AsahiAV V82 User manual

Installation, Operation and Maintenance Manual
【H-V063-E-9】Self Control Valves (Pressure Reducing Type / Pressure Relief Type / Pressure Retaining Type)
Serial No. H-V063-E-9
Contents
1. Be sure to read the following warranty
clauses of our product 1
2. General operating instructions 2
3. General instructions for transportation,
unpacking and storage 2
4. Name of parts 3
5. Product functions and specifications 5
6. Working pressure vs. temperature 6
7. Valve flow characteristic 7
Pressure reducing type 7
Pressure relief & retaining type 8
8. Installation procedure 9
Flanged end 10
Threaded end 11
Socket end 12
9. Adjustment procedure for working pressure 13
10. Disassembling method for replacing parts 14
11. Inspection items 15
12. Troubleshooting 16
13. Handling of residual and waste materials 16
Self Control Valves
Pressure Reducing Type （V182，V82）
Pressure Relief Type （V185）
Pressure Retaining Type （V186）
User‘s Manual

Installation, Operation and Maintenance Manual
【H-V063-E-9】Self Control Valves (Pressure Reducing Type / Pressure Relief Type / Pressure Retaining Type) 1
This user’s guide contains very important information for the proper installation, maintenance and safe
use of an ASAHI AV Product.
Please store this manual in an easily accessible location.
＜Warning & Caution Signs＞
This symbol reminds the user to take caution due to the potential for serious injury or death.
This symbol reminds the user to take caution due to the potential for damage to the valve if used
in such a manner.
＜Prohibited & Mandatory Action Signs＞
Prohibited: When operating the valve, this symbol indicates an action that should not be taken.
Mandatory action: When operating the valve, this symbol indicates mandatory actions that must
be adhered to.
1. Be sure to read the following warranty clauses of our product
- Always observe the specifications of and the precautions and instructions on using our product.
- We always strive to improve product quality and reliability, but cannot guarantee perfection. Therefore,
should you intend to use this product with any equipment or machinery that may pose the risk of
serious or even fatal injury, or property damage, ensure an appropriate safety design or take other
measures with sufficient consideration given to possible problems. We shall assume no responsibility
for any inconvenience stemming from any action on your part without our written consent in the form
of specifications or other documented approval.
- The related technical documents, operation manuals, and other documentation prescribe precautions
on selecting, constructing, installing, operating, maintaining, and servicing our products. For details,
consult with our nearest distributor or agent.
- Our product warranty extends for one and a half years after the product is shipped from our factory or
one year after the product is installed, whichever comes first. Any product abnormality that occurs
during the warranty period or which is reported to us will be investigated immediately to identify its
cause. Should our product be deemed defective, we shall assume the responsibility to repair or
replace it free of charge.
- Any repair or replacement needed after the warranty period ends shall be charged to the customer.
- The warranty does not cover the following cases:
(1) Using our product under any condition not covered by our defined scope of warranty.
(2) Failure to observe our defined precautions or instructions regarding the construction, installation,
handling, maintenance, or servicing of our product.
(3) Any inconvenience caused by any product other than ours.
(4) Remodeling or otherwise modifying our product by anyone other than us.
(5) Using any part of our product for anything other than the intended use of the product.
(6) Any abnormality that occurs due to a natural disaster, accident, or other incident not stemming
from something inside our product.
* Note that damage induced by a defect of our product is not covered by warranty.
- This guarantee applies to the use of our product only in Japan. If it is used overseas, please inquire
with us separately.
Caution
Warning

