Walchem LK Series User manual

LK Series
Metering Pump
Instruction Manual
Five Boynton Road Hopping Brook Park Holliston, MA 01746 USA
TEL: [phone] FAX: [phone] WEB: www.walchem.com www.iwakiamerica.com

Notice
© 2016 WALCHEM, Iwaki America Inc. (hereinafter ”Walchem”)
Five Boynton Road, Holliston, MA 01746 USA
tel [phone] fax [phone]
All Rights Reserved
Printed in USA
Proprietary Material
The information and descriptions contained herein are the property of WALCHEM. Such
information and descriptions may not be copied or reproduced by any means, or
disseminated or distributed without the express prior written permission of WALCHEM.
This document is for information purposes only and is subject to change without notice.
Statement of Limited Warranty
WALCHEM warrants equipment of its manufacture and bearing its identification to be free
from defects in workmanship and material for a period of one year from date of delivery
from the factory or authorized distributor under normal use and service and otherwise
when such equipment is used in accordance with instructions furnished by WALCHEM and
for the purposes disclosed in writing at the time purchased, if any. WALCHEM’s liability
under this warranty shall be limited to replacement or repair, F.O.B. Holliston, MA U.S.A.
of any defective equipment or part which, having been returned to WALCHEM,
transportation charges prepaid, has been inspected and determined by WALCHEM to be
defective.
THIS WARRANTY IS IN LIEU OF ANY OTHER WARRANTY, EITHER EXPRESS OR
IMPLIED, AS TO DESCRIPTION, QUALITY, MERCHANT-ABILITY, FITNESS FOR ANY
PARTICULAR PURPOSE OR USE, OR ANY OTHER MATTER.
P/N 180173.N
April 2016

TABLE OF CONTENTS
Thank you for choosing a Walchem LK Series Metering Pump. This instruction manual
deals with the correct installation, operation, maintenance and troubleshooting procedures
for the LK metering pumps. Please read through it carefully to ensure the optimum
performance, safety and service of your pump.
IMPORTANT INSTRUCTIONS .................................................................................. 1
1 Operating Principle ........................................................................................... 3
2 Model Identification Guide ............................................................................... 4
3 Specifications and Outer Dimensions ............................................................ 4
4 Names of Parts .................................................................................................. 7
5 Description on Main Unit and Label .............................................................. 15
6 Handling Instructions ..................................................................................... 17
7 Installation ....................................................................................................... 18
8 Piping ............................................................................................................... 19
9 Wiring .............................................................................................................. 21
10 Operating Instructions ................................................................................... 21
11 Troubleshooting .............................................................................................. 24
12 Maintenance and Inspection .......................................................................... 25
13 Spare Parts ...................................................................................................... 27
14 Disassembly and Assembly ........................................................................... 27

1
IMPORTANT INSTRUCTIONS
Important notes and statements about the safe operation and prevention of physical injury and/or
property damage are included throughout this instruction manual.
Always Observe These Safety Instructions!
Safety Instructions to Prevent Personal Injury
In this manual, the following symbols and signs are used to clearly indicate safety instructions:
Warning
Non-observance or misapplication of the contents of the
"Warning" section could lead to a serious accident, including
death or injury.
Caution
Non-observance or misapplication of the contents of the
"Caution" section could lead to serious physical injury to the
user or serious damage to the product.
Warning
(Always read and observe the following instructions to prevent personal injury.)
 Damaged or deteriorated tools are very dangerous. Use only qualified and suitable tools.
 Use protective gear. When disassembling, assembling, and conducting maintenance or when
handling a dangerous type of liquid or a liquid of unknown property, be sure to wear safety gloves, a
helmet, and protective shoes. In addition, when handling wet-end parts, always wear protective
goggles, masks, etc.
 Prevent death or injury from a falling pump. Make sure the rope or chain used for lifting the
pump is not accidentally cut or disconnected during installation. Make sure the rope or the chain
used to lift the pump has sufficient strength for the pump load. Do not to stand underneath a lifted or
suspended pump.
 Always turn off the power supply prior to servicing the pump. Make special provisions so
that the power supply cannot be turned on while someone is working on the pump. In a noisy or
poor visibility environment, display a sign near the power supply switch to notify others that
someone is "WORKING" on the pump. Power mistakenly applied during maintenance may lead to
personal injury.
 Check and make sure that there is no one near the pump when switching on the power
supply. The pump is not equipped with an ON/OFF switch. Connecting the power cable or power
plug supplies the power to the pump and starts the operation.
 Run the pump at the specified power supply voltage on the nameplate only. Fire or electric
shock may result if the supply voltage is incorrect. 
 If pump operation is stopped due to a power failure or closure of discharge line, turn off
the power switch at once. After normal conditions are established, reapply power.

