Dover WILDEN PRO-FLO P1 Series Instruction Manual

EOM-P1P 10/03
TT4139 Replaced EOM-P1P 5/03

TABLE OF CONTENTS
PAGE #
SECTION 1 — PUMP DESIGNATION SYSTEM.................................................. 1
SECTION 2—HOW IT WORKS (PUMP & AIR SYSTEMS)........................ 2
SECTION 3—CAUTIONS - READ FIRST ............................................................. 3
SECTION 4—DIMENSIONAL DRAWINGS
A. Model P1 PLASTIC ............................................................................................................... 4
B. Model P1 PLASTIC Carbon-Filled Acetal .............................................................................. 4
C. Model P1 PLASTIC Ultrapure III ........................................................................................... 5
SECTION 5—PERFORMANCE CURVES
A. Model P1 PLASTIC Rubber-Fitted......................................................................................... 6
B. Model P1 PLASTIC TPE-Fitted.............................................................................................. 6
C. Model P1 PLASTIC Teflon®-Fitted.......................................................................................... 7
D. Model P1 PLASTIC Carbon-Filled Acetal .............................................................................. 7
E. Model P1 PLASTIC Ultrapure III............................................................................................ 8
SECTION 6—SUCTION LIFT CURVES & DATA.............................................. 8
SECTION 7—INSTALLATION & OPERATION
A. Installation ............................................................................................................................. 9
B. Operation & Maintenance ...................................................................................................... 10
C. Troubleshooting...................................................................................................................... 11
SECTION 8—DIRECTIONS FOR DISASSEMBLY/REASSEMBLY
A. Model P1 PLASTIC Wetted Path —Tools Required, Torque Specs, Cautions..................... 12
B. Single-Piece Manifold Pumps —Disassembly/Reassembly................................................. 15
C. Pro-Flo™Air Valve/Center Section —Disassembly, Cleaning, Inspection........................... 17
D. Reassembly Hints & Tips .......................................................................................................19
E. Gasket Kit Installation ............................................................................................................ 20
SECTION 9—EXPLODED VIEW/PARTS LISTING
A. Model P1 PLASTIC Rubber/TPE-Fitted................................................................................. 22
B. Model P1 PLASTIC Teflon®-Fitted.......................................................................................... 24
C. Model P1 PLASTIC Ultrapure III and Carbon-Filled Acetal.................................................... 26
SECTION 10 —ELASTOMER OPTIONS.................................................................. 28
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U.S. Clean Air Act
Amendments of 1 0

1WILDEN PUMP & ENGINEERING, LLC
MODEL P1 PLASTIC MATERIAL CODES
SECTION 1
WILDEN PUMP DESIGNATION SYSTEM
WETTED PARTS
G= CARBON-FILLED ACETAL
K = PVDF
P = POLYPROPYLENE
T = TEFLON®PFA
CENTER SECTION
LL = ACETAL
PP = POLYPROPYLENE
AIR VALVE
L= ACETAL
P = POLYPROPYLENE
DIAPHRAGMS
BN = BUNA-N (Red Dot)
FG = SANIFLEX™(Cream)
PU = POLYURETHANE (Clear)
TF = TEFLON®PTFE (White)
TX = TEFLON®PTFE with integral
piston (White)
VT = VITON®(Silver or White Dot)
WF = WIL-FLEX™(Orange)
VALVE BALL
BN = BUNA-N (Red Dot)
FG = SANIFLEX™(Cream)
PU = POLYURETHANE (Brown)
TF = TEFLON®PTFE (White)
VT = VITON®(Silver or White Dot)
WF = WIL-FLEX™(Orange)
VALVE SEAT
G= CARBON-FILLED ACETAL
K = PVDF
T = TEFLON®PFA
VT = VITON®
VALVE SEAT O-RING
BN = BUNA-N (Red Dot)
CR = CHEMRAZ (UPIII)
FG = SANIFLEX™
PU = POLYURETHANE
TV = TEFLON®ENCAP.VITON®
WF = WIL-FLEX™
NOTE: MOST ELASTOMERIC MATERIALS USE COLORED DOTS FOR IDENTIFICATION.
Viton are registered trademarks of DuPont Dow Elastomers.
Teflon is a registered trademark of DuPont.

