MIYAWAKI TB7N User manual

TEMPERATURE CONTROL STEAM TRAP
USER'S MANUAL

SAFETY GUIDE
The model TB7N is a bimetal temperature control steam trap that has
superior durability and essentially doesn't allow steam to leak.
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 SETTING THE TEMPERATURE 4
5 STROKE CHART 6
6 OPERATION 7
7 MAINTENANCE 8
8 SCALE REMOVAL OPERATION (TYPE TB-SR ONLY) 11
9 TROUBLESHOOTING 13
10 WARRANTY 14
11 SERIAL NUMBER (S. No.) DESIGNATION 15
12 GUIDANCE FOR READING SPECIAL PRODUCT
NAME 16

1
1 SPECIFICATIONS 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).
The following items are displayed on the name label or the side of the product.
Check each item to avoid misuse of the product.
1) Maximum allowable pressure (PMA): 4.0 MPa (580 psig)
*TB7BN-C/ TB7BNF-C/ TB7BNW-C: 0.98 MPa (142 psig)
2) Maximum allowable temperature (TMA): 400 °C (752 °F)
*TB7BN-C/ TB7BNF-C/ TB7BNW-C: 183 °C (361 °F)
*TB7N-SR/ TB7NF-SR/ TB7NW-SR: 230 °C (446 °F)
3) Maximum operating pressure (PMO): 2.1 MPa (305 psig)
*TB7BN-C/ TB7BNF-C/ TB7BNW-C: 0.98 MPa (142 psig)
4) Maximum operating temperature (TMO): 350 °C (662 °F)
*TB7BN-C/ TB7BNF-C/ TB7BNW-C: 183 °C (361 °F)
*TB7N-SR/ TB7NF-SR/ TB7NW-SR: 230 °C (446 °F)
5) Size: 15 mm (1/2”), 20 mm (3/4”), 25 mm (1”)
6) Set temperature: The temperature at which the condensate will be discharged from
the steam trap.
7) 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.
8) Flow direction: Shown by an arrow
9) Body material: A105
10) Model: Showing the product model name
 Some pictures and illustrations in this manual are examples of TB7N models. For more details
regarding dimensions and other specifications, please refer to the catalog.
The model TB7N fully complies with the requirements of the European Pressure
Equipment Directive 2014/68/EU. It is classified according to Article 4, Section 3 of the
PED, which does not allow to bear the CE marking.

2
2 CONSTRUCTION DETAILS
1. Body
2. Cover
3. Valve Seat
4. Valve
5. Spring
6. Holder
7.
Bimetal
8. Washer
9. E-Ring
10. Shaft
11. Adjust Bolt
12. Adjust Nut
13. O-Ring
14.
Cover Gasket
15. Cap
16. Cap Gasket
17. Screen
18. Seat Gasket
25. O-Ring
(11)
(12)
(13)
(7)
(6)
(5)
(4)
(3)
(17)
(25)
(10)
(15)
(14)
(18)
(1)
(2)
(16)
(8)
(9)

3
3 INSTALLATION
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 body.
3) The TB7N can be used for both horizontal and vertical lines. However, be sure not to
install it upside-down in a horizontal line, as it will cause the trap to malfunction.
When installing a TB7N in a horizontal line, be sure to maintain a slight slope to the
line, so that any condensate will flow smoothly to the trap.
4) Open the isolation valve on the upstream line and make sure the product works
normally.
Name Plate
Flow direction is
indicated by an
arrow.
Clearance for
maintenance:
More than 30 mm
Upstream line
Downstream line