Walchem LKN Operating Manual

LK Series

Five Boynton Road Hopping Brook Park Holliston, MA 01746 USA

Metering Pump

Instruction Manual

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

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.

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

(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

DIAPHRAGM

SHAFT

SPRING

CONTROL

SHAFT

DIAL

SLIDER

WORM WHEEL

SHAFT

MOTOR

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.

4

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

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”

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.

CE: Alumina ceramic HC: Hastelloy C267

3 Specifications and Outer Dimensions

* LKN47-VS has 1” NPT connections

5

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

Outer dimensions
 LKN32, 45, 47, 55, 57, VC, VH, VS

Dimensions in inches (mm)

6

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

Outer Dimensions
 LKN32, 45, 47, 55, 57, S6

Dimensions in inches (mm)

7

4.72"

(120mm)

3.94"

(100mm)

E

6.50"

(165mm)

F

c

3.35"

(85mm)

4.92"

(125mm)

L

0.79"

(20mm)

A

2.00"

(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

Outer Dimensions

 LKN32, 45, 47, 55, 57, TC

Dimensions in inches (mm)

8

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

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

4 Exploded View and Parts List

 LKN32 VC, VH, VS

 L0506 (PVC) is used on the suction side.

* Parts included in the spare parts kit.