outlet port
C Pressure relief valve
Part No. 112119 (stainless steel)
1
Install valve between fluid inlet and outlet ports.
2
Connect fluid inlet line here. Use a compat-
ible liquid thread sealant or PTFE tape on
connection to prevent air from getting into
the material line.
3
Connect fluid outlet line here.
B
A
Fig. 3
C
3 1
1
2
01539B
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