System Accessories - Graco 237-004 Instructions-Parts List Manual

NOTE: Reference numbers and letters in parentheses
in the text refer to the callouts in the figures and
the parts drawing.
If you supply your own accessories, be sure they
are adequately sized and pressure–rated to
meet the system's requirements.
The Typical Installation drawing on page 6 shows the
pump being used for continuous duty over extra long cir-
culating lines with multiple spray outlets. This drawing is
only a guide for selecting and installing system compo-
nents and accessories. Contact your Graco distributor
for help in designing a system to suit your particular
needs.

SYSTEM ACCESSORIES

Refer to the Typical Installation drawing on page 6.
WARNING
Two accessories are required in your system: a
bleed-type master air valve (C) and a fluid drain
valve (G). These accessories help reduce the risk
of serious injury including fluid injection, splashing
in the eyes or on the skin, and injury from moving
parts if you are adjusting or repairing the pump.
The bleed-type master air valve relieves air trapped
between this valve and the pump after the air is
shut off. Trapped air can cause the pump to cycle
unexpectedly. Locate the valve close to the pump.
The fluid drain valve assists in relieving fluid pres-
sure in the displacement pump, hose, and gun.
Triggering the gun to relieve pressure may not be
sufficient.
Mounting the Pump
Refer to the Dimensions on page 18, and mount the
pump to suit the type of installation planned. If you are us-
ing a wall bracket, be sure the wall is strong enough to
support the weight of the pump, bracket, accessories,
and operating stress.
Air Line Accessories
Install the following accessories in the order shown in the
Typical Installation, using adapters as necessary:
A pump runaway valve (A) senses when the pump
is running too fast and automatically shuts off the air to
the motor. A pump which runs too fast can be serious-
ly damaged. Install closest to the pump air inlet.
An air line lubricator (B) provides automatic air mo-
tor lubrication.
A bleed–type master air valve (C) is required in your
system to relieve air trapped between it and the air
Installation
motor when the valve is closed (see the WARNING at
left). Be sure the bleed valve is easily accessible from
the pump, and is located downstream from the air
regulator.
An air regulator (D) controls pump speed and outlet
pressure by adjusting the air pressure to the pump.
Locate the regulator close to the pump, but upstream
from the bleed–type master air valve.
An air line filter (E) removes harmful dirt and mois-
ture from the compressed air supply.
A second bleed–type air valve (C) isolates the air
line accessories for servicing. Locate upstream from
all other air line accessories.
When dropping the air line down from the main air supply,
always install plumbing in a vertical loop as shown in the
Typical Installation.
Fluid Supply Line Accessories
Install the following accessories in the positions shown in
the Typical Installation, using adapters as necessary:
A check valve (F) prevents backflow into the pump
when the pump is shut off.
A surge tank (H) with fluid filter reduces line pulsa-
tions and filters the fluid.
A fluid drain valve (G) is required in your system to
relieve fluid pressure in the hose and gun (see the
WARNING at left).
When dropping down to each gun station, install a
fluid shutoff valve (J) to isolate the station during
maintenance and repair.
Install a fluid pressure regulator (K) for precise con-
trol of pressure to the gun (L).
Fluid Return Line Accessories
Install the following accessories in the positions shown in
the Typical Installation, using adapters as necessary:
Install a back pressure regulator (M) after each gun
station to maintain constant back pressure in the sys-
tem.
Install a shutoff valve (J) after each back pressure
regulator to isolate the station for repair and mainte-
nance.
Pump Intake and Suction Line
In a circulating system such as that shown in the Typical
Installation, remove the intake elbow (8) supplied with the
pump and replace it with an intake manifold. Install a di-
rector valve (N) in the intake manifold. Connect the fluid
return line to the director valve. Connect a drain back
tube (S) to the branch of the director valve.
Connect the suction hose (P) to the pump intake or the
intake manifold. The suction tube (Q) should rest 1/2 in.
(13 mm) off the bottom of the supply container.
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