Wilden T4 PLASTIC Instruction Manual

EOM-T4&A4P 5/00
REPLACES EOM-M4P 9/99

WILDEN PUMP & ENGINEERING CO.
TABLE OF CONTENTS
PAGE #
SECTION #1 — PUMP DESIGNATION SYSTEM...................................... 1
SECTION #2 — HOW IT WORKS (PUMP & AIR SYSTEMS) ......... 2
SECTION #3 — CAUTIONS ......................................................................................... 3
SECTION #4 — DIMENSIONAL DRAWINGS
A. Mode T4 PLASTIC and UItrapure Air-Operated................................................................ 4
B. Mode A4 PLASTIC Accu-F o™.......................................................................................... 4
SECTION #5 — PERFORMANCE CUR ES
A. Mode T4 PLASTIC Rubber-Fitted...................................................................................... 5
B. Mode T4 PLASTIC U tra-F ex™-Fitted............................................................................... 5
C. Mode T4 PLASTIC TPE-Fitted........................................................................................... 6
D. Mode T4 PLASTIC Tef on®-Fitted....................................................................................... 6
E. Mode A4 PLASTIC Accu-F o™ TPE®-Fitted...................................................................... 7
F. Mode A4 PLASTIC Accu-F o™ TPE®-Fitted 70/30 Operating Condition........................... 7
G. Mode A4 PLASTIC Accu-F o™ Tef on®-Fitted.................................................................... 8
H. Mode A4 PLASTIC Accu-F o™ Tef on®-Fitted 70/30 Operating Condition........................ 8
SECTION #6 — SUCTION LIFT CUR ES & DATA
A. Mode T4 PLASTIC Air-Operated....................................................................................... 9
B. Mode A4 PLASTIC Accu-F o™.......................................................................................... 9
SECTION #7 — INSTALLATION & OPERATION
A. Insta ation — Turbo-F o™ Suggested Insta ation Drawing ............................................... 10
B. Air-Contro ed Operation & Maintenance............................................................................ 11
C. Princip es Behind Accu-Fo™ Pumps................................................................................. 12
D. Insta ation — Accu-Fo™ Pumps....................................................................................... 12
E. Accu-F o™ Operation & Maintenance................................................................................ 13
F. Troub eshooting — Turbo-F o™ Pumps.............................................................................. 14
G. Troub eshooting — Accu-Fo™ Pumps............................................................................... 14
SECTION #8 — DIRECTIONS FOR DISASSEMBLY/REASSEMBLY
A. Mode T4 PLASTIC Wetted Path — Too s Required, Torque Specs, Cautions .................. 15
B. Turbo-F o™ Air Va ve — Disassemb y, C eaning, Inspection ............................................. 18
C. Reassemby Hints & Tips.................................................................................................... 20
D. Gasket Kit Insta ation......................................................................................................... 21
SECTION #9 — EXPLODED IEW/PARTS LISTING
A. Mode T4 PLASTIC Rubber/TPE-Fitted.............................................................................. 22
B. Mode T4 PLASTIC and U trapure Tef on®-Fitted................................................................ 24
C. Mode A4 PLASTIC Accu-F o™.......................................................................................... 26
SECTION #10 — REFERENCE
A. Air-Operated E astomer Options......................................................................................... 28
B. Accu-F o™ E ectrica Reference......................................................................................... 28
C
l
a
s
s
I
&
I
I
O
z
o
n
e
D
e
p
l
e
t
i
n
g
S
u
b
s
t
a
n
c
e
s
NON
USE
U.S. Clean Air Act
Amendments of 1 0

1WILDEN PUMP & ENGINEERING CO.
In the case where a center section is used instead of a center block and air chambers,
the designation will be as follows: Polypropylene = PP
O-RIN S
VALVE SEAT
VALVE BALLS
DIAPHRA MS
AIR VALVE
CENTER BLOCK OR CENTER SECTION
AIR CHAMBERS OR CENTER SECTION
WETTED PARTS
SPECIALTY
CODE
(IF APPLICABLE)
MODEL
T or A4 / XXXX / XX / XX / XXX / (xxx)
SECTION 1
WILDEN PUMP DESIGNATION SYSTEM
WETTED PARTS
K = KYNAR/PVDF
P = POLYPROPYLENE
T = TEFLON®PFA
DIAPHRA MS
BN = BUNA-N®(Red Dot)
FG = SANIFLEX™
ND = NORDEL®
NE = NEOPRENE
PU = POLYURET ANE
TF = TEFLON®PTFE
VT = VITON®
WF = WIL-FLEX™ (Orange)
VALVE BALL
BN = BUNA-N®(Red Dot)
FG = SANIFLEX™
FV = FOOD GRADE VITON®
ND = NORDEL®(Blue)
NE = NEOPRENE (Green)
PU = POLYURET ANE
TF = TEFLON®PTFE (White)
VT = VITON®(Silver or White Dot)
WF = WIL-FLEX™ (Orange)
VALVE SEAT O-RIN
BN = BUNA-N®
PU = POLYURET ANE
TV = TEFLON®ENCAP. VITON®
VALVE SEAT
K = KYNAR/PVDF
P = POLYPROPYLENE
T = TEFLON®PFA
CENTER SECTION
A = ALUMINUM
C = TEFLON®-COATED
N = NICKEL-PLATED
P = POLYPROPYLENE
AIR VALVE
A = ALUMINUM
(ACCU-FLO™ ONLY)
B = BRASS
C = TEFLON®-COATED
D = BRASS W/OIL BOTTLE
N = NICKEL-PLATED
S = STAINLESS STEEL
AIR CHAMBERS
C = TEFLON®-COATED
M = MILD STEEL
N = NICKEL-PLATED
P = POLYPROPYLENE
NOTE: ELASTOMERIC MATERIALS USE COLORED DOTS FOR IDENTIFICATION.
Buna-N, Nordel and Viton are registered trademarks of DuPont Dow Elastomers.
Teflon is a registered trademark of DuPont.
*O-RINGS NOT REQUIRED.
MODEL T4 OR A4 PLASTIC
MATERIAL CODES

2
WILDEN PUMP & ENGINEERING CO.
SECTION 2
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.
FIGURE 1 The air va ve directs pres-
surized air to the back side of diaphragm
A.The compressed air is appied direct y
to the iquid coumn separated by e as-
tomeric diaphragms.The diaphragm acts
as a separation membrane between the
compressed air and iquid, baancing the
oad and removing mechanica stress
from the diaphragm.The compressed air
moves the diaphragm away from the
center bock of the pump. The opposite
diaphragm is pu ed 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 of the pump.The movement
of diaphragm B toward the center b ock
of the pump creates a vacuum within
chamber B.Atmospheric pressure forces
f uid into the in et manifo d forcing the
in et vave ba off its seat.Liquid is free to
move past the in et vave ba and fi the
iquid chamber (see shaded area).
FIGURE 2 When the pressurized
diaphragm, diaphragm A, reaches the
imit of its discharge stroke, the air va ve
redirects pressurized air to the back side
of diaphragm B. The pressurized air
forces diaphragm B away from the center
bock whie pu ing diaphragm A to the
center bock. Diaphragm B is now on its
discharge stroke. Diaphragm B forces
the in et va ve ba onto its seat due to the
hydrau ic forces deve oped in the iquid
chamber and manifo d of the pump.
These same hydrau ic forces ift the
discharge va ve ba off its seat, whi e the
opposite discharge vave ba is forced
onto its seat, forcing f uid to f ow through
the pump discharge. The movement of
diaphragm A toward the center b ock of
the pump creates a vacuum within iquid
chamber A.Atmospheric pressure forces
f uid into the in et manifod of the pump.
The in et va ve ba is forced off its seat
a owing the fuid being pumped to fi the
iquid chamber.
FIGURE 3 At competion of the stroke,
the air va ve again redirects air to the
back side of diaphragm A, which starts
diaphragm B on its exhaust stroke. As
the pump reaches its origina starting
point, each diaphragm has gone through
one exhaust and one discharge stroke.
This constitutes one compete pumping
cyc e.The pump may take severa cyc es
to competey prime depending on the
conditions of the appication.
OPEN
CLOSED
CLOSED
OPEN
INLET
AIR SUPPLY
OUTLET
A
B
OPEN
OPEN
CLOSED
INLET
AIR SUPPLY
OUTLET
CLOSED
A
B
➤
➤
OPEN
CLOSED
CLOSEDOPEN
INLET
AIR SUPPLY
OUTLET
A
B
RI HT STROKE MID STROKE LEFT STROKE

