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