Kitz BJ User manual

Document No. : KE-2025-01
Operation Manual
For
BJ Type Butterfly Valves
【Wafer Type】
We appreciate your purchasing our products.
Read all the contents of this manual before piping and using them.
Also keep this manual in a place accessible to the operator.

Document No.: KE-2025-01
This manual applies to the KITZ BJ type butterfly valves （Wafer Type）.
For automated operation, refer to the operation manual prepared by the manufacture of the relevant
valve actuators.
SAFETY CAUTIONS
For the safe use of the product, read all of the safety precautions in this manual before handling the
product.
The safety precautions in this manual are determined to ensure safe and proper use of the product
and to prevent personal injury and property damage. This manual uses two terms, “Warning”and
“Caution”, according to the hazard level, to clearly indicate the extent and severity of the risk.
Both “Warning”and “Caution”indicate important safety instructions. Please be sure to follow them.
Indicates an imminently hazardous situation that, if not avoided, may
result in serious injury or death.
Indicates a potentially hazardous situation that, if not avoided, may
result in minor or moderate injury and product damage.
Indicates a “prohibited” action that must not be carried out.
Indicates a “mandatory” action that must be carried out.
NOTES TO USERS
This manual is designed to show an appropriate usage of the products for transportation, storage,
installation, operation and maintenance. Be sure to read through this manual before handling the
products.
This manual does not cover the whole scope of conceivable usage of the products for
transportation, storage, installation, operation and maintenance. If technical assistance beyond the
scope of this manual is required, contact KITZ Corporation or its distributors.
The specifications have been determined with safety consideration. Do not use products beyond
the specifications.
The illustrations given in this manual do not show all the details. If more detailed information is
required, refer to our relevant valve assembly drawings.
*Any information provided in this operation manual is subject to change without prior notice.

Document No.: KE-2025-01
Contents
Ⅰ. Construction and Design Features············································ 1
Ⅱ. Valve Operating Device ·································································6
Ⅲ. Transportation and Storage ························································· 9
Ⅳ. Valve Installation ·············································································· 12
Ⅴ. Valve Operation ················································································ 16
Ⅵ. Periodic Inspection ·········································································· 20
Ⅶ. Disassembly and Reassembly······················································ 24

Document No.: KE-2025-01 1/38
I. Construction and Design Features

Document No.: KE-2025-01 2/38
I. Construction and Design Features
1. Construction and Function
1.1 Construction and parts names are as indicated in the figure below.
1.2 Rotation of the stem by 90 degrees opens and closes the valve.
1.3 Designed for use in fully open, fully closed, or intermediate position for flow control.
1.4 A center drive mechanism is adopted.
1.5 Bi-directional flow is available.
Stem
Seat rubber
Disc
Stand
Bottom Stem
Valve Body

Document No.: KE-2025-01 3/38
I. Construction and Design Features
2. General Features
2.1 Selectable neck design
Neck design can be selected from a long neck type or a short neck type.
2.2 Interchangeability with JIS products
BJ type butterfly valves (wafer type) comply with JIS B 2032.and interchangeable with the existing
JIS standard butterfly valves. And gear operator type valves (nominal size 50A to 300A) satisfy the
public building construction standard specifications.
2.3 Improved operability
Alignment is easily achieved due to the light aluminum alloy die-casting body.
2.4 Applicable to various fluids
Stainless steel (SCS14A) disc and EPDM seat, which are applicable to various fluids, are used as
standard items.（Except that EPDM seats cannot be used for oil.）
2.5 Stable operating torque
Use of bearings prevents stem galling and provides stable operating torque.
2.6 Easy mounting of actuator
Actuator mounting flanges comply with ISO 5211and direct actuator mounting is available.
2.7 Condensation prevention
Condensation is less likely to occur even on the cold water pipe because a condensation
preventive system is provided to the long neck type (Applicable to a gear operator type).

