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ＢＯＲＥ ＳＡＦＥＴＹ
ＳＡＦＥＴＹＳＡＦＥＴＹ
ＳＡＦＥＴＹ ＶＡＬＶＥ
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Instruction Manual
Thank you very much for purchasing our safety valves.
Please read this instruction manual thoroughly before using the safety valve, so that
you may do so correctly and safely. Please carefully store this manual in a handy place.
－－－－－－The following safety symbols are used in this manual.－－－－－
Warnings
Cautions
Contents
Overview･･･････････････････････････････････････････････1
1. Features･････････････････････････････････････････････1
2. Specifications････････････････････････････････････････1
3. Dimensions and weights･･････････････････････････2
4. Structure････････････････････････････････････････････3
5.Operation･････････････････････････････････････4
6.Size selection table .
6.1 For Steam (Pressure vessel structure specifications
・ Boiler structure specifications)･････4
6.2 For Air (Pressure vessel structure specifications )･･････4
7. Installation
7.1 Example of piping･････････････････････････････････5
7.2 Warnings and cautions of product installation････････5～6
8. Maintenance
8.1 Daily inspection･･････････････････････････････････6
8.2 Operational inspection････････････････････････････････7
8.3 Periodic inspection･･･････････････････････････････････ 7
8.4 Troubleshooting ･･････････････････････････････････････7
After sales service
This symbol indicates a potentially hazardous situation that, if not avoided,
could result in death or serious injury.
This symbol indicates a hazardous situation that, if not avoided, may result in
minor or moderate injury. (“Caution” may also be used to indicate other unsafe
p
ractices or risks of property damage.
)
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Overview
Suited for installation on steam boilers, various pressure vessels, instrumentation apparatus, and the
secondary side of pressure reducing valves. Yoshitake’s Safety Relief Valves prevent accidents due to
the abnormal rise in piping pressure.
1. Features
(1) The product is designed according to JIS B 8210 for spring loaded safety relief valves for
steam boilers and gas pressure vessels.
(2) The sealed structure of model AF-7M prevents any external leakage of fluid during operation.
2. Specifications
Model AF-7 AF-7M
Type
Open lever type*
1
Enclosed type*
2
Fluids
Steam, air, and other
non-corrosive gases
Air and other non-corrosive gases
Pressure range 0.1 ~ 1.0 MPa
Temperature range
5 ~ 350 ℃ 5 ~ 300℃
Super imposed back pressure 0 MPa
Connections
Inlet: JIS 10K RF flange or JIS 20K RF flange (JIS B 2238)
Outlet: JIS 10K FF flange (JIS B 2238)
Size (mm) 25, 40, 50, 65, 80, 100
Body Carbon steel casting
Material
Valve & valve seat Stainless steel
*1 A safety valve which is so constructed that a part of the fluid blown off from the valve seat
opening is also discharged outside from other part than the valve outlet.
*2
A safety valve which is so constructed that the fluid blown off from the valve seat opening
is not allowed to discharge outside from other part than the valve outlet.
Warnings
(1) Do not use this product on equipment and apparatus that do not allow any valve seat leakage.
＊This product has valve seat leakage within tolerance, and cannot be sealed completely
(Zero valve seat leakage cannot be obtained).
This product cannot be used for apparatus and facilities with considerable vibration.
＊Vibration may cause the product to make errors.
Cautions
Please confirm that the indications on the product name plate coincide with the specifications of
the ordered product model before usage.
＊ In case they do not coincide, do not use the product and contact us.
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3. Dimensions and Weights
Figure １ Dimensions （Model AF-7）
Connection
flange
＊H
2
(mm)
Size
(mm)
Inlet ×
Outlet
dt
(mm)
Blowout
area (mm
2
)
Rated lift
(mm)
L
(mm)
H
1
(mm)
AF-7 AF-7M
Weight
(kg)
25
25×32
16 200.9 4.0 100 85 226 231 10
40
40×50
25 490.6 6.3 120 110 273 270 20
50
50×65
32 803.8 8.0 135 120 325 321 25
65
65×80
40 1256.0 10.0 160 125 366 361 40
80
80×100
50 1962.5 12.5 170 135 375 370 52
100
100×125
65 3316.6 16.3 205 160 612 580 75
＊ All values for types AF-7 and AF-7M are identical except dimension of H
2
.
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