2
WILDEN PUMP & ENGINEERING, LLC
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 valve directs pressurized air to
the back side of diaphragm A. The compressed air is
applied directly to the liquid column separated by
elastomeric diaphragms. The diaphragm acts as a
separation membrane between the compressed air
and liquid, balancing the load and removing
mechanical 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 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
block of the pump creates a vacuum within chamber
B. Atmospheric pressure forces fluid into the inlet
manifold 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 movement of diaphragm A
toward the center block of the pump creates a
vacuum within liquid chamber A. Atmospheric pres-
sure forces fluid into the inlet manifold 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 consti-
tutes one complete pumping cycle. The pump may
take several cycles to completely prime depending
on the conditions of the application.
PRO-FLO™AIR DISTRIBUTION SYSTEM
OPERATION —HOW IT WORKS
The Pro-Flo™patented air distribution
system incorporates three moving parts:
the air valve spool, the pilot spool, and the
main shaft/diaphragm assembly. The heart
of the system is the air valve spool and air
valve. As shown in Figure A, this valve
design incorporates an unbalanced spool.
The smaller end of the spool is pressurized
continuously, while the large end is alter-
nately pressurized then exhausted to
move the spool. The spool directs pres-
surized air to one air chamber while
exhausting the other. The air causes the
main shaft/diaphragm assembly to shift to
one side —discharging liquid on that side
and pulling liquid in on the other side.
When the shaft reaches the end of its
stroke, the inner piston actuates the pilot
spool, which pressurizes and exhausts the
large end of the air valve spool. The repo-
sitioning of the air valve spool routes the
air to the other air chamber.
Figure A

3WILDEN PUMP & ENGINEERING, LLC
SECTION 3
WILDEN MODEL P1 PLASTIC
CAUTIONS –READ FIRST!
TEMPERATURE LIMITS:
Polypropylene 0°C to 79°C32°F to 175°F
PVDF –12°C to 107°C10°F to 225°F
Carbon-Filled
Acetal –28.9°C to 65.6°C–20°F to 150°F
Teflon®PFA –28.9°C to 148.9°C–20°F to 300°F
Neoprene –17.8°C to 93.3°C0°F to 200°F
Buna-N –12.2°C to 82.2°C10°F to 180°F
Nordel®–51.1°C to 137.8°C–60°F to 280°F
Viton®–40°C to 176.7°C–40°F to 350°F
Wil-Flex™–40°C to 107.2°C–40°F to 225°F
Polyurethane 12.2°C to 65.6°C10°F to 150°F
Saniflex™–28.9°C to 104.4°C–20°F to 220°F
Teflon®PTFE 4.4°C to 104.4°C40°F to 220°F
CAUTION: When choosing pump materials, be sure to
check the temperature limits for all wetted compo-
nents. Example: Viton®has a maximum limit of 176.7°C
(350°F) but polypropylene has a maximum limit of only
79°C (175°F).
CAUTION: Maximum temperature limits are based
upon mechanical stress only. Certain chemicals will
significantly reduce maximum safe operating tempera-
tures. Consult engineering guide for chemical compat-
ibility and temperature limits.
CAUTION: Always wear safety glasses when operat-
ing pump. If diaphragm rupture occurs, material being
pumped may be forced out air exhaust.
WARNING: Prevention of static sparking —If static
sparking occurs, fire or explosion could result. Pump,
valves, and containers must be properly grounded
when handling flammable fluids and whenever
discharge of static electricity is a hazard.
CAUTION: Do not exceed 8.6 Bar (125 psig) air
supply pressure.
CAUTION: Plastic series pumps are made of virgin
plastic and are not UV stabilized. Direct sunlight for
prolonged periods can cause deterioration of plastics.
CAUTION: Before any maintenance or repair is
attempted, the compressed air line to the pump should
be disconnected and all air pressure allowed to bleed
from pump. Disconnect all intake, discharge and air
lines. Drain the pump by turning it upside down and
allowing any fluid to flow into a suitable container.
CAUTION: Blow out air line for 10 to 20 seconds
before attaching to pump to make sure all pipe line
debris is clear. Use an in-line air filter. A 5µ(micron) air
filter is recommended.
NOTE: Tighten clamp bands prior to installation.
Fittings may loosen during transportation.
NOTE: When installing Teflon®diaphragms, it is
important to tighten outer pistons simultaneously (turn-
ing in opposite directions) to ensure tight fit.
NOTE: Before starting disassembly, mark a line from
each liquid chamber to its corresponding air chamber.
This line will assist in proper alignment during reassembly.
CAUTION: Verify the chemical compatibility of the
process and cleaning fluid to the pump’s component
materials in the Chemical Resistance Guide (see E4).
NOTE: Carbon-filled acetal pumps are shipped with a
grounding strap. The strap is attached to the manifold
clamp band bolt. This strap must be attached via the
clip to a proper grounding point.
CAUTION: Only explosion proof (NEMA 7) solenoid
valves should be used in areas where explosion proof
equipment is required.
NOTE: Non lube-free pumps must be lubricated.
Wilden suggests an arctic 5 weight oil (ISO grade 15).
Do not over-lubricate air supply. Over-lubrication will
reduce pump performance.
NOTE: P1 Plastic Teflon®-fitted pumps come standard
from the factory with expanded Teflon®gaskets. (See
Gasket Kit Installation in Section 8F.)
CAUTION: Do not over-tighten the air valve bolts. Too
much torque on the air valve bolts may damage the air
valve muffler plate. Do not exceed 3.3 N•m [29 in.-lbs.].

