Yoshitake TA-18ML User manual

EPDT-308a
MODEL TA-18ML
AIR VENT VALVE
PRODUCT MANUAL .
Thank you very much for choosing the Yoshitake’s product. To ensure the correct and safe use of the
product, please read this manual before use. This manual shall be kept with care for future references.
The symbols used in this manual have the following meanings.
Warning
This symbol indicates a potentially hazardous situation that, if not avoided,
could result in death or serious injury.
Caution
This symbol indicates a hazardous situation that, if not avoided, may result in
minor or moderate injury or may result in only property damage.
Table of Contents
1. Specifications and Capacities ·······································1
2. Dimension and weight·················································2
3. Operational description ···············································3
4. Installation
4.1 Piping example····················································4
4.2 Warning and Caution before use···························4-5
5. Operation
5.1 Warning and Caution for use ··································6
6. Maintenance
6.1 Warning and Caution for maintenance and inspection ··6
6.2 Daily and Periodic inspection··································7
6.3 Troubleshooting···················································8
6.4 Disassembly ·······················································8
6.5 Exploded view·····················································9
After Sales Service

1 EPDT-308a
1. Specifications and Capacities
Nominal size
6A
10A
15A
20A
Application
Cold and hot water
Working pressure
0.01-0.3 MPa
Maximum temperature
100°C
Material
Body,cover
Stainless steel
Disc
FKM (fluororubber)
Float
Heat-resistance plastic
Guide
Brass
Connection
Inlet
JIS R1/8
JIS R3/8
JIS R1/2
JIS R3/4
Outlet
Hose joint Φ6
Caution
Please confirm that the indications on the product correspond with the
specifications of the ordered product model before use.
* If they are different, please contact us without using the product.
Working pressure MPa
Exhaust capacity L/min
(Standard condition)

2 EPDT-308a
2. Dimensions and Weights
(mm)
Nominal
Size
D
H
A
(Width
across flat)
Weight
(kg)
6A
R 1/8
83
-
0.12
10A
R 3/8
87
-
0.13
15A
R 1/2
89
32
0.13
20A
R 3/4
89
32
0.13
label

3 EPDT-308a
3. Operational description
1. After the installation, air exists in the product, and the float [10] is lowered by its own weight. In this
condition, since the valve disc [6] is kept open by the lever [4], air is discharged outside by the internal
pressure of the system.
2. When air is discharged, hot or cold water flows into the product to make the float come up on
buoyancy and the force that keeps the valve disc open through the lever is lost. Then the valve disc is
closed by the spring [9] and pressure to the valve disc.
3. When air bubbles are generated in the system and collected into the product, the inside water level
drops, and the float loses buoyancy and opens the valve disc to discharge air.
4. Repeating the processes 2. and 3., air in the system can be removed.
Structure
No.
Parts name
1
Body
2
Cover
3
Spring tray
4
Lever
5
Hanger metal
6
Valve disc
7
Guide
8
Valve seat
9
Spring
10
Float
11
O Ring
12
O Ring
13
O Ring
14
Stopper
15
Elbow cap

4 EPDT-308a
Pressure
reducing valve
Boiler
Relief
valve
Float vent
Air out
Pump
Convector
Base board heater
4. Installation
4.1 Piping example
Using this product as a combination withAir Out (Air separator from water) typeAO-2, it make efficiency of
air discharge higher.
4.2 Warning and Caution before use
Warning
1. Make sure that end of piping or tube of the product outlet make space of 50mm over from the flood
level rim of the vent.
* Failure to follow this notice may contaminate the surroundings, result in burns for high-temperature
fluid or cause bodily injury or damage to the property when valve leakage happens.
2. Make sure to attach joint and hose to outlet of the product, and lead them to drain ditch.
Do not remove the top of the cap stopper [Pic. 2] when operation.
*Fluid leaks because foreign substance exist on valve disc and seat when elbow cap is loosen,
leakage of liquid to outside from elbow cap may happen. Do not use the product around the place
where leaked liquid can wet another equipment.
*Leakage of liquid result in burns for high-temperature fluid or cause bodily injury or damage to the
property when valve leakage happens.
Pic. 1 Pic. 2
Stopper
Elbow cap
Elbow cap
Stopper
Top of
Stopper