Installation, Operation and Maintenance Manual
【H-V063-E-9】Self Control Valves (Pressure Reducing Type / Pressure Relief Type / Pressure Retaining Type) 2
2. General operating instructions
- Using a positive-pressure gas with our plastic piping may pose a dangerous condition due to the
repellent force particular to compressible fluids even when the gas is under similar pressures
used for liquids. Therefore, be sure to take the necessary safety precautions such as covering
the piping with protective material. For inquiries, please contact us. For conducting a leak test on
newly installed piping, be sure to check for leaks under water pressure. If absolutely necessary
to use a gas in testing, please consult your nearest service station beforehand.
- Do not step on or apply excessive weight on valve. (It can be damaged.)
- Keep the valve away from excessive heat or fire. (It can be damaged, or destroyed.)
- Always operate the valve within the pressure vs. temperature range.(The valve can be damaged
or deformed by operating beyond the allowable range.)
- Do not use the valve to fluid containing slurry. (The valve will not operate properly.)
- Allow sufficient space for maintenance and inspection.
- Select a valve material that is compatible with the media. For chemical resistance information,
refer to “CHEMICAL RESISTANCE ON ASAHI AV VALVE”.(Some chemicals may damage
incompatible valve materials.)
- Do not use the valve in conditions where the fluid may have crystallized.(The valve will not
operate properly.)
- Keep the valve out of direct sunlight, water and dust. Use cover to shield the valve.(The valve
will not operate properly.)
- Perform periodic maintenance. (Leakage may develop due to temperature changes or over
periods of prolonged storage, rest or operation.)
3. General instructions for transportation, unpacking and storage
- When suspending and supporting a valve, take care and do not stand under a suspended valve.
- This valve is not designed to handle impacts of any kind. Avoid throwing or dropping the valve.
- Avoid scratching the valve with any sharp object.
- Do not over-stack cardboard shipping boxes. Excessively stacked packages may collapse.
- Avoid contact with any coal tar creosote, insecticides, vermicides or paint. (These chemicals
may cause damage to the valve.)
- When transporting a valve, do not carry it by the handle.
- Store products in their corrugated cardboard boxes. Avoid exposing products to direct sunlight,
and store them indoors (at room temperature). Also avoid storing products in areas with
excessive temperatures. (Corrugated cardboard packages become weaker as they become wet
with water or other liquid. Take care in storage and handling.)
- After unpacking the products, check that they are defect-free and meet the specifications.
Warning
Caution
Caution
Warning
Caution

Installation, Operation and Maintenance Manual
【H-V063-E-9】Self Control Valves (Pressure Reducing Type / Pressure Relief Type / Pressure Retaining Type) 3
4. Name of parts
○ Pressure Reducing Type
V182 （15mm～40mm { ½”- 1½” }）
V82 （50mm {2”}；PTFE spec only）
*1；Used for V82 *2；Used for V182 *3；Part for self control valve *4；Used for flange type
No. Description No. Description No. Description No. Description
［a1］ Body (Bottom) ［g］ Compressor*1 ［n1］ O-Ring (A) ［4］ Union nut
［a2］ Body (Top) ［h］ Compression spring ［n2］ O-Ring (B) ［5］ O-Ring (C)
［b］ Housing ［i］ Lock nut ［o］ Bolt, Nut, Washer ［6］ Stop ring*4
［c］ Diaphragm*1 ［j］ Adjusting screw ［p］ Spring support plate*2 ［7］ O-Ring (D)
［d］ Piston ［k］ Bolt, Washer*1 ［q］ Pressure gauge
［e］ Piston base*2 ［l］ Cap ［2］PJ-Body
*3
［f］ Spring plate ［m］ Ring seal ［3］ End connector

Installation, Operation and Maintenance Manual
【H-V063-E-9】Self Control Valves (Pressure Reducing Type / Pressure Relief Type / Pressure Retaining Type) 4
○Pressure Relief Type
V185 （15mm～50mm { ½”-2” }）
No. Description No. Description No. Description No. Description
［a］ Body ［g］ Compressor ［l］ Cap ［4］ Union nut
［b］ Housing ［h］ Compression spring ［o］ Bolt, Nut, Washer ［5］ O-Ring (C)
［c］ Diaphragm ［i］ Lock nut ［2］ PJ-Body*1 ［6］ Stop ring*2
［f］ Spring plate ［j］ Adjusting screw ［3］ End connector ［7］ O-Ring (D)
*1；Part for self control valve *2；Used for flange type
○Pressure Retaining Type
V186 （15mm～50mm { ½”-2” }）
No. Description No. Description No. Description No. Description
［a］ Body ［g］ Compressor ［l］ Cap ［4］ Union nut
［b］ Housing ［h］ Compression spring ［o］ Bolt, Nut, Washer ［5］ O-Ring (C)
［c］ Diaphragm ［i］ Lock nut ［2］ PJ-Body*1 ［6］ Stop ring*2
［f］ Spring plate ［j］ Adjusting screw ［3］ End connector ［7］ O-Ring (D)
*1；Part for self control valve *2；Used for flange type

