SP Pump Diagnostics and Repair
B-3
Part 1128350_02
E 2020 Nordson Corporation
Pump Isolation Valve
The isolation valve is used to prevent:
- material from the melt section (tank) from filling the pump cavity in the
manifold.
- material spillage when the pump is removed and replaced in cases
when the tank cannot be emptied beforehand.
Pressure Discharge Valve
The manifold is equipped with a pressure discharge valve. When the pump is
switchedoffatthecontrolpanel,airisremovedfromthetopofthevalve
causing it to open. When the valve opens, pressurized material within the
pumpandmanifoldisbypassedthrough the pressure discharge valve back
to the tank.
Single Acting Pump
A single acting pump delivers adhesive on the downward stroke and draws in
fresh adhesive from the melt section (tank) on the upward stroke.
A solenoid valve controls the pump by supplying compressed air to the air
motor. The customer must provide 24 VDC power to the solenoid valve.
When power is applied to the solenoid, the pump piston moves downward.
When the power is removed, the pump piston moves upward.
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