Dover Wilden Original Series Instruction Manual

EOM
Simplify your process
Engineering
Operation &
Maintenance
Original™Series METAL Pumps
T4/A4
WIL-10260-E-02
REPLACES EOM T4 & A4M 4/05

TABLE OF CONTENTS
PAGE #
SECTION 1 — CAUTIONS ............................................................................................ 1
SECTION 2 — PUMP DESIGNATION SYSTEM ......................................... 2
SECTION 3 — HOW IT WORKS (PUMP & AIR SYSTEMS) ............ 3
SECTION 4 — DIMENSIONAL DRAWINGS
A. T4 METAL Air-Operated ..................................................................................................... 4
B. A4 METAL Accu-Flo™ ....................................................................................................... 4
C. T4 METAL SANIFLOFDA Air-Operated................................................................................. 5
D. T4 METAL Stallion.............................................................................................................. 5
SECTION 5 — PERFORMANCE CURVES
A. T4 METAL Rubber-Fitted ................................................................................................... 6
B. T4 METAL Ultra-Flex™-Fitted............................................................................................ 6
C. T4 METAL TPE-Fitted ........................................................................................................ 7
D. T4 METAL PTFE-Fitted ...................................................................................................... 7
E. T4 METAL Stallion Ultra-Flex™-Fitted............................................................................... 8
F. A4 METAL Accu-Flo™ Rubber/TPE-Fitted........................................................................ 9
G. A4 METAL Accu-Flo™ Rubber/TPE 70/30 Operating Condition ...................................... 9
H. A4 METAL Accu-Flo™ Ultra-Flex™/PTFE-Fitted .............................................................. 10
I. A4 METAL Accu-Flo™ Ultra-Flex™/PTFE-Fitted 70/30 Operating Condition .................. 10
SECTION 6 — SUCTION LIFT CURVES & DATA
A. T4 METAL Air-Controlled ................................................................................................... 11
B. A4 METAL Accu-Flo™ ....................................................................................................... 11
SECTION 7 — INSTALLATION & OPERATION
A. Installation — Turbo-Flo™ Suggested Installation Drawing.............................................. 12
B. Operating and Maintenance .............................................................................................. 13
C. Principles Behind Accu-Flo™ Pumps................................................................................ 14
D. Installation — Accu-Flo™ .................................................................................................. 14
E. Suggested Operation and Maintenance............................................................................ 15
F. Troubleshooting — Turbo-Flo™......................................................................................... 16
G. Troubleshooting — Accu-Flo™.......................................................................................... 16
SECTION 8 — DIRECTIONS FOR DISASSEMBLY/REASSEMBLY
A. T4 METAL Wetted Path — Tools Required, Torque Specs, Cautions ............................... 17
B. Turbo-Flo™ Air Valve/Center Block – Disassembly, Cleaning, Inspection........................ 20
C. Reassembly Hints & Tips................................................................................................... 22
D. PTFE Gasket Kit Installation .............................................................................................. 23
SECTION 9 — EXPLODED VIEW/PARTS LISTING
A. T4 METAL Rubber/TPE-Fitted ........................................................................................... 24
B. T4 METAL PTFE-Fitted ...................................................................................................... 26
C. A4 METAL Accu-Flo™ ....................................................................................................... 28
SECTION 10 — REFERENCE
A. Air-Operated Elastomer Options........................................................................................ 30
B. Stallion Elastomer Options ................................................................................................ 30
C. Accu-Flo™ Electrical Reference........................................................................................ 31
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U.S. Clean Air Act
Amendments of 1990

1WILDEN PUMP & ENGINEERING, LLCWIL-10260-E-02
SECTION 1
MODEL T4 METAL
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: 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: When installing PTFE 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 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 E4).
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: All non lube-free air-operated pumps must be
lubricated. Wilden suggests an arctic 5 weight oil (ISO
grade 15). Do not over-lubricate pump. Over-lubrica-
tion will reduce pump performance.
NOTE: On cast iron pumps equipped with PTFE
diaphragms, balls and sealing rings, PTFE gasket kits
should be utilized.
NOTE: UL-listed pumps must not exceed 3.4 bar (50
psig) air supply pressure.