4
WILDEN PUMP & ENGINEERING, LLC
SECTION 4A
DIMENSIONAL DRAWING
WILDEN MODEL P1 PLASTIC
DIMENSIONS –P1 (PLASTIC)
ITEM METRIC (mm) STANDARD (inch)
A 31 1.2
B 130 5.1
C 196 7.7
D 208 8.2
E 218 8.6
F 56 2.2
G 114 4.5
H 127 5.0
J 203 8.0
K 145 5.7
L 114 4.5
M 84 3.3
N 102 4.0
P 8 0.3
R 20 0.8
S 28 1.1
DIMENSIONS –P1 CARBON-FILLED ACETAL
WITH ONE-PIECE MANIFOLD (PLASTIC)
ITEM METRIC (mm) STANDARD (inch)
A 224 8.8
B 25 1.0
C 133 5.2
D 216 8.5
E 231 9.1
F 53 2.1
G 25 1.0
H 114 4.5
J 140 5.5
K 203 8.0
L 8 0.3
M 8 3.3
N 104 4.1
P 117 4.6
R 147 5.8
S 25 1.0
SECTION 4B
DIMENSIONAL DRAWING
WILDEN MODEL P1 PLASTIC
CARBON-FILLED ACETAL
6 mm (1/4”)
FNPT AIR
INLET
6 mm (1/4”)
FNPT AIR
INLET
13 mm (1/2”) FNPTAIR
EXHAUST
13 mm (1/2”) FNPT
13 mm
(1/2”) FNPT
13 mm (1/2”) FNPTAIR
EXHAUST
S - POLY & PVDF R - TEFLON®& GRAPHITE
13 mm (1/2”) FNPT
ULTRAPURE .615 I.D. [15.62]
.844 O.D. [21.44]
13 mm (1/2”) FNPT
ULTRAPURE .615 I.D. [15.62]
.844 O.D. [21.44]
A
K
L
MN
P
A
L
MN
P
S
R
B
C
DE
F H
G
J
K
R
S
B
C
D
E
F G
J
H

5WILDEN PUMP & ENGINEERING, LLC
SECTION 4C
DIMENSIONAL DRAWING
WILDEN MODEL P1 PLASTIC ULTRAPURE III
DIMENSIONS –P1 (ULTRAPURE III)
ITEM METRIC (mm) STANDARD (inch)
A 226 8.9
B 23 0.9
C 132 5.2
D 213 8.4
E 229 9.0
F 25 1.0
G 132 5.2
H 56 2.2
J 114 4.5
K 201 7.9
L 8 0.3
M 76 3.0
N 102 4.0
P 114 4.5
R 142 5.6
FOR BONDABLE TEE SECTION
S 83 3.3
All P1 Ultrapure pumps are assembled
in a Class 10,000 cleanroom.
6 mm
(1/4”)
FNPT AIR
INLET
13 mm (1/2”) FNPT
13 mm
(1/2”) FNPT
AIR EXHAUST
13 mm (1/2”) FNPT
SF
G
JH KA
S
PR
MN
L
F
B
C
DE

