Adjusting The Pressure Relief Valve - ITW Dynatec DYNAMELT D15 Series Technical Documentation Manual

Page 3-10 Installation
Revised 10/14

Adjusting the Pressure Relief Valve

The function of the pressure relief valve is to protect the gear pump(s) and the pump drive compo-
nents from overload and to protect other components from potentially damaging pressure levels.
The system will allow pressures up to 1000 PSI, however, typical factory settings are 500 PSI.
WARNING HIGH PRESSURE, HOT ADHESIVE
NOTE: The following procedure
will require the hot melt adhesive
to be at a high temperature and
the application system to have
substantial pressure. Safety
glasses, insulated gloves and long-
To Adjust Pressure Relief:
Note: This adjustment should be done with a melt pressure gauge or a pressure transducer
installed. Failure to use proper equipment can result in excessive pressure levels.
The pressure relief valves are located on the filter manifolds, which are located under the rear
manifold cover(s), near where the hoses connect to the ASU.
1. Turn the application system ON and raise the temperatures of all components to normal operat-
ing temperatures.
Note: Position a heat-resistant bucket or other waste receptacle under the applicator(s) so that
adhesive will be collected during the adjustment procedure.
2. At the controller, set the motor speed to "0" so that the gear motor is not turning.
Note: If using a single pump or if using a dual pump with both output streams combined into one,
adjust one of the pressure relief valves fully clockwise to close it off and use the other valve to ad-
just that pump's pressure setting. If using a dual pump with
separate glue streams, set the pressure of each stream with
its respective pressure relief valve.
Reference Note #7 on page 10-3 regarding the plug that
separates the two pressure chambers, if using a dual pump.
This plug must be removed if combining dual streams into
one or if using a single output pump.
3. The pressure relief valve's adjustment screw is at the
top of the valve (see diagram). Turn the adjustment screw
counter-clockwise until it stops.
4. At the controller, turn the motor ON to its maximum
operating speed.
D15/D25/D45 V6 DCL ASU Manual #20-63
sleeved protective clothing must be worn
to prevent the possibility of serious injury
from the molten adhesive. Refer to
Chapter 1 and the section entitled
"SAFETY PRECAUTIONS" for further
details and First Aid information.
Adjustment screw
cont.
ITW Dynatec
Turning the
adjustment screw
counterclockwise
opens the outlet
and decreases the
pressure to the
hose.
Turning the
adjustment screw
clockwise closes
the outlet and
increases the
pressure to the
hose.
Pressure Relief Valve