MIYAWAKI G11N User manual

BALL FLOAT STEAM TRAP
G11N/G12N
USER'S MANUAL

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):
(Shown as MAX. P. on the name plate)
G11N-2 0.2 MPa (29 psig)
G11N-8, G12N-8 0.8 MPa (116 psig)
G11N-16, G12N-16 1.6 MPa (232 psig)
4) Maximum operating temperature (TMO): 220 °C (428 °F)
(Shown as MAX.T. on the name plate)
5) Size: G11N:15 mm (1/2”) & 20 mm (3/4”)
G12N: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 G11N/G12N 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.
SAFETY GUIDE
The models G11N and G12N are cast iron mechanical ball float steam traps
with thermostatic air vent.
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):
(Shown as MAX. P. on the name plate)
G11N-2 0.2 MPa (29 psig)
G11N-8, G12N-8 0.8 MPa (116 psig)
G11N-16, G12N-16 1.6 MPa (232 psig)
4) Maximum operating temperature (TMO): 220 °C (428 °F)
(Shown as MAX.T. on the name plate)
5) Size: G11N:15 mm (1/2”) & 20 mm (3/4”)
G12N: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 G11N/G12N 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.

3
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 G11N and G12N 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 steam using equipment. Be sure to maintain
a slight slope of the pipe, so that any condensate will flow smoothly to the trap.
3INSTALLATION
Downstream line
Upstream line
Name Plate
Clearance for maintenance:
More than 100 mm(G11N)/140 mm(G12N)
Flow direction is
indicated by an arrow.
2
2CONSTRUCTION DETAILS









1.
Body
11.
Set Bolt
2.
Cover
12.
Cover Gasket
3.
Float
13.
Cover Bolt
4.
Lever
14.
Plug
5.
Valve Seat
15.
Air Vent
6.
Seat Gasket
16.
Plug
7.
Valve
30.
Plug
8.
Spring
31.
Plug
9.
Pin
32.
Name Plate
10.
Bracket
33.
Rivet

3
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 val
ves 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 G11N and G12N 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 steam using equipment. Be sure to maintain
a slight slope of the pipe, so that any condensate will flow smoothly to the trap.
3INSTALLATION
Downstream line
Upstream line
Name Plate Clearance for maintenance:
More than 100 mm(G11N)/140 mm(G12N)
Flow direction is
indicated by an arrow.

5
5MAINTENANCE
WARNING
⚫Before removing the 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 trap body is equal to the atmospheric pressure).
After it has fully cooled down (after the temperature of the 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 steam 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 steam control systems and equipment working well.
5.1 Tools for Diagnosis Steam Traps
◼Dr. Trap
Dr. Trap is a sophisticated steam trap management system for diagnosing steam traps
automatically by measuring the vibration and temperature of the steam trap. Survey
results are stored in the testing equipment and transferred to a steam trap analysis
software. The software aggregates and analyses steam trap survey data, identifying
faulty steam traps, providing steam loss and financial loss data, estimating CO2 emissions
corresponding to leaking steam traps and providing many other analyze possibilities to
manage the steam trap population easily.
◼Dr. Trap Jr.
Dr. Trap Jr. is an inexpensive and easily to handle steam trap diagnostic system
consisting of an ultrasonic checker, temperature probe and a sophisticated analysis
software. The software allows to determine the condition of a steam trap, to estimate
steam and financial losses and the related CO2 emissions.
For more details, please, check our homepage:
https://www.miyawaki.net/en/products/steam-trap-management-system
or ask our local representative.
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 trap outlet side.
3) Open the stop valve on the trap inlet side.
4.2 Stop procedure
1) Close the stop valve on the trap inlet side.
2) Close the stop valve on the trap outlet side.
* When stopping for a long time, completely drain the condensate from the piping and trap
and close the valves before and after the trap.

5
5MAINTENANCE
WARNING
⚫Before removing the 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 trap
body is equal to the atmospheric pressure).
After it has fully cooled down (after the temperature of the trap
body has
reached ambient temperature), confirm for safe conditions and then begin to
work.
⚫Even when the isolation valves are closed, there may b
e 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 steam 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 steam control systems and equipment working well.
5.1 Tools for Diagnosis Steam Traps
◼Dr. Trap
Dr. Trap is a sophisticated steam trap management system for diagnosing steam traps
automatically by measuring the vibration and temperature of the steam trap. Survey
results are stored in the testing equipment and transferred to a steam trap analysis
software. The software aggregates and analyses steam trap survey data, identifying
faulty steam traps, providing steam loss and financial loss data, estimating CO2 emissions
corresponding to leaking steam traps and providing many other analyze possibilities to
manage the steam trap population easily.
◼Dr. Trap Jr.
Dr. Trap Jr. is an inexpensive and easily to handle steam trap diagnostic system
consisting of an ultrasonic checker, temperature probe and a sophisticated analysis
software. The software allows to determine the condition of a steam trap, to estimate
steam and financial losses and the related CO2 emissions.
For more details, please, check our homepage:
https://www.miyawaki.net/en/products/steam-trap-management-system
or ask our local representative.