2
WILDEN PUMP & ENGINEERING, LLC WIL-10260-E-02
SECTION 2
WILDEN PUMP DESIGNATION SYSTEM
NOTE: MOST ELASTOMERIC MATERIALS USE COLORED DOTS FOR IDENTIFICATION.
Viton®is a registered trademarks of DuPont Dow Elastomers.
T4 OR A4 METAL MATERIAL CODES
SPECIALTY CODES
AIR SYSTEM BASE TYPE
A = ACCU-FLO™
T = TURBO-FLO™
WETTED PARTS
& OUTER PISTON
AA = ALUMINUM / ALUMINUM
SS = STAINLESS STEEL / STAINLESS STEEL
WW = CAST IRON / CAST IRON
WM = CAST IRON / MILD STEEL
AIR CHAMBER/
CENTER SECTION
A = ALUMINUM
C = PTFE-COATED ALUMINUM
M = MILD STEEL
N = NICKEL-PLATED ALUMINUM
P = POLYPROPYLENE
CENTER BLOCK / CENTER SECTION
A = ALUMINUM
C = PTFE COATED ALUMINUM
N = NICKEL PLATED ALUMINUM
P = POLYPROPYLENE
AIR VALVE
A = ALUMINUM
B = BRASS
C = PTFE COATED
D = BRASS W/OIL BOTTLE
N = NICKEL PLATED BRASS
S = STAINLESS STEEL
DIAPHRAGMS
BNS = BUNA-N (Red Dot)
BNU = BUNA-N, ULTRA-FLEX™ (Red Dot)
EPS = EPDM (Blue Dot)
EPU = EPDM, ULTRA-FLEX™ (Blue Dot)
FSS = SANIFLEX™
[Hytrel®(Cream)]
NES = NEOPRENE (Green Dot)
NEU = NEOPRENE, ULTRA-FLEX™ (Green Dot)
PUS = POLYURETHANE (Clear)
TEU = PTFE W/EPDM
BACK-UP (White)
TNU = PTFE W/NEOPRENE
BACK-UP (White)
TSU = PTFE W/SANIFLEX™ BACK-UP (White)
VTS = VITON®(White Dot)
VTU = VITON®, ULTRA-FLEX™ (White Dot)
WFS = WIL-FLEX™ [Santoprene®
(Orange Dot)]
VALVE BALL
BN = BUNA-N (Red Dot)
EP = EPDM (Blue Dot)
FS = SANIFLEX™
[Hytrel®(Cream)]
NE = NEOPRENE (Green Dot)
PU = POLYURETHANE (Brown)
TF = PTFE (White)
VT = VITON®(White Dot)
WF = WIL-FLEX™ [Santoprene
®
(Orange Dot)]
VALVE SEAT
A = ALUMINUM*
BN = BUNA-N (Red Dot)
EP = EPDM (Blue Dot)
FS = SANIFLEX™
[Hytrel®(Cream)]
H = ALLOY C*
M = MILD STEEL*
NE = NEOPRENE (Green Dot)
PU = POLYURETHANE (Brown)
S = STAINLESS STEEL*
VT = VITON®(White Dot)
WF = WIL-FLEX™ [Santoprene
®
(Orange Dot)]
*No valve seat o-ring required.
VALVE SEAT O-RING
FS = FLUORO-SEAL™
TF = PTFE (White)
0003 Spark free
0010 Spark free, SS outer piston
0014 BSPT
0015 Spark free, BSPT
0023 Wing nuts
0030 Screen based
0033 Screen based, spark free
0036 Screen based, BSPT
0037 Screen based, spark free, BSPT
0044 Stallion®, balls & seats ONLY
0045 Stallion®, shaft & bumpers ONLY
0046 Stallion®, internals, BSPT
0048 Stallion®, internals
0050 Stallion
0051 Stallion®, BSPT
0067 Saniflo™ FDA, Wil-Gard II™ 220V
0070 Saniflo™ FDA
0076 Saniflo™ FDA, Stallion®internals
0079 Tri-clamp fittings, wing nuts
0080 Tri-clamp fittings ONLY
0090 UL listed
0091 UL listed, Wil-Gard II™ 110V
0092 UL listed, screen based
0100 Wil-Gard II™ 110V
0102 Wil-Gard II™ sensor wires ONLY
0103 Wil-Gard II™ 220V
0104 Wil-Gard II™ 110V, spark free
0105 Spark free, Wil-Gard II™ 220V
0108 BSPT, Wil-Gard II™ 220V
0109 Spark free, BSPT, Wil-Gard II™ 220V
0113 Stallion®, internals, spark free, BSPT
0120 Saniflo™ FDA, Wil-Gard II™ 110V
0124 Saniflo™ FDA, Accu-Flo™, 24 V DC x-proof coil, Intl.,
PTB approved
0127 Saniflo™ FDA, Accu-Flo™, 110V AC coil
0128 Saniflo™ FDA, Accu-Flo™, 24 V AC / 12V DC coil
0129 Saniflo™ FDA, Accu-Flo™, 24V AC / 12V DC x-proof coil
0130 Saniflo™ FDA, Accu-Flo™, 110V AC x-proof coil
0143 Accu-Flo™, 110V AC x-proof coil, BSPT
0144 Accu-Flo™, 110V AC coil, BSPT
0145 Accu-Flo™, 110V AC x-proof coil, Wil-Gard II™ 110V
0147 Accu-Flo™, 24V DC coil, spark free, BSPT
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 AC coil
0156 Accu-Flo™, 110V AC x-proof coil
0157 Accu-Flo™, 24V DC x-proof coil, Intl. PTB approved
0158 Accu-Flo™, 24V DC x-proof coil, Intl., PTB approved, BSPT
0159 Accu-Flo™, 24V DC coil, Intl., PTB approved, DIN flange
0160 Accu-Flo™, 24V DC coil, BSPT
0161 Accu-Flo™, 24V DC x-proof coil, BSPT
0162 Accu-Flo™, 24V AC / 12V DC coil, BSPT
0164 Accu-Flo™, 110V AC coil, Wil-Gard II™ sensor wires ONLY
0166 Accu-Flo™, 24V DC coil, Wil-Gard II™ 110V
0167 Accu-Flo™, 24V AC / 12V DC coil, Wil-Gard II™ 110V
0168 Accu-Flo™, 110V AC coil, Wil-Gard II™ 110V
0169 Accu-Flo™, 110V AC 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
0183 Accu-Flo™, 24V AC / 12V DC x-proof coil,
Wil-Gard II™ 110V
0184 Accu-Flo™, 24V DC coil, PFA coated hardware
0185 Accu-Flo™, 24V DC x-proof coil, PFA coated hardware
0194 Accu-Flo™, 24V DC coil, spark free
0195 Accu-Flo™, 24V DC x-proof coil, spark free
0196 Accu-Flo™, 24V AC / 12V DC coil, spark free
0197 Accu-Flo™, 24V AC / 12V DC x-proof coil, spark free
0198 Accu-Flo™, 110V AC coil, spark free
0199 Accu-Flo™, 110V AC x-proof coil, spark free
0360 Accu-Flo™, 24V DC coil, DIN flange
0363 Accu-Flo™, 110V AC coil, Stallion®internals (balls & seats)
0206 PFA coated hardware, Wil-Gard II™ sensor wires ONLY
0231 Stallion®, externals (screen)
0232 SS outer piston, SS clamp bands and hardware
0233 Stallion®, externals (screen), BSPT
0315 PFA coated hardware, BSPT
0330 Wing nuts, BSPT
0502 PFA coated hardware
0504 DIN flange
0506 DIN flange, PFA coated hardware
0513 SS outer pistons
0603 PFA coated hardware, Wil-Gard II™ 110V
0604 DIN flange, Wil-Gard II™ 220V
0606 DIN flange, PFA coated hardware, Wil-Gard II™ 220V
0608 PFA coated hardware, Wil-Gard II™ 220V
T or A4X/XXXXX/ XXX / XX /XXX / XXXX
O-RINGS
MODEL VALVE SEAT
VALVE BALLS
DIAPHRAGMS
AIR VALVE
CENTER BLOCK OR CENTER SECTION
AIR CHAMBERS OR CENTER SECTION
WETTED PARTS & OUTER PISTON
AIR SYSTEM BASE TYPE
SPECIALTY
CODE
(if applicable)

