Pentair Berkeley BVM Series Guide

Record the following information from the motor and pump
nameplates for future reference:
Pump Model No.
Bill of Material No.
Motor Model No.
Motor Serial No.
H.P. Volts/Hz/Ph
Rated Amp Draw
293 WRIGHT STREET, DELAVAN, WI 53115 www.BerkeleyPumps.com
PH: 888-237-5353
© 2014 Pentair, Ltd. All Rights Reserved. BE991 (12/12/14)
INSTALLATION, OPERATION, & PARTS MANUAL
Vertical Multistage Pumps
490 PINEBUSH ROAD, UNIT 4, CAMBRIDGE, ONTARIO N1T 0A5
PH: 8003637867 ORDERS FAX: 8886065484

2
TABLE OF CONTENTS
Safety Instructions ...........................................................2
Applications and Operating Ranges ................................2
Installation ......................................................................3
Electrical .........................................................................4
Operation........................................................................ 5
Maintenance ...................................................................6
Troubleshooting ............................................................10
Warranty .......................................................................11
Repair Parts ...................................................................12
Dimensions...................................................................20
IMPORTANT SAFETY
INSTRUCTIONS
SAVE THESE INSTRUCTIONS - This manual contains
important instructions that should be followed during
installation, operation, and maintenance of the product.
Save this manual for future reference.
This is the safety alert symbol. When you see this
symbol on your pump or in this manual, look for one of
the following signal words and be alert to the potential
for personal injury!
indicates a hazard which, if not avoided, will
result in death or serious injury.
indicates a hazard which, if not avoided,
could result in death or serious injury.
indicates a hazard which, if not avoided,
could result in minor or moderate injury.
NOTICE addresses practices not related to personal injury.
To avoid serious or fatal personal injury and possible
property damage, carefully read and follow the safety
instructions.
1. Install pump according to all code requirements.
2. Compare pump nameplate data with desired
operating range.
3. Pump only liquids compatible with pump
component materials (that is, liquids that will not
attack the pump).
4. Make sure plumbing is adequate to handle system
pressure.
5. Periodically perform maintenance inspection on
pump and system components.
6. Wear safety glasses at all times when working
onpumps.
California Proposition 65 Warning
This product and related accessories contain
chemicals known to the State of California to cause
cancer, birth defects or other reproductive harm.
Inspect the Shipment
The vertical multistage centrifugal inline pump has been
carefully inspected and packaged to assure safe delivery.
Inspect the pump and fittings and report to the carrier
any items which are damaged or missing.
Confirm that you have the right pump:
Applications and Operating Ranges.
Berkeley multistage in-line centrifugal pumps are
designed for liquid transfer, circulation, and pressure
boosting of hot or cold clean water or other thin, non-
explosive liquids, not containing solid particles or fibers,
which will not chemically attack the pump materials.
Typical applications include:
• Municipalwatersupplyandpressureboosting
• Boilerfeedandcondensatesystems
• Coolingwatersystems
• Irrigation
• Firefighting
Maximum Ambient Temperature ........104°F(40°C)
Liquid Temperature Range ............. 5°Fto248°F
(-15° C to +120° C)
Maximum Permissible Operating Pressure
 FlowSeries1through20 .................360 psi
 FlowSeries33through150 ...............435 psi
Maximum operating pressure = Inlet pressure +
maximum pump differential head
Electrical Data: ...............See Motor Nameplate
Dimensions and Port-to-Port
Lengths : ........................See pages 20-53
Figure 1 - Model Plate Information

3
INSTALLATION
Risk of electric shock. Can shock, burn or
kill. Ground pump motor correctly before connecting
topowersupply,perarticle250-80oftheNational
Electrical Code (NEC) in the U.S., or the Canadian
Electrical Code (CEC), as applicable.
Location
Locate pump in a dry, well ventilated area, not subject to
freezing or extreme variations in temperature.
Mount pump a minimum of 6” from any obstruction
or hot surface. Install the pump with the motor shaft
vertical. Make sure that an adequate supply of cool air
reaches the motor cooling fan. Maximum ambient air
temperatureis104°F(40°C).
Foropensystemsrequiringsuctionlift,locatethepump
as close to the water source as possible.
Foundation
Foundationshouldbeconcreteorasimilarlyrigid
foundation to provide a secure, stable mounting base for
the pump.