6
WILDEN PUMP & ENGINEERING, LLC
SECTION 5A
PERFORMANCE CURVES
MODEL P1 PLASTIC RUBBER-FITTED
Height....................................218 mm (8.6")
Width.....................................208 mm (8.2")
Depth.....................................203 mm (8.0")
Ship Weight.................Polypropylene 4 kg (9 lbs.)
PVDF 5 kg (11 lbs.)
Carbon-filled Acetal 5 kg (10 lbs.)
Teflon®PFA 6 kg (12 lbs.)
Air Inlet.........................................6 mm (1⁄4")
Inlet............................................13 mm (1⁄2")
Outlet..........................................13 mm (1⁄2")
Suction Lift............................6.1 m Dry (20')
9.5 m Wet (31')
Displacement per
Stroke.......................... .11 l (0.029 gal.)1
Max. Flow Rate.............56.0 lpm (14.8 gpm)
Max. Size Solids.....................1.59 mm (1⁄16")
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 18.9 lpm (5 gpm) against
a discharge pressure head of 2.7 bar (40 psig)
requires 3.93 bar (57 psig) and 5.07 Nm3/h
(3 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.
SECTION 5B
PERFORMANCE CURVES
WILDEN P1 PLASTIC TPE-FITTED
Height....................................218 mm (8.6")
Width.....................................208 mm (8.2")
Depth.....................................203 mm (8.0")
Ship Weight.................Polypropylene 4 kg (9 lbs.)
PVDF 5 kg (11 lbs.)
Carbon-filled Acetal 5 kg (10 lbs.)
Teflon®PFA 6 kg (12 lbs.)
Air Inlet.........................................6 mm (1⁄4")
Inlet............................................13 mm (1⁄2")
Outlet..........................................13 mm (1⁄2")
Suction Lift............................5.8 m Dry (19')
9.8 m Wet (32')
Displacement per
Stroke.......................... .11 l (0.030 gal.)1
Max. Flow Rate................56.8 lpm (15 gpm)
Max. Size Solids.....................1.59 mm (1⁄16")
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 18.9 lpm (5 gpm) against
adischarge pressureheadof 2.7bar(40 psig)
requires 3.93 bar (57 psig) and 5.07 Nm3/h
(3 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.

7WILDEN PUMP & ENGINEERING, LLC
SECTION 5C
PERFORMANCE CURVES
MODEL P1 PLASTIC TEFLON®-FITTED
Height....................................218 mm (8.6")
Width.....................................208 mm (8.2")
Depth.....................................203 mm (8.0")
Ship Weight.................Polypropylene 4 kg (9 lbs.)
PVDF 5 kg (11 lbs.)
Carbon-filled Acetal 5 kg (10 lbs.)
Teflon®PFA 6 kg (12 lbs.)
Air Inlet.........................................6 mm (1⁄4")
Inlet............................................13 mm (1⁄2")
Outlet..........................................13 mm (1⁄2")
Suction Lift..........................5.18 m Dry (17')
9.8 m Wet (32')
Displacement per
Stroke.......................... .10 l (0.027 gal.)1
Max. Flow Rate.............53.4 lpm (14.1 gpm)
Max. Size Solids.....................1.59 mm (1⁄16")
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 18.9 lpm (5 gpm) against
a discharge pressure head of 2.7 bar (40 psig)
requires 3.86 bar (56 psig) and 6.93 Nm3/h
(4.1 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.
SECTION 5D
PERFORMANCE CURVES
MODEL P1 PLASTIC CARBON-FILLED ACETAL
Height....................................231 mm (9.1")
Width.....................................224 mm (8.8")
Depth.....................................203 mm (8.0")
Ship Weight.................Polypropylene 4 kg (9 lbs.)
PVDF 5 kg (11 lbs.)
Carbon-filled Acetal 5 kg (10 lbs.)
Teflon®PFA 6 kg (12 lbs.)
Air Inlet.........................................6 mm (1⁄4")
Inlet .............................................13 cm (1⁄2")
Outlet...........................................13 cm (1⁄2")
Suction Lift..........................3.66 m Dry (12')
9.5 m Wet (31')
Displacement per
Stroke.......................... .09 l (0.024 gal.)1
Max. Flow Rate.............51.1 lpm (13.5 gpm)
Max. Size Solids......................3.18 mm (1⁄8")
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 18.9 lpm (5 gpm) against
adischarge pressureheadof 2.7bar(40 psig)
requires 4.34 bar (63 psig) and 6.76 Nm3/h
(4 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.