3WILDEN PUMP & ENGINEERING, LLCWIL-10260-E-02
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.
FIGURE 1 The air valve directs pres-
surized air to the back side of diaphragm
A. The compressed air is applied directly
to the liquid column separated by elas-
tomeric diaphragms. The diaphragm
acts as a separation membrane between
the compressed air and liquid, balanc-
ing the load and removing mechani-
cal stress from the diaphragm. The
compressed air moves the diaphragm
away from the center block of the pump.
The opposite diaphragm is pulled in by
the shaft connected to the pressur-
ized 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 block of the pump creates a
vacuum within chamber B. Atmospheric
pressure forces fluid into the inlet mani-
fold forcing the inlet valve ball off its
seat. Liquid is free to move past the inlet
valve ball and fill the liquid chamber (see
shaded area).
FIGURE 2 When the pressurized
diaphragm, diaphragm A, reaches the
limit of its discharge stroke, the air valve
redirects pressurized air to the back
side of diaphragm B. The pressurized
air forces diaphragm B away from the
center block while pulling diaphragm A
to the center block. 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 its seat,
while the opposite discharge valve ball is
forced onto its seat, forcing fluid to flow
through the pump discharge. The move-
ment of diaphragm A toward the center
block of the pump creates a vacuum
within liquid chamber A. Atmospheric
pressure forces fluid into the inlet mani-
fold of the pump. The inlet valve ball
is forced off its seat allowing the fluid
being pumped to fill the liquid chamber.
FIGURE 3 At completion of the stroke,
the air valve again redirects air 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 exhaust and one discharge stroke.
This constitutes one complete pump-
ing cycle. The pump may take several
cycles to completely prime depending
on the conditions of the application.
RIGHT STROKE MID STROKE LEFT STROKE

4
WILDEN PUMP & ENGINEERING, LLC WIL-10260-E-02
SECTION 4A
DIMENSIONAL DRAWING
T4 METAL
SECTION 4B
DIMENSIONAL DRAWING
A4 METAL ACCU-FLO™
38 mm (1-1/2") BSP/
FNPT LIQUID INLET
32 mm (1-1/4") BSP/
FNPT LIQUID DISCHARGE
13 mm
(1/2") BSP/
FNPT AIR INLET
13 mm (1/2") BSP/
FNPT AIR INLET
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
S
T
U
38 mm (1-1/2") BSP/
FNPT LIQUID INLET
32 mm (1-1/4") BSP/
FNPT LIQUID DISCHARGE
19 mm (3/4")
BSP/ FNPT AIR
EXHAUST
A
B
C
D
E
F
G
HJ
K
L
M
N
P
R
S
T
DIMENSIONS
ITEM METRIC (mm) STANDARD (inch)
A 391 15.4
B 63 2.5
C 219 8.6
D 442 17.4
E 285 11.2
F 262 10.3
G 224 8.8
H 152 6.0
J 178 7.0
K 67 2.6
L 11 0.4
BSP threads available.
DIMENSIONS
ITEM METRIC (mm) STANDARD (inch)
A 391 15.4
B 63 2.5
C 198 7.8
D 442 17.4
E 95 3.8
F 285 11.2
G 262 10.3
H 224 8.8
J 152 6.0
K 178 7.0
L 51 2.0
M 11 0.4
N 336 13.2
P 222 8.8
R 151 5.9
S 195 7.7
T 49 1.9
U 13 0.5
BSP threads available.

5WILDEN PUMP & ENGINEERING, LLCWIL-10260-E-02
SECTION 4C
DIMENSIONAL DRAWING
T4 METAL SANIFLO
FDA
SECTION 4D
DIMENSIONAL DRAWING
T4 METAL STALLION
Accu-Flo™ model available.
38 mm (1-1/2") BSP/
FNPT LIQUID INLET
32 mm (1-1/4") BSP/
FNPT LIQUID DISCHARGE
13 mm (1/2") BSP/
FNPT AIR INLET
A
F
G
H
J
B
C
D
E
51 mm (2")
TRI-CLAMP
51 mm (2")
TRI-CLAMP
13 mm (1/2") BSP/
FNPT AIR INLET
19 mm
(3/4")
BSP/
FNPT AIR
EXHAUST
A
F
G
H
J
K
L
B
C
D
E
DIMENSIONS
ITEM METRIC (mm) STANDARD (inch)
A 391 15.4
B 63 2.5
C 219 8.6
D 442 17.4
E 285 11.2
F 262 10.3
G 224 8.8
H 152 6.0
J 178 7.0
K 67 2.6
L 11 0.4
DIMENSIONS
ITEM METRIC (mm) STANDARD (inch)
A 391 15.4
B 77 3.0
C 232 9.1
D 449 17.7
E 285 11.2
F 48 1.9
G 197 7.8
H 121 4.8
J Ø14 Ø 0.6
BSP threads available.

