Yoshitake TA-22ML User manual

■EPDT-273■
MODEL TA-22ML
FLOAT 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. Usage of the product ·················································· 1
2. Specifications and Capacities······································· 1
3. Dimensions and Weights············································· 3
4. Operation································································· 4
5. Maintenance and Inspection ········································ 5
5.1 Precaution before use··········································· 5
5.2 Precaution for use················································ 6
5.3 Piping example···················································· 6
5.4 Troubleshooting··················································· 7
5.5 Precaution for maintenance···································· 7
6. Exploded view··························································· 8

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1. Usage of the product
Float vent valve removes air inside piping and prevents decrease of heat efficiency, noise production or
corrosion 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
Material
Body,cover Bronze
Disc Synthetic rubber
Float High temperature resin
Connection
Inlet JIS R screwed
Outlet Hose fitting (Φ6)
Coating Nickel coating
Caution
Please confirm that the indications on the product correspond with the specifications
of the ordered product model before use.
* If they are different, do not use the product and contact us.

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Exhaust capacity chart
Exhaust capacity L/min
(Standard condition)
Working pressure MPa

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3. Dimensions and Weights
(mm)
Weight
(kg)
15A
R 1/2
13
23
95.5
0.36
20A
R 3/4
18
28
101
0.4
25A
R 1
23
35
104
0.46
A HSize ｄ Ｄ

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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 on
buoyancy and force that keeps valve [8] open through lever [7] is lost. Then valve [8] is closed by
spring [9] and pressure to valve [8].
3. When air bubbles are generated in the system and collected into the product, water level inside the
product 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 the
system can be removed.
Structural view
No.
Parts name
1 Body
2 Cover
3 Guide
4 Hanger metal
5 Valve seat
6 O ring
7 Lever
8 Valve
9 Spring
10 Spring tray
11 Float
12 Elbow cap
13 O ring
14 Stopper

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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 where
other 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.
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 the
valve (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.
Stopper Elbow cap
Elbow capStopper

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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 the
product. 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 of
rubber 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 product
14. Performance value of Nominal Size Selection Chart is referential value. Since it can change according to
piping condition and usage environment, secure safety factor of 20% or more for performance value when
selection.
15. Do not make dissimilar metal piping which causes difference of electrical potential. If not, the product and
parts 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 the
valve (see 5.4 Troubleshooting).
5.3 Piping example
If using the product with AO-2 air out (air separator), higher performance
can be obtained.
PRV for water
Fl
oat vent
Convector
B
ase
board heater
Air out
Circulation pump
Home boiler
relief valve
Boiler

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5.4 Troubleshooting
Trouble Cause Remedy
Water leakage
occurs
1.
Foreign substance such as dust
adheres to valve and valve seat.
1.
By removing valve seat part with spanner,
sealsurface of valve and valve seat can be
cleaned. Clean off scale and dust adhering
to valve and valve seat with waste cloth,
and after cleaning, apply O ring (S9) to ditch
of valve seat and screw it, then tighten it
with spanner.
Air is not discharged
1.
Air accumulat
ion is
bad.
1.
Install the product to a place where air is
easy to accumulate.
2.
Pressure inside piping is more
than appropriate pressure.
2.
Decrease pressure inside piping. Or,
replace with piping for high pressure.
5.5 Precaution for maintenance
Warning
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 residual
pressure.
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. Stop driving of heat source (hot water boiler, electrical water heater, etc) and pump.
2. Remove pressure inside piping.
3. Remove valve seat with spanner (nominal size: 12mm) (see Fig.3).
4. 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)
Fig.3 Fig. 4
5. After cleaning, apply O ring (S9) to ditch of valve seat and screw it, then tighten it with spanner. O ring and
elbow cap are treated as consumable supply (Tightening torque: approximately 3 N・m).
Valve O ring
Valve seat
Valve seat
Elbow cap

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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 ring
Valve
Guide
Body