8
WILDEN PUMP & ENGINEERING, LLC
SECTION 6
SUCTION LIFT CURVES & DATA
Height....................................229 mm (9.0")
Width.....................................226 mm (8.9")
Depth.....................................201 mm (7.9")
Ship Weight................................
6 kg (12 lbs.)
Air Inlet.........................................6 mm (1⁄4")
Inlet............................................13 mm (1⁄2")
Outlet..........................................13 mm (1⁄2")
Suction Lift............................3.7 m Dry (12')
9.5 m Wet (31')
Displacement per
Stroke.......................... .09 l (0.023 gal.)1
Max. Flow Rate.............49.6 lpm (13.1 gpm)
Max. Size Solids......................3.18 mm (1⁄8")
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 18.9 lpm (5 gpm) against
a discharge pressure head of 2.7 bar (40 psig)
requires 4.69 bar (68 psig) and 6.59 Nm3/h
(3.9 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.
Suction lift curves are calibrated for pumps operating at 305 m
(1,000') 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.
SECTION 5E
PERFORMANCE CURVES
WILDEN MODEL P1 PLATIC ULTRAPURE III

9WILDEN PUMP & ENGINEERING, LLC
SECTION 7A
INSTALLATION
The Pro-Flo™model P1 has a 13 mm (¹⁄₂") inlet and 13 mm
(¹⁄₂") outlet and is designed for flows to 56.8 lpm (15 gpm).
The P1 Plastic pump is manufactured with wetted parts of
pure, unpigmented PVDF, carbon-filled Acetal, Teflon®PFA or
polypropylene. The P1 Plastic is constructed with a
polypropylene center section. A variety of diaphragms and o-
rings are available to satisfy temperature, chemical compati-
bility, abrasion and flex concerns.
The suction pipe size should be at least 13 mm (¹⁄₂") diame-
ter or larger if highly viscous material is being pumped. The
suction hose must be non-collapsible, reinforced type as the
P1 is capable of pulling a high vacuum. Discharge piping
should be at least 13 mm (¹⁄₂"); 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 selec-
tion 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 instal-
lation process.
LOCATION: Noise, safety, and other logistical factors usually
dictate where equipment be situated on the production floor.
Multiple installations with conflicting requirements can result
in congestion of utility areas, leaving few choices for addi-
tional pumps.
Within the framework of these and other existing conditions,
every pump should be located in such a way that five key factors
are balanced against each other to maximum advantage.
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.
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 Section 5). Use air
pressure up to a maximum of 8.6 bar (125 psig) depending
on pumping requirements.
For best results, the pumps should use a 5 micron air filter,
needle valve and regulator. The use of an air filter before the
pump will insure that the majority of any pipeline contami-
nants will be eliminated.
SOLENOID OPERATION: When operation is controlled by a
solenoid valve in the air line, three-way valves should be
used, thus allowing trapped air to bleed off and improving
pump performance. Pumping volume can be set by counting
the number of strokes per minute and multiplying by
displacement per stroke.
Sound levels are reduced below OSHA specifications using
the standard Wilden muffler element. Other mufflers can be
used but usually reduce pump performance.
ELEVATION: Selecting a site that is well within the pump’s
dynamic 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 site location.
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 inad-
vertent restrictions are not created for any remaining sites.
The best choice possible will be a site involving the shortest
and 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 inde-
pendently of the pump. In addition, the piping should be
aligned so as to avoid placing stresses on the pump fittings.
Flexible hose 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 location, a mount-
ing pad placed between the pump and the foundation will
assist in minimizing pump vibration. Flexible connections
between the pump and rigid piping will also assist in mini-
mizing 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.
For P1 Plastic models, a non-raised surfaced-flange
adapter should be utilized when mating to the pump’s inlet
and discharge manifolds for proper sealing.
The P1 can be installed in submersible applications only
when both the wetted and non-wetted portions are compat-
ible 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 and pilot spool exhaust ports and
piped above the liquid level. The exhaust area for the pilot
spool is designed to be tapped for a ¹⁄₈" NPT fitting.
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 model’s ability. Note: Materials of construction
and elastomer material have an effect on suction lift para-
meters. Please consult Wilden distributors for specifics.
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 10
psig and higher.
THE MODEL P1 PLASTIC WILL PASS 1.6 MM (1⁄16") 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.
¹⁄₂"

10
WILDEN PUMP & ENGINEERING, LLC
SUGGESTED INSTALLATION
®
SECTION 7B
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 regulate
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 P1 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 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.
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.
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.