5 EPDT-308a
Caution
1. Install the product to a place where check and handle can be done easily in aim of tightening the
elbow cap when leakage happens.
*Leakage of liquid result in burns for high-temperature fluid or cause bodily injury or damage to the
property when valve leakage happens.
2. Install the product vertically to a place where air is easy to accumulate.
*Failure to follow this notice may prevent the product from functioning properly.
3. Before installing the product, remove foreign substance and scale（seal material ect.)from the piping.
*Failure to follow this notice may prevent the product from functioning properly.
4. As for nominal size 6A and 10A, tighten the product by hand into piping. As for nominal size 15A and
20A, install the product by proper tool like wrench by hexagonal place on the body. And do not tighten
the product excessively.
Do not tighten more than necessary(15A：35N・m20A：50 N・m).
*Failure to follow this notice may cause deformation of the body and malfunction.
5. Install the product to a place where maintenance and inspection easily.
Prevent the product from excess of the pressure e.g. water hammer.
6. When test operation for hot water generator, check there is no leakage by means of inspection of
connection and float vent etc.
7. When leakage of liquid happens because of foreign substance like dust on the valve disc and seat,
please clean the valve seat (see 6.3 Troubleshooting). As immediate action, remove top pf the cap and
tighten the elbow cap to stop the leakage. (Pic.2)
Tighten the elbow cap after removing hose.After tightening please clean valve seat and disc.
Because elbow cap is made of plastic, it’s consumable parts.
The elbow cap will be damaged if it is tightened with excessive force(Tightening torque：0.5 N・m more).
8. Install the product vertically(tolerance angle 5°) to a place where air is easy to accumulate.
* Failure to follow this notice may prevent the product from functioning properly.
9. If there is a possibility of freezing or the product is not used for an extended period,completely
discharge fluid from the product and pipes, and close the stop valve.
* Failure to follow this notice may cause malfunction of the product due to rusting inside the product and
the pipes or damaged by freezing.
10. If the piping is under negative pressure, it draw in outside air.
11. Install a stop valve(valve cock or gate valve) at the inlet of the air vent valve for maintenance and
inspection.
12. At brass parts, corrosion can be generated depending on the water quality and it cause malfunction.
For the place where corrosion can be expected, select the product made of suitable material like
stainless steel.
13. In case ingredient giving negative influence to internal parts is contained in the liquid and environment,
deterioration of internal parts can be speeded and it cause leakage and malfunction.
14. In case liquid is accumulated in the product for long-term, moving parts can be sticky and cause
malfunction.
15. Nominal size selection chart shows reference value. Suitable size differ according to piping and
environment, so around 20% safety factor is necessary for the selection of the size.
16. To avoid potential difference, do to connection different metal parts otherwise corrosion product or parts
can happen.

6 EPDT-308a
5. Operation
5.1 Warning and Caution for use
Warning
Do not touch the product with bare hands in case of high-temperature fluid.
*Failure to follow this notice may result in burns.
Caution
1. Follow the designated working pressure and Max. temperature.
*Failure to follow this may result in malfunction.
2. If there is a possibility of freezing or the product is not used for an extended period,completely
discharge fluid from the product and pipes, and close the stop valve.
* Failure to follow this notice may cause malfunction of the product due to rusting inside the product
and the pipes or damaged by freezing.
3. A small amount of water may blow out with air at air discharge for initial operation.
* This is not a failure of the product.
4. If the piping is under negative pressure, it draw in outside air.
5. When test operation for hot water generator, check there is no leakage by means of inspection of
connection and float vent etc.
6. When leakage of liquid happens because of foreign substance like dust on the valve disc and seat,
please clean the valve disc and seat (see 6.4 Troubleshooting).
6. Maintenance
6.1 Warning and Caution for maintenance and inspection
Warning
1. Completely discharge internal pressure of the product, piping and equipment, and
cool down the product prior to disassembling or maintenance in case of
high-temperature fluid.
*Failure to follow this notice may result in scalds or bodily injury due to residual
pressure.
Caution
1. To maintain function and performance, do regular inspection.
*If any problem, please contact well-trained agent.
2. Disassemble must be done by well-trained agent or manufacture.
3. After long-term stop of operation, please inspect operation.
*If any problem, please contact well-trained agent.

