1
WILDEN PUMP & ENGINEERING, LLC
WIL-10070-E-03
SECTION 1
A2 PLASTIC
CAUTIONS – READ FIRST!
TEMPERATURE LIMITS:
Polypropylene
0°C to 79°C
32°F to 175°F
PVDF
–12°C to 107°C
10°F to 225°F
Neoprene
–17.8°C to 93.3°C
0°F to 200°F
Buna-N
–12.2°C to 82.2°C
10°F to 180°F
EPDM
–51.1°C to 137.8°C
–60°F to 280°F
Viton
®
–40°C to 176.7°C
–40°F to 350°F
Wil-Flex™
–40°C to 107.2°C
–40°F to 225°F
Polyurethane 12.2°C to 65.6°C
10°F to 150°F
Saniflex™
–28.9°C to 104.4°C
–20°F to 220°F
PTFE
4.4°C to 104.4°C
40°F to 220°F
CAUTION: When choosing pump materials, be sure
to check the temperature limits for all wetted compo-
nents. Example: Viton
has a maximum limit of 176.7°C
(350°F) but polypropylene has a maximum limit of only
79°C (175°F).
CAUTION: Maximum temperature limits are based
upon mechanical stress only. Certain chemicals will
significantly reduce maximum safe operating tempera-
tures. Consult engineering guide for chemical compat-
ibility and temperature limits.
CAUTION: Always wear safety glasses when operat-
ing pump. If diaphragm rupture occurs, material being
pumped may be forced out air exhaust.
WARNING: Prevention of static sparking — If static
sparking occurs, fire or explosion could result. Pump,
valves, and containers must be properly grounded when
handling flammable fluids and whenever discharge of
static electricity is a hazard.
CAUTION: Do not exceed 8.6 bar (125 psig) air supply
pressure.
CAUTION: Plastic series pumps are made of virgin
plastic and are not UV stabilized. Direct sunlight for
prolonged periods can cause deterioration of plastics.
CAUTION: Before any maintenance or repair is
attempted, the compressed air line to the pump should
be disconnected and all air pressure allowed to bleed
from pump. Disconnect all intake, discharge and air
lines. Drain the pump by turning it upside down and
allowing any fluid to flow into a suitable container.
CAUTION: Blow out air line for 10 to 20 seconds
before attaching to pump to make sure all pipe line
debris is clear. Use an in-line air filter. A 5µ (micron) air
filter is recommended.
NOTE: Tighten clamp bands and retainers prior to
installation. Fittings may loosen during transportation.
NOTE: When installing PTFE diaphragms, it is impor-
tant to tighten outer pistons simultaneously (turning in
opposite directions) to ensure tight fit.
NOTE: Before starting disassembly, mark a line from
each liquid chamber to its corresponding air chamber.
This line will assist in proper alignment during reas-
sembly.
CAUTION: Verify the chemical compatibility of the
process and cleaning fluid to the pump’s component
materials in the Chemical Resistance Guide (see RBG
E4).
CAUTION: Only explosion proof (NEMA 7) solenoid
valves should be used in areas where explosion proof
equipment is required.
CAUTION: Do not lubricate lube-free pumps.
CAUTION: The A2 pump is not submersible.
NOTE: When reinstalling the outer pistons, apply
two (2) drops of Loctite
®
246 to the shaft internal
threads before the diaphragm assembly.