Document No.: KE-2025-01 4/38
I. Construction and Design Features
3. Valve Specifications and Pressure-Temperature Rating
3.1 Valve specifications
3.1.1 Maximum allowable pressure 1.0 MPa
3.1.2 Service temperature range(Do not freeze the fluid) EPDM：from -20C to +120C
FKM：+5～+90℃
Chlorine resistant EPDM：0～+35℃
(See PT chart for more details)
3.1.3 Fluid temperature range for continuous operation (EPDM) from -20C to +100C
3.1.4 Face to face dimension JIS B 2002 (2032) (46 series)
3.2 Pressure-Temperature rating. (P-T Rating)
When chlorine resistant EPDM (Japan Water Works Association certified product (E-292)) is
used, please apply it to water supply service.
Products certified by the Japan Water Works Association are provided as special order item.
0
0.2
0.4
0.6
0.8
1
1.2
-40 -20 0 20 40 60 80 100 120 140
Working Pressure(MPa)
Temperature(℃)
EPDM(Lower limit)
FKM (lower limit)
Chlorine resistant
EPDM (Upper limit)
FKM(Upper limit)
EPDM(Upper limit)
5
35
90
0.7
Chlorine resistant
EPDM(Lower limit)

Document No.: KE-2025-01 5/38
I. Construction and Design Features
4. Size and Number of Mounting Bolt and Nut
JIS 10K
Valve Size
Number of bolts
Nominal Size
Length (L)
(mm)
DN
NPS
40
11/2
4
M16
85
50
2
4
M16
95
65
21/2
4
M16
105
80
3
8
M16
105
100
4
8
M16
110
125
5
8
M20
120
150
6
8
M20
125
200
8
12
M20
130
250
10
16
M22
150
300
12
16
M22
160
5. Minimum Inside Diameter of Applicable Pipe
Never apply the pipes which have inside diameters smaller than those shown in the table below,
otherwise it will cause unwanted contact with the valve disc and malfunctions.
Valve Size
Pipe Inside Diameter
(mm)
DN
NPS
40
11/2
28
50
2
30
65
21/2
50
80
3
70
100
4
90
125
5
116
150
6
144
200
8
194
250
10
244
300
12
292
Hexagon bolt and nut (L=mm)

Document No.: KE-2025-01 6/38
Ⅱ. Valve Operating Device

Document No.: KE-2025-01 7/38
Ⅱ. Valve Operating Device
Lever Operator Type
1. A lever operator is directly mounted on the valve.
2. Turning the lever handle by 90clockwise will close the valve, and turning the lever handle by 90
counterclockwise will open the valve.
Open
Close
Fluid Flow Direction
Fluid Flow Direction

Document No.: KE-2025-01 8/38
Ⅱ. Valve Operating Device
Gear Operator Type
1. A gear operator is mounted on the valve.
2. According to the letter or arrow on the hand wheel, turning the handwheel clockwise will close the
valve, and turning the handwheel counterclockwise will open the valve.
3. Handwheel operating torque varies with the valve sizes and opening positions.
4. Gear operator is a device to transmit a large torque to the valve stem by converting the torque
from the drive shaft by means of the reduction gears.
Open
Close

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Ⅲ. Transportation and Storage

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Ⅲ. Transportation and Storage
1. Transportation
1.1 Precautions
Keep off the valve lifting area to prevent personal injury caused by unsecured
valves when transporting the valve by lifting.
Take care not to damage painted valve surfaces during transportation. All
damaged surfaces shall be properly repaired to prevent corrosion.
Take care when handling and storing carton-packaged products. High humidity
may damage the cartons and products.
Be careful not to apply abnormal force to shaft of manual gear. Deformed shaft
causes gear and/or valve failures.
1.2 Transportation
1.2.1 Keep valves in the original packages during transportation and until just before installation.
1.2.2 Never apply any excessive impact to valves by throwing, dropping, or dragging them.

Document No.: KE-2025-01 11/38
Ⅲ. Transportation and Storage
2. Storage
2.1 Precautions
DO NOT store valves in a corrosive environment. It may cause corrosion in the
threaded portions of valves.
DO NOT apply any heavy load to the valve. Overloading may damage the valve.
DO NOT carelessly pile up valves for storage. Unstable piling may damage the
valves or cause personal injury.
2.2 Storage
2.2.1 Store valves in a dust-free and well ventilated indoor area with low humidity, avoiding direct
sunlight.
2.2.2 Place packaged valves on pallets or racks for storage. Storing valves directly on the ground or
concrete floor shall be avoided.
2.2.3 Keep the valve open by approximately 10 degrees to prevent the seat rubber from deforming
when the valve is stored for a long period.