3WILDEN PUMP & ENGINEERING CO.
SECTION 3
WILDEN MODEL T4 PLASTIC
CAUTIONS – READ FIRST!
TEMPERATURE LIMITS:
Po ypropyene 0°C to 79°C 32°F to 175°F
PVDF –12°C to 107°C 10°F to 225°F
Tef on®PFA –28.9°C to 107°C –20°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
Norde ®–51.1°C to 137.8°C –60°F to 280°F
Viton®–40°C to 176.7°C –40°F to 350°F
Wi -F ex™ –40°C to 107.2°C –40°F to 225°F
Po yurethane 12.2°C to 65.6°C 10°F to 150°F
Sanif ex™ –28.9°C to 104.4°C –20°F to 220°F
Tef on®PTFE 4.4°C to 104.4°C 40°F to 220°F
CAUTION: When choosing pump materia s, be sure to
check the temperature imits for a wetted components.
Examp e: Viton®has a maximum imit of 176.7°C (350°F)
but poypropy ene has a maximum imit of on y 79°C
(175°F).
CAUTION: Maximum temperature imits are based upon
mechanica stress ony. Certain chemica s wi signifi-
cant y reduce maximum safe operating temperatures.
Consu t engineering guide for chemica compatibi ity and
temperature imits.
CAUTION: A ways wear safety g asses when operating
pump. If diaphragm rupture occurs, materia being
pumped may be forced out air exhaust.
WARNING: Prevention of static sparking — If static
sparking occurs, fire or exp osion cou d resu t. Pump,
vaves, and containers must be proper y grounded when
hand ing f ammabe fuids and whenever discharge of
static eectricity is a hazard.
CAUTION: Do not exceed 8.6 Bar (125 psig) air supp y
pressure.
CAUTION: “Champ” series pumps are made of virgin
p astic and are not UV stabi ized. Direct sun ight for
pro onged periods can cause deterioration of p astics.
CAUTION: Before any maintenance or repair is
attempted, the compressed air ine to the pump shou d be
disconnected and a air pressure a owed to beed from
pump.Disconnect a intake, discharge and air ines.Drain
the pump by turning it upside down and a owing any f uid
to fow into a suitabe container.
CAUTION: B ow out air ine for 10 to 20 seconds before
attaching to pump to make sure a pipe ine debris is
c ear. Use an in- ine air fiter. A 5µ(micron) air fi ter is
recommended.
NOTE: Tighten c amp bands and retainers prior to insta -
ation. Fittings may oosen during transportation.
NOTE: When insta ing Tef on®diaphragms, it is impor-
tant to tighten outer pistons simu taneous y (turning in
opposite directions) to ensure tight fit.
NOTE: Before starting disassemb y, mark a ine from
each iquid chamber to its corresponding air chamber.This
ine wi assist in proper a ignment during reassemby.
CAUTION: Verify the chemica compatibi ity of the
process and c eaning fuid to the pump’s component mate-
ria s in the Chemica Resistance Guide (see E4).
CAUTION: When removing the end cap using
compressed air, the air va ve end cap may come out with
considerabe force. Hand protection such as a padded
g ove or rag shou d be used to capture the end cap.
NOTE: Non ube-free pumps must be ubricated. Wi den
suggests an arctic 5 weight oi (ISO grade 15). Do not
over- ubricate air supp y. Over- ubrication wi reduce
pump performance.
CAUTION: On y exp osion proof (NEMA 7) so enoid
vaves shoud be used in areas where exp osion proof
equipment is required.

4
WILDEN PUMP & ENGINEERING CO.
SECTION 4A
DIMENSIONAL DRAWING
WILDEN MODEL T4 PLASTIC CHAMP AND
ULTRAPURE
19.1 mm
(3/4") FNPT
EXHAUST
9.5 mm
(3/8") FNPT
AIR INLET
R
P
M
L
FLANGE
150 POUND CLASS
38.1 mm
(1 1/2") I.D.
S
H
EG
F
D
C
B
A
J
K
N
DIMENSIONS – T4 (PLASTIC)
ITEM METRIC (mm) STANDARD (inch)
A 393.7 15 1/2
B 79.4 3 1/8
C 463.6 18 1/4
D 527.1 20 3/4
E 304.8 12
F 120.7 4 3/4
G 269.1 10 19/32
284.2 11 3/16
J 287.4 11 5/16
K 237.3 9 11/32
L 181.0 7 1/8
M 204.8 8 1/16
N 11.9 15/32
P 55.2 RAD. 1 15/16 RAD.
R 75.2 RAD. 2 1/2 RAD.
S 18.0 DIA. 9/16 DIA.
SECTION 4B
DIMENSIONAL DRAWING
WILDEN MODEL A4 PLASTIC ACCU-FLO™
0 1
A
FLANGE
12.7 mm
(1/2" FNPT)
AIR INLET
19.1 mm
(3/4") FNPT
EXHAUST
B
CC
D
E
F
G
H
J
S
T
R
K
L
P
M
N
DIMENSIONS – T4 ACCU-FLO™ (PLASTIC)
ITEM METRIC (mm) STANDARD (inch)
A 393.7 15 1/2
B 79.4 3 1/8
C 269.1 10 19/32
D 463.6 18 1/4
E 527.1 20 3/4
F 95.3 3 3/4
G 120.7 4 3/4
269.1 10 19/32
J 284.2 11 3/16
K 287.4 11 5/16
L 237.3 9 11/32
M 181.0 7 1/8
N 204.8 8 1/16
P 11.9 15/32
R 55.2 RAD. 1 15/16 RAD.
S 75.2 RAD. 2 1/2 RAD.
T 18.0 DIA. 9/16 DIA.

