Wilden A.025 Original Plastic, A.025B Original Plastic, A.025T Original Plastic, A.025P Original Plastic Series Manual
A.025
Original™ Series PLASTIC Pumps
Simplify your process
Engineering
Operation &
Maintenance
WIL-10020-E-06
REPLACES WIL-10020-E-05
TABLE OF CONTENTS
PAGE #
SECTION 1 — CAUTIONS — READ FIRST! .................................................. 1
SECTION 2 — PUMP DESIGNATION SYSTEM ......................................... 2
SECTION 3 — HOW IT WORKS (PUMP & AIR SYSTEMS) ............ 3
SECTION 4 — DIMENSIONAL DRAWINGS
A. A.025T PLASTIC (T-series Center Section) ....................................................................... 4
B. A.025B PLASTIC (Adapter Block with T-series Center Section) ....................................... 4
C. A.025P PLASTIC (P-series Center Section) ....................................................................... 5
D. A.025B PLASTIC (Adapter Block with P-series Center Section) ....................................... 5
SECTION 5 — PERFORMANCE CURVES
A. A.025T PLASTIC Rubber Fitted (T-series Center Section) ................................................ 6
B. A.025T PLASTIC PTFE Fitted (T-series Center Section) ................................................... 6
C. A.025P PLASTIC Rubber Fitted (P-series Center Section) ............................................... 7
D. A.025P PLASTIC PTFE Fitted (P-series Center Section) ................................................... 7
SECTION 6 — 70/30 OPERATING CONDITION
A. A.025T PLASTIC Rubber Fitted (T-series Center Section) ................................................ 8
A. A.025T PLASTIC PTFE Fitted (T-series Center Section) ................................................... 8
B. A.025P PLASTIC Rubber Fitted (P-series Center Section) ............................................... 8
B. A.025P PLASTIC PTFE Fitted (P-series Center Section) ................................................... 8
SECTION 7 — INSTALLATION & OPERATION
A. Installation .......................................................................................................................... 9
B. Operating Principles........................................................................................................... 10
C. Operation and Maintenance .............................................................................................. 10
D. Troubleshooting ................................................................................................................. 11
SECTION 8 — DIRECTIONS FOR DISASSEMBLY/REASSEMBLY
A. A.025T, A.025P and A.025B Wetted Path ......................................................................... 12
B. Reassembly Hints & Tips ................................................................................................... 15
SECTION 9 — EXPLODED VIEW/PARTS LISTING
A. A.025T PLASTIC (T-series Center Section) ....................................................................... 16
B. A.025P PLASTIC (P-series Center Section) ....................................................................... 18
SECTION 10 — ELASTOMER OPTIONS/ELECTRICAL INFORMATION
A. Elastomer Options ............................................................................................................. 20
B. Electrical Information ......................................................................................................... 20
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SECTION 1
A.025 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
Buna-N –12.2°C to 82.2°C 10°F to 180°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
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
(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 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.
®
has a maximum limit of 176.7°C
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: 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
materials in the Chemical Resistance Guide (see E4).
NOTE: Plastic series pumps are made of virgin plastic
and are not UV stabilized. Direct sunlight for prolonged
periods can cause deterioration of plastics.
CAUTION: The A.025 Pump is not submersible
WIL-10020-E-06 1 WILDEN PUMP & ENGINEERING CO.
