Equipment Familiarization 2-3
Hot melt adhesive pump
(continued)
AIR CYUNOER
I
CRosSCiVERlUf3E
Figure 2.2 -Air-Driven, Dual-Acting
Piston Pump During Upstroke
The pump delivers adhesive to the distribution manifold on both the
upstroke and the downstroke of the piston. On the upstroke (see Figure
2.2) compressed air enters the air cylinder below the air piston, forcing
it upward. As the attached pump shaft moves up, the large ball check
valve is lifted off its seat, sucking adhesive into the chamber from the
applicator tank. The small ball check valve remains on its seat during
this time because the pump shaft is moving up. The upward movement
of the plunger at the lower end of the pump shaft also pushes the
.
adhesive above it into the crossover tube and from there into the
distribution manifold.
In the downstroke of the pump (see Figure 2.3) compressed air enters
the air cylinder above the air piston, forcing it down. As the attached
pump shaft moves down, the adhesive pressure forces the large ball
check valve against its seat and the small ball check valve off its seat,
allowing the adhesive to move up the pump cylinder and into the
crossover tube. It then passes through a filter in the distribution
manifold and from there to the hose(s) and gun(s).
Overpressure protection is provided by a relief valve in the distribution
manifold. It opens at 1,500 psi (10.3 MPa) to relieve system pressure
by allowing adhesive back to the adhesive tank.
AIR CYLINDER-
AIR REDUIAT’CR
SWSINO DMC
DIREC’TlON OF TRAVEL -
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Piston Pump on Downstroke
0 Nordson Corporation 1994
AU Rights Reserved
P/N 106 701A
41-2300SP - Issued 1194
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