5WILDEN PUMP & ENGINEERING CO.
SECTION 5A
PERFORMANCE CURVES
MODEL M4 PLASTIC RUBBER-FITTED
eight ............................527.1 mm (203⁄4")
Width .............................393.7 mm (151⁄2")
Depth.............................284.2 mm (113⁄16")
Ship Weight ....Polypropylene 17.5 kg (38 lbs.)
PVDF 22.5 kg (49 lbs.)
Teflon®PFA 23.9 kg (52 lbs.)
Air Inlet ..................................9.5 mm (3⁄8")
Inlet .....................................3.81 cm (11⁄2")
Outlet...................................3.81 cm (11⁄2")
Suction Lift .....................5.49 m Dry (18')
8.53 m Wet (28')
Displacement per
Stroke ...................... 1.02 l (0.27 gal.)1
Max. Flow Rate........287.69 lpm (76 gpm)
Max. Size Solids....................4.8 mm (3⁄16")
1Displacement per stroke was calculated at 4.8
Bar (70 psig) air inlet pressure against a 2 Bar
(30 psig) head pressure.
Example: To pump 159 lpm (42 gpm)
against a discharge pressure head of 2.7
Bar (40 psig) requires 4.1 Bar (60 psig)
and 40.8 Nm3/h (24 scfm) air consump-
tion. (See dot on chart.)
Caution: Do not exceed 8.6 Bar (125 psig) air
supply pressure.
Flow rates indicated on chart were determined by pumping water.
For optimum life and performance, pumps should be specified so that daily operation
parameters will fall in the center of the pump performance curve.
10 20 30 40 50 60 70 80 90
PSIG
20
40
60
80
100
120
FEET
0
25
50
75
100
125
150
175
200
225
250
275
300
BAR
0
1
2
3
4
5
6
7
8
(10) [17]
(40) [68]
(60) [102]
(50) [85]
(30) [52]
GPM
[l/min]
Water Discharge Flowrates
[76] [151][114] [189] [227] [265] [303]
Discharge Pressure
[340]
(20) [34]
[38]
AIR CONSUMPTION
(SCFM) [Nm3/h]
SECTION 5B
PERFORMANCE CURVES
MODEL M1 PLASTIC ULTRA-FLE ™-FITTED
eight ............................527.1 mm (203⁄4")
Width .............................393.7 mm (151⁄2")
Depth.............................284.2 mm (113⁄16")
Ship Weight ....Polypropylene 17.5 kg (38 lbs.)
PVDF 22.5 kg (49 lbs.)
Teflon®PFA 23.9 kg (52 lbs.)
Air Inlet ..................................9.5 mm (3⁄8")
Inlet .....................................3.81 cm (11⁄2")
Outlet..................................3.81 mm (11⁄2")
Suction Lift .....................4.88 m Dry (16')
8.23 m Wet (27')
Displacement per
Stroke ........................ .68 l (0.18 gal.)1
Max. Flow Rate..........234.7 lpm (62 gpm)
Max. Size Solids....................4.8 mm (3⁄16")
1Displacement per stroke was calculated at 4.8
Bar (70 psig) air inlet pressure against a 2 Bar
(30 psig) head pressure.
Example: To pump 132.5 lpm (35 gpm)
against a discharge pressure head of 2.7
Bar (40 psig) requires 4.1 Bar (60 psig)
and 51 Nm3/h (30 scfm) air consumption.
(See dot on chart.)
Caution: Do not exceed 8.6 Bar (125 psig) air
supply pressure.
Flow rates indicated on chart were determined by pumping water.
For optimum life and performance, pumps should be specified so that daily operation
parameters will fall in the center of the pump performance curve.
AIR CONSUMPTION
(SCFM) [Nm3/h]
10 20 30 40 50 60 70 80 90
PSIG
20
40
60
80
100
120
FEET
0
25
50
75
100
125
150
175
200
225
250
275
300
BAR
0
1
2
3
4
5
6
7
8
(10) [17]
(40) [68]
(60) [102]
(30) [52]
(50) [85]
GPM
[l/min]
Water Discharge Flowrates
[76] [151] [227] [303][189] [265][114]
Discharge Pressure
[340]
(20) [34]
[38]

6
WILDEN PUMP & ENGINEERING CO.
SECTION 5C
PERFORMANCE CURVES
MODEL T4 PLASTIC TPE-FITTED
eight ............................527.1 mm (203⁄4")
Width .............................393.7 mm (151⁄2")
Depth.............................284.2 mm (113⁄16")
Ship Weight ....Polypropylene 17.5 kg (38 lbs.)
PVDF 22.5 kg (49 lbs.)
Teflon®PFA 23.9 kg (52 lbs.)
Air Inlet ..................................9.5 mm (3⁄8")
Inlet .....................................3.81 cm (11⁄2")
Outlet..................................3.81 mm (11⁄2")
Suction Lift .....................4.27 m Dry (14')
8.23 m Wet (27')
Displacement per
Stroke ...................... 1.17 l (0.31 gal.)1
Max. Flow Rate..........306.6 lpm (81 gpm)
Max. Size Solids....................4.8 mm (3⁄16")
1Displacement per stroke was calculated at 4.8
Bar (70 psig) air inlet pressure against a 2 Bar
(30 psig) head pressure.
Example: To pump 143.9 lpm (38 gpm)
against a discharge pressure head of 2.7
Bar (40 psig) requires 4.1 Bar (60 psig)
and 35.7 Nm3/h (21 scfm) air consump-
tion. (See dot on chart.)
Caution: Do not exceed 8.6 Bar (125 psig) air
supply pressure.
Flow rates indicated on chart were determined by pumping water.
For optimum life and performance, pumps should be specified so that daily operation
parameters will fall in the center of the pump performance curve.
AIR CONSUMPTION
(SCFM) [Nm3/h]
10 20 30 40 50 60 70 80 90
PSIG
20
40
60
80
100
120
FEET
0
25
50
75
100
125
150
175
200
225
250
275
300
BAR
0
1
2
3
4
5
6
7
8
(10) [17]
(40) [68]
(60) [102]
(30) [52]
(50) [85]
GPM
[l/min]
Water Discharge Flowrates
[76] [151] [227] [303][189] [265][114]
Discharge Pressure
[340]
(20) [34]
[38]
SECTION 5D
PERFORMANCE CURVES
MODEL T4 PLASTIC TEFLON®-FITTED
eight ............................527.1 mm (203⁄4")
Width .............................393.7 mm (151⁄2")
Depth.............................284.2 mm (113⁄16")
Ship Weight ....Polypropylene 17.5 kg (38 lbs.)
PVDF 22.5 kg (49 lbs.)
Teflon®PFA 23.9 kg (52 lbs.)
Air Inlet ..................................9.5 mm (3⁄8")
Inlet .....................................3.81 cm (11⁄2")
Outlet..................................3.81 mm (11⁄2")
Suction Lift .......................2.74 m Dry (9')
8.53 m Wet (28')
Displacement per
Stroke ...........................53 l (0.14 gal.)1
Max. Flow Rate..........234.7 lpm (62 gpm)
Max. Size Solids....................4.8 mm (3⁄16")
1Displacement per stroke was calculated at 4.8
Bar (70 psig) air inlet pressure against a 2 Bar
(30 psig) head pressure.
Example: To pump 94.6 lpm (25 gpm)
against a discharge pressure head of 2.7
Bar (40 psig) requires 4.1 Bar (60 psig)
and 51 Nm3/h (30 scfm) air consumption.
(See dot on chart.)
Caution: Do not exceed 8.6 Bar (125 psig) air
supply pressure.
Flow rates indicated on chart were determined by pumping water.
For optimum life and performance, pumps should be specified so that daily operation
parameters will fall in the center of the pump performance curve.
AIR CONSUMPTION
(SCFM) [Nm3/h]
10 20 30 40 50 60 70 80 90
PSIG
20
40
60
80
100
120
FEET
0
25
50
75
100
125
150
175
200
225
250
275
300
BAR
0
1
2
3
4
5
6
7
8
(10) [17]
(40) [68]
(60) [102]
(30) [52]
(50) [85]
GPM
[l/min]
Water Discharge Flowrates
[76] [151] [227] [303][189] [265][114]
Discharge Pressure
[340]
(20) [34]
[38]