Installation, Operation and Maintenance Manual
【H-V063-E-9】Self Control Valves (Pressure Reducing Type / Pressure Relief Type / Pressure Retaining Type) 5
5. Product functions and specifications
Functions
- The pressure reducing type (V182/V82) maintains a constant working pressure regardless of changes
or fluctuations in inlet pressure. Upon changes in pressure, the diaphragm either lifts against the
internal spring or is pressed down by the spring force until a state of equilibrium is re-established.
- The pressure relief type (V185) serves to keep the system pressure constant by balancing out pressure
pulsations and reducing pressure peaks. The third pipe (right angle to the piping) is installed directly in
the main pipeline (horizontal direction) through the pressure relief valve body. Fluid normally passes
through the main pipeline of the valve, and if the inlet pressure rises above the set value, the valve
piston lifts against the internal spring. Consequently, the valve opens and flow will pass through the
perpendicular leg until the inlet pressure begins to drop. When the inlet pressure drops below the set
pressure, the spring pushes against the valve piston until the valve closes and resumes normal
operation.
- The pressure retaining type (V186) serves to keep the upstream system pressure constant. If the inlet
pressure rises above the set value, the valve piston is lifted against the internal spring. The valve
closes as soon as the inlet pressure sinks below the pre-set spring tension.
Specifications
Pressure Reducing Type Pressure Relief
Type
Pressure Retaining
Type
Type V182 V82 V185 V186
Nominal size 15-40mm
(½”-1½”)
50mm
(2”)
15-50mm
(½”-2”)
15-50mm
(½”-2”)
Rubber material EPDM, FKM FKM (PTFE coted) *2 EPDM, FKM (PTFE coted) *2
Body material PVC
End connectors Flanged end, Socket end, Threaded end
Max. working pressure *1 1.0MPa {10.2 kgf/cm2} [150 PSI] at 20˚C (70˚F)
Working temperature 0-50˚C (32-122˚F)
Adjustment range on outlet 0.05-0.9MPa [7.5-130 PSI]
*1；Refer to the page of "Working pressure VS Temperature".
*2；Material of O-ring is FKM.

Installation, Operation and Maintenance Manual
【H-V063-E-9】Self Control Valves (Pressure Reducing Type / Pressure Relief Type / Pressure Retaining Type) 6
6. Working pressure vs. temperature
- Pressure Reducing Type (V182, V82), Pressure Relief Type (V185), Pressure Retaining Type (V186)

Installation, Operation and Maintenance Manual
【H-V063-E-9】Self Control Valves (Pressure Reducing Type / Pressure Relief Type / Pressure Retaining Type) 7
7. Valve flow characteristic
- Pressure Reducing Type (V182)
- Pressure Reducing Type (V82)
- The friction coefficient increases with the flow rate and
the outlet pressure decreases.
PE ： Set pressure (at a flow rate of 0 L/h)
PE-Pmin ： Max. pressure reduction value
・The set pressure is set at PE. If the flow rate is
increased to Q, the outlet pressure will decrease to PO.
PO line ： Opening pressure characteristic. (Flow rate
increasing)
ＰＳ line ： Closing pressure characteristic. (Flow rate
decreasing)
Hysteresis ： The flow rate is affected by the influence of
t
he spring, piston and diaphragm in the valve.
The working pressure is also a function of
these parts, and will change depending on
whether the flow rate is increasing or
decreasing.

Installation, Operation and Maintenance Manual
【H-V063-E-9】Self Control Valves (Pressure Reducing Type / Pressure Relief Type / Pressure Retaining Type) 8
- Pressure Relief Type (V185), Pressure Retaining Type (V186)
- The friction coefficient and inlet pressure increase with the
flow rate.
PＥ ： Set pressure (at a flow rate of 0 L/h)
PＡ ： Working pressure
PＳ ： Closing pressure. (At a flow rate of 0 L/h)
・ The set pressure is adjusted to PE at a flow rate of 0 l/h. If
the flow rate is increased to Q, the outlet pressure will
increase to PA.
ＰO line ： The change of inlet pressure (Flow rate increasing)
ＰＳ line ： The change of inlet pressure (Flow rate decreasing)
・ The outlet pressure is increased and decreased from PO
to PS by increasing and decreasing the flow rate.