6
WILDEN PUMP & ENGINEERING, LLC WIL-10260-E-02
SECTION 5A
PERFORMANCE CURVES
T4 METAL RUBBER-FITTED
Height.................................. 442 mm (17.4")
Width................................... 391 mm (15.4")
Depth .................................. 285 mm (11.2")
Est. Ship Weight..........
Aluminum 17 kg (38 lbs)
Stainless Steel 26 kg (57 lbs)
Cast Iron 26 kg (57 lbs)
Air Inlet....................................13 mm (1/2")
Inlet..................................... 38 mm (1-1/2")
Outlet .................................. 32 mm (1-1/4")
Suction Lift ................................5.49 m (18')
8.53 m (28')
Displacement per
Stroke ......................... 1.02 l (0.27 gal.)1
Max. Flow Rate................. 288 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 113.6 lpm (30 gpm)
against a discharge pressure head of 2.7
bar (40 psig) requires 4.1 bar (60 psig) and
25.5 Nm3/h (15 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.
[LPM]
Water Discharge Flow Rates
SECTION 5B
PERFORMANCE CURVES
T4 METAL ULTRA-FLEX™-FITTED
Height.................................. 452 mm (17.4")
Width................................... 391 mm (15.4")
Depth .................................. 285 mm (11.2")
Est. Ship Weight..........
Aluminum 17 kg (38 lbs)
Stainless Steel 26 kg (57 lbs)
Cast Iron 26 kg (57 lbs)
Air Inlet....................................13 mm (1/2")
Inlet..................................... 38 mm (1-1/2")
Outlet .................................. 32 mm (1-1/4")
Suction Lift ......................... 4.88 m Dry (16')
8.23 m Wet (27')
Displacement per
Stroke ........................... 0.68 l (0.18 gal.)1
Max. Flow Rate................ 235 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 bar (60 psig) and 34
Nm3/h (20 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.
[LPM]
Water Discharge Flow Rates

7WILDEN PUMP & ENGINEERING, LLCWIL-10260-E-02
SECTION 5C
PERFORMANCE CURVES
T4 METAL TPE-FITTED
Height.................................. 442 mm (17.4")
Width................................... 391 mm (15.4")
Depth .................................. 285 mm (11.2")
Est. Ship Weight..........
Aluminum 17 kg (38 lbs)
Stainless Steel 26 kg (57 lbs)
Cast Iron 26 kg (57 lbs)
Air Inlet....................................13 mm (1/2")
Inlet..................................... 38 mm (1-1/2")
Outlet .................................. 32 mm (1-1/4")
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................. 307 lpm (81 gpm)
Max. Size Solids ...................4.8 mm (3/16")
1Displacement per stroke was calculated at 70 psig
(4.8 bar) air inlet pressure against a 2 bar (30 psig)
head pressure.
Example: To pump 113.6 lpm (30 gpm)
against a discharge pressure head of 2.7
bar (40 psig) requires 4.1 bar (60 psig) and
25.5 Nm3/h (15 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.
[LPM]
Water Discharge Flow Rates
SECTION 5D
PERFORMANCE CURVES
T4 METAL PTFE-FITTED
Height.................................. 442 mm (17.4")
Width................................... 391 mm (15.4")
Depth .................................. 285 mm (11.2")
Est. Ship Weight..........
Aluminum 17 kg (38 lbs)
Stainless Steel 26 kg (57 lbs)
Cast Iron 26 kg (57 lbs)
Air Inlet....................................13 mm (1/2")
Inlet..................................... 38 mm (1-1/2")
Outlet .................................. 32 mm (1-1/4")
Suction Lift ........................... 2.74 m Dry (9')
8.53 m Wet (28')
Displacement per
Stroke ........................... 0.53 l (0.14 gal.)1
Max. Flow Rate................. 235 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.
[LPM]
Water Discharge Flow Rates

8
WILDEN PUMP & ENGINEERING, LLC WIL-10260-E-02
SECTION 5E
PERFORMANCE CURVES
T4 METAL STALLION ULTRA-FLEX™-FITTED
Height.................................. 449 mm (17.7")
Width................................... 391 mm (15.4")
Depth .................................. 285 mm (11.2")
Est. Ship Weight..........
Aluminum 20 kg (44 lbs)
Air Inlet....................................13 mm (1/2")
Inlet..................................... 38 mm (1-1/2")
Outlet .................................. 32 mm (1-1/4")
Suction Lift ......................... 4.27 m Dry (14')
8.23 m Wet (27')
Displacement per
Stroke ........................... 0.64 l (0.17 gal.)1
Max. Flow Rate................. 216 lpm (57 gpm)
Max. Size Solids ......................13 mm (1/2")
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 98.4 lpm (26 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 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.
[LPM]
Water Discharge Flow Rates

9WILDEN PUMP & ENGINEERING, LLCWIL-10260-E-02
SECTION 5F
PERFORMANCE CURVES
A4 METAL ACCU-FLO™ RUBBER-FITTED
Height.................................. 442 mm (17.4")
Width................................... 391 mm (15.4")
Depth .................................. 285 mm (11.2")
Est. Ship Weight..........
Aluminum 16 kg (36 lbs)
Stainless Steel 25 kg (55 lbs)
Cast Iron 25 kg (55 lbs)
Hastelloy 25 kg (55 lbs)
Air Inlet....................................10 mm (3/8")
Inlet..................................... 38 mm (1-1/2")
Outlet .................................. 32 mm (1-1/4")
Suction Lift ........................... 7.6 m Dry (25')
8.8 m Wet (29')
Displacement per
Stroke ........................... 0.53 l (0.14 gal.)1
Max. Flow Rate................. 174 lpm (46 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 49 lpm (13 gpm) against a
discharge pressure head of 2.7 bar (40 psig)
requires 4.1 bar (60 psig) and 20 Nm3/h(12
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.
[LPM]
Water Discharge Flow Rates
SECTION 5G
70/30 OPERATING CONDITION
A4 METAL ACCU-FLO™ RUBBER-FITTED
[LPM]
Water Discharge Flow Rates
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 conditions
to estimate the change in flow due to
stroke rate.