A4 Plastic Accu-Flo™ TPE-fitted
@ 70 / 30 operating condition
Water Discharge Flowrate
5 101520253035
Speed
0
20
40
60
80
100
120
140
160
180
200
220
240
GPM
[l/min] [38] [57][19] [76] [95]
SPM
[114] [132]
7WILDEN PUMP & ENGINEERING CO.
SECTION 5E
PERFORMANCE CURVES
MODEL A4 PLASTIC ACCU-FLO™
TPE-FITTED
eight ............................527.1 mm (203⁄4")
Width .............................393.7 mm (151⁄2")
Depth.............................284.2 mm (113⁄16")
Ship Weight .Polypropylene 16.2 kg (35.6 lbs.)
PVDF 21.1 kg (46.6 lbs.)
Teflon®PFA 22.5 kg (49.6 lbs.)
Air Inlet ..................................9.5 mm (3⁄8")
Inlet .....................................3.81 cm (11⁄2")
Outlet..................................3.81 mm (11⁄2")
Suction Lift .....................3.66 m Dry (12')
8.84 m Wet (29')
Displacement per
Stroke ........................ .87 l (0.23 gal.)1
Max. Flow Rate..........234.7 lpm (62 gpm)
Max. Size Solids...................6.35 mm (1⁄4")
1Displacement per stroke was calculated at 4.8
Bar (70 psig) air inlet pressure against a 2 Bar
(30 psig) head pressure.
Example: To pump 90.85 lpm (24 gpm)
against a discharge pressure head of 2.7
Bar (40 psig) requires 4.1 Bar (60 psig),
17 Nm3/h (14 scfm) air consumption, and
a pump speed of 120 strokes/minute. (See
dot on chart.)
Caution: Do not exceed 8.6 Bar (125 psig) air
supply pressure.
Flow curves are for “optimal speed” conditions only. The “optimal speed” is that speed which
provides the maximum flow under a particular air and fluid pressure condition. The optimal
speed varies for different fluid and air pressures. Recommendations for optimal speed can be
found on the right side of the flow curve.
Flow rates indicated on chart were determined by pumping water.
For optimum life and performance, pumps should be specified so that daily operation
parameters will fall in the center of the pump performance curve.
AIR CONSUMPTION
(SCFM) [Nm3/h]
10 20 30 40 50 60 70 80 90
PSIG
20
40
60
80
100
120
FEET
0
25
50
75
100
125
150
175
200
225
250
275
300
BAR
0
1
2
3
4
5
6
7
8
Optimal Speed
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
GPM
[l/min]
Water Discharge Flowrates
[76] [151][114] [189] [227] [265] [303]
Discharge Pressure
[340][38]
Sec / Stroke
Interval
[150]
[120]
[100]
[86]
[75]
[67]
[SPM]
[60]
[200]
(10) [17]
(30) [52]
(20) [34]
SECTION 5F
70/30 OPERATING CONDITION
MODEL A4 PLASTIC ACCU-FLO™
TPE-FITTED
This curve demonstrates the flow
created when the stroke rate is modi-
fied under a static air and fluid pres-
sure condition. This curve can be
applied to different pressure condi-
tions to estimate the change in flow
due to stroke rate.

8
WILDEN PUMP & ENGINEERING CO.
SECTION 5G
PERFORMANCE CURVES
MODEL A4 PLASTIC ACCU-FLO™
TEFLON®-FITTED
eight ............................527.1 mm (203⁄4")
Width .............................393.7 mm (151⁄2")
Depth.............................284.2 mm (113⁄16")
Ship Weight .Polypropylene 16.2 kg (35.6 lbs.)
PVDF 21.1 kg (46.6 lbs.)
Teflon®PFA 22.5 kg (49.6 lbs.)
Air Inlet ..................................9.5 mm (3⁄8")
Inlet .....................................3.81 cm (11⁄2")
Outlet..................................3.81 mm (11⁄2")
Suction Lift .......................2.13 m Dry (7')
8.84 m Wet (29')
Displacement per
Stroke ........................ .42 l (0.11 gal.)1
Max. Flow Rate........143.85 lpm (38 gpm)
Max. Size Solids....................4.8 mm (3⁄16")
1Displacement per stroke was calculated at 4.8
Bar (70 psig) air inlet pressure against a 2 Bar
(30 psig) head pressure.
Example: To pump 38 lpm (10 gpm)
against a discharge pressure head of 2.7
Bar (40 psig) requires 4.1 Bar (60 psig),
17 Nm3/h (10 scfm) air consumption, and
a pump speed of 115 strokes/minute. (See
dot on chart.)
Caution: Do not exceed 8.6 Bar (125 psig) air
supply pressure.
Flow curves are for “optimal speed” conditions only. The “optimal speed” is that speed which
provides the maximum flow under a particular air and fluid pressure condition. The optimal
speed varies for different fluid and air pressures. Recommendations for optimal speed can be
found on the right side of the flow curve.
Flow rates indicated on chart were determined by pumping water.
For optimum life and performance, pumps should be specified so that daily operation
parameters will fall in the center of the pump performance curve.
AIR CONSUMPTION
(SCFM) [Nm3/h]
10 20 30 40 50 60 70 80 90
PSIG
20
40
60
80
100
120
FEET
0
25
50
75
100
125
150
175
200
225
250
275
300
BAR
0
1
2
3
4
5
6
7
8
Optimal Speed
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
(10) [17]
(30) [52]
GPM
[l/min]
Water Discharge Flowrates
[76] [151][114] [189] [227] [265] [303]
Discharge Pressure
[340]
(20) [34]
[38]
Sec / Stroke
Interval
[150]
[120]
[100]
[86]
[75]
[67]
[SPM]
[60]
[200]
SECTION 5H
70/30 OPERATING CONDITION
MODEL A4 PLASTIC ACCU-FLO™
TEFLON®-FITTED
A4 Plastic Accu-Flo™ Teflon®-fitted
@ 70 / 30 operating condition
Water Discharge Flowrate
5 101520253035
Speed
0
20
40
60
80
100
120
140
160
180
200
220
240
GPM
[l/min] [38] [57][19] [76] [95]
SPM
[114] [132]
This curve demonstrates the flow
created when the stroke rate is modi-
fied under a static air and fluid pres-
sure condition. This curve can be
applied to different pressure condi-
tions to estimate the change in flow
due to stroke rate.

