MIYAWAKI RE2 Series User manual

DIRECT-ACTING PRESSURE REDUCING VALVE
RE2
USER'S MANUAL
  














23(5$7,210$18$/
)25
',5(&7$&7,1*35(6685(5('8&,1*9$/9(

02'(/5(6(5,(6






















SAFETY GUIDE
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.
Contents
1. Purpose of use
1
2. Specifications
1
3. Construction detials
2
4. Precautions for piping
3
5. Pressure adjustment procedure
4
6. Troubleshooting
5-6
7. Maintenance
7-8
8. Warranty
9
9. Serial number (S.No.) designation
10
10. Guidance for reading special product name
11

- 1 -
1. Purpose of use
The type RE2 is a compact and lightweight direct-acting pressure reducing valve for steam
that employs MIYAWAKI’s proprietary micro-bellows.
It is most suitable for small steam equipment and steam irons in, for example, the sawing and
laundering industries.
2. Specifications
Model
Connection
Operating
pressure
range
(Primary
pressure)
(MPa)
Control
pressure
range
(Secondary
pressure)
(MPa)
Maximum
pressure-
reducing
ratio
Maximum
operating
temperature
(ºC)
Body
material
Material
of
principal
parts
Dimensions
(mm) Weight
(kg)
Type Nominal
dia. (A) L H1
H2 W
RE2
Threaded
10 0.2~1.0 0.1~0.5 10:1 184 Brass SUS 50 89 31 42 0.56
Specification of accessory strainer
Model
Connection Maximum
operating
pressure
(MPa)
Maximum
operating
temperature
(ºC)
Material Screen
Mesh
Face-to-
face
dimension
(mm)
Weight
(kg)
Type
Nominal
dia. (A)
Body Screen
YBS Threaded 10 1.0 200 Bronze
Stainless
steel 100 65 0.2
1

- 2 -
3. Construction details
1. Body
2. Cover
3. Plug
4. Valve
5. Valve seat
6. Bellows
7. Spring stay
8. Spring
9. Sleeve
10. Handle
11. Seat bushing
12. Shaft
13. Spring
14. Adjust bolt
15. Screen
16. Gasket
17. Gasket
18. Gasket
19. Lock nut
20. Spring
21. Screw
22. Washer
23. Name plate
2

- 3 -
4. Precautions for piping
1) Take care to prevent the condensate from entering the pressure reducing valve. If condensate
flows into the pressure reducing valve, it can cause hunting and other phenomena and may
damage the sealing surface of the valve and valve seat, as well as the sliding section.
If condensate is expected to flow in the pressure reducing valve, install a separator, steam trap, or
others on the inlet side of the pressure reducing valve to prevent flow of condensate as much as
possible.
2) Take care to prevent rust, scale, and other foreign substances from flowing in the pressure
reducing valve.
Flow of a foreign substance in the pressure reducing valve can cause leakage (increase in the
secondary pressure) and other problems.
In order to keep foreign substances out, install the ancillary strainer (100 mesh) on the inlet side of
the pressure reducing valve. Install the strainer in a lateral direction (in the case of horizontal
piping) to prevent the stagnation of condensate.
Remove initial low-temperature condensate and foreign substances from the piping by blowing the
pipes before passing steam through the pressure reducing valve.
3) When a manual valve, solenoid valve, or other valves on the outlet side of the pressure reducing
valve are kept closed (dead-end service), install a steam trap between the pressure reducing valve
and the outlet valve to prevent water hammer and abnormal operation (increase in the secondary
pressure) of the pressure reducing valve.
4) Make the straight section of the piping upstream and downstream of the pressure reducing valve as
long as possible (more than ten times of the pipe diameter is recommended).
5) Avoid piping that is drastically narrowed upstream or downstream of the pressure reducing valve to
prevent pressure drop as much as possible.
6) Install a safety valve on the secondary side of the pressure reducing valve for safety and to prevent
damage of equipment and devices.
If a safety valve cannot be installed, use equipment or devices which have withstand pressure more
than equal to the primary pressure.
7) When the pressure reducing valve is not used for a long time, remove condensate from the piping
completely.
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.
！ 注意
Caution
You can take off the plug at the bottom of the body and
install a blowdown valve or a steam trap.
Note) Before blowing the pressure reducing valve, adjust
its handle to the zero point (the adjusting spring is free)
and close the stop valve on the outlet side.
Take off the plug at the bottom of the
body and connect the inlet pipe.
Put the removed plug to the inlet of the
bod y.
Note) Be careful not to let dust or scale
fall from the screen when checking the
strainer.
Steam
Steam
<Example of horizontal piping>
<Example of L-shaped piping>
3

