MODEL TA-18ML

AIR VENT VALVEPRODUCT MANUAL.

Thank you very much for choosing the Yoshitake’s product. To ensure the correct and safe use of theproduct, 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.

CautionThis symbol indicates a hazardous situation that, if not avoided, may result inminor 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········································· 45.1 Precaution before use ········································· 4-55.2 Precaution for use ················································ 55.3 Piping example ···················································· 55.4 Troubleshooting ··················································· 65.5 Disassemble ······················································· 6
6. Exploded view ··························································· 7
After Sales Service■EPDT-308■

1. Overview
TA-18ML Air vent valve is compact float type and discharge air automatically from piping. Body material ismade of stainless steel, offering high resistance to corrosion and durability. Mainly TA-18ML can be used forwater boiler and electrical hot water generator etc.

2. Specifications and Capacities
2 Specifications
Nominal size

6A

10A

15A

Application

Cold and hot water

Working pressure

0.01-0.3 MPa

Maximum temperature

100°C

Disc

FKM (fluororubber)

Float

Heat-resistance plastic

Guide

BrassInlet

JIS R1/8

JIS R3/8

JIS R1/2

JIS R3/4

Hose joint Φ6Outlet(Standard condition)

Connection

Stainless steel

Exhaust capacity L/min

Material

Body, cover

20A

Working pressure MPa

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3. Dimensions and Weights

NominalSize

DH

6A
10A
15A
20A

R 1/8
R 3/8
R 1/2
R 3/4

83878989(mm)AWeight(Width(kg)across flat)
0.12
0.13
32
0.13
32
0.13

2

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4. Operation
1.

After the installation, air exists in the product, and the float [10] is lowered by its own weight. In thiscondition, since the valve disc [6] is kept open by the lever [4], air is discharged outside by the internalpressure 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 isclosed 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.

StructureNo.
123456789101112131415

Parts nameBody
Cover
Spring tray
Lever
Hanger metal
Valve disc
GuideValve seat
SpringFloat
O RingO RingO RingStopper
Elbow cap

3

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5. Maintenance and Inspection
5.1 Precaution before useCaution
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 theproperty when valve leakage happens.

Elbow cap

Stopper
Pic. 1

2. Install the product to a place where check and handle can be done easily in aim of tightening theelbow cap when leakage happens.
*Leakage of liquid result in burns for high-temperature fluid or cause bodily injury or damage to theproperty 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 and20A, install the product by proper tool like wrench by hexagonal place on the body. And do nottighten 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 ofconnection and float vent etc.
Top of Stopper
9. When leakage of liquid happens because offoreign substance like dust on the valve disc andseat, 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. Aftertightening please clean valve seat and disc.
Stopper
Elbow cap

Pic. 24■EPDT-308■

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 stainlesssteel.
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 andenvironment, 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 ofconnection and float vent etc.
3. When leakage of liquid happens because of foreign substance like dust on the valve disc and seat, pleaseclean the valve disc and seat (see 5.4 Troubleshooting).
5.3 Piping example
Convector

Float ventBase board heater

Reliefvalve

Pressure
reducing valve

Air out
BoilerPump

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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5.4 Troubleshooting
TroubleCause
Water blowout
1. Foreign substances exist on thevalve disc and seat.
No air discharge

Remedy1. Remove the valve seat by spanner andclean the scale and dust. After cleaning,
fit the O ring (S9) into the ditch on thevalve seat and retighten it by spanner.
1. Install the valve on a place where air iseasy to accumulate.

1. Air accumulates too slowly.
2. Internal piping pressure is morethan the appropriate value.

2. Lower the internal piping pressure, orreplace the valve by one for highpressure.

5.5 Disassemble

Warning

1. Completely discharge internal pressure of the product, piping and equipment, andcool down the product prior to disassembling or maintenance in case ofhigh-temperature fluid.
*Failure to follow this notice may result in scalds or bodily injury due to residualpressure.

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.
2.
3.
4.

Stop heat resource (Boiler and hot water generator etc.) and pump.
Discharge internal pressure in the piping.
Remove the valve seat by spanner (12mm). (Pic.3)
Remove the valve seat by spanner and clean the scale and dust. (Pic. 4)

O Ring (S9）Valve
SeatElbow cap
Valve
Seat
Pic. 3

Valve discPic. 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.

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6. Exploded View
* Because elbow cap is made of plastic, it’s consumable parts.

Elbow cap

Cap stopper

Valve Seat

O RingValve discGuideBody7■EPDT-308■