Yoshitake AL-150T Series User manual

■ EPDT-193e ■
MODEL AL-150T series and AL-140T series
SAFETY RELIEF VALVE
PRODUCT MANUAL .
Thank you very much for choosing the Yoshitake’s product. To ensure the correct and safe use of the product,
please read this manual before use. This manual shall be kept with care for future references.
The symbols used in this manual have the following meanings.
Warning
This symbol indicates a potentially hazardous situation that, if not avoided,
could result in death or serious injury.
Caution
This symbol indicates a hazardous situation that, if not avoided, may result in
minor or moderate injury or may result in only property damage.
Table of Contents
1. Usage of the Product··················································1
2. Specifications····························································1
3. Dimensions and Weight···············································2
4. Structure ································································3
5. Operation ·······························································3
6. Nominal Size Selection Table········································4
6.1 For air (at 20˚C) ···················································4
6.2 For water ( at 20˚C, accumulation: 25%) ·····················4
7. Installation································································5
7.1 Piping example····················································6
8. Maintenance·····························································6
8.1 Daily inspection ···················································7
8.2 Regular inspection ···············································7
8.3 Troubleshooting···················································7
8.4 Procedure for set pressure adjustment······················9
Warranty Information

1
■ EPDT-193e ■
1.
Usage of the Product
The AL-150T series and the AL-140T series safety relief valves are used mainly in various pressure vessels,
instrumentation devices and at outlet of pressure reducing valves to prevent accidents caused by abnormal
pressure rise.
2
. Specifications
Model AL-150T AL-140T AL-140TML AL-150TML AL-150TR
Structure
Closed type
Closed type with lever
Closed type
with handle
Application
Air, water, Oil, Other non-dangerous fluids
Water, Oil, Other
non-dangerous
fluids
Working pressure 0.05-1.0 MPa
Working temperature
5-120 ℃ 5-90 ℃
Connection JIS Rc screwed
Nominal size 15-50A
Material
Spring case Cast bronze Cast stainless steel Cast bronze
Valve, valve seat Stainless steel
Spring Stainless steel
O ring
Composition rubber
* Closed lever type AL-150TML and AL-140TML are able to carry out a blowout inspection manually.
* Handle type AL-150TR is available for use in relief valve, which is easy to change the set pressure.
Warning
1. Do not use the product for equipment or device which vibrates excessively.
* Failure to follow this notice may result in malfunction.
2. Do not adjust or change the set pressure.
* Failure to follow this notice may result in damage to the equipment.
Caution
Please confirm that the indications on the product correspond with the specifications
of the ordered product model before use.
* If they are different, do not use the product and contact us.

■ EPDT-193d ■
2
3
. Dimensions and Weight
Nominal
size
Blowout
area
[mm
2
]
Dimensions [mm]
d D L
H
1
AL-150T
AL-150TML
AL-150TR
AL-140T
AL-140TML
15A 20.1 Rc 1/2 16 34 40 40
20A 34.6 Rc 3/4 21 38 43 42
25A 53.0 Rc 1 26 43 51.5 51
32A 93.3 Rc 1 1/4 33 50 61.5 61.5
40A 135.2 Rc 1 1/2 41 60 60 64
50A 208.2 Rc 2 51 75 76 76
Nominal
size
Dimensions [mm] Weight [kg]
H
AL-150T AL-140T AL-150TML
AL-140TML AL-150TR
AL-150T
AL-140T
AL-150TML
AL-140TML AL-150TR
15A 128 128 157 185 0.7 0.8 1.0
20A 128.5 128.5 158 185 0.8 0.9 1.1
25A 144.5 148 174 203 1.1 1.3 1.4
32A 181.5 181.5 212 250 1.8 1.9 2.1
40A 205 205 246 280 2.8 3.0 3.1
50A 245.5 245.5 286 315 4.7 4.9 5.1
AL-150T, AL-140T AL-150TR
AL-150TML, AL-140ML
Fig.1 Dimensions