Installation, Operation and Maintenance Manual
【H-V063-E-9】Self Control Valves (Pressure Reducing Type / Pressure Relief Type / Pressure Retaining Type) 9
8. Installation procedure
- When suspending and supporting a valve, take care and do not stand under a suspended valve.
- Be sure to conduct a safety check on all hand and power tools to be used before beginning
work.
- Wear protective gloves and safety goggles as fluid remain in the valve even if the pipeline is
empty. (You may be injured.)
- When installing a pipe support by means of a U-band or something similar, take care not to
over-tighten. (Excessive force may damage the pipe.)
- Take care not to over-tighten the Union Nut. (The valve can be damaged.)
- Do not use the pipe wrench. (The valve can be damaged.)
- Piping with care in the flow direction. (Align the flow direction with the arrow of the label.)
- The strainer should be installed in the upper stream line of the valve in order to avoid the
malfunction possibility caused by clogging of the valve by foreign matters.
- When installing pipes and valves, ensure that they are not subjected to tension, compression,
bending, impact, or other excessive stress.
- Before a water test, be sure that the Union Nut is tightly fastened.
- Fasten the Union Nut while avoiding the parallelism and axial misalignment of the flange surface.
- When connecting a ASAHI AV Valve to metal piping, take care not to let the pipe stress on the
ASAHI AV Valve.
Flow
Direction Main pipe
(Bidirectional Flow)
Third Pipe
15-32mm (½”-1¼”)
<Bottom>
40、50mm (1½”, 2”)
<Front>
Pressure Reducing Type
Pressure Retaining Type
Pressure Relief Type
Warning
Caution
Flow Direction Flow
Direction

Installation, Operation and Maintenance Manual
【H-V063-E-9】Self Control Valves (Pressure Reducing Type / Pressure Relief Type / Pressure Retaining Type) 10
Flanged End
- Use flat faced flanges for connection to AV Valves.
- Ensure that the mating flanges are of the same standards.
- Be sure to use sealing gaskets (AV Gasket), bolts, nuts, and washers and tighten them to
specified torques. (When a non-AV gasket is used, a different tightening torque instruction
should be followed.)
● Torque wrench ● AV gasket
Procedure
1) Set the AV gasket between the flanges.
2) Insert washers and bolts from the pipe side, insert washers and nuts from the valve side, then
temporarily tighten by hand.
- The parallelism and axial misalignment of the flange surface should be under the values shown in
the following table to prevent damage the valve. (A failure to observe them can cause destruction
due to stress application to the pipe.)
Nominal size Axial
misalignment
Parallelism
（a-b）
15-32mm
(½”-1¼”)
1.0mm
(0.04”)
0.5mm
(0.02”)
40，50mm
(1½”-2”)
1.0mm
(0.04”)
0.8mm
(0.03”)
3) Tighten the bolts and nuts gradually with a torque wrench to the specified torque level in a diagonal
manner.
4) Tighten it more than 2 turns clockwise with specified torque.
- Do not tighten above the specified torque value. (The valve can be damaged or leaks.)
Specified torque value Unit：N-m｛kgf-cm｝ [ib-inch]
Nominal size 15mm
(½”)
20mm
(¾”)
25mm
(1”)
32mm
(1¼”)
40mm
(1½”)
50mm
(2”)
PTFE coted
PVDF coted
17.5
｛179｝
[155]
17.5
｛179｝
[155]
20.0
｛204｝
[177]
20.0
｛204｝
[177]
20.0
｛204｝
[177]
22.5
｛230｝
[200]
Rubber
8.0
｛82｝
[71]
8.0
｛82｝
[71]
20.0
｛204｝
[177]
20.0
｛204｝
[177]
20.0
｛204｝
[177]
22.5
｛230｝
[200]
* When union nut is loosened or removed, please install in the following way.
5) Make sure that the O-ring (C)[5] is mounted.
5) Set the end connector and union nut directly on the body without allowing the O-ring (C) to come off.
7) Tighten union nut on each valve until hand tight.
8) Using a strap wrench tighten union nuts[4] uniformly on each side approx. 90˚- 180˚ turns, 1/4 to 1/2
turns.
Necessary items
Caution
Caution
（Axial misalignment）（Parallelism）
b
a
Caution