7
Torque table
CAUTION
When reassembling always replace the Gaskets (6) and (12) with new ones. Tighten
the Cover Bolts (13) evenly crosswise.

Model
Parts
Shape
Size
Torque
G11N, G12N
Valve seat (5)
Hexagon
17 mm (0.67”)
25 N･m
G11N, G12N
Set bolt (11)
Hex Socket
5 mm (0.20”)
11 N･m
G11N
Cover bolt (13)
Hexagon
13 mm (0.51”)
30 N･m
G12N
17 mm (0.67”)
50 N･m
G11N, G12N
Air vent (15)
17 mm (0.67”)
25 N･m
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6
5.2 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.
5.2.1 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) The Air Vent (15) can be dismantled with a spanner.
(Refer to the right picture)
CAUTION
Clean the Body and Cover with care not to damage the sealing surface. Scratches
on the sealing surface may cause steam leakage.
Take appropriate measures according to “6. Troubleshooting”. After cleaning the trap and
replacing damaged parts, reassemble the parts in reverse order as follows. Refer to the
torque table for each part.
5.2.2 Reassembling the trap
1) Reinstall the Air Vent (15) to the cover (2). As with disassembly, use a wrench so that
the pin of the wrench and air vent are parallel.
2) Reinstall the bracket (10) to the cover (2) so that the hole for the set bolt and the hole
for the valve seat (5) are lined up with the holes in the cover (2).
3) 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.
4) Make sure that the spring (8) and the valve (7) are installed in the correct position in
the lever (4) support section.
5) 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.
6) Reinstall the body (1) to the cover (2). And then tighten the 4 cover bolts (13).
e

Air Vent
Spanner
Pin

7
Torque table
CAUTION
When reassembling always replace the Gaskets (6) and (12) with new ones. Tighten
the Cover Bolts (13) evenly crosswise.

Model
Parts
Shape
Size
Torque
G11N, G12N
Valve seat (5)
Hexagon
17 mm (0.67”)
25 N
･
m
G11N, G12N
Set bolt (11)
Hex Socket
5 mm (0.20”)
11 N
･
m
G11N
Cover bolt (13) Hexagon
13 mm (0.51”)
30 N
･
m
G12N
17 mm (0.67”)
50 N
･
m
G11N, G12N
Air vent (15)
17 mm (0.67”)
25 N
･
m
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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.
8
6 TROUBLESHOOTING
Problem Possible cause Solution
Steam leaks or blows
through.
Scale and/or dirt lodged
between valve (7) and valve
seat (5).
Remove scale or dirt.
The air vent (15) is damaged. Replace the air vent (15) as a
whole.
Piece of scale lodged between
valve and seat of the air vent
(15).
Remove scale or dirt.
The bypass valve is open. Close it.
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 air vent (15) is loose Retighten the air vent (15).
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).
Condensate logging
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.

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.

11
9GUIDANCE FOR READING A 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
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
2 9XM → Oct. 21, 2029
Example of serial number designation
17112C020 → Jan., 2017
29X05M050 → Oct., 2029

11
9
GUIDANCE FOR READING A 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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ᐤࡢᘢ♫࣑ࣖ࣡࢟ࡲ࡛࠾ၥ࠸ྜࢃࡏࡃࡔࡉ࠸ࠋ
zእほཬࡧ௙ᵝ࡞࡝ࡣࠊ〇ရᨵⰋࡢࡓࡵண࿌࡞ࡋ࡟୍㒊ኚ᭦ࡉࡏ࡚㡬ࡃࡇ࡜ࡀ࠶ࡾࡲ
ࡍࠋ
z© 2020 MIYAWAKI INC.
This user’s manual may not be reproduced or copied in whole or in part, without the
written consent of MIYAWAKI INC.
zSome 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.
zIn 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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Tel㸸06-6302-5531(௦)
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.net 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]
www.miyawaki-inc.com.cn e-mail: [email protected]
808094-03 2105
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