ITW Dynatec c. 2004
DYNAMINI ASU Manual #20-25
Page 7-9
Revised 1/05
Pump Operation & Adjustable Pressure Relief
When the ASU’s hopper reaches setpoint, the controller places the hopper in “Ready” condition and
power is supplied to the pump.
An adjustable pressure relief valve is located on the output filter manifold.
When adhesive pressure exceeds the set limit, adhesive flows back to the hopper. Therefore, the
greater the setting on the pressure relief valve, the greater the adhesive output.
To change the setting of this valve, loosen the lock nut and turn the adjustment screw clockwise to
increase pressure or counterclockwise to decrease pressure. The relief valve is factory set at 27 bar
(400 psi) for gear pumps and 68 bar (1000 psi) for piston pumps.
Operation of the Adjustable Adhesive Pressure Relief Valve
Normally Closed (Unrelieved):
In the drawing below, the valve
is closed.
Open (Relieved):
In this drawing, pressure has
exceeded the setting of the valve,
causing the valve to open and
discharge adhesive to the hopper.
from
pump
Adhesive flow through
filter block to hose
return to
hopper
to
hose
from
pump
to
hose
Adhesive flow through
filter block to hose
Adjustment screw
Lock nut
Mounting nut