2
 Do not use the pump for anything that it is not designed to do. User’s failure to observe this
instruction exempts Walchem from any responsibility for personal injury or damage to the
equipment or facility caused by the pump’s misuse.
 When handling liquid with toxic or strong vapors, ventilate the working area well. In addition,
the operator must wear protective gear (such as a safety mask, safety goggles, and protective gloves).
 Do not allow toxic substances such as lubricants, solvents, or similar substances to flow
into the local sewage system or river systems. Do not drain hazardous liquids such as chemical
solutions discharged out of the pump directly onto the ground. Instead, drain such liquids into an
appropriate container. Observe the laws and regulations related to the application, handling, and
processing of hazardous substances.
Caution
(Always read and observe the following instructions to prevent personal injury.)
 Wear gloves when working with rope or chain. Working with bare hands may result in
serious injury, since fingers are likely to be caught between the pump and the rope or chain
when the rope or chain is under tension.
 The pump is not designed to be used under water. Install the pump in a clean, dry
environment where the pump cannot become submerged. It is recommended that the pump
be shielded from direct exposure to the elements.
 Install a safety valve on the discharge line. Installation of a pressure relief valve is highly
recommended. Check local codes and regulations.
 Do not close off the discharge or suction lines while the pump is operating. The pump or
piping may become damaged.

3
1 Operating Principle
The rotation of the motor is reduced by means of the worm and wheel. The rotary motion is
converted to a reciprocating motion by the spring-back mechanism (including the worm wheel
shaft, slider, spring, etc.). The reciprocating motion is transmitted to the diaphragm directly
connected with the shaft, changing the volume inside the pump chamber. The variation in volume
inside the pump chamber and the functioning of the valves in the pump head produce the pump
operation. To adjust stroke length, the adjusting dial fixed on the control shaft is rotated to change
the return of the slider.
DIAPHRAGM
SHAFT
SPRING CONTROL
SHAFT
DIAL
SLIDER
WORM WHEEL
SHAFT
MOTOR

4
2 Model Identification Guide
LK N 32 A – VC
1 2 3 4 5
1 LK Series motor-driven metering pump
2 N – NEMA 42C motor mounting flange
3 Capacity/Pressure Rating. Refer to specifications and outer dimensions below.
4 Motor Code:
 A = 115/230V, 60Hz, 1 ph, 1/3 HP, 1725 RPM, TEFC Frame 42C
 B = 230/460V, 60Hz, 3 ph, 1/3 HP, 1725 RPM, TEFC Frame 42C
 C = 190/380V//230/460V, 50/60Hz, 3 ph, 1/3 HP, 1450/1725 RPM, TEFC, Frame 42C
 D = 90VDC, 1 ph, 1/3 HP, 1750 RPM, TENV, Frame 42C Variable Speed Motor, 115V Control
 E = 180VDC, 1 ph, 1/3 HP, 1750 RPM, TENV, Frame 42C Variable Speed Motor, 230V Control
 F = 230/460V, 60Hz, 3 ph, 1/3 HP, 1725 RPM, Explosion Proof Motor: Class 1, Div 1, Group C & D
 G = 230/460, 60 Hz, 3 ph, 1/3 HP, 1725 RPM, Inverter Duty Motor, TENV, 42C
5 Liquid End Code. Refer to the table below.
Material symbol
VC
VH
VS
TC
S6
Part
Pump head
PVC
PVC
PVC
PVDF
316 SS
Valve ball
CE
HC
HC/304 SS
CE
HC
Valve seat
Type 32
FKM
EPDM
304 SS
FKM
316 SS
Type 45 to 57
PVC
PVC
304 SS
PVDF
316 SS
O ring
FKM
EPDM
EPDM
FKM
-
Valve gasket
PTFE
Diaphragm
PTFE + EPDM
CE: Alumina ceramic HC: Hastelloy C267
3 Specifications and Outer Dimensions
Model
Capacity
Maximum Pressure
PSI (MPa)
Stroke speed
(spm)
Connection
NPT
Viscosity
cps
50Hz
(l/h)
60Hz
(GPH)
PVC/PVDF
SS
50Hz
60Hz
PVC/PVDF
SS
LKN32
30
9.5
150 (1)
225 (1.5)
96
116
½”
½”
VC: 300
TC: 300
VH: 500
VS: 1000
S6: 1000
LKN45
50
15.9
150 (1)
225 (1.5)
48
58
½”
½”
LKN47
100
31.8
120 (0.8)
120 (0.8)
96
116
½” *
½”
LKN55
168
53.4
75 (0.5)
75 (0.5)
48
58
1”
1”
LKN57
360
114.3
45 (0.3)
45 (0.3)
96
116
1”
1”
* LKN47-VS has 1” NPT connections