10
WILDEN PUMP & ENGINEERING, LLC WIL-10260-E-02
SECTION 5I
70/30 OPERATING CONDITION
A4 METAL ACCU-FLO™ ULTRA-FLEX™-FITTED
[LPM]
Water Discharge Flow Rates
SECTION 5H
PERFORMANCE CURVES
A4 METAL ACCU-FLO™ ULTRA-FLEX™-FITTED
Height.................................. 442 mm (17.4")
Width................................... 391 mm (15.4")
Depth .................................. 285 mm (11.2")
Est. Ship Weight..........
Aluminum 16 kg (36 lbs)
Stainless Steel 25 kg (55 lbs)
Cast Iron 25 kg (55 lbs)
Hastelloy 25 kg (55 lbs)
Air Inlet....................................10 mm (3/8")
Inlet..................................... 38 mm (1-1/2")
Outlet .................................. 32 mm (1-1/4")
Suction Lift ........................... 6.7 m Dry (22')
8.8 m Wet (29')
Displacement per
Stroke ........................... 0.98 l (0.26 gal.)1
Max. Flow Rate................. 197 lpm (52 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 72 lpm (19 gpm) against a
discharge pressure head of 2.7 bar (40 psig)
requires 4.1 bar (60 psig), 18.7 Nm3/h (11
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.
[LPM]
Water Discharge Flow Rates
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 conditions
to estimate the change in flow due to
stroke rate.

11 WILDEN PUMP & ENGINEERING, LLCWIL-10260-E-02
SECTION 6A – AIR-CONTROLLED
SUCTION LIFT CURVES & DATA
SECTION 6B – ACCU-FLO™
SUCTION LIFT CURVES & DATA
Suction lift curves are calibrated for pumps operating at
1,000' (305 m) above sea level. This chart is meant to be
a guide only. There are many variables which can affect
your pump’s operating characteristics. The number of intake
and discharge elbows, viscosity of pumping fluid, elevation
(atmospheric pressure) and pipe friction loss all affect the
amount of suction lift your pump will attain.
Suction lift curves are calibrated for pumps operating at
1,000' (305 m) above sea level. This chart is meant to be
a guide only. There are many variables which can affect
your pump’s operating characteristics. The number of intake
and discharge elbows, viscosity of pumping fluid, elevation
(atmospheric pressure) and pipe friction loss all affect the
amount of suction lift your pump will attain.
PTFE Diaphragms
[0.7] [1.4] [2.0] [2.7] [3.4] [4.1] [4.8] [5.5] [6.2] [6.9]
Ultraflex™/PTFE Diaphragms
[0.7] [1.4] [2.0] [2.7] [3.4] [4.1] [4.8] [5.5] [6.2] [6.9]

12
WILDEN PUMP & ENGINEERING, LLC WIL-10260-E-02
SECTION 7A
INSTALLATION – T4 METAL
AIR-OPERATED PUMPS
The Model T4 Metal pump has a 38 mm (1-1/2") inlet and
32 mm (1-1/4") outlet and is designed for flows to 307 lpm
(81 gpm).
The T4 Metal pump is manufactured with wetted
parts of aluminum, cast iron, or stainless steel. The T4 Metal
pump comes with either a center block or center section. The
T4 center block is constructed of aluminum or nickel-plated
aluminum. The T4 center section comes in polypropylene.
The air distribution system consists of a brass air valve body,
aluminum piston, Glyd™ rings and a bronze center section
bushing. A variety of diaphragms, valve balls, valve seats,
and o-rings are available to satisfy temperature, chemical
compatibility, abrasion and flex concerns.
The suction pipe size should be at least 38 mm (1-1/2")
diameter or larger if highly viscous material is being pumped.
The suction hose must be non-collapsible, reinforced type
as the T4 is capable of pulling a high vacuum. Discharge
piping should be at least 32 mm (1-1/4"); larger diameter can
be used to reduce friction losses. It is critical that all fittings
and connections are airtight or a reduction or loss of pump
suction capability will result.
INSTALLATION: Months of careful planning, study, and
selection efforts can result in unsatisfactory pump performance
if installation details are left to chance.
Premature failure and long term dissatisfaction can be avoided
if reasonable care is exercised throughout the installation
process.
LOCATION: Noise, safety, and other logistical factors usually
dictate that “utility” equipment be situated away from
the production floor. Multiple installations with conflicting
requirements can result in congestion of utility areas, leaving
few choices for siting of additional pumps.
Within the framework of these and other existing conditions,
every pump should be located in such a way that four key factors
are balanced against each other to maximum advantage.
1. ACCESS: First of all, the location should be accessible.
If it’s easy to reach the pump, maintenance personnel will
have an easier time carrying out routine inspections and
adjustments. Should major repairs become necessary, ease
of access can play a key role in speeding the repair process
and reducing total downtime.
2. AIR SUPPLY: Every pump location should have an air
line large enough to supply the volume 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
psig) depending upon pumping requirements. The use of an
air filter before the pump will ensure that the majority of any
pipeline contaminants will be eliminated. For best results,
the pumps should use an air filter, regulator, and lubricator
system.
3. SOLENOID OPERATION: the pumps should use a 5µ
micron air filter, needle valve and regulator. The use of an
air filter before the pump will ensure that the majority of any
pipeline contaminants will be eliminated.
4. ELEVATION: Selecting a site that is well within the pump’s
suction lift capability will assure that loss-of-prime troubles will
be eliminated. In addition, pump efficiency can be adversely
affected if proper attention is not given to elevation (see pump
performance chart).
5. PIPING: Final determination of the pump site should not
be made until the piping problems of each possible location
have been evaluated. The impact of current and future
installations should be considered ahead of time to make
sure that inadvertent restrictions are not created for any
remaining sites.
The best choice possible will be a site involving the shortest
and the straightest hook-up of suction and discharge
piping. Unnecessary elbows, bends, and fittings should be
avoided. Pipe sizes should be selected so as to keep friction
losses within practical limits. All piping should be supported
independently of the pump. In addition, it should line up
without placing stress on the pump fittings.
Expansion joints can be installed to aid in absorbing the forces
created by the natural reciprocating action of the pump. If the
pump is to be bolted down to a solid foundation, a mounting
pad placed between the pump and foundation will assist in
minimizing pump vibration. Flexible connections between
the pump and rigid piping will also assist in minimizing
pump vibration. If quick-closing valves are installed at any
point in the discharge system, or if pulsation within a system
becomes a problem, a surge suppressor should be installed
to protect the pump, piping and gauges from surges and
water hammer.
When pumps are installed in applications involving flooded
suction or suction head pressures, a gate valve should be
installed in the suction line to permit closing of the line for
pump service.
The T4 can be used in submersible applications only when both
wetted and non-wetted portions are compatible with the material
being pumped. If the pump is to be used in a submersible
application, a hose should be attached to the pump’s air exhaust
and the exhaust air piped above the liquid level.
If the pump is to be used in a self-priming application, be
sure that all connections are airtight and that the suction lift is
within the pump’s ability. Note: Materials of construction and
elastomer material have an effect on suction lift parameters.
Please refer to pump performance data.
Pumps in service with a positive suction head are most
efficient when inlet pressure is limited to 0.5–0.7 bar (7–10
psig). Premature diaphragm failure may occur if positive
suction is 0.8 bar (11 psig) and higher.
THE MODEL T4 WILL PASS 4.8 mm (3/16") SOLIDS. THE M4
STALLION WILL PASS 13 mm (1/2") SOLIDS. WHENEVER
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. (3.4 BAR [5O PSIG] FOR UL MODELS.)
PUMPS SHOULD BE THOROUGHLY FLUSHED WITH
WATER BEFORE INSTALLING INTO PROCESS LINES.
FDA AND USDA PUMPS SHOULD BE CLEANED AND/OR
SANITIZED 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.

