MIYAWAKI AG11 User manual

BALL FLOAT AIR TRAP
AG11/AG12
USER'S MANUAL

SAFETY GUIDE
The models AG11 and AG12 are cast iron mechanical ball float air traps.
In order to get maximum benefit from this product, be sure to read this
manual before installing it.
The following warnings and cautions are shown at appropriate
places in this manual.
WARNING
Failure to observe this type of precaution may
lead to serious injury or death.
CAUTION
Failure to follow this type of precaution can
lead to injury or damage to equipment and
property.
Table of Contents
1 SPECIFICATIONS AND MARKINGS
1
2 CONSTRUCTION DETAILS
2
3 INSTALLATION
3
4 OPERATION
4
5 MAINTENANCE
5
6TROUBLESHOOTING
8
7 WARRANTY
9
8 SERIAL NUMBER (S. No.) DESIGNATION
10
9 GUIDANCE FOR READING SPECIAL PRODUCT
NAME
11

1
1SPECIFICATIONS AND MARKINGS
WARNING
Be sure not to use this product at higher pressures than the specified maximum
allowable pressure (PMA) or at temperatures higher than the specified maximum
allowable temperature (TMA).
Check each item to avoid misuse of the product.
1) Maximum allowable pressure (PMA): 1.6 MPa (232 psig)
2) Maximum allowable temperature (TMA): 220 °C (428 °F)
3) Maximum operating pressure (PMO):
AG11-2 0.2 MPa (29 psig)
AG11-9, AG12-9 0.97 MPa (140 psig)
4) Maximum operating temperature (TMO): 100 °C (212 °F)
5) Size: AG11: 15 mm (1/2”) & 20 mm (3/4”)
AG12: 20 mm (3/4”) & 25 mm (1”)
6) Year of production: The two leftmost digits in the four-digit or nine-digit “S. No.” are
the last two digits of the year of production.
7) Flow direction: Shown by an arrow
8) Body material: Cast iron FC250
9) Model: Showing the product model name
⚫Some pictures and illustrations in this manual are examples of AG11/AG12 models. For more details
regarding dimensions and other specifications, please refer to the catalog.
The products fully comply with the requirements of the European Pressure Equipment
Directive 2014/68/EU. They are classified according to Article 4, Section 3 of the PED,
which does not allow to bear the CE marking.

2
2CONSTRUCTION DETAILS
Model AG11
Model AG12
1.
Body
14.
Cover Plug
2.
Cover
15.
Blow Shaft
3.
Float
16.
E-Ring
4.
Lever
17.
Handle
5.
Valve Seat
18.
O-Ring
6.
Seat Gasket
19.
Blow Bush
7.
Valve
20.
Plug
8.
Spring
21.
Plug Gasket
9.
Pin
22.
Body Plug
10.
Bracket
23.
Body Plug
11.
Set Bolt
24.
Name Plate
12.
Cover Gasket
25.
Rivet
13.
Cover Bolt

3
3INSTALLATION
WARNING
Pay very careful attention when working in hazardous environments. There is a risk
of explosion and the possibility of dangerous gases leaking. Always check whether
the pipeline contains flammable, high pressure or high temperature materials
before starting to work.
⚫Make sure that isolation valves are installed on both the upstream and downstream
lines.
CAUTION
Before installing the product, open both isolation valves and the bypass valve, if
one exists, to blow out any debris or dirt inside the pipeline. After blowing out the
line, before starting to work, close the isolation valves and allow time for the
temperature to drop to a safe working temperature.
When installing the product, be sure to leave clearance for maintaining it.
1) Remove the dustproof seals covering both connections.
※Products shipped in plastic bags may not have dustproof seals.
2) Check the flow direction indicated on the side of the body.
3) The Models AG11 and AG12 must be installed horizontally. Be sure not to install the
products upside-down in a horizontal line, as it will cause the trap to malfunction.
4) Never confuse inlet with outlet.
5) Install the trap at the lowest point of the equipment. Be sure to maintain a slight slope
of the pipe, so that any condensate will flow smoothly to the trap.
6) Make sure, that an equalizing line willbe piped between the air trap and theequipment
which will be drained.
Downstream
line
Upstream
line
Name Plate
Clearance for maintenance:
More than 120mm (AG11)/140mm (AG12)
Flow direction is
indicated by an arrow.

4
4OPERATION
CAUTION
Before starting operation, open the bypass valve or blow valve completely and blow
off the scale in the piping.
4.1 Operation procedure
1) After blowing off the scale from the piping, close the bypass valve or blow valve.
2) Open the stop valve on the air trap outlet side.
3) Open the stop valve on the air trap inlet side.
4) Open the stop valve of the equalizing line of the air trap.
4.2 Stop procedure
1) Close the stop valve on the air trap inlet side.
2) Close the stop valve of the equalizing line of the air trap.
3) Close the stop valve on the air trap outlet side.
* When stopping for a long time, completely drain the condensate from the piping and air
trap and close the valves before and after the air trap.
4.3 Function of the blow-off valve unit
1) During normal operation the blow shaft of the
valve unit is pulled out completely.
2) To blow off the air trap push the blow shaft into the
air trap (see picture on the right).
3) After blowing make sure to remove the blow shaft
to the normal position otherwise the air trap will continue
to blow.

