Graymills DDP 1' Pump OMI - Manual (Page 9)

9
Changing the Orientation of the Fluid Inlet
and Outlet Ports
The pump is shipped with the fluid inlet (R) and outlet (S)
ports facing the same direction. See Fig. 4. To change the
orientation of the inlet and/or outlet port:
1. Remove the screws (106 or 112) holding the inlet (102)
and/or outlet (103) manifold to the covers (101).
2. Reverse the manifold and reattach. Install the screws
(106 or 112). Torque the manifold screws to 80 to 90
in-lb (9 to 10 N-m). See Fig. 4.
Figure 4
1
KEY
N 1/2 npt(f) air inlet port
P Muffler; air exhaust port
is 3/4 npt(f)
R 1” fluid inlet port
S 1” fluid outlet port
101 Covers
102 Fluid inlet manifold
103 Fluid outlet manifold
106 Manifold screws
112 Manifold screws
N
P
R
S
1
103
102
101
112
106
Torque to 80 to 90 in-lb (9 to 10 N-m).
1
04155A
Fluid Pressure Relief Valve
Some systems may require installation of a pressure
relief valve at the pump outlet to prevent overpressur-
ization and rupture of the pump or hose. See Fig. 5.
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 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.
CAUTION
Figure 5
1
2
Connect fluid inlet line here.
KEY
R 1” fluid inlet port
S 1” fluid outlet port
V Pressure relief valve
R
S
Connect fluid outlet line here.
1
2
3
Install valve between fluid inlet and outlet ports.
V
3
04228A