Secure pump to foundation using all bolt holes. Refer to
pages 23-53 for bolt plate dimensions. Be sure that all
four pads on the base are properly supported.
Shim pump base to make sure that pump is level.
Piping
Risk of explosion and scalding. Do not run
pump with discharge valve closed; the water in the
pump may boil, with risk of explosion and steam burns
to anyone near.
If there is any danger of the pump running against a
closed discharge valve, install a pressure relief or by-pass
valve in the discharge pipe to allow for minimum liquid
flow through the pump. Minimum liquid flow through
the pump is needed for cooling and lubrication of the
pump (See Table I). Run the bypass/relief valve and
discharge pipe to a floor drain or a tank for collection.
Suction pipe should be adequately sized (See Table II)
and run as straight and as short as possible to keep
friction losses to a minimum. Pipes, valves, and fittings
must have a pressure rating equal to or greater than the
maximum system pressure.
Pressure check the discharge piping as required by codes
or local regulations.
“Inlet” and “Outlet” are marked on the pump base to
show the direction of the liquid flow through the pump.
Install anti-vibration mountings on either side of the
pump if a minimum noise level is desired.
Install isolation valves in both inlet and outlet pipes near
thepump(seeFigure2).Thisallowsforremovalofpump
for service without draining the system and isolation of
the pump in case of a flooded suction condition.
Table I – Minimum Pumping Rates
Flow Series Minimum Pumping Rate
BVM(I/X)1 1.0 GPM
BVM(I/X)3 6.5 GPM
BVM(I/X)5 13 GPM
BVM(I/X)10 25 GPM
BVM(I/X)15 45 GPM
BVM(I/X)20 50 GPM
BVM(I/X)33 80GPM
Table II – Minimum Suction Pipe Sizes
Flow Series
Minimum Nominal
Suction Pipe Size
BVM(I/X)1
BVM(I/X)3
BVM(I/X)5
1.25 inches
BVM(I/X)10
BVM(I/X)15
BVM(I/X)20
2 inches
BVM(I/X)33 2.5 inches
Figure 2 - Bypass required if pump might operate
with discharge valve closed. See Table I for minimum
required flow through pump to prevent overheating
and to ensure lubrication.
4218 0702
Inlet Outlet
Nipple
Orifice
Bypass Line
12" Min.
to prevent
erosion
Isolation Valves

4
If the system pressure is greater than the pump’s
maximum inlet pressure the limits of the pump can
be exceeded if the discharge pressure backs up to the
inlet side of the pump. Installation of a check valve
in the discharge pipe is recommended to prevent this
condition.
Make sure, especially on the inlet side of the pump,
thattherearenoairlocksinthesystem.SeeFigure3for
correct pipe work to avoid airlocks. The suction pipe
should be level or slightly rising.
Support all piping independently of the pump so the
weight of the piping system does not strain the pump
case. Make sure that the expansion and contraction of
the piping system from temperature variations cannot put
a strain on the pump.
If the system or pump must be drained periodically
(especially if the discharge pipe is horizontal or slopes
downward away from the pump), install a loop and
vacuumvalveasshowninFigure4toprotectthepump
against running dry. The highest point of the loop should
be at least as high as the lowest point of the motor. This
loop/valve combination will allow the pump and the
system to be drained independently of one another.
ELECTRICAL
Risk of electric shock. Can shock, burn
or kill. All electrical work should be performed by a
qualified electrician in accordance with the National
Electrical Code and all local codes and regulations.
Make sure that the motor voltage, phase, and frequency
match the incoming electrical supply. The proper
operating voltage and other electrical information can
be found on the motor nameplate. These motors are
designed to run up to ±10% of the nameplate-rated
voltage. The wiring connection diagram can be found
on either a plate attached to the motor or on a diagram
inside the terminal box cover.
• If voltage variations are greater than ±10% do not
operate the pump.
• Incorrectvoltagecancausefireorseriousdamageto
the motor and voids warranty.
• Groundthepumpmotorcorrectlybeforeconnecting
it to the power supply.
• Followthewiringinstructionswhenconnectingthe
motor to the power lines.
Position of Terminal Box
To turn the motor so that the terminal box faces the right
direction, proceed as follows:
1. Disconnect the power to the pump motor.
2. Remove the coupling guards (use a screwdriver).
3. Remove the couplings.
4. Remove the bolts that fasten the motor to the pump.
5. Turn the motor to the required position (in quarter-
turn increments).