5
Outer dimensions
 LKN32, 45, 47, 55, 57, VC, VH, VS
Dimensions in inches (mm)
Model
L
A
C
E
F
J
K
LKN32, VC, VH, VS
10.91
(277)
12.05
(306)
3.82
(97)
4.06
(103)
4.61
(117)
½” NPT
4 x ø0.35”
(ø9)
LKN45, 47, VC, VH, VS
11.06
(281)
12.01
(305)
3.90
(99)
4.06
(103)
4.69
(119)
LKN47VS
11.06
(281)
10.83
(275)
3.90
(99)
3.46
(88)
4.69
(119)
1” NPT
LKN55, 57, VC, VH, VS
11.77
(299)
12.48
(317)
4.53
(115)
4.17
(106)
5.31
(135)
F
3.35”
(85mm)
0.79”
(20mm)
4.92”
(125mm)
c
L
6.50"
(165mm)
E
K
3.94"
(100mm)
4.72"
(120mm)
j
2.00"
(51mm)
A

6
Outer Dimensions
 LKN32, 45, 47, 55, 57, S6
Dimensions in inches (mm)
Model
L
A
C
E
F
J
K
LKN32, S6
10.91
(277)
7.80
(198)
3.82
(97)
1.93
(49)
4.61
(117)
½” NPT
4 x ø0.35”
(ø9)
LKN45, 47, S6
11.14
(283)
11.69
(297)
3.98
(101)
3.86
(98)
4.76
(121)
LKN55, 57, S6
11.61
(295)
14.53
(369)
4.37
(111)
5.31
(135)
5.16
(131)
1” NPT
F
3.35"
(85mm)
4.92"
(125mm)
L
A
6.50"
(165mm)
E
K
j
3.94"
(100mm)
4.72"
(120mm)
2.00"
(51mm)
0.79"
(20mm)
F

7
Outer Dimensions
 LKN32, 45, 47, 55, 57, TC
Dimensions in inches (mm)
4.72"
(120mm)
3.94"
(100mm)
E
6.50"
(165mm)
F
c
3.35"
(85mm)
4.92"
(125mm)
L
0.79"
(20mm)
A2.00"
(51mm)
Model
L
A
C
E
F
J
K
LKN32, TC
10.91
(277)
12.05
(306)
3.82
(97)
4.06
(103)
4.61
(117)
½” NPT
4 x ø0.35”
(ø9)
LKN45, 47, TC
11.06
(281)
12.95
(329)
3.90
(99)
4.89
(114)
4.69
(119)
LKN55, 57, TC
11.77
(299)
12.48
(317)
4.53
(115)
4.17
(106)
5.31
(135)
1” NPT

8
4 Exploded View and Parts List
 LKN32 VC, VH, VS
No.
Part
Qty
VC
VH
VS
Part No.
Material
Part No.
Material
Part No.
Material
1
Pump head
1
L0770
PVC
L0770
PVC
L1227
PVC
*2
Ball
2
L0063
Alumina
Ceramic
L0062
Hastelloy
C
L0062
Hastelloy
C
*3
Valve guide
2
L0064
PVC
L0064
PVC
L0488
PVC
*4
Valve seat
2
L0066
FKM
L0065
EPDM
L0489
SS304
*5
Valve Gasket
2
L0068
PTFE
L0068
PTFE
L0068
PTFE
6
Adapter
2
L0072
PVC
L0072
PVC
L0072
PVC
*7
O-ring
2
L0074
FKM
L0073
EPDM
L0073
EPDM
*8
O-ring
2
L0016
FKM
L0015
EPDM
L0015
EPDM
 L0506 (PVC) is used on the suction side.
No.
Part
Qty
Part No.
Material
20
Hex head bolt
6
L0246
SS
21
Split washer
6
EH2012
SS
22
Plate washer
6
EH2011
SS
29
Reinforcing plate
1
L0771
Steel
*30
Diaphragm
1
L0080
PTFE + EPDM
*31
Retainer
1
L0081
SS304
50
Nut
2
L0022
PVC
51
Fitting
2
L1590
PVC
* Parts included in the spare parts kit.