9WILDEN PUMP & ENGINEERING CO.
The solenoid was running at 150 strokes / minute.
Actual suction lift may vary with different pump speeds.
A4 Plastic Accu-Flo™
Suction Lift Capability
0 102030405060708090100
Dry Vacuum
0
2
4
6
8
10
12
14
16
18
20
22
24
26
Meter
0
1
2
3
4
5
6
7
FT H2O
Rubber/TPE
Diaphragms
[.7] [1.4] [2] [2.7] [3.4] [4.1] [4.8] [5.5] [6.2] [6.9]
PSIG
[BAR]
Inlet Air Pressure
Ultraflex™/Teflon®Diaphragms
Suction ift curves are ca ibrated for pumps operating at 305 m
(1,000') above sea eve .This chart is meant to be a guide on y.
There are many variabes which can affect your pump’s operat-
ing characteristics.The number of intake and discharge ebows,
viscosity of pumping fuid, e evation (atmospheric pressure) and
pipe friction oss a affect the amount of suction ift your pump
wi attain.
Inlet Air Pressure
0 102030405060708090100
Dry Vacuum
0
2
4
6
8
10
12
14
16
18
20
24
26
Meter
0
1
2
3
4
5
6
7
Rubber Diaphragms
Ultra-Flex™
Diaphragms
FT H20
TPE Diaphragms
Teflon®Diaphragms
PSIG
[Bar] [.7] [1.4] [2] [2.7] [3.4] [4.1] [4.8] [5.5] [6.2] [6.9]
22
T4 Plastic Suction Lift Capability
Suction ift curves are ca ibrated for pumps operating at 305 m
(1,000') above sea eve .This chart is meant to be a guide on y.
There are many variabes which can affect your pump’s operat-
ing characteristics.The number of intake and discharge ebows,
viscosity of pumping fuid, e evation (atmospheric pressure) and
pipe friction oss a affect the amount of suction ift your pump
wi attain.
SECTION 6A – AIR-CONTROLLED
SUCTION LIFT CURVES & DATA
SECTION 6B – ACCU-FLO™
SUCTION LIFT CURVES & DATA

10
WILDEN PUMP & ENGINEERING CO.
SECTION 7A
INSTALLATION – T4 PLASTIC
AIR-OPERATED PUMPS
The Mode T4 P astic pump has a 3.81 cm (11⁄2") inet and 3.81
cm (11⁄2") out et and is designed for fows to 306.6 pm (81 gpm).
A variety of diaphragms, va ve ba s, va ve seats, and
O-rings are avaiab e to satisfy temperature, chemica compati-
bi ity, abrasion and f ex concerns.
The suction pipe size shou d be at east 3.81 cm (11⁄2") diameter
or arger if highy viscous materia is being pumped.The suction
hose must be non-co apsibe, reinforced type as the T4 is capa-
be of pu ing a high vacuum.Discharge piping shou d be at east
3.81 cm (11⁄2"); arger diameter can be used to reduce friction
osses.It is critica that a fittings and connections are airtight or
a reduction or oss of pump suction capabi ity wi resu t.
For T4 Champ mode s, Widen offers 150 b. standard or metric
f anges. The fo owing detai s shoud be noted when mating
these to pipe works:
• A 60–80 shore gasket that covers the entire fange face
shou d be used.
• The gasket shou d be between .075" and .175" thickness.
• Mating fanges with f at as opposed to raised surfaces shou d
be used for proper mechanica sea ing.
• The f anges shoud be tightened to a minimum of 6.8 m-N (5
ft.- bs.) but no more than 13.5 m-N (10 ft.- bs.).
A non-raised surfaced-fange adapter shoud be uti ized when
mating to the pump’s in et and discharge manifods for proper
sea ing.
INSTALLATION: Months of carefu p anning, study, and se ec-
tion efforts can resu t in unsatisfactory pump performance if
insta ation detai s are eft to chance.
Premature fai ure and ong term dissatisfaction can be avoided
if reasonab e care is exercised throughout the insta ation
process.
LOCATION: Noise, safety, and other ogistica factors usua y
dictate that “uti ity” equipment be situated away from the produc-
tion f oor.Mutipe insta ations with conf icting requirements can
resu t in congestion of utiity areas, eaving few choices for siting
of additiona pumps.
Within the framework of these and other existing conditions,
every pump shou d be ocated in such a way that four key
factors are ba anced against each other to maximum advan-
tage.
1. ACCESS: First of a , the ocation shou d be accessib e. If it’s
easy to reach the pump, maintenance personne wi have an
easier time carrying out routine inspections and adjustments.
Shou d major repairs become necessary, ease of access can
p ay a key ro e in speeding the repair process and reducing tota
downtime.
2. AIR SUPPLY: Every pump ocation shou d have an air ine
arge enough to supp y the vo ume of air necessary to achieve
the desired pumping rate (see pump performance chart). Use
air pressure up to a maximum of 8.6 Bar (125 psi) depending
upon pumping requirements.The use of an air fi ter before the
pump wi ensure that the majority of any pipe ine contaminants
wi be eiminated.For best resuts, the pumps shoud use an air
fi ter, regu ator, and ubricator system.
3. ELEVATION: Se ecting a site that is we within the pump’s
suction ift capabi ity wi assure that oss-of-prime troubes wi
be eiminated. In addition, pump efficiency can be adversey
affected if proper attention is not given to e evation (see pump
performance chart).
4. PIPING: Fina determination of the pump site shou d not be
made unti the piping prob ems of each possib e ocation have
been eva uated. The impact of current and future insta ations
shou d be considered ahead of time to make sure that inadver-
tent restrictions are not created for any remaining sites.
The best choice possib e wi be a site invo ving the shortest and
the straightest hook-up of suction and discharge piping. Unnec-
essary e bows, bends, and fittings shoud be avoided.Pipe sizes
shou d be se ected so as to keep friction osses within practica
imits. A piping shoud be supported independent y of the
pump. In addition, it shou d ine up without p acing stress on the
pump fittings.
Expansion joints can be insta ed to aid in absorbing the forces
created by the natura reciprocating action of the pump. If the
pump is to be boted down to a so id foundation, a mounting pad
p aced between the pump and foundation wi assist in minimiz-
ing pump vibration.Fexibe connections between the pump and
rigid piping wi a so assist in minimizing pump vibration.If quick-
c osing vaves are insta ed at any point in the discharge system,
or if pu sation within a system becomes a probem, a surge
suppressor shou d be insta ed to protect the pump, piping and
gauges from surges and water hammer.
When pumps are insta ed in app ications invo ving f ooded
suction or suction head pressures, a gate va ve shou d be
insta ed in the suction ine to permit c osing of the ine for pump
service.
The T4 can be used in submersibe app ications on y when both
wetted and non-wetted portions are compatibe with the mater-
ia being pumped. If the pump is to be used in a submersib e
app ication, a hose shou d be attached to the pump’s air
exhaust and the exhaust air piped above the iquid eve .
If the pump is to be used in a se f-priming app ication, be sure
that a connections are airtight and that the suction ift is within
the pump’s abiity.Note:Materias of construction and eastomer
materia have an effect on suction ift parameters. P ease refer
to pump performance data.
Pumps in service with a positive suction head are most efficient
when in et pressure is imited to .5–.7 Bar (7–10 psig). Prema-
ture diaphragm fai ure may occur if positive suction is .8 Bar (11
psig) and higher.
THE MODEL T4 WILL PASS 4.8 mm (3⁄16") SOLIDS. WHEN-
EVER THE POSSIBILITY EXISTS THAT LARGER SOLID
OBJECTS MAY BE SUCKED INTO THE PUMP, A STRAINER
SHOULD BE USED ON THE SUCTION LINE.
CAUTION: DO NOT EXCEED 8.6 BAR (125 PSIG) AIR
SUPPLY PRESSURE.
PUMPS SHOULD BE THOROUGHLY FLUSHED WITH
WATER BEFORE INSTALLING INTO PROCESS LINES. FDA
AND USDA PUMPS SHOULD BE CLEANED AND/OR SANI-
TIZED BEFORE USE ON EDIBLE PRODUCTS.
BLOW OUT AIR LINE FOR 10 TO 20 SECONDS BEFORE
ATTACHING TO PUMP TO MAKE SURE ALL PIPE LINE
DEBRIS IS CLEAR. ALWAYS USE AN IN-LINE AIR
FILTER.

