Yoshitake TA-18ML User manual

■EPDT-308■
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. Overview·································································· 1
2. Specifications and Capacities······································· 1
3. Dimension and weight ··············································· 2
4. Operation ······························································· 3
5. Maintenance and Inspection········································· 4
5.1 Precaution before use·········································4-5
5.2 Precaution for use················································ 5
5.3 Piping example···················································· 5
5.4 Troubleshooting··················································· 6
5.5 Disassemble······················································· 6
6. Exploded view··························································· 7
After Sales Service

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■EPDT-308■
1. Overview
TA-18ML Air vent valve is compact float type and discharge air automatically from piping. Body material is
made of stainless steel, offering high resistance to corrosion and durability. Mainly TA-18ML can be used for
water boiler and electrical hot water generator etc.
2. Specifications and Capacities
2 Specifications
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
Working pressure MPa
Exhaust capacity L/min
(Standard condition)

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3. 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

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■EPDT-308■
4. Operation
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

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5. Maintenance and Inspection
5.1 Precaution before use
Caution
1. 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
2. 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.
3. 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.
4. Before installing the product, remove foreign substance and scale from the piping.
*Failure to follow this notice may prevent the product from functioning properly.
5. 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.
*Failure to follow this notice may cause deformation of the body and malfunction.
6. Install the product to a place where maintenance and inspection easily.
7. Prevent the product from excess of the pressure e.g. water hammer.
8. When test operation for hot water generator, check there is no leakage by means of inspection of
connection and float vent etc.
9. When leakage of liquid happens because of
foreign substance like dust on the valve disc and
seat, please clean the valve seat (see 5.4
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.
Pic. 2
Stopper Elbow cap
Elbow cap
Stopper
Top of Stopper

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■EPDT-308■
Pressure
reducing valve
Boiler
Relief
valve
Float vent
Air out
Pump
Convector
Base board heater
10. Because elbow cap is made of plastic, it’s consumable parts.
11. 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.
12. 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.
13. In case liquid is accumulated in the product for long-term, moving parts can be sticky and cause
malfunction.
14. 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.
15. To avoid potential difference, do to connection different metal parts otherwise corrosion product or parts
can happen.
5.2 Precaution 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. When test operation for hot water generator, check there is no leakage by means of inspection of
connection and float vent etc.
3. 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 5.4 Troubleshooting).
5.3 Piping example
Using this product as a combination with Air Out (Air separator from water) type AO-2, it make efficiency of
air discharge higher.

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■EPDT-308■
5.4 Troubleshooting
Trouble Cause Remedy
W
ater blowout
1.
Foreign substances exist on the
valve disc and seat.
1.
R
emove
the valve seat
by spanner
and
clean the scale and dust.After cleaning,
fit the O ring (S9) into the ditch on the
valve seat and retighten it by spanner.
No air discharge
1.
A
ir accumulates too slowly.
1.
Install the valve on a place where air is
easy to accumulate.
2.
I
nternal piping pressure is more
than the appropriate value.
2.
Lower the internal piping pressure, or
replace the valve by one for high
pressure.
5.5 Disassemble
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.
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

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6. Exploded View
* Because elbow cap is made of plastic, it’s consumable parts.
Elbow cap
Valve Seat
Valve disc
O Ring
Cap stopper
Body
Guide