MIYAWAKI SV1 User manual

THERMODYNAMIC STEAM TRAP
USER'S MANUAL

SAFETY GUIDE
The model SV1 is a compact, disc type steam trap that also serves as
a bypass valve.
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
6 TROUBLESHOOTING 9
7 WARRANTY 10
8 SERIAL NUMBER (S.No.) DESIGNATION 11
9 GUIDANCE FOR READING SPECIAL PRODUCT NAME 12

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 Operating pressure (MAX. P.): 1.6MPa (230psig)
2) Maximum operating temperature (MAX. T.): 220°C (428°F)
3) Size: 10 mm (3/8”), 15 mm (1/2”), 20 mm (3/4”) or 25 mm (1”)
4) Year of production: The two leftmost digits in the four-digit or nine-digit 'S No.' on the
name plate are the last two digits of the year of production.
5) Flow direction: Shown by an arrow
6) Body material: WCB
7) Model symbol: Showing the product model name
Some pictures and illustrations in this manual are that of the representative model. For
more details regarding dimensions and other specifications, please refer to the catalog.

2
2 CONSTRUCTION DETAILS
1. Body
2. Bonnet
3. Seat
4. Disc
5. Cap
6. Bush
7.
Valve Seat
8. Spindle
9. Gland Packing
10. Gland Nut
11. Screen
12. Plug
13. Plug Gasket
14.
Bonnet Gasket
15. Gland bush B
16. Pin
17. Handle
18. Gland Bush A
19. Nut
20. Name Plate
(17)
(20)
(15)
(9)
(18)
(8)
(14)
(7)
(6)
(13)
(11)
(12)
(1)
(3)
(16)
(4)
(5)
(2)
(10)
(19)

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.
2) Check the flow direction indicated on the side of the body.
3) The SV1 can be used for both horizontal and vertical lines. However, when
installing a SV1 in a horizontal line, be sure to maintain a slight slope to the line, so
that any condensate will flow smoothly.
4) Open the isolation valve on the upstream line and make sure the product works
normally.

4
4 OPERATION
CAUTION
・In normal operation, use the SV1 with the bypass valve closed (with the handle
turned fully clockwise).
・If the SV1 is used for a long time with the bypass valve open, there is a possibility
that parts such as the Valve Seat may be damaged.
Model SV1 functions as blow off of by-pass valve when handle is turned counter
clockwise, and will function as thermodynamic steam trap when handle is turned
clockwise to full stop.

5
5 MAINTENANCE
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 main body is equal to the atmospheric pressure).
After it has fully cooled down (after the temperature of the main body has
reached ambient temperature), confirm for safe conditions and then begin 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 seat. To keep steam control systems and equipment
working well, periodic maintenance of steam traps is essential.
5.1 Tools for Testing Steam Traps
In order to test steam traps, ultrasonic testers, sound detectors, and thermometers have
been used for years. These tools are relatively easy to use and are useful for making
rough estimates of the level of deterioration in a defective trap. However, to determine
deterioration levels and steam losses quantitatively, special tools for testing steam traps
are required.
Dr. Trap and Dr. Trap Jr. are testing equipment that was developed specifically for
diagnosing steam traps and analyzing survey results automatically. Use these tools to
avoid tiresome jobs on site and save working time.
5.2 Working Conditions of a Steam Trap
Steam trap failures can be classified as either “Leaking” or “Plugged”. The level of steam
leaks is generally determined by the intensity of the ultrasonic vibration generated in the
valve seat inside of a steam trap. Plugging is diagnosed by measuring the surface
temperature. As plugging progresses due to a buildup of dirt in the trap, it finally becomes
completely plugged. Then the surface temperature will drop to around 40°C (104°F), or
lower.
5.3 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.

6
5.3.1 Disassembling the trap
1) Remove the bonnet (2).
2) The trap unit, including the handle (17), can be
taken out as one unit.
3) When the handle (17) turns clockwise, it will come
into contact with the gland nut (10).
4) When the spindle (8) connected to the handle (17)
is tilted against the trap unit, as shown in the figure
on the right, it can be taken out.
5) Take the cap (5) off the seat (3) of the trap unit, and
then remove the disc (4).
5.3.2 Disassembling the bonnet
1) Remove the nut (19) from the spindle (8).
2) Remove the name plate (20) and the handle (17).
3) Remove the gland nut (10) and then remove the gland bush B (15), two gland
packings (9), and the gland bush A (18).
5.3.3 Disassembling the screen
1) Turn the plug (12) counterclockwise to remove it, and remove the plug gasket (13).
2) Remove the screen (11).
After repairing the trap, re-assemble the parts in reverse order as follows.
5.3.4 Reassembling the screen
1) Put the screen (11) and the plug gasket (13) back on the plug (12).
2) Then fasten the plug.
5.3.5 Reassembling the bonnet
1) Put the gland bush A (18), two gland packings (9), and the gland bush B (15) on the
bonnet (2), in that order.
2) Screw the gland nut (10) onto the bonnet (2).
3) Put the handle (17) on the spindle (8), and tighten the nut (19).

7
5.3.6 Reassembling the trap
1) Put the disc (4) on the surface of the seat (3) in the
body (1).
*The disc with a groove should be facing down.
2) Fasten the cap (5) on the seat (3).
3) With the handle (17) touching the gland nut (10),
connect the spindle (8) to the trap unit, as shown in
the figure on the right.
4) Turn the handle (17) a little counterclockwise, so
that the top of the trap unit is placed in the bonnet
(2). (If the handle (17) is pulled up too much, the
bottom of the trap unit will not be in the pin hole.)
5) Align the pin (16) with the position of the pin hole in
the seat (3) of the trap unit and put the pin in.
6) Tighten the bonnet (2). When it becomes difficult to
tighten the bonnet, turn the handle (17) about one
turn counterclockwise and continue the tightening
the bonnet (2). Repeat this operation until the space
between the body (1) and the bonnet (2)
disappears. Then, tighten the bonnet (2) fully.
The torque for each part is shown in the following table.
Parts Tools Across the flats Torque
Bonnet (2) Torque wrench 41 mm (1.61”) 100N・m
Cap (5) Spanner 24 mm (0,94”) 60N・m
Bush (6) Torque wrench 12 mm (0.47”) 5-6 N・m
Gland Nut (10) Torque wrench 29 mm (1.14”) 25N・m
Plug (12) Torque wrench 29 mm (1.14”) 30N・m

8
(19)
(16)
1. Body
2. Bonnet
3. Seat
4. Disc
5. Cap
6. Bush
7. Valve Seat
8. Spindle
9. Gland Packing
10. Gland Nut
11. Screen
12. Plug
13. Plug Gasket
14. Bonnet Gasket
15. Gland Bush B
16. Pin
17. Handle
18. Gland Bush A
19. Nut
20. Name Plate
(20)
(17)
(10)
(15)
(9)
(18)
(2)
(14)
(8)
Trap Unit
(6)
(7)
(1)
(11) (13)
(12)
(5)
(4)
(3)