6. Followsteps10–18underMotor Replacement.
Field Wiring
All wiring connections and wiring sizes must meet
National Electrical Code and local requirements.
Motor Protection
See the motor nameplate for electrical connection/wiring
diagram.
Berkeley pumps must be used with the proper size and
type of motor starter to ensure protection against damage
from low voltage, phase failure, current imbalances, and
overloads. The overload should be sized to trip at the
full-load current rating of the motor.
O.K.
3347 1198
O.K.
Figure 3 - Install Pipe Correctly to Prevent Air Locks
3346 1198
Vacuum Valve
Figure 4 - Loop and Vacuum Valve Installation

5
OPERATION
Priming
Risk of explosion and scalding. Do not run
the pump with the discharge valve closed; the water in
the pump may boil, causing risk of explosion and steam
burns to anyone nearby.
Risk of electric shock. Can shock, burn
or kill. Disconnect all power to the pump before
servicing or working on the pump. Make sure that
the power is locked out and that the pump cannot be
accidentallystarted.
Operation of closed systems or open systems with the
liquid level above the pump priming plug:
1. Close the discharge isolating valve and loosen the
needle valve located in the assembly in the pump
head(Figure5).Donotremovetheneedlevalve.
Risk of flooding. Can cause personal injury
and/or property damage. Watch the direction of the
priming plug and make sure that the liquid escaping
from it does not injure persons nearby or damage the
motor or other components. In hot water installations,
pay particular attention to the risk of injury from scalding
hot water.
2. Slowly open the isolation valve in the suction pipe
until a steady stream of liquid runs out the vent in
the priming port.
3. Tighten needle valve to 25 inch-pounds. Completely
open isolation valves.
NOTICE: Please turn to Starting before proceeding
anyfurther.
Operation of open systems with the liquid level below
the top of the pump:
NOTICE: The suction pipe requires a check valve or
isolation valve.
1. Close the discharge isolation valve.
2. Remove the vented priming plug.
3. Pour liquid through the priming port until the suction
pipe and the pump are completely filled with liquid.
4. Replace the vented priming plug and tighten
itsecurely.
5. Repeat steps 1-4 until the pump is primed.
NOTICE: Please turn to Starting before proceeding
anyfurther.
Checking Direction of Rotation
NOTICE: Do not disconnect the motor from the shaft
to check the direction of rotation. If you remove the
coupling, then you must adjust the shaft position
when you reinstall it. This must be done before starting
thepump.
Arrows on the pump head show the correct direction
of rotation. When seen from the motor fan, the pump
should rotate counterclockwise ( ).Forpumpmotors
without a fan remove one of the coupling guards and
look at the coupling to determine the direction of
rotation. Turn off the pump and replace coupling guard.
NOTICE: Do not check the direction of rotation until the
pump has been filled with liquid. See “Priming”, at left
and above.
1. Switch power off.
2. Remove the coupling guard and rotate the pump
shaft to be certain it can turn freely. Replace the
coupling guard.
3. Verify that the electrical connections are in
accordance with the wiring diagram on the motor.
4. If the fan is visible, turn on and off to verify rotation.
5. Toreversethedirectionofrotation,firstswitchOFF
the power supply.
6. On three-phase motors, switch 2 of the 3 power
leads on the load side of the starter. On single-phase
motors, see the connection diagram on the motor
nameplate. Change the wiring as indicated.
Risk of electric shock. Can shock, burn or
kill. Ground the pump motor correctly before connecting
topowersupplyperarticle250-80ofNationalElectrical
Code (NEC) in the U.S., or the Canadian Electrical Code
(CEC), as applicable.
7. Switch on the power supply and recheck the
direction of motor rotation.
3348 1198
Vented
Priming
Plug
Drain
Plug
Back off needle valve
to vent air. Retighten
to 25 in.-lbs. when vent
port runs a steady stream
of water.
Figure 5 - Priming and Drain Plugs

6
Starting
1. If a suction line isolation valve has been installed,
check to be sure that it is completely opened.
2. Forinitialstarting,theisolationvalveinthedischarge
pipe should be almost closed.
3. Start the pump.
4. When the piping system has been filled with liquid,
slowly open the discharge isolation valve until it is
completely open. Opening the valve too fast may
result in water hammer in the discharge pipe. If the
pump or system start to rattle, the pump is cavitating;
to avoid damage to the pump, reduce the flow
through the discharge isolation valve until the rattling
stops. If this does not give adequate flow for your
installation, call your installer or system designer.