9
 LKN45, 47 VC, VH, VS
No.
Part
Qty
VC
VH
VS
Part No.
Material
Part No.
Material
Part No.
Material
1
Pump head
1
L1500
PVC
L1500
PVC
L1500
PVC
*2
Ball
2
L0093
Alumina
Ceramic
L0092
Hastelloy C
L0092
Hastelloy C
*3
Valve guide
2
L0094
PVC
L0094
PVC
L0094
PVC
*4
Valve seat
2
L0095
PVC
L0095
PVC
L0096
SS304
*5
Valve Gasket
2
L0097
PTFE
L0097
PTFE
L0097
PTFE
*7
O-ring
2
L0103
FKM
L0102
EPDM
L0102
EPDM
No.
Part
Qty
Part No.
Material
Notes
20
Hex head bolt
8
L1166
SS
22
Plate washer
8
L1610
SS
29
Reinforcing plate
1
L1224
FC200
*30
Diaphragm
1
L0109
PTFE + EPDM
*31
Retainer
1
L0110
SS304
50
Nut
2
L1596
PVC
51
Fitting, ½” NPT
2
L1593
PVC
For LKN45/47-VC/VH and LKN45-VS
51
Fitting, 1” NPT
2
L1595
PVC
For LKN47-Vs only
* Parts included in the spare parts kit.
22
50
50

10
 LKN55, 57 VC, VH, VS
No.
Part
Qty
VC
VH
VS
Part No.
Material
Part No.
Material
Part No.
Material
1
Pump head
1
L1513
PVC
L1513
PVC
L1513
PVC
*2
Ball
2
L0151
Alumina
Ceramic
L0150
Hastelloy C
L0150
Hastelloy C
*3
Valve guide
2
L0152
PVC
L0152
PVC
L0152
PVC
*4
Valve seat
2
L0153
PVC
L0153
PVC
L0154
SS304
*5
Valve Gasket
2
L0155
PTFE
L0155
PTFE
L0155
PTFE
*7
O-ring
2
L0161
FKM
L0160
EPDM
L0160
EPDM
No.
Part
Qty
Part No.
Material
20
Hex head bolt
8
L1168
SS
22
Plate washer
8
L1610
SS
29
Reinforcing plate
1
L1600
FC200
*30
Diaphragm
1
L0167
PTFE + EPDM
*31
Retainer
1
L0168
SS304
50
Nut
2
L1596
PVC
51
Fitting
2
L1595
PVC
* Parts included in the spare parts kit.
50
50
22

11
 LKN32 S6
* Parts included in the spare parts kit.
No.
Part
Qty
Part No.
Material
1
Pump head
1
L1204
SS316
*2
Ball
2
L0062
Hastelloy C
*3
Valve guide
2
L1205
SS316
*4
Valve seat
2
L1206
SS316
*5
Valve gasket A
4
L0244
PTFE
*6
Valve gasket B
2
L0245
PTFE
20
Hex head bolt
6
L0246
SS
21
Split washer
6
EH2012
SS
22
Plate washer
6
EH2011
SS
*30
Diaphragm
1
L0080
PTFE + EPDM
*31
Retainer plate
1
L0081
SS304
70
Fitting
2
L1592
SS316

12
 LKN45, 47, 55, 57 S6
* Parts included in the spare parts kit.
No.
Part
Qty
Part No. for
LKN45, 47
Part No. for
LKN55, 57
Material
1
Pump head
1
L1209
L1212
SS316
*2
Ball
2
L0092
L0265
Hastelloy C
*3
Valve guide
2
L0826
L1213
SS316
*4
Valve seat
2
L0827
L1214
SS316
*5
Valve Gasket
6
L0257
L0269
PTFE
20
Bolt w/split washer
8
L1167
L1167
SS
22
Plate washer
8
L1610
L1610
SS
*30
Diaphragm
1
L0109
L0167
PTFE + EPDM
*31
Retainer plate
1
L0110
L0168
SS304
71
Fitting
2
L1594
L1599
SS316
80
Stud bolt
8
L1509
L1518
SS
81
Hex nut
8
L0762
L1523
SS
82
Split washer
8
L1512
L0189
SS
71
71
22