13 WILDEN PUMP & ENGINEERING, LLCWIL-10260-E-02
®
SUGGESTED INSTALLATION
SECTION 7B – AIR OPERATION
SUGGESTED OPERATION AND
MAINTENANCE INSTRUCTIONS
OPERATION: Pump discharge rate can be controlled by
limiting the volume and/or pressure of the air supply to the
pump (preferred method). An air regulator is used to regu-
late air pressure. A needle valve is used to regulate volume.
Pump discharge rate can also be controlled by throttling the
pump discharge by partially closing a valve in the discharge
line of the pump. This action increases friction loss which
reduces flow rate. This is useful when the need exists to
control the pump from a remote location. When the pump
discharge pressure equals or exceeds the air supply pres-
sure, the pump will stop; no bypass or pressure relief valve
is needed, and pump damage will not occur. The pump
has reached a “deadhead” situation and can be restarted
by reducing the fluid discharge pressure or increasing
the air inlet pressure. The Wilden T4 pump runs solely on
compressed air and does not generate heat, therefore your
process fluid temperature will not be affected.
RECORDS: When service is required, a record should be
made of all necessary repairs and replacements. Over a
period of time, such records can become a valuable tool
for predicting and preventing future maintenance problems
and unscheduled downtime. In addition, accurate records
make it possible to identify pumps that are poorly suited to
their applications.
MAINTENANCE AND INSPECTIONS: Since each application
is unique, maintenance schedules may be different for every
pump. Frequency of use, line pressure, viscosity and abrasive-
ness of process fluid all affect the parts life of a Wilden pump.
Periodic inspections have been found to offer the best means
for preventing unscheduled pump downtime. Personnel familiar
with the pump’s construction and service should be informed
of any abnormalities that are detected during operation.
AIR-OPERATED PUMPS: To stop the pump from operating in an emergency situation, simply close the shut-off valve (user supplied) installed in the air
supply line. A properly functioning valve will stop the air supply to the pump, therefore stopping output. This shut-off valve should be located far enough
away from the pumping equipment such that it can be reached safely in an emergency situation.
Accu-Flo™ pumps: Accu-Flo™ pumps function
with solenoid valves and require an electrical control
circuit to supply pulses. Under normal operating
conditions, the control circuit is sufficient for starting
and stopping the pump. However, the shut off valve
(user supplied) installed in the air supply line can
be used to stop the pump if necessary. Therefore, it
shoud be located far enough away from the pumping
equipment such that it can be reached safely in an
emergency situation.
NOTE: In the event of a power failure, the shutoff
valve should be closed, if the restarting of the pump
is not desirable once power is regained.