7 EPDT-308a
6.2 Daily and Periodic inspection
Please carry out daily and periodic inspections to maintain product functionality and performance.
●Daily inspection（1time/day）
item
How to inspect
actions to be taken
Working state
Make sure the air is
venting.（However, the
valve is closed when
there is no air inside.）
See 6.3Troubleshooting.
Valve seat leakage
Please check visually.
See 6.3Troubleshooting.
external leakage
Please check visually.
See 6.3Troubleshooting.
●Periodic inspection（1time/year）
item
How to inspect
actions to be taken
Valve Disc
Disassemble and check
visually.
If scale such as dust to the Valve Disc, clean it.
If there is any damage, replace the valve set.
Valve seat
O ring
Disassemble and check
visually.
If scale such as dust to the Valve seat, clean it.
If there is any damage, please replace the product.
If the O ring is damaged, replace it.
●Recommended replacement year
Body(Internal parts),Cover,Guide,Valve disc cannot be disassembled.
It is recommended to replace the product every 3 to 5 years after conducting Daily and Periodic
inspection.

8 EPDT-308a
6.3 Troubleshooting
Trouble
Cause
Remedy
No air discharge
1. It is difficult for air to accumulate.
1. Install it in a place where air tends to
accumulate.
2. Internal piping pressure is more than
the appropriate value.
2. Lower the internal piping pressure, or
replace the valve by one for high
pressure.
3. Top of cap stopper comes off.
3. Put the cap stopper. [See 4.2 Pic.1,2]
Valve seat
leakage.
1. Foreign substances exist on the valve
disc and seat.
1. Remove and clean the valve disc
and seat. [See 6.4 Disassemble]
External leakage
1. Damage or deformation of the body
or cover due to abnormal pressure
rise.
1. Replace the product.
2. O ring is damaged.
2. Replace the O ring.
6.4 Disassemble
1. Stop heat resource (Boiler and hot water generator etc.) and pump.
2. Discharge internal pressure in the piping.
3. Remove the valve seat by spanner (12mm). (Pic.3)
4. Remove the valve seat by spanner and clean the scale and dust. (Pic. 4)
Pic. 3 Pic. 4
5. After cleaning, fit the O ring (S9) into the ditch on the valve seat and retighten it by spanner. (Torque:
Approx. 3N・m). O Ring and elbow cap are consumable parts.
Valve
Seat
O Ring (S9）
Valve disc
Valve
Seat
Elbow cap

9 EPDT-308a
6.5Exploded view
Parts marked with an asterisk (*) are consumable parts.
Caution
Cover cannot be removed.
*If removed, the function and performance of the product cannot be maintained.
Elbow cap*
Valve Seat
Valve disc
O Ring*
Cap stopper*
Body
Guide
Cover

2015.8
PDD-046e
Warranty Information
1. Limited warranty
This product has been manufactured using highly-advanced techniques and subjected to
strict quality control. Please be sure to use the product in accordance with instructions on
the manual and the label attached to it.
Yoshitake warrants the product to be free from any defects in material and workmanship
under normal usage for a period of one year from the date of receipt by the original user, but
no longer than 24 months from the date of shipment from Yoshitake’s factory.
2. Parts supply after product discontinuation
This product may be subject to discontinuation or change for improvement without any prior
notice. After the discontinuation of the product, Yoshitake supplies the repair parts for 5
years otherwise individually agreed.
3. This warranty does not cover the damage due to any of below:
(1) Valve seat leakage or malfunction caused by foreign substances inside piping.
(2) Improper handling or misuse.
(3) Improper supply conditions such as abnormal water pressure/quality.
(4) Water scale or freezing.
(5) Trouble with power/air supply.
(6) Any alteration made by other than Yoshitake.
(7) Use under severe conditions deviating from the design specifications
( e.g. in case of corrosion due to outdoor use).
(8) Fire, flood, earthquake, thunder and other natural disasters.
(9) Consumable parts such as O-ring, gasket, diaphragm and etc.
Yoshitake is not liable for any damage or loss caused by malfunction or defect of the product.
INTERNATIONAL DEPT.
955-5, Miyamae, Irukadeshinden, Komaki, Aichi, 485-0084, Japan
Phone: [phone] Fax: [phone]
E-mail: [e-mail]