VALCO MELTON D-90, Manual

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5-44 Valco Cincinnati, Inc.
Section 5 – Setup MM125 - D-90 Hot Melt Unit
To adjust the single-stage relief valve, follow these steps:
CAUTION! CAUTION!
CAUTION! CAUTION!
CAUTION! Do not overtighten adjusting screw. Otherwise,
equipment damage could occur.
1. Turn the pump motor off.
2. Loosen the locknut on the pressure relief valve.
The physical location of these pressure
relief valves may be reversed in some
units.
3. Turn adjustment screw clockwise to increase pressure,
counterclockwise to decrease pressure.
4. Tighten the locknut on the pressure relief valve.
5. Turn on pump motor and resume operation.
Adjusting the
Pressure
Control Valve
Adjusting the Single-
Stage Relief Valve
The D-90 unit contains a single-stage, external, manually adjustable relief
valve (see figure below). Additionally, the D-90 unit can use an optional
pneumatic relief valve, Uniflow 12 and Uniflow 24V (contact Valco Melton for
details).
The single-stage relief valve is a simple safety device which protects the
system from excessive pressure. The single-stage relief valve is commonly
used for systems that are applying adhesive continuously (laminating).
WARNING! WARNING! WARNING! WARNING! WARNING! Do not adjust the fixed pressure relief valve. This
protects the system from excessive pressure buildup.
Otherwise, serious personal injury or equipment damage
could occur.