11 WILDEN PUMP & ENGINEERING, LLC
SECTION 7C
TROUBLESHOOTING
Pump will not run or runs slowly.
1. Ensure that the air inlet pressure is at least 0.4 bar (5 psig)
above startup pressure and that the differential pressure
(the difference between air inlet and liquid discharge pres-
sures) is not less than 0.7 bar (10 psig).
2. Check air inlet filter for debris (see recommended installa-
tion).
3. Check for extreme air leakage (blow by) which would indi-
cate worn seals/bores in the air valve, pilot spool and main
shaft.
4. Disassemble pump and check for obstructions in the air
passageways or objects which would obstruct the move-
ment of internal parts.
5. Check for sticking ball check valves. If material being
pumped is not compatible with pump elastomers, swelling
may occur. Replace ball check valves and seals with proper
elastomers. Also, as the check valve balls wear out, they
become smaller and can become stuck in the seats. In this
case, replace balls and seats.
6. Check for broken inner piston which will cause the air valve
spool to be unable to shift.
7. Remove plug from pilot spool exhaust.
Pump runs but little or no product flows.
1. Check for pump cavitation; slow pump speed down to
allow thick material to flow into the liquid chambers.
2. Verify that vacuum required to lift liquid is not greater than the
vapor pressure of the material being pumped (cavitation).
3. Check for sticking ball check valves. If material being
pumped is not compatible with pump elastomers, swelling
may occur. Replace ball check valves and seals with proper
elastomers. Also, as the check valve balls wear out, they
become smaller and can become stuck in the seats. In this
case, replace balls and seats.
Pump air valve freezes.
1. Check for excessive moisture in compressed air. Either
install a dryer or hot air generator for compressed air. Alter-
natively, a coalescing filter may be used to remove the
water from the compressed air in some applications.
Air bubbles in pump discharge.
1. Check for ruptured diaphragm.
2. Check tightness of outer pistons. (Refer to Section 8C.)
3. Check tightness of clamp bands and integrity of o-rings
and seals, especially at intake manifold.
4. Ensure pipe connections are airtight.
Product comes out air exhaust.
1. Check for diaphragm rupture.
2. Check tightness of outer pistons to shaft.

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WILDEN PUMP & ENGINEERING, LLC
SECTION 8A
MODEL P1 PLASTIC
DIRECTIONS FOR DISASSEMBLY/REASSEMBLY
Step 2. Figure 2
Utilizing the 10 mm (³⁄₈") box wrench, start by removing the
four long carriage bolts that hold the top and bottom mani-
folds to the center section. (Figure 2)
Step 3. Figure 3
Remove the top manifold and lift the center section off the
inlet manifold. (Figure 3)
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. 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. Be aware of any hazardous effects of contact with
your process fluid.
The Wilden model P1 has a 13 mm (¹⁄₂") inlet and outlet and is
designed for flows up to 56.8 lpm (15 gpm). The single-piece
center section, consisting of center block and air chambers, is
molded of polypropylene or acetal. All fasteners and hardware
are stainless steel and the air valve is manufactured of brass or
high-tech engineered thermoplastic. Its air distribution system
is based on a revolutionary design, which offers economical
reliability and performance. The model P1 Plastic is available in
injection-molded polypropylene, PVDF, carbon-filled acetal,
and Teflon®PFA wetted parts.
TOOLS REQUIRED:
8 mm (⁵⁄₁₆") Wrench
5 mm (³⁄₁₆") Allen Wrench
10 mm (³⁄₈") Wrench
11 mm (⁷⁄₁₆") Wrench
Adjustable 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 Teflon®
diaphragms, balls and seats are the same except where noted.
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. (Figure 1)
Figure 1