5. Record the voltage and amperage of the motor.
Adjust the motor overloads if required.
6. If pressure gauges have been installed, check and
record operating pressures.
7. Check all controls for proper operation.
Motor Bearings
Forthegreasingscheduleandgreasingprocedureof
the motor bearings follow the motor manufacturers
recommendations.
MAINTENANCE
Motor Replacement
Thereferencenumbers[shownas(11)or(88)]referto
theexplodedviews,Figures10-13.Seetheappropriate
exploded view for your model series.
Risk of electric shock. Can shock, burn or
kill. Disconnect all power to the pump before servicing
or working on pump. Make sure that power is locked out
and that pump cannot be accidentally started.
1. Disconnect the power to the pump motor.
2. Close the nearest suction and discharge valves.
3. Remove the coupling guards (54).
4. Remove the socket head screws (73) and the
couplinghalves(44)fromtheshaft(81).See
Figure6.
NOTICE: Socket head screws are metric. See Table III
for specific metric driver sizes.
5. If your pump has a shaft pin (72), remove it.
6. Remove the motor bolts (74/92) and flatwashers that
hold the motor and the motor stool (36/53) together.
7. Pull the old motor up and off of the motor bracket.
NOTICE: Make a note of the orientation of the
conduit box on the motor.
8. Thoroughlycleanthesurfacesofthemounting
flanges on the new motor and the pump end.
9. Install the new motor on the pump with the conduit
box in the desired position.
10. Lubricate the motor bolts (74/92) with oil.
11. Reinstall the flatwashers and motor bolts (74/92) that
hold the motor and the motor stool (36/53) together,
then tighten the bolts evenly and diagonally. See
Table III for torque specifications.
12. BVM(I/X)1-BVM(I/X)20: Reinstall the shaft pin (72)
if your pump has one. Raise the height of the pump
shaft by using the shaft pin (72) as a lift point (you
may have to a put a block under the pin and lift with
a flat screwdriver). Insert the stack height adjustment
tool(seeFigure7)inbelowtheshaftcollarandlet
the shaft collar rest on it. BVM(I/X)33: Pick up the
shaft (if necessary, temporarily reinstall the coupling
to provide a grip to lift by) and insert the stack height
adjustmenttool(seeFigure7)belowtheshaftcollar.
Let the shaft collar rest on it.
3358 1111
Figure 6 - Remove the Socket Head Screws and the
Coupling Halves
Pump
3359 0511
Insert
Stack
Height
Gauge
Under
Shaft
Collar
Coupling
Motor
Shaft Collar
Figure 7 - Using the stack height adjusting tool

7
13. Reinstall the coupling (43) on the pump and motor
shaft. If the pump has a shaft pin, the pin axially
locates the pump shaft. If the pump does not have a
shaft pin, then set the coupling so that it grips equal
lengths of the pump and motor shaft.
14. Tighten the coupling’s socket head cap screws (73).
NOTICE: Torque settings are critical to prevent
coupling movement. If the coupling is not tightened
to the correct torque, it could slip on the shaft and
overheat and damage both the coupling and the
shaft. Refer to Table III, for torque specifications. Be
sure to tighten the two halves of the coupling evenly
(seeFigure8).
15. Remove the stack height adjustment tool and clip it
to one of the coupling guards.
16. Rotate the shaft to make sure that there is no
interference. After assembly there should be a small
gap between the shaft collar and the bracket. If
anything rubs, repeat steps 13, 14, and 15 to readjust
pump shaft height.
17. Reinstall the coupling guards.
NOTICE: The guards should be in place before the
unit is run.
18. Openthesuctionanddischargevalves.Turnthe
power back on.
Replacing Mechanical Seal
1. FollowSteps1-7underMotorReplacementandthen
proceed with Step 2 below.
2. Loosen the three set screws in the shaft collar above
the mechanical seal and remove the shaft collar.
3. Remove the four retaining bolts (69) that hold down
the seal flange and seal.
4. Use a flat screwdriver to pry up the seal flange.
Remove the top portion of the seal.
5. Using the three round holes on the top of the shaft
sleeve,ornotchinflange(seeFigure9),removethe
remaining portions of the seal.
6. Clean the seal seat area with a wetted cloth.
NOTICE: Be sure that you do not scratch, chip, or
scar the seal face. Be sure that the seal face is clean
before finishing assembly.
