MIYAWAKI RE3 Instruction manual

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INSTALLATION,OPERATION and
MAINTENANCE MANUAL
Pilot Operated
Pressure Reducing Valve
RE3
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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.

S No. on the name plate of our product indicates a manufacturing date.
Indicating method of S No.
S.No. ڧڧڧڧ
indicates a day
indicates a month
indicates a year
Example of indicating a year
05 Ѝ200515 Ѝ2015
Method of indicating a month
Mark
Month
Mark
Month
Mark
Month
Mark
Month
1
January
4
April
7
July
X
October
2
February
5
May
8
August
Y
November
3
March
6
June
9
September
Z
December
Method of indicating a day
Mark
Day
Mark
Day
Mark
Day
Mark
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)
In case that S.No. is 0516, the manufacturing date is January 6, 2005
In case that S.No. is 15XM, the manufacturing date is October 21, 2015

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CONTENTS
1㸬INTRODUCTION 㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃P.1
2㸬TECHNICAL DATA AND DIMENSION㺃㺃㺃㺃㺃P.1
3㸬INSTALLATION  㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃P.2
4㸬INSTALLATION EXAMPLE㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃P.3
5㸬ADJUSTMENT㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃P.4
6㸬TROUBLE SHOOTING㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃P.4

7㸬MAINTENANCE㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃P.6
8㸬WARRANTY㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃㺃P.10
ۻGUIDANCE FOR READING SPECIAL PRODUCT NAME㺃P.11

2
1. Introduction
The MIYAWAKI –pressure reducing valve RE 3 is a pilot operated pressure regulator
equipped with micro bellows and designed for use in steam lines.
Prior to using the RE3 , read this manual thoroughly to understand the correct handling
and operating procedure.
The manual should be used by experienced personnel as a guide to the installation and
maintenance of the RE 3.
We ask you to contact MIYAWAKI or its local representative if further information is
required.
2. Technical Data and Dimension
Pressure Reducing Valve Type RE 3
Connection: Screwed
Size (inch): ½, ¾, 1, 1 ¼, 1 ½, 2
Maximum Primary (Inlet)Pressure: 16 bar / 230 psig
Adjustable Secondary (Outlet)
Pressure: 0,35 to 12 bar / 4,4 to 174 psig
Maximum Operating Temperature: 220°C / 428°F
Maximum Pressure
Reducing Ratio: 20 : 1
Minimum Differential
Pressure: 0,7 bar / 10 psi
Dimensions (mm) Dimensions (inch) Weight
Type Size Connection L L1H1H2W L L1H1H2Wkg lb
½” 90 127 87 58 74 3.5 5.0 3.4 2.3 2.9 2,7 5.9
¾” 95 130 87 58 74 3.7 5.1 3.4 2.3 2.9 2,8 6.2
1” 100 132 87 58 74 3.9 5.2 3.4 2.3 2.9 2,8 6.2
1 ¼” 130 155 111 73 96 5.1 6.1 4.4 2.9 3.8 6,2 13.6
1 ½” 130 155 111 73 96 5.1 6.1 4.4 2.9 3.8 6,3 13.9
RE3
2”
Screwed
140 157 121 79 110 5.5 6.2 4.8 3.1 4.3 8,3 18.3

3
3. Installation
3.1. The pressure reducing valve should be installed in a horizontal pipe with the operating
part including the adjust unit turned upwards, with suitable bypass and isolating
valves.
3.2. To prevent water hammer and vibrations caused by incoming condensate it is
necessary to install a steam trap before the pressure reducing valve.
3.3. If you expect the average flow velocity to rise above 30m/sec, it is recommended to
increase the size of the pipe.
3.4. Pressure reducing valves may not be installed parallel. These valves are to be used
individually and independently.
3.5. In case the pressure reducing ratio exceeds 20 : 1 (for instance the secondary
pressure is lower than 0,8 bar at 16 bar primary pressure), the pressure reduction is
to be made in two steps. In that case, a distance of at least 3 meters has to be kept
between the two pressure reducing valves.
3.6. The distance between the pressure reducing valve and a solenoid valve must be of at
least 3 meters, if a solenoid valve with on/off function is installed upstream or
downstream of the pressure reducing valve. Otherwise, the pressure reducing valve
may not function in a stable way while the valve is opening or closing.
3.7. If a control valve is installed downstream of the pressure reducing valve, the distance
between the pressure reducing valve and the control valve must be of at least 2
meters. The disregard of this recommendation may cause an unstable function of the
pressure reducing valve as well.
3.8. As a pressure reducing valve used for steam normally does not close completely, it is
recommended to install a steam trap downstream for the case that the steam flow
comes to zero and condensate is arising in the steam line behind the pressure
reducing valve (dead end service).
3.9. To prevent an unusual rise of the outlet pressure a safety valve has to be installed.
3.10. The pipe in which the pressure reducing valve is installed, must be fixed so that the
weight and the vibration of the pipe do not directly influence the pressure reducing
valve.
3.11. Blow down the piping that leads to the PRV’s inlet from any dirt and scale before the
first start-up of the pressure reducing valve. This is particularly important in case of the
start-up of the pressure reducing valve after a long time of shut-down.
3.12. Before a long shut-down of the pressure reducing valve the condensate must be
completely discharged from the pipe. Furthermore the stop valves before and behind
the pressure reducing valve have to be closed.
2