- 4 -
5. Pressure adjustment procedure
1) Blow off low temperature condensate and foreign substances in the piping before flowing steam in
the pressure reducing valve.
2) Make sure that the stop valves upstream and downstream of the pressure reducing valve are
completely closed.
3) Pull the handle up gently and turn it to the right (direction of arrow L) to free the adjust spring.
(When the spring is free, the handle can be turned very lightly.)
4) Firstly open the secondary stop valve slightly, then open the primary stop valve slowly until it is
fully open.
5) Pull the handle up gently and slowly turn it to the left (direction of arrow H) to the specified
pressure while monitoring the pressure gauge.
6) When you release the handle, it is locked.
7) Open the secondary stop valve fully.
Note) - Be sure to wear gloves when you adjust the pressure.
- The lock nut (19) secures the cover (2), so do not touch it unless you disassemble the
pressure reducing valve.
19. Lock nut
4

- 5 -
6. Troubleshooting
6-1) Phenomenon: The primary pressure does not increase.
6-2) Phenomenon: The secondary pressure does not increase to the set pressure.
Cause of the problem
Action
Related to
piping
Shortage of steam volume supplied to
the primary side. (The capacity of the
boiler may be insufficient.)
1) Recheck the steam volume.
2) Reconsider the system.
The steam source valve is closed.
Open the steam source valve.
The pipe on the primary side is too small.
Review the pipe size.
Cause of the problem
Action
Due to piping
Incorrect pressure setting.
Turn the handle (10) for re-adjustment.
Insufficient pressure reducing valve
capacity
Re-select pressure reducing valve with
the proper capacity.
Clogging in the inlet side strainer.
Disassemble and clean the strainer.
The secondary side stop valve is closed.
Open the stop valve.
The pipe on the secondary side is too
small.
Review the pipe size.
Due to
internal parts
Clogged screen (15).
Clean the screen (17).If it is damaged,
replace it with a new one.
Poor sliding of the shaft (12).
Clean the sliding section of the shaft (12)
and the valve seat (5).
If the sliding section is damaged, replace
the valve unit with a new one.
The primary
pressure does not
increase.
The secondary
pressure does not
increase to the set
pressure.
The secondary
pressure exceeds
the set pressure.
The handle cannot
be operated.
Chattering occurs.
(Vibration noise of
the valve, etc.)
External steam
leakage
6-1)
6-2)
6-3)
6-4)
6-5)
6-6)
Pressure gauge
Stop valve
Stop valve
Pressure gauge
Type RE2
pressure
reducing valve
Y-type
strainer
Steam
5

- 6 -
6-3) Phenomenon: The secondary side pressure increases beyond the set pressure.
6-4) Phenomenon: The handle cannot be operated.
6-5) Phenomenon: The secondary pressure is unstable, and chattering occurs (vibration noise
of the valve, etc.).
6-6) Phenomenon: Steam leaks out.
For disassembly and assembly, refer to the maintenance procedure in Section 7.
Cause of the problem
Action
Due to piping
Incorrect pressure setting.
Turn the handle (10) for re-adjustment.
The consumption on the secondary side
is close to zero.
Install a trap on the secondary side of the
pressure reducing valve.
Wrong installation direction.
Install correctly according to the flow
direction.
Pressure gauge fault.
Replace the pressure gauge.
Due to
internal parts
Pressure leaks past the valve (4) due to
dirt and scale holding the valve open.
1) Push the screw (21) of the handle (10)
using a Phillips-head screwdriver.
(Refer to 7-2)
2) Clean the surfaces of the valve (4) and
the valve seat (5). If either surface is
damaged, replace the parts with new ones.
Poor sliding of the shaft (12).
Clean the sliding section of the shaft (12)
and the valve seat (5).
If the sliding section is damaged, replace
the valve unit with a new one.
3) Damaged bellows (6).
Replace the bellows (6) with a new one.
Cause of the problem
Action
Due to
internal parts
Incorrect operation of the handle
Pull the handle (10) up gently and then
turn it.
The sleeve (9) and adjust bolt (14) have
seized.
Replace the sleeve (9) and adjust bolt (14)
with new ones.
Cause of the problem
Action
Due to
working
condition
Condensate flows in from the primary
side.
Install a trap on the primary side of the
pressure reducing valve.
Used below the minimum adjustable flow
rate.
Re-select pressure reducing valve with
the proper capacity.
Due to
internal parts
Poor sliding of the shaft (12).
Clean the sliding section of the shaft (12)
and the valve seat (5).
If the sliding section is damaged, replace
the valve unit with a new one.
Cause of the problem
Action
Due to
internal parts
Loose cover (2) and plug (3)
1) Tighten them to the specified torque.
2) Put the sealing tape to the screw part of
the plug (3).
The bellows gaskets (17) or cover gasket
(18) is damaged.
Replace the gaskets (17) (18) with new
ones.
The bellows (6) is damaged.
Replace the bellows (6) with a new one.
6-3) Phenomenon: The secondary side pressure increases beyond the set pressure.
6