■ EPDT-193d ■
3
4
. Struct
ure
5
. Oper
ation
Blowout operation
As the inlet pressure approaches the blowout pressure, the force of fluid pushing up the valve [3]
approaches the force of the spring [8] pressing down the valve [3]. The safety relief valve commences to
blow when the inlet pressure gets lower than the blowout pressure.
Then, when the inlet pressure rises and reaches the blowout pressure, the valve [3] pops.
Closing operation
Since the inlet pressure of the safety relief valve decreases when the fluid is released into the atmosphere
by the pop action of valve [3], the force of fluid lift is lowered. At this point, the repelling force of the spring
[8] becomes larger than the force of fluid lift and thus the valve closes. In addition, while the safety relief
valve discharges, pressure of fluid entering into the back of the valve [3] (back pressure) adds to the closing
force.
AL-150T
AL-140T
No. Part name
1 Spring case
2 Valve seat
3 Valve
4 Valve cover
5 O ring
6 C ring
7 Spindle
8 Spring
9 Bottom spring plate
10 Top spring plate
11 Adjusting screw
12 Lock nut
13 Cap
14 Gasket
15 Gasket
16 Name plate
17 Rivet
18 Handle
19 Lever
20 Spring pin
21 Spring pin
22 O ring
23 Connecting rod
24 Pressure groove
Fig.2 Structure
AL
-
150TR
AL
-
150T
ML, AL
-
140TML

■ EPDT-193d ■
4
6
. Nominal Size Selection
Table
6.1 For air (at 20˚C)
Capacity <Pressure vessel structure standard> [kg/h]
Nominal
size
Blowout
area
[mm
2
]
Set pressure [MPa]
0.05 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
15A 20.1 25 33 48 65 81 98 114 131 147 164 181
20A 34.6 44 57 83 111 140 169 197 226 254 283 311
25A 53.0 67 87 127 171 215 258 302 346 390 433 477
32A 93.3 113 147 214 288 362 435 509 582 656 730 803
40A 135.2 169 221 321 431 542 652 762 872 982 1093 1203
50A 208.2 262 341 496 666 836 1006 1176 1346 1516 1687 1857
6.2 For water (at 20˚C, accumulation: 25%)
Capacity <Yoshitake standard> [m
3
/h]
Nominal
size
Blowout
area
[mm
2
]
Set pressure [MPa]
0.05 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
15A 20.1 0.4 0.5 0.9 1.1 1.3 1.5 1.6 1.8 1.9 2.0 2.1
20A 34.6 0.6 0.9 1.6 2.0 2.3 2.6 2.8 3.1 3.3 3.5 3.7
25A 53.0 1.0 1.5 2.5 3.1 3.6 4.0 4.4 4.7 5.1 5.4 5.7
32A 93.3 1.8 2.6 4.5 5.5 6.3 7.1 7.8 8.4 9.0 9.5 10.0
40A 135.2 2.7 3.8 6.5 7.9 9.2 10.3 11.3 12.2 13.0 13.8 14.6
50A 208.2 4.1 5.9 10.0 12.3 14.2 15.9 17.4 18.8 20.1 21.3 22.4
*1: [Example] When the set pressure of 1.0 MPa, and the valve size is 50A
The capacity is 22.4 m
3
/h, when the inlet pressure reaches 1.25 MPa (accumulation becomes
25%) after the fluid pressure reaches the set pressure of 1.0 MPa.

