Graco Inc. 308178 - Manual (Page 6)

6 308178
Installation
General Information
The surge suppressor uses air pressure and a
diaphragm to maintain a consistent fluid outlet
pressure from a double diaphragm or low-pressure
reciprocating pump. During normal flow, the
suppressor air pressure and fluid pressure are in
equilibrium. A sharp increase in fluid pressure causes
the air inlet port to open, increasing air pressure on the
diaphragm and returning the system to equilibrium.
Conversely, a sharp decrease in fluid pressure causes
the air exhaust port to open, decreasing air pressure
on the diaphragm and allowing the system to return to
equilibrium.
Installation
1. Read this entire manual before installing or
operating the surge suppressor.
2. The surge suppressor fluid inlet must be
connected to the pump’s fluid outlet. If the pump
is aluminum or steel, the surge suppressor may
be plumbed directly to the outlet, using 3/4 npt
fittings. If the pump is acetal or polypropylene,
place the surge suppressor on the floor or some
other solid, level surface near the pump, and
connect the surge suppressor inlet to the pump
outlet with a 3/4” ID hose and 3/4 npt fittings.
CAUTION
Do not plumb the surge suppressor directly onto the
fluid outlet of an acetal or polypropylene pump.
Those pumps cannot support the weight of the
suppressor and will suffer damage or rupture.
3. Connect an air line from the pump’s air regulator to
the air inlet of the surge suppressor. In systems
using a 1:1 ratio pump, the air pressure supplied to
the suppressor will be the same as that supplied to
the pump.
4. Use a compatible, liquid thread sealant on all male
threads. Tighten all connections firmly to avoid air
or fluid leaks.
CAUTION
To avoid pump damage, do not overtighten the
fittings to the pump.
Air Exhaust Ventilation
WARNING
Be sure to read TOXIC FLUID HAZARD and FIRE
AND EXPLOSION HAZARD on page 3, before
operating this equipment.
Be sure the system is properly ventilated for your
type of installation. When pumping flammable or
hazardous fluids, you must vent the surge suppres-
sor exhaust air to a safe place, away from people,
animals, food handling areas, and all sources of
ignition. If the diaphragm ruptures, the fluid will be
exhausted along with the air. Place a container at
the end of the air exhaust line to catch the fluid.
See Detail A on page 5.
The minimum size for the air exhaust hose is 3/8 in.
(10 mm) ID x 15 ft (4.6 m). If a longer hose is required,
use a larger diameter hose.
1. Remove the muffler from the surge suppressor
exhaust port. Install an exhaust hose in the
exhaust port, and connect the muffler to the other
end of the hose. Avoid sharp bends or kinks in the
hose. See Detail A on page 5.
2. Place a container at the end of the air exhaust line
to catch fluid in case the diaphragm ruptures.
WARNING
Never operate the surge suppressor without the
muffler or an air exhaust line installed in the air
exhaust port. If the air exhaust port is left open and
the diaphragm shaft works loose from the bolt, the
shaft could be propelled out of the housing, caus-
ing injury.