11 WILDEN PUMP & ENGINEERING CO.
SUGGESTED INSTALLATION
MUFFLER
FLEXIBLE
CONNECTION
PIPE CONNECTION
(STYLE OPTIONAL)
EQUALIZER
SURGE DAMPENER
(OPTIONAL)
DISCHAR E
S UT OFF
VALVE
GAUGE
(OPTIONAL)
COMBINATION
FILTER,
REGULATOR &
LUBRICATOR
NEEDLE
VALVE
FLEXIBLE
CONNECTIONS
SUCTION
AIR
S UT
OFF
VALVE
SECTION 7B – AIR OPERATION
SUGGESTED OPERATION AND
MAINTENANCE INSTRUCTIONS
OPERATION: Pump discharge rate can be contro ed by imit-
ing the vo ume and/or pressure of the air supp y to the pump
(preferred method). An air regu ator is used to regu ate air
pressure. A need e va ve is used to regu ate vo ume. Pump
discharge rate can a so be contro ed by thrott ing the pump
discharge by partia y c osing a va ve in the discharge ine of
the pump. This action increases friction oss which reduces
f ow rate. This is usefu when the need exists to contro the
pump from a remote ocation.When the pump discharge pres-
sure equa s or exceeds the air supp y pressure, the pump wi
stop; no bypass or pressure re ief va ve is needed, and pump
damage wi not occur. The pump has reached a “deadhead”
situation and can be restarted by reducing the f uid discharge
pressure or increasing the air in et pressure. The Wi den T4
pump runs so e y on compressed air and does not generate
heat, therefore your process f uid temperature wi not be
affected.
RECORDS: When service is required, a record shou d be
made of a necessary repairs and rep acements. Over a
period of time, such records can become a va uabe too for
predicting and preventing future maintenance prob ems and
unschedu ed downtime. In addition, accurate records make it
possib e to identify pumps that are poor y suited to their app i-
cations.
MAINTENANCE AND INSPECTIONS: Since each app ication
is unique, maintenance schedu es may be different for every
pump. Frequency of use, ine pressure, viscosity and abra-
siveness of process f uid a affect the parts ife of a Wi den
pump. Periodic inspections have been found to offer the best
means for preventing unschedu ed pump downtime.Personne
fami iar with the pump’s construction and service shou d be
informed of any abnorma ities that are detected during opera-
tion.
AIR OPERATED PUMPS: To stop the pump from operating in an emergency
situation, simp y c ose the “shut-off” va ve (user supp ied) insta ed in the air
supp y ine. A proper y functioning vave wi stop the air supp y to the pump,
therefore stopping output. This “shut-off” vave shou d be ocated far enough
away from the pumping equipment such that it can be reached safe y in an
emergency situation.
ACCU-FLOW PUMPS: Accu-F o pumps function with so enoid va ves and
require an e ectrica contro circuit to supp y pu ses. Under norma operating
conditions, the contro circuit is sufficient for starting and stopping the pump.
However, the “shut-off” va ve (user supp ied) insta ed in the air supp y ine can
be used to stop the pump if necessary. Therefore, it shou d be ocated far
enough away from the pumping equipment such that it can be reached safe y
in an emergency situation.
NOTE: In the event of a power fai ure, the shutoff
vave shoud be c osed, if the restarting of the
pump is not desireab e once power is regained.

12
WILDEN PUMP & ENGINEERING CO.
SECTION 7C
OPERATING PRINCIPLES BEHIND
ACCU-FLO™ PUMPS
In Accu-F o™ pump mode s, the standard air vave is rep aced
with a two position, four-way so enoid va ve that has a singe
operator and spring return.The vave is interna y air pi oted for
onger coi and operator ife.
When the so enoid is unpowered, one air chamber is pressur-
ized with air, whi e the opposite chamber is exhausted. When
e ectric power is app ied, the so enoid shifts, and the pressur-
ized air chamber is exhausted whie the opposite chamber is
pressurized. By aternate y app ying and removing power, the
so enoid-operated pump runs ike a standard Wi den pump.
The speed of the pump is contro ed e ectrica y. Since each
stroke is contro ed by an e ectrica signa , the pump is idea for
batching and other eectrica y contro ed dispensing appications.
A though the speed of the pump is contro ed e ectrica y, the air
pressure is important.Air pressure disp aces the f uid, and if the
pressure is insufficient to comp ete the physica stroke before an
e ectronic impu se signa s the pump to shift, the stroke wi not
be comp eted, and the disp acement per stroke wi be reduced.
This does not harm the unit in any way, but it may cause inac-
curacy when attempting to batch specific quantities with high
precision if this effect is not taken into account.
There are three coi vo tage options avaiabe.One coi a ows for
24V DC operation. The second coi option a ows for operation
with either 12V DC or 24V AC at 60 Hz and the third coi option
a ows for 110V AC operation.
SECTION 7D
INSTALLATION – A4 PLASTIC
ACCU-FLO™ PUMPS
Before insta ing your A4 Accu-F o™ pump, review Section 7A
for genera insta ation suggestions inc uding Location, Access,
Air Suppy, E evation, and Piping.
The Accu-F o™ Mode A4 has a 3.81 cm (11⁄2") inet and 3.81 cm
(11⁄2") out et and is designed for f ows to 92.7 pm (24.5 gpm).
This maximum f ow rate was cacu ated at 300 strokes per
minute with 100 psig air in et against 0 psig discharge head.The
A4 P astic pump is manufactured with wetted parts of
po ypropy ene or PVDF. The center section of the A4 P astic
pump is of a uminum or po ypropy ene construction. A variety of
diaphragms, va ve ba s, and O-rings are avai abe to satisfy
temperature, chemica compatibi ity, abrasion and f ex
concerns.
A wiring used to operate the pump shou d be p aced and
connected according to the proper e ectrica codes. It is impor-
tant that the wiring is of adequate gauge to carry the current
required to operate the pump. In addition, it is necessary that
the e ectrica power supp y is arge enough to supp y the
current required to operate the pump. Wiring shou d be above
ground eve if possibe (in case of f uid spi or eakage), and a
wiring and connections which coud become wet or damp
shou d be made watertight.
If the pump is to be used in a se f-priming app ication, be sure
that a connections are airtight and that the suction ift is within
the pump’s abiity.Note:Materias of construction and eastomer
materia have an effect on suction ift parameters. P ease refer
to pump performance data.
Pumps in service with a positive suction head are most efficient
when in et pressure is imited to .5–.7 Bar (7–10 psig). Prema-
ture diaphragm faiure may occur if positive suction head is .8
Bar (11 psig) and higher.
The so enoid va ve is rated for continuous duty; however, stop-
ping on an even number stroke count insures that the e ectrica
power is off when pump is stopped. This practice is safer and
a so e iminates unwanted strokes when the system is shut down
and e ectrica power is off.
THE MODEL A4 WILL PASS 4.8 mm (3⁄16") SOLIDS. WHEN-
EVER THE POSSIBILITY EXISTS THAT LARGER SOLID
OBJECTS MAY BE SUCKED INTO THE PUMP, A STRAINER
SHOULD BE USED ON THE SUCTION LINE.
WARNING: Before installation, consult chart in Section
10B (page 30) to ensure proper electrical connection.
WARNING: The solenoid valve should not be used in an
area where e plosion proof equipment is required unless
NEMA 7 valve is specified.
There are three coi options avai abe in both NEMA 4 and
NEMA 7 ratings. One coi a ows for 110V AC operation, one
a ows for 24V DC operation, and the third a ows for either 24V
AC or 12V DC operation. See Section 10B for options and part
numbers.

