Constant Pressure (CP) Pump0 pages

Constant Pressure (CP) Pump
Pump maintains constant fluid pressure for superior performance
in automotive applications.
Features and Benefits
Overlapping pump stroke provides uniform and constant
pressure, eliminating fluctuations and pressure winks.
Independent output pressure is not affected by
inlet pressure. Uniform pressure provides smooth,
uninterrupted material application.
t Simple design facilitates quick replacement
of air valve and hydraulic packing glands for easy,
on-line maintenance.
t Self-starting inter-connection automatically initializes
both pumps whenever air pressure is activated.
The Nordson Constant Pressure (CP) Pump is an air-driven
pump used in the application of automotive adhesive and
sealant materials including high viscosity, cold-applied
plastisols, epoxies and body sealers. Designed for use in
demanding automotive production environments, the CP
pump provides superior flow and pressure control.
High-Performance Operation
The Nordson CP pump solves the problem of pressure
fluctuation seen in conventional double-acting pumps
by uniting two single-acting, air-powered hydraulic pumps
in a side-by-side configuration. One pump discharges while
the other pump fills. Less time is required for filling than
for discharging. As a result, one pump is filled and
remains in a ready state before the first pump has finished
discharging. Shifting from one pump to the other is
controlled to provide adequate overlap in the pump strokes,
eliminating pressure fluctuations.
In actual operation, pump A is activated, forcing the plunger
downward and discharging material through the outlet
check valve. When pump A approaches empty (or the end of
its discharge cycle), pump B is automatically activated and
begins supplying material. Pump A then refills and waits
until pump B is nearly empty to automatically activate and
begin the next cycle.
Ease of Maintenance
The CP pump is constructed for fast, easy and safe
maintenance. Components are simple in design and easily
accessible for ease of on-line routine servicing and reduced
maintenance costs.
Nordson FastPack™ replacement packings are supplied in
factoryassembled cartridges to provide a proper pump shaft
seal and to minimize downtime. The self-adjusting packing
gland does not require maintenance and eliminates failures
caused by over tightening.
Packing cartridge being removed with
screwdriver. Self-adjusting FastPack™
replacement packings are easy to
replace and do not require maintenance.