Installation, Operation and Maintenance Manual
【H-V063-E-9】Self Control Valves (Pressure Reducing Type / Pressure Relief Type / Pressure Retaining Type) 11
Threaded end
- Avoid excessive tightening. (The valve can be damaged.)
- The union nut of this product is fastened lightly so that it can be loosened easily. Be sure to
remove the end connector before carrying out the work. (Failure to so may cause external
leakage.)
- Make sure that the threaded connections are plastic x plastic. (Metallic thread can cause
damage.)
- Wrap the threaded joints on our plastic piping with sealing tape. Using a liquid sealing agent or
liquid gasket may cause stress cracks (Environmental Stress Cracking). Our product warranty
shall not apply in case of said use, even when said use is unavoidable.
● Sealing tape ● Strap wrench ● Spanner wrench
Procedure
1) Wind a sealing tape around the external thread of joint,
leaving the end (about 3mm) free.
2) Loosen the union nut with a strap wrench.
3) Remove the union nut and end connector from the body.
4) Tighten the external thread of the joint and the end
connector hardly with hand.
5) Using a spanner wrench, screw in the end connector by
turning 180˚ -360˚ carefully without damaging it.
6) Make sure that the O-ring (C) is mounted.
7) Set the end connector and union nut directly on the
body without allowing the O-ring (X) to come off.
8) Tighten union nut on each valve until hand tight.
9) Using a strap wrench tighten union nuts uniformly on each side approx. 90˚- 180˚ turns, 1/4 to 1/2 turns.
Necessary items
Union nut
End connector
Fitting
Sealing tape
Caution

Installation, Operation and Maintenance Manual
【H-V063-E-9】Self Control Valves (Pressure Reducing Type / Pressure Relief Type / Pressure Retaining Type) 12
Socket end
- When using an adhesive, ventilate the space sufficiently, prohibit the use of a fire in the vicinity,
and do not inhale adhesive vapors directly.
- If an adhesive gets into contact with your skin, wash it off immediately. If you feel sick or find
anomaly, receive a physician's diagnosis and take appropriate measures promptly.
- Do not under any circumstances try to insert a pipe into another fitting or valve by striking it.
(Which may break the piping.)
- Take care in doing work at low temperatures. Solvent vapors are hard to evaporate and are likely
to remain. (Solvent cracks may occur, damaging the equipment.) After assembling the piping
system, open both ends of the piping and use a fan (of the Low-pressure Type) or something
similar to ventilate the space, thus removing the solvent vapors.
- The union nut of this product is fastened lightly so that it can be loosened easily. Be sure to
remove the end connector before carrying out the work. (Failure to so may cause external
leakage.)
- Use the appropriate ASAHI AV cement.
- Conduct a water test at least 24 hours after joining the pipes with an adhesive.
● ASAHI AV cement ● Strap wrench
Procedure
1) Loosen the union nut with a strap wrench.
2) Remove the union nut and end connector from the body.
3) Lead the union nut through the pipe.
4) Make sure the hub part of the end connector is clean with waste
cloth.
5) Apply adhesive evenly to the hub part of the end connector
and the pipe spigot.
- Do not apply more adhesive than necessary. (The valve can be damaged due to solvent
cracking.)
Adhesive quantity (guideline)
Nominal size 15mm
(½”)
20mm
(¾”)
25mm
(1”)
32mm
(1¼”)
40mm
(1½”)
50mm
(2”)
Quantity（g） 1.0 1.3 2.0 2.4 3.5 4.8
6) After applying adhesive, insert the pipe quickly to the end connector and leave it alone for at least 60
seconds.
7) Wipe away overflowing adhesive.
8) Make sure that the O-ring (C) is mounted.
9) Set the end connector and union nut directly on the body without allowing the O-ring (C) to come off.
10) Tighten union nut on each valve until hand tight.
11) Using a strap wrench tighten union nuts uniformly on each side approx. 90˚- 180˚ turns, 1/4 to 1/2 turns.
Necessary items
Warning
Caution
Caution
Caution

