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WILDEN PUMP & ENGINEERING CO.

SECTION 3

WILDEN MODEL T8 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

Nordel

–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

Teflon

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 components.
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 signifi-
cantly reduce maximum safe operating temperatures.
Consult engineering guide for chemical compatibility and
temperature limits.

CAUTION: Always wear safety glasses when operating
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: 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 5

(micron) air filter is

recommended.

NOTE: When installing Teflon

diaphragms, it is impor-

tant to tighten outer pistons simultaneously (turning in
opposite directions) to ensure tight fit.

NOTE: Tighten clamp bands and retainers prior to instal-
lation. Fittings may loosen during transportation.

NOTE: Before starting disassembly, mark a line from each
liquid chamber to its corresponding air chamber. This line
will assist in proper alignment during reassembly.

CAUTION: Verify the chemical compatibility of the
process and cleaning fluid to the pump’s component mate-
rials in the Chemical Resistance Guide (see E4).

NOTE: “Champ” series pumps are made of virgin plastic
and are not UV stabilized. Direct sunlight for prolonged
periods can cause deterioration of plastics.

CAUTION: When removing the end cap using
compressed air, the air valve end cap may come out with
considerable force. Hand protection such as a padded
glove or rag should be used to capture the end cap.

CAUTION: Only explosion proof (NEMA 7) solenoid
valves should be used in areas where explosion proof
equipment is required.

NOTE: Non lube-free pumps must be lubricated. Wilden
suggests an arctic ISO grade 15 (5 weight oil). Do not
over-lubricate air supply. Over-lubrication will reduce
pump performance.