13
 LKN32 TC
* Parts included in the spare parts kit.
No.
Part
Qty
Part No.
Material
1
Pump head
1
L1226
PVDF
*2
Ball
2
L0063
Ceramic
*3
Valve guide
2
L0332
PVDF
*4
Valve seat
2
L0066
PVDF
*5
Valve Gasket
2
L0068
PTFE
*6
Adapter
2
L0335
PVDF
*7
O-ring
2
L0074
FKM
*8
O-ring
2
L0016
FKM
20
Bolt
6
L0246
SS
21
Split washer
6
EH2012
SS
22
Plate washer
6
EH2011
SS
29
Reinforcing plate
1
L0771
SS41
*30
Diaphragm
1
L0080
PTFE + EPDM
*31
Retainer plate
1
L0081
SS304
50
Nut
2
L1611
PVDF
51
Fitting
2
L1591
PVDF

14
 LKN45, 47 TC
* Parts included in the spare parts kit.
No.
Part
Qty
Part No.
Material
1
Pump head
1
L1505
PVDF
*2
Ball
2
L0093
Ceramic
*3
Valve guide
2
L0347
PVDF
*4
Valve seat
2
L0348
PVDF
*5
Valve Gasket
2
L0097
PTFE
6
Adapter
2
L0350
PVDF
*7
O-ring
2
L0103
FKM
*8
O-ring
2
L0016
FKM
9
Nut
2
L1539
PVDF
20
Bolt w/split washer
8
L1166
SS304
22
Plate washer
8
L1610
SS
29
Reinforcing plate
1
L1224
SS41
*30
Diaphragm
1
L0109
PTFE + EPDM
*31
Retainer plate
1
L0110
SS304
50
Nut
2
L1611
PVDF
51
Fitting
2
L1591
PVDF

15
 LKN55, 57 TC
* Parts included in the spare parts kit.
No.
Part
Qty
Part No.
Material
1
Pump head
1
L1521
PVDF
*2
Ball
2
L0151
Ceramic
*3
Valve guide
2
L0363
PVDF
*4
Valve seat
2
L0364
PVDF
*5
Valve Gasket
2
L0155
PTFE
*7
O-ring
2
L0161
FKM
20
Bolt w/split washer
8
L1168
SS304
22
Plate washer
8
L1610
SS
29
Reinforcing plate
1
L1600
FC200
*30
Diaphragm
1
L0167
PTFE + EPDM
*31
Retainer plate
1
L0168
SS304
50
Nut
2
L1598
PVDF
51
Fitting
2
L1597
PVDF

16
5 Description on Main Unit and Label
Caution: Do not use any solvent when wiping the nameplate, labels or the pump
main unit.
Discharge
Port
Pump
unit
(Liquid end)
Suction Port
Specification Nameplate
Model number and
specifications are indicated
on the nameplate. Operate
the pump within the limits of
the specifications.
Stroke Length
Knob/Indicator
The stroke length can be
adjusted through a range
of 100% to 0% by rotating
the dial.
Motor
Reducing
mechanism

17
6 Handling Instructions
Warning
Do not operate the pump with dangerous or hazardous mediums (such as explosive, combustible,
flammable, or toxic substances).
Caution
Read the following information prior to installation of the pump:
Protective gear:
When operating the pump or working near it, always wear protective clothing, face guard, goggles,
and gloves. Further precautionary measures must be taken depending upon the type of liquid used.
Pump repair:
Do not try to disassemble or repair the pump beyond the range specified in this instruction manual
Contact the local distributor for further help.
1. Handle the pump carefully.
Impacts caused by dropping the pump on the floor or striking it may result in damage or faulty
performance.
2. Do not operate the pump under the following condition:
 where the temperature falls below 0°C
 where corrosive gas or explosive gas may be present
 exposed to splashing water
 where the ambient temperature is 40°C or above
 where the humidity is excessively high (Permissible humidity: 35~85%RH)
 places filled with or likely to be filled with explosive or corrosive atmosphere
 danger due to dust, fire, earthquake and/or any externally imposed shock
3. Keep the pump away from fire.
To prevent fire and explosions, do not place dangerous or flammable substances near the pump.
4. Damaged pump or motor
Do not operate a damaged pump due to the possibility of electric shock.
5. Pump modification
Never attempt to modify the pump. This may cause a serious accident or damage.
6. No disassembly or repair
Users should not disassemble and repair the pump beyond the level given in the "Disassembly
and Assembly" section of this manual.
Caution
The pump must be repaired by trained and qualified operators only. If in need of repair,
stop operation and contact your supplier for service.