Installation, Operation and Maintenance Manual
【H-V063-E-9】Self Control Valves (Pressure Reducing Type / Pressure Relief Type / Pressure Retaining Type) 13
9. Adjustment procedure for working pressure
- Tighten the lock nut securely. (Too weak a tightening torque on a lock nut may cause it to
loosen.)
- When the adjusting screw keeps being turned counterclockwise, it comes off. Therefore, handle
it within a range that it will not come off.
● Spanner wrench ● Allen wrench
Procedure
1) Detach the cap [l] from the top of the valve.
2) Loosen the lock nut [i] counterclockwise with a spanner wrench.
3) Turn the adjusting screw [j] with an Allen wrench.
Clock wise: The working pressure is increased.
Counterclockwise: The working pressure is decreased.
4) Set the adjusting screw [j] with an Allen wrench, and use spanner wrench to tighten the lock nut [i].
5) Re-attach the cap [l].
When the cap [l] touches the O-ring (D) [7], turn the cap [l] about 45˚ to closing degree.
Necessary items
Caution

Installation, Operation and Maintenance Manual
【H-V063-E-9】Self Control Valves (Pressure Reducing Type / Pressure Relief Type / Pressure Retaining Type)
14
10. Disassembling method for replacing parts
- When replacing valves and parts, completely eliminate pressure in the pipe.
- When conducting piping work, wear personal protective equipment
appropriate to the contents of work. (Failure to do so may cause an
injury.)
- When disassembling the valve, unlock the adjustment screw until the
compression spring is discharged. (You may be injured.)
- Do not take the pressure gauge apart.
Gauge contains a buffer fluid (between gauge and diaphragm)
which will leak if the gauge is disassembled.
- A socket wrench for disassembling the body part requires special jig (Optional item) according
to model and size. For details, please consult the nearest sales office.
● Safety goggles ● Protective gloves ● Spanner wrench
● Allen wrench ● Socket wrench ● special jig (Optional item)
Pressure Reducing Type (V182)
Disassembly Procedure
1) Remove the cap [l] from the top of the housing [b].
2) Loosen the lock nut [i] counterclockwise with a spanner wrench and the adjusting screw [j]
counterclockwise with an Allen wrench.
3) Loosen the bolt [o] and remove the body (bottom) [a1] and body (top) [a2] from the housing [b].
4) Remove the compression spring [h] and the spring plate [f].
5) Remove the piston base [e] counterclockwise from the piston [d].
6) Push up and remove the piston [d] form the bottom of the body (top) [a2]
Assembly procedure
Follow above steps in reverse to assemble valve. (Apply appropriate amounts of silicone grease to O-rings
before assembly.)
Necessary items
Gauge
Diaphragm
Warning
Caution
Caution