■ EPDT-193d ■
5
7
. Installation
Warning
1. Do not install any closing device such as a stop valve at inlet or outlet sides of the product.
* Failure to follow this notice may result in damage to the pressure vessel because such closing device
may hamper the blowout of the safety relief valve.
2. Install an exhaust pipe on outlet side of the product, and lead it to a place where there is no risk of physical
damage even if fluid blows out.
* Failure to follow this notice may result in injury and scalds in case of fluid blow out.
3. Do not disassemble the product.
* Failure to follow this notice may prevent the product from functioning properly and lead to danger.
4. When installing, tighten the hexagonal part of the valve seat [2] with a spanner.
Do not adjust its direction by rotating the outlet piping.
* Failure to follow this notice may result in scalds or injury due to blow-off caused by screw crack on the
spring case [1] or loosing of the spring case [1] and the valve seat [2].
5. Do not apply viscous fluid that may make fixation of the valve and valve seat.
* Failure to follow this notice may prevent the product from functioning properly.
Caution
1. Before installing the product, remove foreign substances and scale from the piping.
* Failure to follow this notice may prevent the product from functioning properly.
Note that the customer will be required to pay repair charge for any defect that occurs due to foreign
substances.
2. When installing the product, match the direction of fluid flow with the inlet and outlet of the product
respectively.
* Failure to follow this notice may prevent the product from functioning properly.
3. Install the product vertically with the cap [13] facing upward.
* Failure to follow this notice may prevent the product from functioning properly.
4. Securely support and fasten the pipes.
Refer to the following “Pipe mount” and “Exhaust pipe”.
* If an excessive stress is applied to the piping, the product may be deformed and not open/close.
5. Lead exhaust pipe to outside of buildings if there is a risk that fluid blowout causes alarm activation
or contamination of the peripheral equipment.
* Improper placement may cause contamination of the peripheral equipment.
6. Connect the product to the pipes securely.
* Improper connecting may cause fluid leakage from the piping joint when vibration is applied, or may
cause scalds in case that fluid is hot.
7. If there is a risk that condensate or rain water accumulates in exhaust pipe, attach drain pipe with the
product and/or the exhaust pipe in a position where they can be drained.
* Failure to follow this notice may cause rust and result in malfunction.
8. Inner diameters of pipe mount and of exhaust pipe shall be more than those of each inlet and outlet
of the product.
* Failure to follow this notice may result in malfunction or insufficient amount of blowout.
9. Secure enough space required for maintenance or inspections.
* Failure to follow this notice prevents maintenance and inspections being implemented.
10.Avoid rapid pressure change. Impact by a rapid pressure change, such as water hammer, may
damage the product/parts.
11.Do not apply excessive load, torque or vibration to the product.
12.Select a proper model according to usage conditions including operation frequency and durability
required.

■ EPDT-193d ■
6
Cleaning the inside of the piping
1. Please clean the inside of the pipe thoroughly and remove any dust or scales before installing the
product. Please note that all repairs for disorders due to foreign substances shall be charged.
Pipe mount
1. Pipe mount should have sufficient strength and rigidity against stress which are induced by
reaction force in opposite direction of the exhaust through the axis of the exhaust pipe.
2. Pressure loss in pipe mount leads to decrease in the discharge volume and to unstable
operation of the product. To prevent this from happening, install the product vertically as
close as possible to the can body and the header. In addition, place the product in a
position where maintenance and inspection can be done easily.
3. Inner diameter of pipe mount shall be more than that of the product inlet.
Exhaust pipe
1. Install exhaust pipe and drip pan elbow so that the product can not be subject to the
stress caused by thermal expansion of equipment and by dilatation of the exhaust pipe
due to thermal action of blowout.
2. Inner diameter of exhaust pipe shall be more than that of the product outlet to avoid
improper back pressure.
7.1 Piping example
8
. Mai
ntenance
Warning
1. Do not touch the product/pipes or the lever [19] with bare hands.
* Failure to follow this notice may result in scalds or injury in case that fluid is hot.
2. Do not touch the product unless it is necessary.
* Failure to follow this notice may result in scalds or injury in case that fluid is hot.
3. When checking the operation of the product, wear earplugs and stand clear of exhaust pipe end during
inspection. Do not look down or touch the open end of the exhaust pipe.
* Failure to follow this notice may result in scalds or injury due to blow-off. Be aware that the product
makes a loud noise at start-up.
4. Do not remove the cap [13].
* Failure to follow this notice may cause danger due to blow-off from the adjusting screw.
5. Do not disassemble the product.
* Please contact us if any abnormal condition is observed.
Fig.3 Piping example