4
3.13. The distance between the pressure reducing valveand a downstream pressure gauge
should be of at least 1 meter.
3.14. The length of the straight section of the upstream piping and the length of the straight
section of the downstream piping should be each at least 10 pipe diameters.
3.15. The steam trap and the pressure reducing valve should both be protected with a
strainer. The strainer should be installed in such a way that the screen will point
sidewards to avoid the accumulation of condensate in the area of the screen.
4. Installation example
1. Separator
2. Pressure Gauge
3. Stop Valve
4. Strainer
5. Pressure Reducing Valve RE 3
6. Reducer
7. Safety Valve
8. Steam Trap Type ES
9. Sight Glass Type TS 1

5
5. Adjustment
5.1. After the installation and before the adjustment of the pressure reducing valve close
the stop valves before and behind the pressure reducing valve and open the bypass to
remove all condensate and dirt from the pipe.
5.2. Close the bypass valve and pull the green handle while the stop valves are closed.
Turn the handle clockwise (looking from the outlet side towards the inlet side) to
release the adjust spring. The handle will turn easily when the spring gets free.
5.3. Open the stop valve downstream slightly. Than open the stop valve upstream slowly.
5.4. Pull out the handle again and turn it towards “H” (counterclockwise, looking from the
outlet side towards the inlet side) until the required pressure is attained.
5.5. Release the handle so that it will engage.
5.6. Now, open the stop valve downstream completely and check again the setted
pressure.
5.7. In case of a shut-down of the equipment the stop valve downstream must be closed
at first. The stop valve upstream is to be closed as a second step. When the
equipment will start up again open the stop valve downstream at first and than open
the stop valve upstream slowly.
6. Trouble Shooting
Problem Cause Solution
The downstream pressure
doesn't meet the set value.
Pressure was set
incorrectly.
Turn the handle (22) to
correct.
The upstream stop valve is
closed .
Open the valve.
The downstream stop valve
is closed .
Open the valve.
The pressure gauge does
not work properly.
Replace the pressure
gauge.
The steam quantity
upstream is too small.
Check the steam quantity
by using a bypass valve.
Insufficient capacity of the
pressure reducing valve.
Check the steam quantity
by using a bypass valve
and choose the correct
pressure reducing valve.
Remarks:
1. Please, wear gloves while installing the valve.
2. Do not touch the lock nut except when disassembling the valve.

6
The screen (20) of the
pressure reducing valve is
plugged.
Remove the plug (3) and
clean the screen.
The screen (21) before the
pilot valve is plugged.
Remove the plug (10) and
clean the screen (21).
Irregular movement of the
pilot valve (11) due to dirt.
Remove the plug (10) and
clean the pilot valve.
Irregular movement of the
main valve (4) due to dirt.
Remove the plug No.3
(for ½”-1”) or take off the
bottom flange (3)
(for 1 ¼”-2”) and clean the
main valve (4).
Irregular movement of the
piston (7) and the cylinder
(8).
Clean or replace the piston
(7) and the cylinder (8).
The openings connecting
the body with the cover are
plugged.
Remove the cover (2) and
clean the openings.
The secondary pressure
exceeds the set pressure.
Pressure was not set
correctly.
Turn the handle (22) to
correct.
Inlet and outlet were
installed the wrong way
round.
Install correctly according
to the flow direction.
The downstream stop valve
is closed.
Open the stop valve.
The valve in the bypass
pipe is open or is leaking.
Close or replace the valve.
The pressure gauge isn´t
working properly.
Replace the pressure
gauge.
Irregular movement of the
pilot valve (11) due to dirt.
Remove the plug (10) and
clean the pilot valve (11).
Irregular movement of the
main valve (4) due to dirt.
Remove the plug (3) (½”-1”)
or take off the bottom flange
(1 ¼” –2”) and clean the
main valve (4).
Irregular movement of the
piston (7) due to dirt.
Remove the cover (2) and
clean the piston (7).
The pilot valve (11) is
leaking because of dirt.
Remove the plug (10) and
clean the pilot valve (11)
and the valve seat (12).
The main valve (4) is
leaking because of dirt.
Remove the plug (3) (½“–
1“) or take off the bottom
flange (1 ¼“ –
2“) and clean
the main valve (4) and the
Seat (5).
The bellows (14) are
damaged or do not seal
completely.
Remove the adjust cover
(9) and change the bellows
(14).
Little or no steam demand. Install a steam trap and a
safety valve downstream.

