MIYAWAKI SL3 User manual


OPERATION MANUAL
FOR
Thermodynamic Steam Trap
MODEL:SL3



SAFETY
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．Introduction･･････････････････････････････････P.1
2．Dimensions and Specifications･････････････････P.1
3．Installation･･･････････････････････････････････P.1
4．Trouble Shooting･･････････････････････････････P.2
5．Maintenance ･････････････････････････････････P.4
6．Construction･･････････････････････････････････P.4
7．Warranty･････････････････････････････････････P.5
8．Serial number (S. No.) designation････････････P.6
9．Guidance for reading special product name････P.7

- 2 -
4．Trouble Shooting
The thermodynamic disc trap has an intermittent operation function.It will discharge and stop
at certain cycles. The improper operations will be：No discharge,trap hot or cold.
Continuous discharge condensate or steam.
Hunting,Chattering：The cycles being too short and/or a continuous noise without condensate
discharge.
Refer to the Drawing in Page 5
A．Inlet valve closed．
B．Trap installed backwards.
1.Install trap in the normal way.Read the arrow on the body.
C．Plugged inlet orifice.
1.disassemble Body(1) and Cap(3),clean the inlet orifice.
D．Disc struck to the seat by oils etc.
1.Dissassemble Body(1) and Cap(3),clean to the Disc(2) and
Body(1), relap if necessary.
E．Condensate locked in the control chamber.
1.Disassemble Body(1) and Cap(3) to take out the condensate
inside the control chamber.
2.This will happen especially where there are back pressure.
It is recommended to install check valve in the downstream
pipe.
F．Air locking.
1.Disassemble Body(1) and Cap(3) to take the air inside the
control chamber.
Is The Trap
Operating
Intermittent
Is The Trap
Cold or Hot
Cold
Hot
Is The Trap
Discharging
A．No condensate coming to the trap.
1.Leaking by-pass-valve or flanges upstream.
2.Vacum created on the upstream piping.
Install vacuum breaker upstream.
A．Normal Function
No
Yes
Yes
- 1 -
1. Introduction
Model SL3 is all strainless steel body miniature thermodynamic
steam trap made especially for tracing applications and steam irons.
The connection of SL3 is male screw with inlet side pipe tapr thread
And outlet side parallel pipe thread.
It is one of the smallest thermodynamic steam trap in the world.
2. Dimensions and Specifications

 


Model
No.
㻌
Size
Operating
Maximum
Material
Dimensions
Weight
(kg)
Connection
mm
Pressure
Temperature
of
(mm)
㻌
(inch)
MPa
℃
(°F)

Body
L
H1
H2
W
SL3 Screwed 8(1/4”) 0.03 to 1.0 㻌400
(428)
Stainless
Steel
(SUS416)
40 22 8 19 0.062
3. Installation

Before installing the trap, always blow off the sludge, scales, etc.
from the piping.
1)Install the trap according to the direction of the arrow on the body.
2)Thermodynamic steam traps can be installed either horizontally or vertically.
3)Install the outlet condensate piping at the lowest point of the steam using
equipment. The trap should be install so that condensate will flow naturally into
the trap.
！ &$87,216
1

- 2 -
4．Trouble Shooting
The thermodynamic disc trap has an intermittent operation function.It will discharge and stop
at certain cycles. The improper operations will be：No discharge,trap hot or cold.
Continuous discharge condensate or steam.
Hunting,Chattering：The cycles being too short and/or a continuous noise without condensate
discharge.
Refer to the Drawing in Page 5
A
．
Inlet valve closed
．
B．Trap installed backwards.
1.Install trap in the normal way.Read the arrow on the body.
C．Plugged inlet orifice.
1.disassemble Body(1) and Cap(3),clean the inlet orifice.
D．Disc struck to the seat by oils etc.
1.Dissassemble Body(1) and Cap(3),clean to the Disc(2) and
Body(1), relap if necessary.
E．Condensate locked in the control chamber.
1.Disassemble Body(1) and Cap(3) to take out the condensate
inside the control chamber.
2.This will happen especially where there are back pressure.
It is recommended to install check valve in the downstream
pipe.
F．Air locking.
1.Disassemble Body(1) and Cap(3) to take the air inside the
control chamber.
Is The Trap
Operating
Intermittent
Is The Trap
Cold or Hot
Cold
Hot
Is The Trap
Discharging
A
．
No condensate coming to the trap.
1.Leaking by-pass-valve or flanges upstream.
2.Vacum created on the upstream piping.
Install vacuum breaker upstream.
A
．
Normal Function
No
Yes
Yes
2