- 7 -
7. Maintenance
Before you take off or disassemble the pressure reducing valve from the
piping, be sure to close the stop valves on the inlet and outlet sides of the
pressure reducing valve.
When the assembly/disassembly is being performed, check that the pressure
inside the product equals to the atmospheric pressure and allow time for the
temperature to drop to a safe working temperature.
(When the product has high temperatures and pressures, it may cause fluid
ejection and serious injuries.)
Disassembly, assembly, and maintenance (replacement of parts) can be performed by using general
commercially available tools.
7-1. Check of the internal parts of the pressure-reducing valve
Clean the surface of the sliding section of the valve and the valve seat periodically (every three
to six months), as they need to be always kept clean.
Parts to be checked: Valve unit
Valve (4), sealing surface of the valve seat (5), sliding section of the shaft
(12), screen (15)
7-2. How to solve the problem of dust stuck in the valve section (simplified blow-off)
When valve leakage occurs due to dust, the type RE2
allows you to solve the problem by temporarily opening the
valve widely during operation through a simple process, as
shown in the figure.
Press a Phillips-head screwdriver or a similar tool against
the screw (21) (handle-securing screw) and push the
screwdriver down straight (by approximately 3–5 mm)
against the reaction force of the spring. Repeat this
several times.
If the screw can not be pushed due to a high set pressure,
turn the handle in the L direction (clockwise) to reduce the
secondary pressure before blowing. In this case, re-adjust
the secondary pressure after blowing.
*Be careful when blowing the pressure reducing valve, as the secondary pressure
increases temporarily.
7-3. Disassembling space
！ 警告
Warning
7

- 8 -
7-4. How to disassemble the adjusting section
1) Pull the handle (10) gently and turn it to the right (direction
of arrow L) to free the adjusting spring (8). (When the spring
(8) is free, the handle turns very lightly.)
2) Take off the securing screw (21) from the head of the
handle (10) by using a Phillips-head screwdriver and take
off the handle (10).
3) Loosen the lock nut (19) using a tool, pull it up, and take off
the cover (2) by using a tool (when you take of it by holding
the adjusting bolt (14) at the head of the cover, the internal
adjusting bolt (14) and sleeve (9) are detached together
with the cover).
4) Take off the bellows (6).
7-5. How to disassemble and assemble the valve unit
1) Take off the valve unit using a tool, take the shaft (12) out,
and clean the sliding section.
2) Take off the seat bush (11) from the bottom of the valve unit
using a tool, take the screen (15) out, and clean it. At this
time, the return spring (13) and the valve (4) are detached
together; and clean the sealing surface of the valve (4) and
the valve seat (5).
3) After cleaning, insert the valve (4) and return spring (13) into
the valve seat (5), attach the screen (15) on the outside,
and tighten the seat bus (11).
4) Insert the shaft (12) into the sliding section of the valve seat
(5) and tighten the valve unit to the body (1).
7-6. How to assemble the adjusting section
1) After tightening the valve unit, attach the bellows (6)
(including the spring stay (7)) and place the gasket (18).
2) Tighten the cover (2) (including the sleeve (9), adjusting bolt
(14), and lock nut (19)) to the body (1) using a tool and then
tighten the lock nut (19).
3) Attach the handle (10) to the adjusting bolt (14), place the
spring (20) and washer (22), and tighten the screw (21)
using a Phillips-head screwdriver.
4) When you assemble the cover, assemble the internal parts
vertically as shown in the figure on the right.
* The tools and the torque for each part are shown in the following table.
Part No.
Parts
Across the flats
Torque
Tool
2
Cover
30 mm
40 N∙m
Socket
3
Plug
8 mm
-
Hexagonal wrench key
5
Valve seat
12 mm
20 N∙m
Socket
11
Seat bush
12 mm
40 N∙m
Spanner
19
Lock nut
35 mm
13 N∙m
Spanner
48
Screw
-
-
Phillips-head screwdriver
21. Screw
22. Washer
20. Spring
10. Handle
2. Cover
19. Lock nut
14. Adjusting bolt
9. Sleeve
8. Spring
7. Spring stay
18. Gasket
6. Bellows
12. Shaft
5. Valve seat
4. Valve
13. Spring
15. Screen
11. Seat bushing
1. Body
3. Plug
Valve unit
8

- 9 -
8. Warranty
8-1 Warranty period
The warranty period shall last 12 months from the date of product delivery.
8-2 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 Gasket, O-ring, 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
8-3 Warranty limitation
The remedy available under the warranty shall not exceed the sales price of the products
delivered, for any cause whatsoever.
The warranty period is 18 months after shipment or 12 months after installation, whichever
occurs first.
- 9 -
8. Warranty
8-1 Warranty period
The warranty period shall last 12 months from the date of product delivery.
8-2 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 Gasket, O-ring, 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
8-3 Warranty limitation
The remedy available under the warranty shall not exceed the sales price of the products
delivered, for any cause whatsoever.
9

- 10 -
9 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
10

- 11 -
10 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
11

For any questions about the product that you purchased or about the details in this user’s
manual, please contact the following.
© 2017 MIYAWAKI INC.
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 you have, 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 place where you purchased.

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: [e-mail]
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]n
808045-03 2007
RE2