13 WILDEN PUMP & ENGINEERING CO.
POWER
SUPPLY
REPEAT
CYCLE
TIMER
RELAY
SWITC ED (CONTROL) CONNECTION
GROUND (SAFETY) CONNECTION
COMMON CONNECTION
FLICKER MODE RELAY OR BATC CONTROLLER
*
*
*
*
*
FLUID INLET
DISC ARGE
S UTOFF VALVE
COMBINATION FILTER AND REGULATOR
FLEXIBLE CONNECTION
AIR SUPPLY
SUCTION LINE
DISC ARGE LINE
AIR INLET
FLEXIBLE CONNECTION
INTAKE
S UTOFF VALVE
FLEXIBLE
CONNECTION
ACCU-FLO™ ELECTRICAL
CONNECTIONS
ACCU-FLO™ PLUMBING
CONNECTIONS
SECTION 7E – ACCU-FLO™
SUGGESTED OPERATION AND
MAINTENANCE INSTRUCTIONS
OPERATION: The speed of the pump is contro ed e ectrica y.
Since each stroke is contro ed by an e ectrica signa , the pump
is idea for batching and other e ectrica y contro ed dispensing
app ications.
A though the speed of the pump is contro ed e ectrica y, the air
pressure is important.Air pressure disp aces the f uid, and if the
pressure is insufficient to comp ete the physica stroke before an
e ectronic impu se signa s the pump to shift, the stroke wi not
be comp eted, and the disp acement per stroke wi be reduced.
This does not harm the unit in any way, but it may cause inac-
curacy when attempting to batch specific quantities with high
precision.
The so enoid operated pump is permanent y ubricated during
assemby, and requires no additiona ubrication under norma
operation. If the unit runs under extreme conditions (continuous
operation at high speeds), it may be necessary to reubricate
the center bock with a Buna-N®compatible NLGI Grade 2
grease every 50 mi ion cyc es. Continuous ubrication with a
compatibe oi is not harmfu , and wi provide onger sea ife, but
it may f ush a grease out of the unit.
A red button on the side of the air va ve is a manua override;
when actuated it wi shift the va ve as if an e ectric current had
actuated the so enoid.
RECORDS: When service is required, a record shou d be
made of a necessary repairs and rep acements. Over a
period of time, such records can become a va uabe too for
predicting and preventing future maintenance prob ems and
unschedu ed downtime. In addition, accurate records make it
possib e to identify pumps that are poor y suited to their app i-
cations.
MAINTENANCE AND INSPECTIONS: Since each app ication
is unique, maintenance schedu es may be different for every
pump. Frequency of use, ine pressure, viscosity and abra-
siveness of process f uid a affect the parts ife of a Wi den
pump. Periodic inspections have been found to offer the best
means for preventing unschedu ed pump downtime.Personne
fami iar with the pump’s construction and service shou d be
informed of any abnorma ities that are detected during opera-
tion. Interna maintenance is not recommended for Accu-F o™
so enoid air va ves. When worn or damaged, a new air va ve
body, coi or termina connector must be purchased. P ease
consu t section 9C for part numbers

14
WILDEN PUMP & ENGINEERING CO.
SECTION 7F – AIR-CONTROLLED
TROUBLESHOOTING
Pump will not run or runs slowly.
1. Check air in et screen and air fi ter for debris.
2. Check for sticking air vave, f ush air va ve in so vent.
3. Check for worn out air vave. If piston face in air vave is
shiny instead of du , air va ve is probab y worn beyond working
to erances and must be rep aced.
4. Check center b ock G yd™ rings. If worn excessive y, they
wi not sea and air wi simp y f ow through pump and out air
exhaust. Use on y Wi den G yd™ rings as they are of specia
construction.
5. Check for rotating piston in air va ve.
6. Check type of ubricant being used. A higher viscosity oi
than suggested may cause the piston to stick or run erratica y.
Wi den suggests the use of an oi with arctic characteristics (ISO
15-5 wt.).
Pump runs but little or no product flows.
1. Check for pump cavitation; s ow pump speed down to
match thickness of materia being pumped.
2. Check for sticking ba check va ves. If materia being
pumped is not compatib e with pump e astomers, swe ing may
occur. Rep ace ba check va ves and O-rings with the proper
e astomers.
3. Check to make sure a suction connections are air tight,
especia y c amp bands around intake ba s.
Pump air valve freezes.
Check for excessive moisture in compressed air. Either insta
dryer or hot air generator for compressed air.
Air bubbles in pump discharge.
1. Check for ruptured diaphragm.
2. Check tightness of camp bands, especia y at intake mani-
fo d.
Product comes out air exhaust.
1. Check for diaphragm rupture.
2. Check tightness of piston p ates to shaft.
Pump rattles.
1. See E9 Troubeshooting Guide.
2. Create fa se discharge head or suction ift.
SECTION 7G – ACCU-FLO™
TROUBLESHOOTING
Pump will not run.
1. Check for pressurized air at the inet. (Min.3.1 Bar [45 psig].)
2. Check air in et and fi ter for debris.
3. Connect a test amp to the two wires which run to pump
and ensure that the amp cyc es on and off.
4. Make sure that the air va ve manua override (sma red
knob on front of vave) is switched to the “0” position.
5. Check pi ot pressure vent at the top of the operator/coi
assemby to ensure that it is not cogged.
6. Check for a worn out air va ve. If air continua y b ows out
the exhaust in very arge quantities, the air vave sea s may be
worn beyond their abiity to function.In this case, the vave must
be repaced.
NOTE: Before the va ve is scrapped, it is possibe that it may be
saved by compete y disassembing the va ve, c eaning a
components and re ubricating the va ve.
Pump runs but little or no fluid comes out.
1. Check that the discharge iso ation va ve is not c osed.
2. Check that the e ectronic signa is s ow enough that the
pump is abe to comp ete each physica stroke before it is
signa ed to change direction.The time required to comp ete the
stroke is determined by a variety of factors which inc ude f uid
viscosity and head pressure. The shaft can be viewed if the
muffer is removed to verify that the pump is stroking.
3. Check for pump cavitation; s ow pump speed down to
match the thickness of the materia being pumped.
4. Check for sticking ba check vaves. If the materia being
pumped is not compatib e with the pump e astomers, swe ing
may occur.Rep ace ba check va ves and O-ring with the proper
e astomers.
5. Check to make sure that a suction connections are air
tight, and that the c amp bands are proper y tightened.
Pump air passages blocked with ice.
Check for excessive moisture in compressed air ine. As the air
expands out the exhaust during the operation of the pump,
water vapor entrapped in the compressed air can freeze and
bock the air passageways in the pump. If this occurs, it may
be necessary to insta a coa escing fi ter, an air dryer, or a hot
air generator for the compressed air.
Air bubbles in pump discharge.
1. Check for ruptured diaphragm.
2. Check tightness of c amp bands, and the integrity of the
O-rings, especia y at intake manifo d.
Product comes out air exhaust.
1. Check for diaphragm rupture.
2. Check tightness of piston p ates to shaft.
Pump rattles.
1. See E9 Troubeshooting Guide.
2. Create fa se discharge head or suction ift.
Solenoid buzzes or solenoid burnout.
1. Incorrect vo tage, fauty or dirty so enoid.
Solenoid valve fails to shift electrically but shifts with
manual override.
1. Incorrect vo tage, defective coi or wiring.
Solenoid valve fails to shift electrically or with manual over-
ride.
1. Inadequate air supp y, contamination, inadequate or
improper ubrication, mechanica binding in the va ve.
Valve shifts but fails to return.
1. Broken spring, mechanica binding.
xcessive leaking from air valve vent.
1. Worn seas in air va ve.