7. Wipe a small amount of water onto the O-Ring on
the inside of the new seal.
8. Slidethenewsealassemblyontotheshaftasasingle
unit.
9. Install the four retaining bolts in the seal flange and
tighten them to 3.0 foot-lbs. (4.0 Nm).
10. FollowSteps8through19underMotorReplacement
to reinstall the motor.
Replacing Pump Stack
Thereferencenumbers[shownas(11)or(88)]refer
totheexplodedviews,Figures10-13.Seethe
appropriate exploded view for your model series.
1. Followsteps1-7underMotorReplacement,then
proceed with step 2 below.
2. Remove the motor bracket adapter plate (50), if your
pump has one.
3. Followsteps2-5underMechanicalSeal
Replacement and then proceed with Step 3 below.
4. Removethestayboltnuts(77)andflatwashers(78)
fromthestaybolts(81).Usevicegrips,ifnecessary,
to prevent the staybolts from unscrewing out of the
pump base.
NOTICE: It is not necessary to remove the staybolts
when replacing the stack.
5. With the base firmly attached to a solid floor,
pull the motor stool (36) or motor stool/pump
head assembly (36/53 or 36/56) straight up off the
staybolts.
6. Make a note of the orientation of any tabs in the
top of the stack assembly, then remove the stack
assembly by pulling it straight up.
7. Install the new stack assembly, making sure that the
orientation of the tabs matches the orientation of the
tabs on the old stack assembly.
8. ReplacethestacksleeveO-Ring(82)locatedinthe
motor stool (36/53) or pump head (36/56). Make sure
that the new O-Ring is evenly seated in the O-Ring
groove in the motor stool or pump head.
9. Apply water to the stack sleeve O-Ring in the motor
stool/pumphead(82)andtothetopofthestack
sleeve(48).
3361 1298
Figure 8 - Make Sure that the coupling halves are evenly
tightened
Shaft Sleeve
Shaft
Notch
Flange
Pump
Head
Figure 9

8
10. BVM1–BVM20: Slide the motor stool (36) over the
staybolts(81)andontothesleeve(48).Slidethe
pump head (36) over the staybolts onto the stack
sleeve(48).BesurethestacksleeveO-Ringseatsin
the pump head. Add the staybolt nuts and washers
(77,78)andtightenthemtotorquespecifications
listed in Table III.
BVM(I/X)1-20: Mount the pump head (56) on the
stacksleeve(48).BesurethestacksleeveO-Ring
(82)seatsinthegrooveinthepumphead.Follow
it with the motor stool (36) which goes over the
staybolts(81)andseatsonthepumphead.Slidethe
pump head (36) over the staybolts onto the stack
sleeve(48).BesurethestacksleeveO-Ringseatsin
the pump head. Add the staybolt nuts and washers
(77,78)andtightenthemtotorquespecifications
listed in Table III.
BVM/BVM(I/X)33-90: Slide the pump head (36) over
thestayboltsontothestacksleeve(48).Besurethe
stack sleeve O-Ring seats in the pump head. Add the
stayboltnutsandwashers(77,78)andtightenthem
to torque specifications listed in Table III. Place the
motor stool (53) on the pump head and fasten it with
four pump head bolts (74A). Tighten the pump head
bolts to torque specifications given in Table III.
BVM/BVM(X)120-150: Slide the pump head (36)
overthestayboltsontothestacksleeve(48).Besure
the stack sleeve O-Ring seats in the pump head. Add
thestayboltnutsandwashers(77,78)andtighten
them to torque specifications listed in Table III. Make
sure that the stack can rotate freely. Install the motor
stool (53) on the pump head. NOTICE:Forlarger
horsepower motors, the motor stool slides over the
staybolts and is fastened with a second set of staybolt
nutsandwashers(77,78),whichmustbetorqued
to the specification given in Table III. All 120-150
models: Install the pump head bolts (74A) through
the base of the motor stool. Tighten them to the
torque specifications given in Table III.
11. Make sure that the stack can rotate freely.
12. FollowSteps6–10underMechanicalSeal
Replacement.
