Table of Contents
Advertisement
Pressure Relief Procedure
WARNING
MATERIAL FLUID HAZARD
To reduce risk of injury, wear eye
protection, gloves and protective clothing
when installing, operating, or servicing
this dispensing system.
INJECTION HAZARD
The system pressure must be manually
relieved to prevent the system from
starting or spraying accidentally. Fluid
under high pressure can be injected
through the skin and cause serious
injury. To reduce the risk of an injury
from injection, splashing fluid, or moving
parts, follow the Pressure Relief
Procedure whenever you:
D are instructed to relieve the pressure
D stop spraying/dispensing
D install or clean the nozzle
D check or service any of the system
equipment
PRESSURIZED FLUID HAZARD
High pressures can cause serious per-
sonal injury. Be sure to open the valve
during system start-up to alleviate
pressure which might occur in the sys-
tem due to material expansion.
This procedure describes how to relieve pressure from
the compact applicator. See your supply unit or sys-
tem documentation for instructions on relieving pres-
sure for the entire system. Use this procedure when-
ever you shut off the compact applicator and before
checking or adjusting any part of the system, to reduce
the risk of serious injury.
1. Shut off the material supply.
2. Shut off the conditioning unit to the automatic
dispense valve. See the conditioning-unit's docu-
mentation for more information.
3. Close all air bleed valves to shut off the air supply
to the applicator.
4. Actuate the applicator repeatedly until no fluid
flows. Have a container ready to catch the drain-
age from the applicator.
8
310557
Operation
5. If the compact applicator nozzle or fluid hose is
completely clogged or if pressure has not been
fully relieved after following the preceding steps,
very slowly loosen the hose coupling and relieve
pressure gradually, then loosen completely. Now
clear the nozzle or hose. Refer to page 11 for
Parts information.
How the Compact Applicator Operates
The compact applicator uses the air-opened, air-closed
mode of operation. The two 1/8 NPT air ports control
the movement of the air-operated, applicator needle
assembly inside the applicator. The applicator piston,
which is either lifted or pushed down when air is ap-
plied, controls material flow to the removable 1/4 NPT
nozzle adapter on the compact applicator.
A spring inside the applicator forces the applicator pis-
ton down and stops material flow in the event there is
a loss of controlling air pressure.
Adjusting the Compact Applicator
There are no adjustment controls on the compact ap-
plicator. If fluid begins to discharge, drip, string, or
weep irregularly from the fluid outlet port, or from the
0.25 diameter weep holes in the applicator body, the
compact applicator may require cleaning, servicing, or
replacement.
Applicator Inspection Frequency
Inspect the applicator, material, and air hoses at least
once every two weeks specifically for leakage and
other visible damage.
Nozzle Considerations
Nozzles installed at the outlet port of the compact
applicators may be used to accurately place, spread,
or otherwise shape the application of fluid material.
Without a nozzle, compact applicator 918623 may be
used as a general purpose fluid control valve, within its
operating limits. See Technical Data on page 15 for
more information.
Compact applicator 918625 is intended for use with
airless spray Reverse-A-Clean (RAC) nozzles or other
spray nozzles which can be mounted on the 7/8–14
UNF nozzle adapter/needle seat. RAC nozzles pro-
vide easy cleaning of nozzle clogs and permit wide
pattern application of thinner adhesive and sealant
fluid materials.
For specific nozzle information or nozzle selection
advice, contact your Graco distributor or call Graco
Technical Service.
Advertisement
Table of Contents
