Typical Applications; Working Principle; Technical Description - SPX Johnson Pump Manual Del Usuario

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Wash Down Systems 3.4 and 5.0 mounted to
DC motor 12/24 V

Typical applications

The WD 3.4 and the WD 5.0 are both five
chamber positive displacement diaphragm
pumps.
These pumps are the ideal choice for
wash down applications as they provide
5 bar pressure (70psi), making clean-up
faster and easier.
Features
• Quiet operation
• Smooth flowing
• Self priming
• Integrated pressure switch turns pump
on and off automatically when the
spray nozzle is opened and closed
• Dry running without damage
• Low power consumption
• Quick disconnect fittings

Working principle

As the pump runs, pressure builds until
reaching 5 bar/ 70 psi. At this point, the
integrated pressure switch automatically
shuts the pump off.
The pump is equipped with positively
checking outlet valves which ensure that
the pressure is maintained after the pump
shuts off.
When water is demanded the pressure
decreases. After a moderate drop in
pressure, the integrated pressure switch
automatically turns the pump back on.
Due to their durable construction and
thoughtful design, the WD 3.4 and the
WD 5.0 pumps will provide many years of
service.
Important! The pressure setting of this
pump is made at the factory. Warranty
invalidated by pressure switch inter-
ference.
8

Technical description

Body: Nylon
Valve housing: Polypropylene
Valves: Nitrile
Diaphragm: Santoprene
Connection: 3/8" BSP, 1/2" hose
(Ø 13 mm) or
US: 1/2" NPT, 3/4" hose
(Ø 13 mm)
US: 3/4" Garden hose
thread (GHT)
Max. liquid
temperature: Max +50°C/+120°F
Fasteners: Stainless steel
Max. suction lift: WD 3.4 – 2.5 m/8.2 ft
WD 5.0 – 3 m/9.8 ft
Cut in pressure: 3.7 Bar/54 psi
Cut-off pressure: 5 Bar/70 psi
Duty cycle: Intermittent,
max 20 min
Motor: WD 3.4 – 130 W
WD 5.0 – 185 W
12/24 V DC
with built in thermal
protection
The motor is ignition protected according
to ISO 8846 (Small craft
– Electrical devices – Protection against
ignition of surrounding flammable gases).
Type designation
See page 39
Original instructions