14
WILDEN PUMP & ENGINEERING, LLC WIL-10260-E-02
SECTION 7D
INSTALLATION – A4 METAL
ACCU-FLO™ PUMPS
Before installing your A4 Accu-Flo™ pump, review Section
7A for general installation suggestions including Location,
Access, Air Supply, Elevation, and Piping.
The Accu-Flo™ Model A4 has a 38 mm (1-1/2") inlet and
32 mm (1-1/4") outlet and is designed for flows to 196 lpm
(52 gpm). This maximum flow rate was calculated at 200
strokes per minute with 8.3 bar (120 psig) air inlet against 0
bar (0 psig) discharge head. The A4 Metal pump is manu-
factured with wetted parts of polypropylene or PVDF. The
center section of the A4 Metal pump is of aluminum or poly-
propylene construction. A variety of diaphragms, valve balls,
and o-rings are available to satisfy temperature, chemical
compatibility, abrasion and flex concerns.
All wiring used to operate the pump should be placed and
connected according to the proper electrical codes. It is
important that the wiring is of adequate gauge to carry
the current required to operate the pump. In addition, it is
necessary that the electrical power supply is large enough
to supply the current required to operate the pump. Wiring
should be above ground level if possible (in case of fluid
spill or leakage), and all wiring and connections which could
become wet or damp should be made watertight.
If the pump is to be used in a self-priming application, be
sure that all connections are airtight and that the suction lift
is within the pump’s ability. Note: Materials of construction
and elastomer material have an effect on suction lift param-
eters. Please refer to pump performance data.
Pumps in service with a positive suction head are most effi-
cient when inlet pressure is limited to 0.5–0.7 bar (7–10 psig).
Premature diaphragm failure may occur if positive suction
head is 0.8 bar (11 psig) and higher.
The solenoid valve is rated for continuous duty; however,
stopping on an even number stroke count insures that the
electrical power is off when pump is stopped. This practice is
safer and also eliminates unwanted strokes when the system
is shut down and electrical power is off.
THE MODEL A4 WILL PASS 4.8 mm (3/16") SOLIDS. THE M4
STALLION WILL PASS 13 mm (1/2") SOLIDS. WHENEVER
THE POSSIBILITY EXISTS THAT LARGER SOLID OBJECTS
MAY BE SUCKED INTO THE PUMP, A STRAINER SHOULD
BE USED ON THE SUCTION LINE.
SECTION 7C
OPERATING PRINCIPLES BEHIND
ACCU-FLO™ PUMPS
In Accu-Flo™ pump models, the standard air valve is replaced
with a two position, four-way solenoid valve that has a single
operator and spring return. The valve is internally air piloted
for longer coil and operator life.
When the solenoid is unpowered, one air chamber is pres-
surized with air, while the opposite chamber is exhausted.
When electric power is applied, the solenoid shifts, and the
pressurized air chamber is exhausted while the opposite
chamber is pressurized. By alternately applying and remov-
ing power, the solenoid-operated pump runs like a standard
Wilden pump.
The speed of the pump is controlled electrically. Since each
stroke is controlled by an electrical signal, the pump is ideal
for batching and other electrically controlled dispensing appli-
cations.
Although the speed of the pump is controlled electrically,
the air pressure is important. Air pressure displaces the fluid,
and if the pressure is insufficient to complete the physical
stroke before an electronic impulse signals the pump to shift,
the stroke will not be completed, and the displacement per
stroke will be reduced. This does not harm the unit in any
way, but it may cause inaccuracy when attempting to batch
specific quantities with high precision if this effect is not
taken into account.
There are three coil voltage options available. One coil allows
for 24V DC operation. The second coil option allows for
operation with either 12V DC or 24V AC at 60 Hz and the third
coil option allows for 110V AC operation.
WARNING: Before installation, consult chart in Section
10B to ensure proper electrical connection.
WARNING: The solenoid valve should not be used in
an area where explosion proof equipment is required
unless NEMA 7 valve is specified.
There are three coil options available in both NEMA 4 and
NEMA 7 ratings. One coil allows for 110V AC operation, one
allows for 24V DC operation, and the third allows for either
24V AC or 12V DC operation. Consult Section 10C for refer-
ence and part numbers.

15 WILDEN PUMP & ENGINEERING, LLCWIL-10260-E-02
ACCU-FLO™
ELECTRICAL CONNECTIONS
ACCU-FLO™
PLUMBING CONNECTIONS
SECTION 7E – ACCU-FLO™
SUGGESTED OPERATION AND
MAINTENANCE INSTRUCTIONS
OPERATION: The speed of the pump is controlled electrically.
Since each stroke is controlled by an electrical signal, the
pump is ideal for batching and other electrically controlled
dispensing applications.
Although the speed of the pump is controlled electrically,
the air pressure is important. Air pressure displaces the fluid,
and if the pressure is insufficient to complete the physical
stroke before an electronic impulse signals the pump to shift,
the stroke will not be completed, and the displacement per
stroke will be reduced. This does not harm the unit in any
way, but it may cause inaccuracy when attempting to batch
specific quantities with high precision.
The solenoid operated pump is permanently lubricated
during assembly, and requires no additional lubrication
under normal operation. If the unit runs under extreme
conditions (continuous operation at high speeds), it may
be necessary to relubricate the center block with a Buna-N
compatible NLGI Grade 2 grease every 50 million cycles.
Continuous lubrication with a compatible oil is not harmful,
and will provide longer seal life, but it may flush all grease
out of the unit.
A red button on the side of the air valve is a manual over-
ride; when actuated it will shift the valve as if an electric
current had actuated the solenoid.
RECORDS: When service is required, a record should be
made of all necessary repairs and replacements. Over a
period of time, such records can become a valuable tool
for predicting and preventing future maintenance problems
and unscheduled downtime. In addition, accurate records
make it possible to identify pumps that are poorly suited to
their applications.
MAINTENANCE AND INSPECTIONS: Since each applica-
tion is unique, maintenance schedules may be different
for every pump. Frequency of use, line pressure, viscosity
and abrasiveness of process fluid all affect the parts life
of a Wilden pump. Periodic inspections have been found
to offer the best means for preventing unscheduled pump
downtime. Personnel familiar with the pump’s construction
and service should be informed of any abnormalities that
are detected during operation. Internal maintenance is not
recommended for Accu-Flo™ solenoid air valves. When
worn or damaged, a new air valve body, coil or terminal
connector must be purchased. Please consult Section 9C
for part numbers.

