Graymills DDP .375' Pump OMI - Manual (Page 7)

7
Installation
Air Line
A bleed-type master air valve (B) is required in your
system to relieve air trapped between this valve and the
pump. See Fig. 5 to Fig. 7. Trapped air can cause the
pump to cycle unexpectedly, which could result in
serious injury, including splashing in the eyes or on the
skin, injury from moving parts, or contamination from
hazardous fluids.
WARNING
CAUTION
The pump exhaust air may contain contaminants.
Ventilate to a remote area if the contaminants could
affect your fluid supply. See Air Exhaust Ventilation
on page 10.
1. Install the air line accessories as shown in Fig. 5 to Fig.
7. Mount these accessories on the wall or on a bracket.
Be sure the air line supplying the accessories is groun-
ded.
a. The fluid pressure can be controlled in either of
two ways. To control it on the air side, install an
air regulator (H). To control it on the fluid side,
install a fluid regulator (M) near the pump fluid
outlet (see Fig. 5).
b. Locate one bleed-type master air valve (B) close
to the pump and use it to relieve trapped air. See
the WARNING above. Locate the other master air
valve (E) upstream from all air line accessories
and use it to isolate them during cleaning and
repair.
c. The air line filter (F) removes harmful dirt and
moisture from the compressed air supply.
2. Install an electrically conductive, flexible air hose (C)
between the accessories and the 1/4 npt(f) pump air
inlet (see Fig. 2). Use a minimum 1/4” (6.3 mm) ID air
hose. Screw an air line quick disconnect coupler (D)
onto the end of the air hose (C), and screw the mating
fitting into the pump air inlet snugly. Do not connect
the coupler (D) to the fitting yet.
Fluid Suction Line
D The pump fluid inlet is 3/8 npt(f). See Fig. 2. Screw the
fluid fitting into the pump inlet snugly. Use a compat-
ible liquid thread sealant or Teflon
R tape on connec-
tions to prevent air from getting into material line.
D At inlet fluid pressures greater than 15 psi (0.1 MPa,1
bar), diaphragm life will be shortened.
D See the Technical Data on page 4 for maximum suction
lift and flow rate loss at various lift distances.
Fluid Outlet Line
WARNING
A fluid drain valve (J) is required in your system to
relieve pressure in the hose if it is plugged. See Fig. 5
to Fig. 7. The drain valve reduces the risk of serious
injury, including splashing in the eyes or on the skin, or
contamination from hazardous fluids when relieving
pressure. Install the valve close to the pump fluid
outlet.
D Use electrically conductive fluid hoses (N). The pump
fluid outlet is 3/8 npt(f). See Fig. 2. Screw the fluid
fitting into the pump outlet snugly.
D Install a fluid regulator (M) at the pump fluid outlet to
control fluid pressure, if desired (see Fig. 6). See Air
Line, step 1a, for another method of controlling pres-
sure.
D Install a fluid drain valve (J) near the fluid outlet. See
the WARNING above.