5
5MAINTENANCE
WARNING
⚫Before removing the air trap from the pipe or disassembling it, be sure to close
the isolation valves. Then, release the residual pressure from the trap body
(make sure that the pressure in the air trap body is equal to the atmospheric
pressure). After it has fully cooled down (after the temperature of the air trap
body has reached ambient temperature), confirm for safe conditions and then
begin to work.
⚫Even when the isolation valves are closed, there may be residual internal
pressure due to leaks from the isolation valves. Therefore, be very careful.
CAUTION
⚫When replacing parts, make sure the replacement parts are supplied by
MIYAWAKI.
The performance of air traps deteriorates gradually over time due to wear, corrosion or
dirt accumulating around the valve and the valve seat. Please conduct periodic diagnosis
of traps in order to keep the equipment working well.
5.1 Repairs
When a trap fails, it is necessary to clean the internal parts and to replace damaged parts.
Take the failed trap apart following the steps below.
5.1.1 Disassembling the trap
1) Loosen the Cover Bolts (13). Remove all inner parts together with the Cover (2).
2) Take out the Pin (9). Then the Lever (4) with the Float (3) can be removed. The Valve (7) and
the Spring (8) will come off.
3) Firm the Cover (2) with a vice and unscrew the Valve Seat (5). Remove the Set Bolt (11) and
the Bracket (10).
4) Unscrew the Blow Bush (19) and remove the complete Blow-off Valve Unit.
CAUTION
Clean the Body (1) and Cover (2) with care not to damage the sealing surface.
Scratches on the sealing surface may cause leakage.
Take appropriate measures according to “6. Troubleshooting”. After cleaning the air trap
and replacing damaged parts, reassemble the parts in reverse order as follows. Refer to
the torque table for each part.

6
5.1.2 Reassembling the trap
1) Reinstall the bracket (10) to the cover (2) so that the hole for the set bolt (11) and the
hole for the valve seat (5) are lined up with the holes in the cover (2).
2) Secure the valve seat (5) to the cover (2). In this case, make sure that the set bolt (11)
and the seat gasket (6) are fitted in the right place.
3) Make sure that the spring (8) and the valve (7) are installed in the correct position in
the lever (4) support section.
4) The bracket (10) should be lined up with the hole for the bracket (10). If you do this,
the pin (9) can be inserted easily and the lever (4) will be reinstalled on the bracket
(10) easily.
5) Reinstall the body (1) to the cover (2). And then tighten the 4 cover bolts (13).
6) Assemble the blow off unit, put it into the cover and tighten the blow bush (19).
Torque table
Model
Parts
Shape
Size
Torque
AG11, AG12
Valve Seat (5)
Hexagon
17 mm (0.67”)
25 N･m
AG11, AG12
Set Bolt (11)
Hex Socket
5 mm (0.20”)
11 N･m
AG11
Cover Bolt (13)
Hexagon
13 mm (0.51”)
30 N･m
AG12
Cover Bolt (13)
Hexagon
17 mm (0.67”)
50 N･m
AG11, AG12
Blow Bush (19)
Hexagon
17 mm (0.67”)
50 N･m
AG11, AG12
Plug (20)
Hexagon
17 mm (0.67”)
25 N･m
CAUTION
When reassembling always replace the Gaskets (6) and (12) with new ones. Tighten
the Cover Bolts (13) evenly crosswise.

7
22.Plug
23.Body Plug
1.Body
12.Cover Gasket
3.Float
4.Lever
8.Spring
7.Valve
5.Valve Seat
11.Set Bolt
10.Bracket
20.Plug
2.Cover
14.Cover
Plug
9.Pin
Blow Off
Valve Unit
13.Cover Bolt
Blow Off
Valve Unit
15.Blow Shaft
18.O-Ring
19.Blow Bush
17.Handle
16.E-Ring
22.Body Plug

8
6TROUBLESHOOTING
Problem
Possible cause
Solution
Air leaks or blows through.
Scale and/or dirt lodged
between valve (7) and valve
seat (5).
Remove scale or dirt.
Worn valve (7) and/or valve
seat (5).
Replace the valve (7) and/or
the valve seat (5).
The valve seat (5) is loose.
Retighten the valve seat (5).
The set bolt (11) is loose.
Retighten the set bolt (11).
The cover gasket (12) and/or
seat gasket (6) are worn.
Replace the gaskets.
The cover bolts (13) are loose
or uneven tightened.
Retighten the cover bolts (13).
Air leaks
from the
body.
From the
connection
between the
body and
cover
The cover bolts (13) are loose.
Retighten the cover bolts (13).
The cover gasket (12) is worn.
Replace the cover gasket (12).
Condensate logging and/or
no discharge
The valve seat (5) is clogged.
Clean the valve seat (5).
The float (3) is damaged or
filled up with water.
Replace the float (3).
The inlet valve is closed.
Open the inlet valve.
The strainer at the inlet pipe
side is clogged.
Clean the strainer.
The operating pressure is too
high.
Change the operating
pressure or select a trap for
higher pressure.
The capacity of the trap is too
low.
Check the operating conditions
and select a trap with higher
capacity.
Scale and/or dirt lodged
between valve (7) and valve
seat (5).
Clean the valve (7) and the
valve seat (5).
Condensate cannot flow
naturally into the trap.
Change the piping.
Lack of differential pressure.
Check the operating
conditions.
Wrong or no equalizing pipe
line
Check the piping and correct if
necessary.