■ EPDT-193d ■
7
Caution
1. Before applying higher pressure fluid to the product, check that no problems have occurred in the
equipment on the piping.
* Failure to follow this notice may damage the equipment.
2. Completely discharge fluid from the product and piping before leaving the product not operated for a long
time.
* Failure to follow this notice may cause foreign substances and scale inside of the piping and may result
in malfunction of the product.
3. If the product is not operated for a long time, perform test working before starting operation.
8.1 Daily inspection
Check the following items while the system is in operation.
•Leakage from between the cap [13] and the O ring [22]. (AL-140TML, AL-150TML, AL-150TR)
•Corrosion or crack on the product
•Leakage from the product under normal working pressure (check it visually and aurally).
•Leakage from the joint between the product and piping, and between the spring case and the valve
seat.
* Please contact us if any abnormal condition is observed.
8.2 Regular inspection (once per 6 months)
1. Check that there is no loose piping at inlet and outlet side of the product. In addition, check that the
cap [13] is fastened securely.
2. Check the operation of the product by raising fluid pressure to the set pressure.
For the AL-150TML and the AL-140TML (closed type with a lever), check the operation, by lifting up
the lever, while differential pressure between the set and inlet pressures is within the range of table 1.
* Please contact us if any abnormal condition is observed.
Table 1. The differential Pressure in which the blow-off inspection by lever operation is possible
Size Differential pressure between set and inlet pressures
15-25A 1.0 MPa or less
32-40A 0.6 MPa or less
50A 0.4 MPa or less
8.3 Troubleshooting
Trouble
Cause
Remedy
Leakage detected
at the outlet
1.
Foreign substance or scale stuck
on contact surface between the
valve [3] and valve seat [2].
1.
Follow the procedure described in
8
.2.2. to
operate the product and eliminate the foreign
substance and scale.
Please contact us if the trouble does not stop.
2.
Damage on
the O ring [5] or on the
contact surface of valve seat [2].
2.
The product needs to be disassembled
and its parts need to be replaced.
Please contact us.
3.
Excessive vibration applied to the
piping where the product is installed.
3.
The product should not be used on device
or equipment that vibrates excessively.
4.
T
h
e pressure difference between the
set pressure and the normal working
pressure is too small.
4.
The set pressure
needs to be
re
adjusted.
For AL-150TR, readjust the set pressure
by handle (See 8.4). For the other models,
please contact us.
5.
The pressure momentarily exceeds
the set pressure because of fluid
pulsation.
5.
In view of fluid pulsation, the set pressure
needs to be raised (readjusted) or the
normal working pressure needs to be
lowered. To raise (readjust) the set
pressure, please contact us.
6.
Fluid flows into the outlet piping.
6.
Change the piping layout to keep the fluid
from flowing into the outlet piping.
Blows at a pressure
lower than the set
pressure.
1.
The product specifications are not
consistent with the use condition.
1.
Check the set pressure indication on the
name plate. If the product is not suitable
for the usage condition, replace it with a
proper one.
2.
The pressure gauge is out of
order.
2.
Calibrate the pressure gauge or replace it
with a new one.

■ EPDT-193d ■
8
Trouble
Cause
Remedy
Blows at a pressure
lower than the set
pressure.
3.
Damage on
the O ring [5] or on the
contact surface of valve seat [2].
3.
The product needs to be disassembled
and its parts need to be replaced.
Please contact us.
4.
The product does not keep
the
accuracy of its set pressure.
4.
The set pressure needs to be readjusted.
For AL-150TR, readjust the set pressure
by handle (See 8.4). For the other models,
please contact us.
Does not operate
at the set pressure.
1.
The product specifications are not
consistent with the use condition.
1.
Check the set pressure indication on the
name plate. If the product is not suitable
for the usage condition, replace it with a
proper one.
2.
The pressure gauge is out of
order.
2.
Calibrate the pressure gauge or replace it
with a new one.
3.
Sliding parts of the valve [3] and
valve seat [2] do not move smoothly.
3.
The product needs to be disassembled
and cleaned. Please contact us for repair.
4.
There is a back pressure at the piping
of the product outlet.
4.
Remove the
back
pressure. Change the
piping layout not to allow the back
pressure exist.
5.
The product does not keep the
accuracy of its set pressure.
5.
The set pressure needs to be readjusted.
For AL-150TR, readjust the set pressure
by handle (See 8.4). For the other
models, please contact us.
Does not stop blowing.
1.
Foreign substance or scale stuck
on contact surface between the
valve [3] and valve seat [2].
1.
The product needs to be disassembled
and cleaned. Please contact us.
2.
Sliding parts of the valve [3] and
valve seat [2] do not move smoothly.
2.
The product needs to be disassembled
and cleaned. Please contact us.
3.
The normal working pressure
exceeds the closing pressure.
3.
I
ncrease
the difference between the
set pressure and normal working
pressure. If the set pressure needs to
be readjusted, please contact us.
4.
T
h
e product is installed at outlet
side of pressure reducing valve
which is out of order, and the
reduced pressure of the valve is
getting higher than expected.
4.
The pressure reducing valve needs to be
repaired. If it is Yoshitake’s product,
please contact us.
The lever [19] does
not lift up.
<AL-150TML>
<AL-140TML>
1.
The pressure difference between
the set pressure and the inlet
pressure is large.
1.
Make
the
differential pressure between
the set and inlet pressures within the
range of table 1
.
2.
Sliding parts of the valve [3] and
valve seat [2] do not move
smoothly.
2.
The product needs to be disassembled
and cleaned. Please contact us.
Does not stop blowing
after lifting and letting
go the lever [19].
< AL-150 TML >
<AL-140 TML >
1.
Foreign substance or scale stuck
on contact surface between the
valve [3] and valve seat [2].
1.
Lift up the lever again to
eliminate scale.
Please contact us for repair if the trouble
does not stop.
2.
Sliding parts of the valve [3] and
valve seat [2] do not move
smoothly.
2.
The product needs to be disassembled
and cleaned. Please contact us.
Leakage from
between the cap [13]
and the O ring [22].
<AL-150TR>
< AL-150 TML >
<AL-140 TML >
1.
Damage on
the O ring [2
2].
1.
The product needs to be disassembled
and its parts need to be replaced.
Please contact us.