- 3 -
Steam
A
．
Scales lodeg between Disc(2) and Body(1).
1.Disassemble Cap(3),clean Disc(2) and Body(1).
B．Scale,oil,etc. sticking to the bottom part of Disc(2)
1.Disassemble Cap(3),clean Disc(2).
C．Worn Parts
1.Disassemble Cap(3),relap Disc(2)and Body(1).
D．Lack of differencial pressure.
1.Our disc traps are designed to operate at minimum differen-
cial pressure of 0.03MPa.Check the operating condition re-
place to another type of trap.
E．Scales etc.lodged in outlet orifice reducing the area.
1.Disassemble Cap(3),clean the outlet orifice.
F．High back pressure.
1.The practicle use of our disc trap are up 50％back press-
ure.Check the operating conditions,reduce back pressure or
change the trap to another types capable of handling high
back pressure.
G．Over pressure.
1.Check the operating conditions,change trap for higher
pressure.
A
．
Normal Function
Is The Trap
Operating
Intermittent
A
．
By installing one trap to several lines short circuiting
will occur.
1.Install trap to each line.
B．Steam locking-Submerged coils,and similar conditions.
1.By not having lift fitting structure steam will come to
the trap even though condensate formed.
Check the upstream piping and install lift fitting.
A
．
Lack of capacity.
1.Check the operating conditions,replace the trap with larger
capacity.
Continuous
or Hunting
Chattering
Is The Steam
Using
Equipment
Obtaining
Enough Heat
Condensat
e
Yes
Yes
No
No
No
3

- 4 -
5. Maintenance
A. Disassemble the cap (3) with a wrench turning
counter-clockwise,disc(2) will come out.
B. This trap has integral seat. The seat is
fixed to the body.
Please check the body (1), disc (2), cap (3)
and clean.
C. If there are no defects reassemble in the
opposite of dis assembling.
The clamp torque for the cap (3) is as the
Following chart.
D. IF the disc (2) and seat of the body(1)
is worn or defected please exchange the
whole trap to new one.
No.
Parts
Size
Clamp Torque
8
Plug
35mm
100N
･
m
6. Construction

1. Body
2. Disc
3. Cap
4. Name Plate

When disassembling a hot trap
be, sure to release the pressure inside to
atmospheric pressure, and cool the trap before the opening it.
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4

- 5 -
7. Warranty
7.1 Warranty period
The warranty period shall last 12 months from the date of product delivery.
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 ours, or a disallowed use
environment
4) When a repair or modification has been performed by anyone other than us 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 our
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.
7. SERIAL NUMBER (S.No.) DESIGNATION
1
10 Serial number (S. No.) designation
S.No. 
Represents the day.
Represents the month.
Represents the year. (last two digits of the year
according to the Western calendar)
Month designation system
Symbol
Month
Symbol
Month
Symbol
Month
Symbol
Month
1
1
4
4
7
7
X
10
2
2
5
5
8
8
Y
11
3
3
6
6
9
9
Z
12
Day designation system
Symbol
Day
Symbol
Day
Symbol
Day
Symbol
Day
1
1
9
9
H
17
Q
25
2
2
A
10
J
18
R
26
3
3
B
11
K
19
S
27
4
4
C
12
L
20
T
28
5
5
D
13
M
21
U
29
6
6
E
14
N
22
V
30
7
7
F
15
O
23
W
31
8
8
G
16
P
24
Example of serial number designation
1 7 1 1 →Jan 1, 2017
2 9 X M →Oct 21, 2029
6
5

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

- 7 -
9. Guidance for reading special product name
〇〇〇-○○-□
Special symbol:
Symbol apply only to special product
(Please refer to table 1 for details)
English letter after “-“
Model symbol:
Product model number
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
8. GUIDANCE FOR READING SPECIAL PRODUCT NAME
22
11 Guidance for reading special product name
〇〇〇
-
○○
-
□
Special symbol:
Symbol apply only to special product
(Please refer to table 1 for details)
English letter after “-“
Model symbol:
Product model number
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
7
7