Graymills DDP 1' Aluminum Pump - Manual (Page 6)

6
Installation
Mountings
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.
D Be sure the mounting surface can support the weight of
the pump, hoses, and accessories, as well as the stress
caused during operation.
D For all mountings, be sure the pump is bolted directly to
the mounting surface.
D For ease of operation and service, mount the pump so
the air valve cover (2), air inlet, and fluid inlet and
outlet ports are easily accessible.
Air Line
WARNING
A bleed-type master air valve (B) is required in your
system to relieve air trapped between this valve and the
pump. Trapped air can cause the pump to cycle unex-
pectedly, which could result in serious injury, including
splashing in the eyes or on the skin, injury from mov-
ing parts, or contamination from hazardous fluids. See
Fig. 3.
1. Install the air line accessories as shown in Figs. 2–4 on
pages 8 and 9. Mount these accessories on the wall
or on a bracket. Be sure the air line supplying the
accessories is grounded.
a. Install an air regulator (C) and gauge to control the
fluid pressure. The fluid outlet pressure will be the
same as the setting of the air regulator.
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 a grounded, flexible air hose (A) between the
accessories and the 1/2 npt(f) pump air inlet (N). See
Fig. 5. Use a minimum 3/8” (9.5 mm) ID air hose.
Screw an air line quick disconnect coupler (D) onto the
end of the air hose (A), and screw the mating fitting
into the pump air inlet snugly. Do not connect the
coupler (D) to the fitting until you are ready to operate
the pump.
Installation of Remote Pilot Air Lines
1. Connect air line to pump as in preceding steps.
2. Connect 1/4 in. O.D. tubing to push type connectors
(14) on air motor of pump.
NOTE: by replacing the push type connectors, other sizes
or types of fittings may be used. The new fittings will
require 1/8 in. npt threads.
NOTE: the air pressure at the connectors must be at least
30% of the air pressure to the air motor for the pump to
operate.
Fluid Suction Line
1. Use grounded fluid hoses. The pump fluid inlet (R) is
1” npt(f). See Fig. 5. Screw the fluid fitting into the
pump inlet securely.
2. If the fluid inlet pressure to the pump is more than 25%
of the outlet working pressure, the ball check valves
will not close fast enough, resulting in inefficient pump
operation.
3. At inlet fluid pressures greater than 15 psi (0.1 MPa, 1
bar), diaphragm life will be shortened.
4. See the Technical Data on page 24 for maximum
suction lift (wet and dry).