MODEL TA-22ML

FLOAT 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. Usage of the product ·················································· 1
2. Specifications and Capacities ······································· 1
3. Dimensions and Weights ············································· 3
4. Operation ································································· 4
5. Maintenance and Inspection ········································ 55.1 Precaution before use ··········································· 55.2 Precaution for use ················································ 65.3 Piping example ···················································· 65.4 Troubleshooting ··················································· 75.5 Precaution for maintenance ···································· 76. Exploded view ··························································· 8■EPDT-273■

1. Usage of the productFloat vent valve removes air inside piping and prevents decrease of heat efficiency, noise production orcorrosion of equipment piping by commingling of air, etc.
TA-22ML float vent is compact float type, discharges air automatically without any manual operation.

2. Specifications and Capacities
Nominal size

15-25A

Application

Cold and hot water

Working pressure

0.01-1.0 MPa

Maximum temperature

100°C

Body, coverBronze

DiscSynthetic rubber

Float

High temperature resin

Inlet

JIS R screwed

OutletHose fitting (Φ6)

MaterialConnection

CoatingCaution

Nickel coating

Please confirm that the indications on the product correspond with the specificationsof the ordered product model before use.
* If they are different, do not use the product and contact us.

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(Standard condition)

Exhaust capacity L/min

Exhaust capacity chart

Working pressure MPa

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3. Dimensions and Weights(mm)SizeｄＤA15A R 1/2
20A R 3/4
25A R 11318232328
35

Weight(kg)95.5 0.36
1010.41040.46
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4. Operation
1.

After installation, air exists in the product, and float [11] is lowered by its own weight. In this condition,
since valve [8] is kept open by lever [7], air is discharged outside by internal pressure of the system.

2.

When air is discharged, hot or cold water flows into the product to make float [11] come up onbuoyancy and force that keeps valve [8] open through lever [7] is lost. Then valve [8] is closed byspring [9] and pressure to valve [8].

3.

When air bubbles are generated in the system and collected into the product, water level inside theproduct drops, and float loses buoyancy and opens valve [8] to discharge air.

4.

Then the operation goes back to the above process 2. Repeating the processes 2 and 3, air in thesystem can be removed.

Structural view

No.
1
2
3
4
5
6
7
8
910
11
12
13
14

Parts name
Body
Cover
Guide
Hanger metal
Valve seat
O ringLeverValve
SpringSpring tray
Float
Elbow cap
O ringStopper4■EPDT-273■

5. Maintenance and inspection
5.1 Precaution before use

Caution
1. After tightening elbow cap, be sure to attach hose to the product, and lead it to drain ditch (see Fig.
1). In addition, after attaching hose, fix the hose to avoid loosening of elbow cap.
* When foreign substance such as dust adheres to valve with elbow cap loosened and valve leakage
occurs, water may leak from around elbow cap to outside. Do not use the product for a place whereother devices can get wet by water when water leakage occurs.
* Valve leakage may lead to contaminate surroundings, scald if fluid is high-temperature, or damage
to body or property.

StopperElbow cap

Fig. 1
2. Install the product to a place where confirmation and support can be conducted to tighten elbow cap
when valve leakage occurs.
* Valve leakage may lead to contaminate surroundings, scald if fluid is high-temperature, or damage
to body or property.
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, be sure to remove foreign substances and scale from the piping.
* Commingling of foreign substance or scale into the product prevents the product from functioning
properly.
5. To install the product to piping, tighten hexagonal part of the product with tools such as wrench.
Avoid overtightening.
* Failure to follow this notice deforms body of the product or leads to prevent functioning properly.
6. Install the product to a place where maintenance and inspection can be conducted easily.
7. Install the product to a place cannot be applied to abnormal high pressure by water hammer, etc.
8. On test operation of water heater, conduct inspection for connection part of float vent, and check that there
is no leakage.
9. When on operation foreign substance such as dust adheres to valve and valve leakage occurs, clean thevalve (see 5.4 Troubleshooting). As an emergency treatment, remove the head of stopper and tighten
elbow cap. Water leakage can be stopped (see Fig.2). Also, when tightening elbow cap, tighten it after
removing hose. After tightening, clean the valve.

StopperElbow cap

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10. Since elbow cap is made of resin, it is treated as consumable supply.
11. For brass parts, corrosion is generated or accelerated by water quality, and leads to malfunction of theproduct. For surroundings where corrosion can be generated, please select the product with enduring parts
such as stainless steel material.
12. If component having negative effect on inner parts is included in fluid and surroundings, deterioration ofrubber parts is accelerated and causes outside leakage and functional disorder.
13. Keeping fluid in the product for a long term fixes sliding parts and leads to malfunction of the product14. Performance value of Nominal Size Selection Chart is referential value. Since it can change according topiping condition and usage environment, secure safety factor of 20% or more for performance value whenselection.
15. Do not make dissimilar metal piping which causes difference of electrical potential. If not, the product andparts are corroded.

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. Do not use the product over working pressure range or over maximum working temperature.
*Failure to follow this notice damages the product or leads to air exhaust defect.
2. On test operation of water heater, conduct inspection for connection part of float vent, and check that
there is no leakage.
3. When on operation foreign substance such as dust adheres to valve and valve leakage occurs, clean thevalve (see 5.4 Troubleshooting).
5.3 Piping example

Convector
Float ventHome boiler
relief valve

Base board heater

Air out

PRV for waterBoiler

Circulation pump
If using the product with AO-2 air out (air separator), higher performancecan be obtained.

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5.4 Troubleshooting
TroubleCause
Water leakage
1. Foreign substance such as dustoccurs
adheres to valve and valve seat.

Air is not discharged

1. Air accumulation is bad.

Remedy1. By removing valve seat part with spanner,
seal surface of valve and valve seat can becleaned. Clean off scale and dust adhering
to valve and valve seat with waste cloth,
and after cleaning, apply O ring (S9) to ditchof valve seat and screw it, then tighten itwith spanner.
1. Install the product to a place where air iseasy to accumulate.

2. Pressure inside piping is morethan appropriate pressure.

2. Decrease pressure inside piping. Or,replace with piping for high pressure.

5.5 Precaution for maintenanceWarning

Completely discharge internal pressure of the product, piping and equipment. 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 residualpressure.

Caution
1. Conduct daily inspection and regular inspection to maintain function and performance of the product.
* If defect is found, ask professionals.
2. Disassembly and inspection shall be performed by an experienced professional or valve
manufacturer.
3. When the product is not used for an extended period, conduct operational check before operation.
* If defect is found, ask professionals.

1.
2.
3.
4.

Stop driving of heat source (hot water boiler, electrical water heater, etc) and pump.
Remove pressure inside piping.
Remove valve seat with spanner (nominal size: 12mm) (see Fig.3).
By removing valve seat, seal surface of valve and valve seat can be cleaned. Clean off scale and dust
adhering to valve and valve seat with waste cloth. (see Fig. 4)
Elbow cap
ValveO ring

Valve seat
Valve seatFig.3Fig. 4

5. After cleaning, apply O ring (S9) to ditch of valve seat and screw it, then tighten it with spanner. O ring andelbow cap are treated as consumable supply (Tightening torque: approximately 3 N・m).

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6. Exploded View
*Elbow cap is made of resin, it is treated as consumable supply.

Elbow cap

Stopper

Valve seat

O ringValve

Guide

Body

8

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