SECTION 2
WILDEN PUMP DESIGNATION SYSTEM
A.025 ORIGINAL™
PLASTIC
6 mm (1/4") Pump
Maximum Flow Rate:
10.6 LPM (2.8 GPM)
LEGEND
A.025 X / XXXXX/ XXX / XX /XXX / XXXX
MODEL
MATERIAL CODES
AIR SYSTEM BASE TYPE
B = ADAPTER BLOCK
P = PRO-FLO
T = TURBO-FLO™
WETTED PARTS & OUTER PISTON
KK = PVDF / PVDF
KZ = PVDF / NO PISTON
PP = POLYPROPYLENE /
PZ = POLYPROPYLENE /
CENTER SECTION
PP = POLYPROPYLENE
®
POLYPROPYLENE
NO PISTON
DIAPHRAGMS
AIR VALVE
CENTER SECTION
WETTED PARTS & OUTER PISTON
AIR SYSTEM BASE TYPE
AIR VALVE
A = ALUMINUM
P = POLYPROPYLENE
U = UHMW (Available for A.025B
only)
DIAPHRAGMS
BNS = BUNA-N (Red Dot)
TNL = PTFE W/ NEOPRENE
BACK-UP O-RING,
IPD (White)
WFS = WIL-FLEX™ [Santoprene®
(Orange Dot)]
O-RINGS
VALVE SE AT
VALVE BALLS
VALVE SEAT
K = PVDF
P = POLYPROPYLENE
VALVE SEAT O-RING
BN = BUNA-N
TV = PTFE ENCAP. VITON
WF = WIL-FLEX™ [Santoprene
SPECIALTY
CODE
(if applicable)
®
®
]
SPECIALTY CODES
0150 Accu-Flo™, 24V DC coil
0151 Accu-Flo™, 24V AC / 12V DC coil
0153 Accu-Flo™, 24V AC / 12V DC x-proof coil
0154 Accu-Flo™, 24V DC x-proof coil
0155 Accu-Flo™, 110V coil
0156 Accu-Flo™, 110V AC x-proof coil
0157 Accu-Flo™, 24V DC x-proof coil, Intl.,
PTB approved
0169 Accu-Flo™, 110V AC coil,
PFA coated hardware
0170 Accu-Flo™, 110V AC x-proof coil,
PFA coated hardware
0180 Accu-Flo™, 24V AC / 12V DC coil,
PFA coated hardware
0181 Accu-Flo™, 24V AC / 12V DC x-proof coil,
PFA coated hardware
0184 Accu-Flo™, 24V DC coil, PFA coated hardware
0185 Accu-Flo™, 24V DC x-proof coil,
PFA coated hardware
NOTE: MOST ELASTOMERIC MATERIALS USE COLORED DOTS FOR IDENTIFICATION.
THE THREE ACCU-FLO™ OPTIONS AVAILABLE:
1. AxT: This is the same Accu-Flo™ configuration that has been
available from Wilden since March 1994. An aluminum solenoid
valve is attached directly to a T-series center section and the shaft/
inner piston configuration is altered.
2. AxP: This option uses a plastic (polypropylene or acetal) spacer
that is assembled between the Pro-Flo® air valve and the Pro-Flo®
center section. The same solenoid operator – coil assembly that is
found on AxT pumps is assembled on the plastic spacer discussed
above for electronic interface. This spacer combined with the
Pro-Flo® air valve replaces the aluminum air valve used in the AxT
with a more chemically resistant option. Spacers will be available
Viton is a registered trademark of DuPont Dow Elastomers.
in the 1/4-in, 1/2-in, and 1-in sizes. The use of the Pro-Flo® ADS
provides additional flow in most applications (refer to EOM for
details). The AxP provides the Pro-Flo® benefits of lower start-up
pressure, reduced blow-by, and increased life.
3. AxB: This option uses an Adapter Block in place of an air valve. A
user supplied, 4-way pneumatic valve must be used in conjunction
with this technology. This configuration enables the solenoid valve to
be remotely installed, preventing chemical attack in very aggressive
environments. Adapter Blocks are available for both the T and Pseries center sections in all pump sizes. (See EOM AxB for details.)
Note: The “x” in the above Accu-Flo™ descriptions are used in
place of a pump model size. See Pump Designation System chart
above.
WILDEN PUMP & ENGINEERING CO. 2 WIL-10020-E-06
SECTION 3
THE WILDEN PUMP — HOW IT WORKS
The Wilden diaphragm pump is an air-operated, positive displacement, self-priming pump. These drawings show the flow
pattern through the pump upon its initial stroke. It is assumed the pump has no fluid in it prior to its initial stroke.
RIGHT STROKE LEFT STROKE RIGHT STROKE
FIGURE 1 When the solenoid is energized, the air valve directs pressure to
the back side of diaphragm A. The
compressed air is applied directly to the
liquid column separated by elastomeric
diaphragms. The diaphragm acts as
a membrane between the compressed
air and the liquid, balancing the load
and removing mechanical stress from
the diaphragm. The compressed air
moves the diaphragm away from
the center section of the pump. The
opposite diaphragm is pulled in by
the shaft connected to the pressurized diaphragm. Diaphragm B is on its
suction stroke; air behind the diaphragm
has been forced out to the atmosphere
through the exhaust port. The movement of diaphragm B toward the center
section of the pump creates a vacuum
within chamber B. Atmospheric pressure forces fluid into the inlet manifold
forcing the inlet valve ball off of its seat.
Liquid is free to move past the inlet
valve ball and fill the liquid chamber (see
shaded area).