Table III – Torque Specifications (foot-lbs.) For Cast Iron and Stainless Steel Models
Description
Type of
Fastener Item No. Size Torque (Nm) Torque (ft-lbs) Flow Series
Shaft Collar
Set Screw Set Screw none M5 2.5 1.8 All
Mech Seal
Holder Screws
Socket Head
Cap Screw 69 M6 4.0 3.0 All
Couplings
Bolts
Socket Head
Cap Screw 73
M6 13.0 9.6 Varies
M8 31.0 22.9 Varies
M10 62.0 45.7 Varies
Pipe Plug Hex Head 76 M16 35.0 25.8 All
Exhaust Screw Hex Head 64 M6 35.0 25.8 All
Drain Plug Hex Head 63 M16 35.0 25.8 All
Motor bolts Hex Head 74
3/8-16x1” 40.7 30.0 Varies
1/2-13 x 1.25” 47.5 35.0 Varies
1/2-13 x 1.50” 47.5 35.0 Varies
1/2-13 x 1.75” 47.5 35.0 Varies
Pump Head/
Stool Bolts
Socket Head
Cap Screw 74 M10 62.0 45.7 BVM10- BVM150
Staybolt Nut Hex nut 77
M12 40.0 29.5 BVM1-BVM5
M16 80.0 59.0 BVM10-
BVM20
M16 110.0 81.1 BVM33
Shaft Locknut Hex nut 40 M8 18.0 13.3 BVM1-BVM20
88 M14 31.0 22.9 BVM33
Strap Bolt Hex nut 70 M8 15.0 11.1 BVM10
Collet Locknut Hex nut 22 M30 100.0 73.8 BVM33

9
13. FollowSteps11–19underMotorReplacementto
reinstall the motor.
Risk of explosion and scalding. Do not run
pump with discharge valve closed; the water in the pump
may boil, causing risk of explosion and steam burns to
anyone nearby.
Frequency of Starts and Stops
Check pump cycling frequency and make sure that
the pump starts per hour do not exceed the motor
manufacturer’s specification.
Frost Protection
1. If you do not use your pump during seasons of
frost, drain it and add a glycol based antifreeze
(50/50mixture) to avoid damage.
Risk of flooding. Can cause personal injury
and/or property damage. Watch the direction of the
priming plug and make sure that liquid escaping from
it does not injure persons nearby or damage the motor
or other components. In hot water installations, pay
particular attention to the risk of injury from scalding
hotwater.
2. Upon restart dispose of spent antifreeze properly.
3. Do not replace the drain plug or tighten the priming
plug until you put the pump back in service again.
Regular Maintenance Checks
The following checks should be made at regular intervals:
1. The pump meets required performance and is
operating smoothly and quietly.
2. There are no leaks.
3. The motor is not overheating.
4. Remove and clean all strainers and filters in the
system.
5. Verifyampdraw–checkmotoramperage.
6. Pump wear rings and shaft require no regular
maintenance.

10
TROUBLESHOOTING
Risk of electrical shock and possible unexpected starts. Disconnect all power to the pump before
servicing or working on pump. Make sure that power is locked out and that pump cannot be accidentally started.
Problem Cause
1. Motor does not run when
started
A. Power failure
B.Fusesblown
C. Motor starter overload has tripped out
D. Main contacts in motor starter are not making contact or the coil is faulty
E. Control circuit fuses are defective
F.Motorisdefective
2. Motor starter overload trips
out immediately when power
supply is switched on
A. One fuse has blown
B. Contacts in motor overload relay are faulty
C. Cable connections are loose or faulty
D. Motor winding is defective
E. Pump mechanically blocked
F.Overloadsettingistoolow
3. Motor starter overload trips
out occasionally
A. Overload setting is too low
B. Low voltage at peak times
4. Motor starter has not tripped
out but the motor does not run A. Check 1 A), B), D,) and E)
5. Pump capacity is not constant
A. Pump inlet pressure is too low
B. Suction pipe/pump partly blocked
C. Pump is sucking air
6. Pump runs but gives no water
A. Suction pipe/pump blocked
B.Footornon-returnvalveisblockedinclosedposition
C. Leakage in suction pipe
D. Air in suction pipe or pump
E. Motor rotates in the wrong direction
7. Pump runs backwards when
switched off
A. Leakage in suction pipe
B.Footornon-returnvalveisdefective
C.Footvalveisblockedinopenorpartlyopenposition
D. Non return valve leaks or is blocked in open or partly open position
E. Discharge valve is defective
8.Leakagefromshaftseal A. Pump shaft position is incorrect
B. Shaft seal is defective
9. Noise
A. Cavitation is occurring in the pump
B. Pump does not rotate freely (That is, there is increased frictional resistance)
because of incorrect shaft position