13 WILDEN PUMP & ENGINEERING, LLC
Step 4. Figure 4
Remove the discharge valve balls, seats and o-rings from
the discharge manifold and inspect for nicks, gouges,
chemical attack or abrasive wear. Replace worn parts with
genuine Wilden parts for reliable performance. Teflon®
o-rings should be replaced when reassembled. (Figure 4)
Step 5. Figure 5
Remove and inspect the ball retainer, retainer o-ring, and
valve ball from the bottom of the liquid chamber. Check for
nicks, gouges, chemical attack or abrasive wear. Replace
worn parts with genuine Wilden parts for reliable perfor-
mance. Teflon®o-rings should be replaced when reassem-
bled. (Figure 5)
Step 6. Figure 6
Normally the inlet and discharge mani-
fold should not be disassembled during
regular pump maintenance. Should this
be necessary completely remove and
disassemble manifold clamp bands.
(Figure 6)
Step 7. Figure 7
Inspect o-rings for wear or damage and
replace if necessary. Teflon®o-rings
should be replaced when reassembled.
(Figure 7)
Step 8. Figure 8
Use a 11 mm (⁷⁄₁₆") wrench to remove
one set of clamp bands that secure one
liquid chamber to the one-piece center
section. (Figure 8)

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WILDEN PUMP & ENGINEERING, LLC
Step 9. Figure 9
Lift the liquid chamber away from the center section to
expose the diaphragm and outer piston. (Figure 9)
Step 10. Figure 10
Using an adjustable wrench, or by rotating the diaphragm by
hand, remove the diaphragm assembly from the center
section. (Figure 10)
Step 11A. Figure 11A
NOTE: Due to varying torque values,
one of the following two situations may
occur: 1) The outer piston, diaphragm
and inner piston remain attached to the
shaft and the entire assembly can be
removed from the center section.
(Figure 11A)
Step 11B. Figure 11B
2) The outer piston, diaphragm, inner
piston, and disc spring separate from
the shaft which remains connected to
the opposite side diaphragm assembly
(Figure 11B). Teflon®-fitted pumps come
standard with back-up diaphragms (not
shown). NOTE: Disc spring not shown
on Figure 11B.
Step 12. Figure 12
To remove the diaphragm assembly
from the shaft, secure shaft with soft
jaws (a vise fitted with plywood or other
suitable material) to ensure shaft is not
nicked, scratched, or gouged. Using an
adjustable wrench, remove diaphragm
assembly from shaft. Inspect all parts for
wear and replace with genuine Wilden
parts if necessary. (Figure 12)

15 WILDEN PUMP & ENGINEERING, LLC
CAUTION: Before any maintenance or repair is attempted,
the compressed air line to the pump should be discon-
nected 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.
The Wilden single-piece manifold pump models are air-
operated, double-diaphragm pumps with all wetted parts
molded in Teflon®PFA and carbon-filled acetal. The single-
piece center section, consisting of center block and air
chambers, is molded from glass-filled polypropylene on
UPIII models and glass-filled acetal on conductive
models. All fasteners and hardware are stainless steel. The
primary diaphragm is constructed of Teflon®PTFE. All
wetted sealing o-rings are Teflon®encapsulated Viton®on
the UPII and carbon-filled acetal and Chemraz®on the
UPIII. The standard air distribution system is used on the
UPII. All o-rings used in the pump are of a special mater-
ial, and should only be replaced with Wilden factory-
supplied parts.
Tools required to perform maintenance on the Model P1
pump are: ³⁄₁₆-inch, ⁵⁄₁₆-inch and ⁹⁄₁₆-inch Allen wrench,
⁷⁄₁₆-inch wrench, two open end adjustable wrenches, and
an o-ring pick.
PLEASE read all directions before starting disassembly.
NOTE: The UPIII pump is photographed for the assembly
instructions. The carbon-filled acetal instructions are the
same unless noted.
DISASSEMBLY:
Before actual disassembly is started, turn pump upside down
and drain all liquid trapped in the pump into a suitable
container. Be sure to use proper caution if liquid is corrosive
or toxic. Mark each liquid chamber to its respective air
chamber for easy alignment during reassembly.
P1 Carbon-filled Acetal
P1 UPIII Teflon®PFA Construction
SECTION 8B –SINGLE-PIECE MANIFOLD PUMPS
DIRECTIONS FOR
DISASSEMBLY/REASSEMBLY