16
WILDEN PUMP & ENGINEERING, LLC WIL-10260-E-02
SECTION 7F – AIR-CONTROLLED
TROUBLESHOOTING
Pump will not run or runs slowly.
1. Check air inlet screen and air filter for debris.
2. Check for sticking air valve, flush air valve in solvent.
3. Check for worn out air valve. If piston face in air valve is
shiny instead of dull, air valve is probably worn beyond
working tolerances and must be replaced.
4. Check center block Glyd™ rings. If worn excessively, they
will not seal and air will simply flow through pump and out
air exhaust. Use only Wilden Glyd™ rings as they are of
special construction and ISO 15-5 wt oil with arctic char-
acteristics.
5. Check for rotating piston in air valve.
6. Check type of lubricant being used. A higher viscosity
oil than suggested may cause the piston to stick or run
erratically. Wilden suggests the use of a hydraulic oil with
arctic characteristics (ISO 15-5 wt).
Pump runs but little or no product flows.
1. Check for pump cavitation; slow pump speed down to
match thickness of material being pumped.
2. Check for sticking ball checks. If material being pumped
is not compatible with pump elastomers, swelling may
occur. Replace ball checks and o-rings with proper elas-
tomers.
3. Check to make sure all suction connections are air tight,
especially clamp bands around intake balls.
Pump air valve freezes.
Check for excessive moisture in compressed air. Either
install dryer or hot air generator for compressed air.
Air bubbles in pump discharge.
1. Check for ruptured diaphragm.
2. Check tightness of clamp bands, especially at intake
manifold.
Product comes out air exhaust.
1. Check for diaphragm rupture.
2. Check tightness of piston plates to shaft.
Pump rattles.
1. See E9 Troubleshooting Guide.
2. Create false discharge head or suction lift.
SECTION 7G – ACCU-FLO™
TROUBLESHOOTING
Pump will not run.
1. Check for pressurized air at the inlet. (Min. 3.1 bar [45
psig].)
2. Check air inlet and filter for debris.
3. Connect a test lamp to the two wires which run to pump
and ensure that the lamp cycles on and off.
4. Make sure that the air valve manual override (small red
knob on front of valve) is switched to the “0” position.
5. Check pilot pressure vent at the top of the operator/coil
assembly to ensure that it is not clogged.
6. Check for a worn out air valve. If air continually blows out
the exhaust in very large quantities, the air valve seals
may be worn beyond their ability to function. In this case,
the valve must be replaced.
NOTE: Before the valve is scrapped, it is possible that it may
be saved by completely disassembling the valve, cleaning all
components and relubricating the valve.
Pump runs but little or no fluid comes out.
1. Check that the discharge isolation valve is not closed.
2. Check that the electronic signal is slow enough that the
pump is able to complete each physical stroke before
it is signaled to change direction. The time required to
complete the stroke is determined by a variety of factors
which include fluid viscosity and head pressure. The shaft
can be viewed if the muffler is removed to verify that the
pump is stroking.
3. Check for pump cavitation; slow pump speed down to
match the thickness of the material being pumped.
4. Check for sticking ball check valves. If the material being
pumped is not compatible with the pump elastomers,
swelling may occur. Replace ball check valves and o-ring
with the proper elastomers.
5. Check to make sure that all suction connections are air
tight, and that the clamp bands are properly tightened.
Pump air passages blocked with ice.
Check for excessive moisture in compressed air line. As
the air expands out the exhaust during the operation of
the pump, water vapor entrapped in the compressed air
can freeze and block the air passageways in the pump.
If this occurs, it may be necessary to install a coalescing
filter, 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 clamp bands, and the integrity of the
o-rings, especially at intake manifold.
Product comes out air exhaust.
1. Check for diaphragm rupture.
2. Check tightness of piston plates to shaft.
Pump rattles.
1. See E9 Troubleshooting Guide.
2. Create false discharge head or suction lift.
Solenoid buzzes or solenoid burnout.
1. Incorrect voltage, faulty or dirty solenoid.
Solenoid valve fails to shift electrically but shifts with
manual override.
1. Incorrect voltage, defective coil or wiring.
Solenoid valve fails to shift electrically or with manual
override.
1. Inadequate air supply, contamination, inadequate or
improper lubrication, mechanical binding in the valve.
Valve shifts but fails to return.
1. Broken spring, mechanical binding.
Excessive leaking from air valve vent.
1. Worn seals in air valve.

17 WILDEN PUMP & ENGINEERING, LLCWIL-10260-E-02
SECTION 8A
T4 METAL
DIRECTIONS FOR DISASSEMBLY/REASSEMBLY
Figure 1
Step 2. Figure 2
Utilizing a 1/2" wrench, remove the two small clamp bands
that fasten the discharge manifold to the liquid chambers.
Step 3. Figure 3
Lift away the discharge manifold to expose the valve balls
and seats.
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 the pump. Discon-
nect all intake, discharge, and air lines. Drain the pump by
turning it upside down and allowing any fluid to flow into
a suitable container. Be aware of any hazardous effects of
contact with your process fluid.
The Wilden T4 has a 38 mm (1-1/2") inlet and 32 mm (1-1/4")
outlet and is designed for flows up to 81 gpm (307 lpm). The
model T4 is available in aluminum, cast iron, or 316 stainless
steel wetted parts. The air valve is manufactured of brass,
PTFE-coated brass, nickel-plated brass or stainless steel.
All o-rings used in the pump are of a special material and
shore hardness which should only be replaced with factory-
supplied parts.
TOOLS REQUIRED:
Adjustable Wrench
1/2" Wrench
3/8" Box Wrench
3/16" Allen Wrench
Vise equipped with soft jaws (such as plywood, plastic
or other suitable material)
NOTE: The model used for these instructions incorporates
rubber diaphragms, balls, and seats. Models with PTFE
diaphragms, balls and seats are the same except where
noted. The procedures for A4 Accu-Flo™ pumps are the
same except for the air distribution system.
DISASSEMBLY:
Step 1.
Before starting disassembly, mark a line from each liquid
chamber to its corresponding air chamber. This line will
assist in proper alignment during reassembly.

18
WILDEN PUMP & ENGINEERING, LLC WIL-10260-E-02
Step 6. Figure 6
Remove one set of large clamp bands
which secure one liquid chamber to the
center section.
Step 7. Figure 7
Lift liquid chamber away from center
section to expose diaphragm and outer
piston.
Step 8. Figure 8
Using an adjustable wrench, or by rotat-
ing the diaphragm by hand, remove the
diaphragm assembly.
Step 4. Figure 4
Remove the discharge valve balls and seats from the liquid
chambers and inspect for nicks, gouges, chemical attack or
abrasive wear. Replace worn parts with genuine Wilden parts
for reliable performance.
Step 5. Figure 5
Remove the two small clamp bands, which fasten the intake
manifold to the liquid chambers. Lift liquid chambers and
center section from intake manifold to expose intake valve
balls and seats.