9
7WARRANTY
7.1 Warranty period
The warranty period is 18 months after shipment or 12 months after installation, whichever
occurs first.
7.2 Details of the warranty
If the product stops working correctly within the warranty period, we will repair or replace
the product free of charge if the cause of the trouble is not one of the following items.
1) The precautions described in this manual were not observed.
2) User's errors or mistakes such as an inappropriate installation or incorrect handling,
or an excessively large impact caused by dropping
3) Problems caused by devices or equipment other than MIYAWAKI’s, or a disallowed
use environment
4) When a repair or modification has been performed by anyone other than MIYAWAKI
or people who are authorized to make such repairs
5) Intrusion of salt or other substances that promote significant rust or corrosion or
problems from fluids that contain the same substances
6) Consumable parts such as Packing, Gasket, O-ring, Diaphragm, etc.
7) Attachment or accumulation of foreign matter in the pipe, such as dust and scale
8) Problems from fires, natural disasters, or other force majeure which is not
MIYAWAKI’s responsibility
7.3 Warranty limitation
The remedy available under the warranty shall not exceed the sales price of the products
delivered, for any cause whatsoever.

10
8SERIAL NUMBER (S. No.) DESIGNATION
The following 4-digit or 9-digit “S. No.” is displayed on the product.
●For 4-digit display
S.No. □□□□
Represents the day.
Represents the month.
Represents the year. (last two digits of the
year according to the Western calendar)
●For 9-digit display
S.No. □□□□□□□□□
MIYAWAKI identification number
Represents the month.
Represents the year. (last two digits of the
year according to the Western calendar)
Month designation system
Month
1
2
3
4
5
6
7
8
9
10
11
12
Symbol
1
2
3
4
5
6
7
8
9
X
Y
Z
Day designation system
Day
1
2
3
4
5
6
7
8
9
10
11
12
Symbol
1
2
3
4
5
6
7
8
9
A
B
C
Day
13
14
15
16
17
18
19
20
21
22
23
24
Symbol
D
E
F
G
H
J
K
L
M
N
O
P
Day
25
26
27
28
29
30
31
Symbol
Q
R
S
T
U
V
W
Example of serial number designation
1711 → Jan.1, 2017
29XM → Oct. 21, 2029
Example of serial number designation
1 7 1 1 2 C 0 2 0 → Jan., 2017
29X05M050 → Oct., 2029

11
9GUIDANCE FOR READING SPECIAL PRODUCT
NAME
〇〇〇-○○-□
Special symbol:
The symbol applies only to
special products
(Please refer to table 1 for details)
Model symbol:
Product model name
Table 1 Symbol description
Suffix
Special contents
A
Trap for high-pressure gas installed property (only for Gas Trap)
C
Blow valve attached
K
Change of gasket
L
Special face to face dimension
M
Change of parts material
P, T
Change of operating pressure, temperature, condensate capacity, etc.
R
Change of screen mesh
V
Change of air vent
X
Other than mentioned above or complex of special contents above

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⚫外観及び仕様などは、製品改良のため予告なしに一部変更させて頂くことがありま
す。
⚫Copyright © 2021 MIYAWAKI INC. All Rights Reserved.
This user’s manual may not be reproduced or copied in whole or in part, without the
written consent of MIYAWAKI INC.
⚫Some special specifications of the product may found to be different from the ones in
the user's manual. If you have any question, please contact MIYAWAKI, our local
authorized agent, or the company where you purchased the product.
⚫In the interest of the development and improvement of our products, MIYAWAKI Inc.
reserves the right to change the specification of the products without prior notice.
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〒532-0021 大阪市淀川区田川北 2-1-30
Tel：[phone](代)
www.miyawaki-inc.com
INTERNATIONAL SALES DEPT.
2-1-30, Tagawakita, Yodogawa-ku, Osaka, 532-0021, Japan
Tel: [phone]
www.miyawaki.net e-mail: [email protected]
EU Importer and Authorized representative:
MIYAWAKI GmbH
Birnbaumsmühle 65, 15234 Frankfurt (Oder), Germany
Tel: [phone]
www.miyawaki.de e-mail: [email protected]
China Importer and Authorized representative:
MIYAWAKI WEST Co., Ltd.
Room 1705, No.1, Building No.311, Yanxin Road, Huishan Economic Development Zone,
Wuxi, Jiangsu, China
Tel: [phone]
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808040-02 2104
AG11/AG12