FIGURE 2 When the solenoid valve
is deenergized, the air valve redirects pressurized air to the back side
of diaphragm B. The pressurized air
forces diaphragm B away from the
center section while pulling diaphragm
A to the center section. Diaphragm B is
now on its discharge stroke. Diaphragm
B forces the inlet valve ball onto its seat
due to the hydraulic forces developed in
the liquid chamber and manifold of the
pump. These same hydraulic forces lift
the discharge valve ball off of its seat,
while the opposite discharge valve ball
is forced onto its seat, forcing fluid to
flow through the pump discharge. The
movement of diaphragm A toward the
center section of the pump creates a
vacuum within liquid chamber A. Atmospheric pressure forces fluid into the
inlet manifold of the pump. The inlet
valve ball is forced off of its seat allowing the fluid being pumped to fill the
liquid chamber.
FIGURE 3 Once the solenoid valve is
reenergized, the air is directed to the
back side of diaphragm A, which starts
diaphragm B on its exhaust stroke. As
the pump reaches its original starting
point, each diaphragm has gone through
one intake and one discharge stroke.
This constitutes one complete pumping cycle. The pump may take several
cycles to completely prime depending
on the conditions of the application.
WIL-10020-E-06 3 WILDEN PUMP & ENGINEERING CO.
SECTION 4A
DIMENSIONAL DRAWING
A.025T PLASTIC ACCU-FLO™
3 mm (1/8”)
BSP (FNPT) AIR
INTAKE
6 mm (1/4”) BSP
(FNPT) LIQUID INLET
A
A
P
F
T
R
E
C
B
L
K
M N
S
H
J
G
6 mm (1/4”) BSP
(FNPT) LIQUID
DISCHARGE
6 mm (1/4”)
BSP (FNPT) AIR
EXHAUST
D
DIMENSIONS
ITEM METRIC (mm) STANDARD (inch)
A 145 5.7
B 25 1.0
C 84 3.3
D 140 5.5
E 163 6.4
F 79 3.1
G 30 1.2
H 30 1.2
J 114 4.5
K 61 2.4
L 74 2.9
M 53 2.1
N 64 2.5
P 5 0.2
R 175 6.9
S 124 4.9
T 71 2.8
SECTION 4B
DIMENSIONAL DRAWING
A.025B PLASTIC ACCU-FLO™
(T-SERIES CENTER SECTION)
6 mm
(1/4”) BSP (FNPT)
LIQUID DISCHARGE
6 mm (1/4”)
BSP (FNPT)
AIR INLET
E
D
C
B
6 mm
(1/4”) BSP (FNPT)
LIQUID DISCHARGE
P
A
L
K
DIMENSIONS
G
F
H
J
ITEM METRIC (mm) STANDARD (inch)
A 145 5.7
B 25 1.0
C 74 2.9
D 94 3.7
E 140 5.5
F 163 6.4
G 30 1.2
H 30 1.2
J 114 4.5
K 61 2.4
L 74 2.9
M 53 2.1
N 64 2.5
P 5 0.2
N
M
WILDEN PUMP & ENGINEERING CO. 4 WIL-10020-E-06
SECTION 4C
DIMENSIONAL DRAWING
A.025B PLASTIC ACCU-FLO™
3 mm (1/8”)
BSP (FNPT)
AIR INLET
6 mm
(1/4”) BSP (FNPT)
LIQUID INLET
P
U
SECTION 4D
F
A
R
6 mm
(1/4”) BSP (FNPT)
LIQUID DISCHARGE
B
S
K
J
H
EXHAUST
E
G
D
C
M
N
T
L
DIMENSIONS
ITEM METRIC (mm) STANDARD (inch)
A 145 5.7
B 25 1.0
C 74 2.9
D 140 5.5
E 180 7.1
F 8 0.3
G 163 6.4
H 30 1.2
J 28 1.1
K 66 2.6
L 122 4.8
M 30 1.2
N 132 5.2
P 74 2.9
R 61 2.4
S 53 2.1
T 64 2.5
U 5 0.2
DIMENSIONAL DRAWING
A.025B PLASTIC ACCU-FLO™
(P-SERIES CENTER SECTION)
6 mm
(1/4”) BSP (FNPT)
LIQUID DISCHARGE
6 mm
(1/4”) BSP
(FNPT)
AIR INLET
F
E
D
C
B
6 mm
(1/4”) BSP (FNPT)
LIQUID INLET
R
A
M
L
P
N
G
H
J
K
DIMENSIONS
ITEM METRIC (mm) STANDARD (inch)
A 145 5.7
B 25 1.0
C 79 3.1
D 84 3.3
E 140 5.5
F 163 6.4
G 30 1.2
H 30 1.2
J 30 1.2
K 132 5.2
L 61 2.4
M 74 2.9
N 53 2.1
P 64 2.5
R 5 1.2
WIL-10020-E-06 5 WILDEN PUMP & ENGINEERING CO.
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