■ EPDT-193d ■
9
8.4 Procedure for set pressure adjustment
DO NOT ADJUST THE SET PRESSURE OF THE MODELS OTHER THAN AL-150TR.
Warning
1. To adjust the set pressure of AL-150TR, turn the handle [18] slowly at the rotation of 1/4-1/3 and confirm
the operation each time. Be careful of the sudden blowout when the handle are turned too much. In case
of blowout, step away from the product immediately.
* Failure to follow this notice may result in injury and scalds due to blowout in case that fluid is hot.
2. Be sure to wear gloves while operating the handle of AL-150TR.
* Failure to follow this notice may result in burn and scalds in case that fluid is hot.
Caution
1. Do not adjust the set pressure of the models other than AL-150TR. Besides, set pressure
adjustment for AL-150TR must be done according to the set pressure range shown in Table 2.
2. For AL-150TR, be sure to turn the handle or tighten/loosen the lock nut by hand. Be careful not to
turn it with excessive force or turn too much.
* Handle can be turned only within the limited numbers of turns. Using tools or turning it with excessive
force causes damage to the handle or malfunction of the product.
Procedure for adjusting the set pressure of AL-150TR (See” Fig. 2 Structure.”)
1. Loosen the lock nut [12] by turning it counterclockwise by hand. (Outer peripheral surface of
the lock nut [12] is knurled for easy turning by hand.)
2. To increase the set pressure, turn the handle [18] clockwise. To decrease the set pressure,
turn the handle [18] counterclockwise. Each turn must be slow and 1/4 to 1/3 of full turn. Also
check the operation of the product per each turn.
3. After the completion of adjustment, tighten the lock nut [12] by turning it clockwise by hand.
Set pressure adjustment must be done according the set pressure range shown in Table 2. Please
note that the range differs per size.
Table 2 Set pressure range of AL-150TR
Nominal
size
Set pressure range (MPa)
A B C D E F
15A 0.05
～ 0.2 0.21 ～ 0.4 0.41 ～ 0.55 0.56 ～ 0.75 0.76 ～ 1.0
――――
20A 0.05
～ 0.2 0.21 ～ 0.35 0.36 ～ 0.45 0.46 ～ 0.6 0.61 ～ 0.75 0.76 ～ 1.0
25A 0.05
～ 0.2 0.21 ～ 0.35 0.36 ～ 0.45 0.46 ～ 0.55 0.56 ～ 0.8 0.81 ～ 1.0
32A 0.05
～ 0.2 0.21 ～ 0.4 0.41 ～ 0.65 0.66 ～ 1.0
――――― ――――
40A 0.05
～ 0.2 0.21 ～ 0.4 0.41 ～ 0.65 0.66 ～ 0.8 0.81 ～ 1.0
――――
50A 0.05
～ 0.2 0.21 ～ 0.4 0.41 ～ 0.65 0.66 ～ 0.8 0.81 ～ 1.0
――――