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Ⅳ. Valve Installation

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Ⅳ. Valve Installation
1. Precautions for Installation
Check the valve specifications with the catalog and/or the attached name plate.
The valve trim and seat materials determine the service pressure, service fluid
and the range of temperature. Services beyond the valve specifications could
cause leakage or malfunctions.
DO NOT install the valve directly to a check valve or a pump. The valve disc
may be damaged due to unwanted contact with other portions during operation.
Keep a secure footing for valve installation and operation.
Provide adequate lighting for valve installation and operation.
Provide appropriate pipe supports to avoid excessive load on the pipes.
1.1 Allow sufficient space for operation, installation, disassembly and subsequent maintenance of
valves.
1.2 For smooth operation, inspection and maintenance, take appropriate measures for the valves
installed in a small space.
1.3 Valves shall not be installed in a place where valve functions may be hampered by such outer
forces as vibrations.

Document No.: KE-2025-01 14/38
Ⅳ. Valve Installation
2. Precautions for Piping
DO NOT use a flange gasket for piping. It may cause leakage.
DO NOT forcibly install the valve when the distance between the flanges is not
enough. It may cause leakage due to displacement or deformation of the seat rubber.
Install the valve after the flange and pipe weld connections have been completely
cooled down.
Edges of flange welded areas shall be thoroughly chamfered to protect valve seats.
Clean the pipes and remove foreign objects such as dusts, weld spatters or rust from
the flange surfaces before valve installation.
Flange surfaces shall have no damage, deformation or irregularities. Remove foreign
objects from the flange surfaces. (EPDM seat surfaces must be free from grease.)
Align the upstream side pipe and the downstream side pipe accurately. Inaccurate
alignment may cause leakage from flange connections.
Install or dismount the valve with the valve open by approximately 10 degrees before
the fully closed position.
Be careful not to apply abnormal force to shaft of manual gear. Deformed shaft
causes gear and/or valve failures.
Use supports for correct alignment.

Document No.: KE-2025-01 15/38
Ⅳ. Valve Installation
3. Valve Mounting
3.1 Adjust the flange-to-flange distance for valve installation. Use jack bolts if required. Allow some
space between the flanges, 6 mm to 10mm wider than the valve face-to-face dimension.
3.2 Set two bolts to the lower part of the valve. Then, place
the valve between the flanges taking care not to damage
the seat rubber. Set two bolts to the upper part of the
valve. Never use a gasket for installation because the
seat rubber also functions as a gasket.
3.3 Temporarily tighten two sets of the upper bolts and nuts
and the two sets of lower bolts and nuts. Then, adjust the
valve in the correct position.
3.4 Before tightening the bolts, set the valve in the fully open
position and make sure that the disc does not touch the
flanges.
3.5 Attach all of the remaining bolts and nuts.
3.6 Tighten the bolts evenly and alternately to avoid uneven
tightening.
3.7 Securely tighten the bolts until the both flanges firmly
contact with the valve body. (Avoid over-tightening. It
may damage the valve.)

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Ⅴ. Valve Operation

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Ⅴ. Valve Operation
1. Precautions
DO NOT loosen the bolts on the piping section while the service fluid is under
pressure.
DO NOT remove the valve driving section while the service fluid is under pressure.
The stem may blow off.
DO NOT fully close the valve to use the closed valve as a substitute for a blank
flange. When a pressure test (with pressure higher than the rated pressure) is
performed on the pipeline, the valve shall be in the fully open position.
DO NOT carelessly touch the stopper bolt on the gear unit. Displacement of the
closed position may cause seat leakage.
DO NOT apply any excessive operation force to the gear operator when it has
reached the stopper for the fully open or closed position, otherwise the gear
operator may be damaged.
Perform a pressure test (with pressure higher than the rated pressure) with the
valve fully open.
The lever handle or handwheel must be operated by hand. Use of tools such as a
pipe or wrench shall be avoided.
When the valve is used at the slightly open position by 30 degrees or below, contact
KITZ for technical advice.
2. Open-Close Operation
2.1 Lever operator
Clockwise rotation of the lever handle by 90 degrees opens the valve and counterclockwise
rotation closes the valve.
2.2 Gear operator
Clockwise rotation of the handwheel according the arrow opens the valve and counterclockwise
rotation closes the valve.