15 WILDEN PUMP & ENGINEERING CO.
SECTION 8A
MODEL T4 PLASTIC
DIRECTIONS FOR DISASSEMBLY/REASSEMBLY
Figure 1
Step 2. Figure 2
Uti izing a 1⁄2" wrench, remove the two sma c amp bands that
fasten the discharge manifo d to the iquid chambers. (Figure 2
Step 3. Figure 3
Lift away the discharge manifo d to expose the va ve ba s and
seats. (Figure 3
CAUTION: Before any maintenance or repair is attempted, the
compressed air ine to the pump shoud be disconnected and a
air pressure a owed to b eed from the pump. Disconnect a
intake, discharge, and air ines. Drain the pump by turning it
upside down and a owing any fuid to f ow into a suitabe
container. Be aware of any hazardous effects of contact with
your process fuid.
The Wi den mode T4 has a 3.81 cm (11⁄2") inet and out et and is
designed for f ows up to 306.6 pm (81 gpm).The mode T4 pas-
tic is avai abe in po ypropy ene, PVDF, or Tef on®PFA wetted
parts. The air va ve is manufactured of brass, Tef on®-coated
brass, nicke -p ated brass or Stain ess Stee . A O-rings used in
the pump are of a specia materia and shore hardness which
shou d ony be repaced with factory-suppied parts.
TOOLS REQUIRED:
1⁄2" Wrench
3⁄16" A en Wrench
Adjustabe Wrench
Vise equipped with soft jaws (such as p ywood, p astic
or other suitabe materia)
NOTE: The mode used for these instructions incorporates
rubber diaphragms, ba s, and seats. Mode s with Tef on®
diaphragms, ba s and seats are the same except where noted.
The procedures for A4 Accu-F o™ pumps are the same except
for the air distribution system.
DISASSEMBLY:
Step 1.
Before starting disassemby, mark a ine from each iquid cham-
ber to its corresponding air chamber. This ine wi assist in
proper aignment during reassemby. (Figure 1

16
WILDEN PUMP & ENGINEERING CO.
Step 4. Figure 4
Remove the discharge va ve ba s, O-rings and seats (Figure
4 from the iquid chambers and inspect for nicks, gouges,
chemica attack or abrasive wear. Rep ace worn parts with
genuine Wi den parts for re iab e performance.
Step 5. Figure 5
Remove the two sma camp bands which fasten the intake
manifo d to the iquid chambers. (Figure 5
Step 6. Figure 6
Lift iquid chambers and center section
from intake manifo d to expose intake
vave ba s and seats. (Figure 6
Step 7. Figure 7
Remove the discharge va ve ba s, O-rings
and seats (Figure 7 from the iquid cham-
bers and inspect for nicks, gouges, chem-
ica attack or abrasive wear. Rep ace worn
parts with genuine Wi den parts for re iabe
performance.
Step 8. Figure 8
Norma y inet and discharge manifo ds
shou d not be disassembed during reguar
pump maintenance. Shou d this be neces-
sary, comp ete y remove c amp bands and
inspect O-rings for nicks, cuts and chemi-
ca attack. (Figure 8

17 WILDEN PUMP & ENGINEERING CO.
Step 12. Figure 12
NOTE: Due to varying torque vaues, one of the fo owing two situations may occur: 1)
The outer piston, diaphragm and inner piston remain attached to the shaft and the
entire assemb y can be removed from the center section (Figure 12 . 2) The outer
piston, diaphragm and inner piston separate from the shaft which remains connected to
the opposite side diaphragm assemby (Figure 13 . Repeat disassemby instructions for
the opposite iquid chamber.Inspect diaphragm assemby and shaft for signs of wear or
chemica attack. Rep ace a worn parts with genuine Wi den parts for re iab e perfor-
mance.
Figure 13 Step 13. Figure 14
To remove diaphragm assemb y from
shaft, secure shaft with soft jaws (a vise
fitted with pywood or other suitabe mate-
ria ) to ensure shaft is not nicked,
scratched, or gouged. Using an adjustab e
wrench or by hand, remove diaphragm
assemby from shaft. Inspect a parts for
wear and rep ace with genuine Wi den
parts if necessary. (Figure 14
Step 9. Figure 9
Remove one set of arge c amp bands,
which secure one iquid chamber to the
center section. (Figure 9
Step 10. Figure 10
Lift iquid chamber away from center
section to expose diaphragm and outer
piston. (Figure 10
Step 11. Figure 11
Using an adjustab e wrench, or by rotating
the diaphragm by hand, remove the
diaphragm assemb y. (Figure 11

18
WILDEN PUMP & ENGINEERING CO.
The air vave assemby consists of both the air va ve body and
piston and the center b ock. The unique design of the air vave
re ies on y on differentia pressure to effect the diaphragm shift.
It is re iab e and simp e to maintain. The bushing in the center
bock, a ong with the diaphragm shaft, provides the “trigger” to
te the air vave to shift.The fo owing procedure wi ensure that
the air va ve on your Wi den pump wi provide ong
troube-free service.
If the piston does not move free y in the air va ve, the entire air
vave shoud be immersed in a ceaning so ution.[NOTE: Do not
force the piston by inserting a meta object.] This soaking shou d
remove any accumu ation of s udge and grit which is preventing
the air va ve piston from moving free y. A so, remove and c ean
the air vave screen (P/N 04-2500-03). If the air vave piston
does not move free y after the above c eaning, the air va ve
shou d be disassembed as fo ows: Remove the snap ring from
the top end of the air vave cy inder and app y an air jet to the
3/16-inch ho e on the opposite end of the air va ve face (see
Figure C . CAUTION: The air va ve end cap may come out with
considerabe force.Inspect the piston and cyinder bore for nicks
and scoring.
AIR VALVE DISASSEMBLY:
The air vave (P/N 04-2000-07) can be disconnected from the
pump by removing the four socket head cap screws which
attach it to the center bock.The piston shou d move freey and
the ports in the piston shoud ine up with the ports on the face
of the air vave body (see Figure D . The piston shou d a so
appear to be du , dark gray in coor. If the piston appears to be
a shiny a uminum co or, the air va ve is probab y worn beyond
working toerances and shoud be repaced.
Figure A
Figure B
Figure C
Figure D
CENTER
BLOCK
AIR FILTER
SCREEN
AIR VALVE
PISTON CENTER BLOCK
BUSHING
AIR INLET
END CAP
AIR VALVE ASSEMBLY
AIR VALVE
BODY
SECTION 8B
AIR VALVE / CENTER BLOCK
DISASSEMBLY
STRIPPING P/U 45343
STRIPPING P/U 45343
STRIPPING P/U 45343
STRIPPING P/U 45343