Yoshitake TA-16 Series Manuale utente

■EPDT-30a■

MODEL TA-16 Series

TA-16, TA-16L, TA-16CVA and TA-16CVS

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

1.1 Specifications······················································ 1

1.2 Exhaust capacity chart ·········································· 1

2. Dimensions and Weights···········································2-3

3. Operational description ··············································· 4

4. Installation

4.1 Piping example···················································· 5

4.2 Warning and Caution before use ····························· 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 Periodic replacement ············································ 8

6.4 Troubleshooting··················································· 8

6.5 Exploded view····················································· 9

7. Optional parts

7.1 Optional parts·····················································10

7.2 Dimensions of optional parts ·································10

7.3 Combination of the product and optional parts···········11

After Sales Service

1 ■EPDT-30a■

1. Specifications and Capacities

1.1 Specifications

Model

TA-16

TA-16L

TA-16CVA

TA-16CVS

Nominal size

15-25A

Application

Cold and hot water

Working pressure

0.01-1.0 MPa

Check valve

Provided

Maximum temperature

90°C

Material

Body,cover,

float

Stainless steel

Valvedisc,

gasket

FKM (fluororubber)

L-shaped

hosejoint

Brass

Check valve

joint (check

valve)

FKM (fluororubber)

Connection

Inlet

JIS R screwed

Outlet

JIS Rc 1/4

screwed

Φ6 (hose inside

diameter)

JIS Rc 1/4 screwed

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.

1.2 Exhaust capacity chart

Working pressure MPa

Exhaust capacity L/min

(Standard condition)

2 ■EPDT-30a■

2. Dimensions and Weights

■ TA-16

Nominal

size

Weight

(kg)

15A

R 1/2

118

0.66

20A

R 3/4

120

0.68

25A

R 1

124.5

0.74

■ TA-16L

Nominal

size

Weight

(kg)

15A

R 1/2

136

143

0.70

20A

R 3/4

138

145

0.72

25A

R 1

142.5

149.5

0.78

（hose inside diameter）

3 ■EPDT-30a■

■ TA-16CVA

Nominal

size

Weight

(kg)

15A

R 1/2

135.5

146

0.72

20A

R 3/4

137.5

148

0.74

25A

R 1

142

152.5

0.80

■ TA-16CVS

Nominal

size

Weight

(kg)

15A

R 1/2

142

0.70

20A

R 3/4

144

0.72

25A

R 1

148.5

0.78

4 ■EPDT-30a■

3. Operational description

1. After the installation, air exists in the product, and the float [9] is lowered by its own weight. In this

condition, since the valve disc [5] is kept open by the lever [7], 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 [9] come up on

buoyancy and the force that keeps the valve disc [5] open through the lever [7] is lost. Then the valve

disc [5] is closed by the spring [6] and pressure to the valve disc [5].

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 [5] 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.

No.

Main parts

Body

Cover

Seat (Exhaust outlet)

Hanger Metal

Valve Disc

Spring

Lever

Nut

Float

Gasket

Bolt

label

The above drawing shows the structure of the TA-16. The TA-16L has L-shaped hose joint screwed in the

seat [3]. The TA-16CVA and TA-16CVS have check valve joints (the CV-16A and CV-16S respectively)

screwed in each seat [3].

5 ■EPDT-30a■

4. Installation

4.1 Piping example

4.2 Warning and Caution before use

Warning

1. Make sure to attach joint and hose to outlet of the product, and lead them to drain ditch.

* 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 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.

Caution

1. 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.

2. Before installing the product, remove foreign substances and scale（seal material ect.)from the

piping.

* Failure to follow this notice may prevent the product from functioning properly.

3. Install stop valve (cock or gate valve) to inlet of the product for maintenance and inspection.

4. Plumb the exhaust outlet in a way that prevents backflow.

Stop valve

To drain ditch

The drawing on the left shows a piping example of the TA-16.

6 ■EPDT-30a■

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. A small amount of water may blow out with air at air discharge for initial

operation.

* This is not a failure of the product.

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. If the piping is under negative pressure, it draw in outside air（TA-16,16L）.

6. Maintenance

6.1 Precaution for maintenance

Warning

Disassembling and inspections shall be performed by a professional or a valve

manufacturer.

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.

7 ■EPDT-30a■

6.2 Daily inspection・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 6.4 Troubleshooting.

Valve seat leakage

Please check visually.

See 6.4 Troubleshooting.

external leakage

Please check visually.

See 6.4 Troubleshooting.

●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

Gasket

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 gasket is damaged, replace it.

Float

Disassemble and check

visually.

If the float is damaged or deformed, replace the float.

8 ■EPDT-30a■

6.3 Periodic replacement

Synthetic rubber is a consumable part. The replacement interval of the synthetic rubber part greatly varies

depending on the use conditions. The general guide for the replacement interval is shown below.

Recommended

replacement

year

Part name

3 years

Valve Disc [5] *

5 years

Gasket [10]

Parts marked with an asterisk (*) are replaced as a set of valve discs.

6.4 Troubleshooting

Trouble

Cause

Remedy

No air discharge

1. The stop valve on inlet side of the

product is kept closed.

1. Open the stop valve fully.

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. Air accumulates too slowly.

3. Install the valve on a place where air is

easy to accumulate.

Water blowout from

Exhaust outlet

1. Foreign substances exist on the

valve disc [5] and seat [3].

1. Remove and clean the valve disc [5] and

seat [3].

2. The float [9] is damaged and

cannot work properly.

2. Replace the float [9].

external leakage

1. Damage or deformation of the

body or cover due to abnormal

pressure rise.

1. Replace the product.

2. Gasket[10] is damaged.

2. Replace the gasket [10].

Sucking in air outside

(the TA-16CVA and

TA-16CVS)

1. Foreign substances exist on the

check valve.

1. Remove foreign substances.

9 ■EPDT-30a■

6.5 Exploded view

Caution for assembly

Bolt

Washer

Cover

Seat

Hanger

metal

Valve disc

Valve cover

Spring

Lever

Nut

Fook

Float

Gasket*

Body

Integral structure

Integral

structure

Integral

structure

The above drawing shows the structure of the TA-16. The

TA-16L has L-shaped hose joint screwed in the seat [3].

The TA-16CVA and TA-16CVS have check valve joints

(the CV-16A and CV-16S respectively) screwed in each

seat [3].

Parts marked with an asterisk (*) are consumable parts.

Parts marked with an asterisk

(*) are consumable parts.

To attach the cover [2] to the body [1], place the body

[1] from the above on the cover [2].

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