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WILDEN PUMP & ENGINEERING, LLC
Step 1. Figure 1
Using an appropriate sized Allen
wrench, remove clamp bands that hold
the discharge manifold to the water
chambers.
NOTE: Carbon-filled acetal pumps are
shipped with a grounding strap. The
strap is attached to the manifold clamp
band bolt. This strap must be attached
via the clip to a proper grounding point.
Step 2. Figure 2
Remove discharge manifold. It is now
possible to inspect the outboard o-rings.
NOTE: The carbon-filled Acetal pump
has a removable end plug. Teflon®tape
must be used to assure a proper seal.
End plug placement will vary depending
upon installation logistics.
Step 3. Figure 3
Remove the o-ring, ball cage and ball
valve from the water chamber. It is now
possible to inspect these parts (see
Figure 3). Using the o-ring pick, remove
the seat and seat o-ring from the water
chamber for further inspection. If
swelling, cracking or other damage is
apparent, these parts must be replaced.
Step 4. Figure 4
Loosen and remove clamp bands from
around the inlet manifold (see Figure 4).
Step 5. Figure 5
Lift center section off of the inlet mani-
fold (see Figure 5). It is now possible to
inspect the outboard o-rings on the inlet
manifold.
Step 6. Figure 6
Place center section upside-down on a
flat surface. Remove the o-ring, seat and
valve ball from the bottom of the water
chamber. It is now possible to inspect
these parts. If swelling, cracking or other
damage is apparent these parts must be
replaced (see Figure 6).

17 WILDEN PUMP & ENGINEERING, LLC
Step 2. Figure 2
Remove muffler plate and air valve bolts
from air valve assembly (Figure 2)
exposing muffler gasket for inspection.
Replace if necessary.
Step 3. Figure 3
Lift away air valve assembly and remove
air valve gasket for inspection (Figure 3).
Replace if necessary.
Step 4. Figure 4
Remove air valve end cap to expose air
valve spool by simply lifting up on end
cap once air valve bolts are removed.
(Figure 4).
SECTION 8C
PRO-FLO™AIR VALVE/CENTER SECTION
DISASSEMBLY, CLEANING, INSPECTION
Step 1. Figure 1
Loosen the air valve bolts utilizing a ³⁄₁₆" hex head wrench.
(Figure 1)
AIR VALVE DISASSEMBLY:
CAUTION: Before any maintenance or repair is attempted,
the compressed air line to the pump should be discon-
nected and all air pressure allowed to bleed from the
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. Be aware of hazardous
effects of contact with your process fluid.
The Wilden Plastic P1 utilizes a revolutionary Pro-Flo™
air distribution system. A 13 mm (¹⁄₂") air inlet connects
the air supply to the center section. Proprietary compos-
ite seals reduce the coefficient of friction and allow the
P1 to run lube-free. Constructed of acetal or polypropy-
lene, the Pro-Flo™air distribution system is designed to
perform in on/off, non-freezing, non-stalling, tough duty
applications.
TOOLS REQUIRED:
³⁄₁₆" Hex Head Wrench
⁷⁄₃₂" Hex Head Wrench
Snap Ring Pliers
O-Ring Pick

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WILDEN PUMP & ENGINEERING, LLC
Step 7. Figure 7
Remove pilot spool sleeve from center
section (Figure 7).
Step 8. Figure 8
With o-ring pick, gently remove the o-ring
from the opposite side of the “center hole”
cut on the spool. Gently remove the pilot
spool from sleeve and inspect for nicks or
gouges and other signs of wear. Replace
pilot sleeve assembly or outer sleeve
o-rings if necessary. During re-assembly
never insert the pilot spool into the sleeve
with the “center cut”side first, this end
incorporates the urethane o-ring and will
be damaged as it slides over the ports cut
in the sleeve.
NOTE: Seals should not be removed
from pilot spool.
Seals are not sold separately.
Step 9. Figure 9
Check center section Glyd™rings for
signs of wear. If necessary, remove
Glyd™rings with o-ring pick and
replace. (Figure 9)
Step 5. Figure 5
Remove air valve spool from air valve body by threading one air
valve bolt into the end of the spool and gently sliding the spool
out of the air valve body (Figure 5). Inspect seals for signs of
wear and replace entire assembly if necessary. Use caution
when handling air valve spool to prevent damaging seals.
NOTE: Seals should not be removed from assembly.
Seals are not sold separately.
Step 6. Figure 6
Remove pilot spool sleeve retaining snap ring on both sides
of center section with snap ring pliers (Figure 6).