Installation, Operation and Maintenance Manual
【H-V063-E-9】Self Control Valves (Pressure Reducing Type / Pressure Relief Type / Pressure Retaining Type) 15
Pressure Reducing Type (V82)
Disassembly Procedure
1) Remove the cap [l] from the top of the housing [b].
2) Loosen the lock nut [i] counterclockwise with a spanner wrench and the adjusting screw [j]
counterclockwise with an Allen wrench.
3) Loosen the bolt [o] with the Allen wrench and remove the body (bottom) [a1] and body (top) [a2] from the
housing [b].
4) Remove the compression spring [h] and spring plate [f].
5) Loosen bolt [k] with the Allen wrench and remove the compressor [g] and diaphragm [c].
6) Pull out the piston [d] from the bottom of the body (top) [a2].
Assembly procedure
Follow above steps in reverse to assemble valve. (Apply appropriate amounts of silicone grease to O-rings
before assembly.)
Tightening torque of the bolts Unit: N-m {kgf-cm} [lb-inch]
Nominal size 15mm (½”) 20, 25mm (¾”, 1”) 32, 40mm (1¼”, 1½”) 50mm (2”)
Torque Value 9 {92} [80] 12 {122} [106] 15 {153} [133] 29 {296} [257]
Pressure Relief Type / Pressure Retaining Type (V185 / V186)
Disassembly Procedure
1) Remove the cap [l] from the top of the housing [b].
2) Loosen the lock nut [i] counterclockwise with a spanner wrench and the adjusting screw [j]
counterclockwise with an Allen wrench.
3) Remove the covering caps on bolt [o], and loosen bolt [o] counterclockwise with an Allen wrench.
4) Remove the compression spring [h] and spring plate [f].
5) Remove the diaphragm [c] from the body [a].
Assembly procedure
Follow above steps in reverse to assemble valve. (Apply appropriate amounts of silicone grease to O-rings
before assembly.)
Tightening torque of the bolts Unit: N-m {kgf-cm} [lb-inch]
Nominal size 15, 20mm (½”, ¾”) 25, 32mm (1”, 1¼”) 40、50mm (1½”, 2”)
Torque Value 9 {92} [80] 12 {122} [106] 20 {204} [177]
11. Inspection items
- Perform periodic maintenance. (Leakage may develop due to temperature changes or over
periods of prolonged storage, rest or operation.)
* Inspect the follow items
(1) Check for any flaw, cracks, or deformation on the outside of valve.
(2) Check for fluid leaking out of the body of the valve.
(3) Check the tightness of bolts, nuts, and lock nuts.
(4) Check the tightness of Union nuts.
(5) Check to ensure the adjusting screw operates smoothly.
Caution

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【H-V063-E-9】Self Control Valves (Pressure Reducing Type / Pressure Relief Type / Pressure Retaining Type) 16
12. Troubleshooting
Problem Cause Treatment
Fluid leaks from the body and the
housing.
The bolt [o] has loosened. Tighten up the bolt.
The diaphragm and/or O-ring (A, B) have
failed.
Replace the diaphragm
and/or O-ring.
Fluid leaks from the union nut.
The union nut is loosened. Tighten up the union nut.
The O-ring (C) has failed. Replace the O-ring with a
new one.
Fluid leaks from the adjusting bolt.
The diaphragm has failed. Replace the diaphragm with
a new one.
The O-ring (B) has failed. Replace the O-ring with a
new one.
The outlet pressure is below the
set value.
The piston base and/or the ring seal have
failed.
Replace the piston base
and/or ring seal with new
ones.
The diaphragm and/or weir have failed due
to abrasion or scratches.
Replace the parts or the
product.
- It is necessary to replace failed parts in order for the valve to perform properly. Refer to below parts list
for an explanation of available parts kits.
Type Parts Name Description
Pressure
Reducing
Type
V182
Adjustment Kits
Adjusting Screw [j], Spring Plate [f],
Compression Spring [h],
Spring Support Plate [p],
Piston [d] and Piston Base [e]
V82
Adjusting Screw [j], Spring Plate [f],
Compression Spring [h],
Piston [d] and O-ring (B) [n2]
V182
Sealing Kits
O-ring (A) [n1], O-ring (B) [n2],
Ring Seal [m]
V82 Diaphragm [c], O-ring (A) [n1],
Ring Seal [m]
Pressure Relief Type
Pressure Retaining Type *1 Spare Parts Sets Adjusting Screw [j], Diaphragm [c]
Compression Spring [h]
All Types *2
O-ring O-ring (C)[5]
End Connector /
Union Nut
End Connector [3], Union Nut [4],
Stop Ring [6] (Used for Flanged End.)
*1. Pressure Relief Type and Pressure Retaining Type use the same parts.
*2. The parts listed in this row are compatible with pressure reducing type, pressure relief type, and pressure
retaining type.
13. Handling of residual and waste materials
- Make sure to consult a waste treatment dealer for recommendations on the proper disposal of
plastic valves. (Poisonous gas is generated when the valve is burned improperly.)
Warning

Installation, Operation and Maintenance Manual
【H-V063-E-9】Self Control Valves (Pressure Reducing Type / Pressure Relief Type / Pressure Retaining Type)
Self Control Valves
Pressure Reducing Type / Pressure Relief Type / Pressure Retaining Type
15-50mm (½”-2”)
Information in this manual is subject to change without notice. April 2018
Distributor
http://www.asahi-yukizai.co.jp/en/