7
7. Maintenance
The disassembly, the assembly and the replacement of parts may, in general, be done
with tools customary in the market.
When you disassemble the valve, pay attention that you start the maintenance work
only when the internal parts have cooled down and are not under pressure.
7.1. Piston and Cylinder Liner
Nr.. 37 -Bolt, Nut
Size ½“ –1“ 1 ¼“ –2“
Bolt Size 12 mm 17 mm
Torque 150kgf •cm 250kgf•cm
Spare Parts
No. Parts Name
7 Piston
8 Cylinder Liner
19 Piston Ring
30 Gasket
26 Gasket

8
7.2. Valve and Valve Seat
Nr. 3 -Plug
Size ½“ –1“
Plug size 30 mm
Torque 800 kgf •cm
Nr. 38 –Bolt
Size 1 ¼“ –2“
Bolt Size 17 mm
Torque 250 kgf •cm
Spare Parts
No. Parts Name
25 Gasket
5 Valve Seat
4 Valve
Nr. 5 –Valve Seat
Size ½” –1” 1 ¼” –1 ½” 2”
24 mm 36 mm 41 mm
Torque 600kgf •cm 1200 kgf •cm 1500 kgf •cm
7.3. Strainer Pilot Valve
Nr. 10 –Plug
Plug Size 24 mm
Torque 200 kgf •cm

9
7.4. Valve Seat and Bellows
Spare Parts
No. Parts Name
28 Gasket
14 Micro Bellows
12 Valve Seat Unit
Nr. 9 –Adjust Cover
Measurement 30 mm
Torque 900 kgf •cm
Nr. 12 –Valve Seat
Measurement 14 mm
Torque 300 kgf •cm
Nr. 34 –Lock Nut
Measurement 35 mm
Torque -

10
Material
Parts-No. Parts Name Material
1Body Brass
2Cover Brass
3
Plug( ½“-1“)
Bottom Flange
(1 ¼“-2“)
Brass
Brass
4Valve Stainless Steel
5Disc Stainless Steel
6Spring Stainless Steel
7Piston Brass
8Cylinder Liner Brass
9Adjust Cover Brass
10 Plug Brass
11 Pilot Valve Stainless Steel
12 Valve Seat Stainless Steel
13 SpringStainless Steel
14 Bellows Stainless Steel
15 Spring Special Alloy
16 Spring Holder Stainless Steel
17 Sleeve Brass
18 Adjust Bolt Stainless Steel
20 Screen Brass
21 Screen Stainless Steel
22 Handle Unit Plastic
31 Spring Stainless Steel
34 Lock Nut Brass
37 Bolt Carbon Steel
47 Shaft Stainless Steel

10

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 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
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 rst.
10

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 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
8.3 Warranty limitation
The remedy available under the warranty shall not exceed the sales price of the products
delivered, for any cause whatsoever.

11
ۻ
GUIDANCE FOR READING SPECIAL PRODUCT NAME
ۑۑۑ
-
ۑۑ
-
ڧ
㻌
㻌
Special symbol:
symbol apply only to special product
(Please refer to table 1 for details)
English letter after “-“
Model symbol:
Product model number
㻌
㻌
㻌
Table 1 Symbol description
Suffix
Special contents
A
Trap for high-pressure gas installed property
C
Blow valve attached
K
Change of gasket
L
Special face to face dimension
M
㻌
Change of parts material
P, T
㻌
Change of operating pressure, temperature, condensate capacity, etc
R
Change of screen mesh
V
Change of air vent
X
㻌
Other than mentioned above or complex of special contents above
㻌
㻌 㻌

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
808046-04 1911
RE3