Yoshitake TA-2 Air Vent Valve is essential for air conditioning and plumbing systems. Ingress of air into the piping system causes a decrease in heat efficiency, noise generation, or corrosion of devices. The TA-2 series is equipped with a quick exhaust mechanism that greatly reduces the time required for water supply by exhausting a large amount of air inside the piping at the time of initial water supply more quickly than conventional air vent valves.

Applications

Building equipment, industrial equipment, and building complexes.

Features

• Equipped with a quick exhaust mechanism, air inside piping can be quickly discharged at the time of initial water supply, ensuring smooth water supply.
• Wide pressure range compared to conventional air vent valves and applicable from low pressure to high.
• Parts are easy to replace, maintain, and inspect from the outside even if the valve seat surface is damaged during long-period operation.
• No leakage from the valve because synthetic rubber is used for the valve seat.
• The body of the TA-2 is electrodeposition-coated for rustproofing.
• TA-2C has superior corrosion resistance since the inside and outside of its body are coated with Nylon 11.
• The bodies of TA-5 and TA-5F are made of bronze, keeping these models free from rusty water.

Specifications and Performance

Model	TA-2 / TA-2C	TA-5 / TA-5F
Application	Cold and hot water, Oil (specific gravity: 0.8 or more)	Cold and hot water, Oil (specific gravity: 0.8 or more)
Working pressure	0.01 - 1.0 MPa	0.01 - 1.0 MPa
Operating pressure range of quick exhaust valve	0.01 MPa or less	0.01 MPa or less
Maximum temperature	90°C (TA-2) / 60°C (TA-2C)	90°C (TA-5) / 120°C (TA-5F)
Body	Ductile cast iron	Bronze
Cover	Bronze	Bronze
Valve	Brass	Brass
Floating valve	Brass (Equipped with NBR disc)	Brass (TA-5: NBR disc / TA-5F: FKM disc)
Float	Stainless steel	Stainless steel
Connection	JIS Rc screwed	JIS Rc screwed

Note

• Body is electro-deposition coated for rust prevention (TA-2).
• Maximum temperature for intermittent usage is 90°C (TA-2C).
• Insulation should be applied when the temperature difference between the product and the outside atmosphere is 40°C or more (TA-2C).

Dimensions and Weights

Nominal size	d	d1	H	C	Weight (kg)*
15A	Rc 1/2	Rc 3/8	153	114	3.18
20A	Rc 3/4	Rc 3/8	153	114	3.18
25A	Rc 1	Rc 3/8	157	114	3.22
32A	Rc 1-1/4	Rc 3/8	157	114	3.22

*The weight is for TA-2 and TA-2C.

Exhaust Capacity

Operation

1. Before water flowing: The float [7] is in the low position and the floating valve [2] is opened.
2. During water flowing: When water starts to flow into the valve, air inside the piping is pushed by the water and exhausted out through the quick exhaust hole.
3. Water flowing is completed: The float [7] is pushed up by water flowing into the product, and the valve [3] connected with the float is closed.
4. Air inflow: When air flows into the product, the float [7] is lowered immediately, and at the same time the valve [3] is lowered, therefore air is exhausted out through the quick air vent hole.

Structure

No.	Parts name
1	Valve seat
2	Floating valve
3	Valve
4	Valve guide
5	Hanger
6	Cover
7	Float
8	Body

Precautions for Operation and Installation

Caution

1. Install the product perpendicularly in a place where air likely gathers. Failure to follow this notice will prevent the product from achieving its function.
2. Before installing the product, remove foreign substances and scale from the piping. Failure to follow this notice may prevent the product from functioning properly due to the ingress of foreign substances.
3. When installing the product to piping, tighten the hexagonal part of the body with a wrench. Do not tighten it beyond necessity. Failure to follow this notice will deform the body and cause malfunction.
4. Lead the outlet side of the product to a safe place in case water leaks.

• Install a stop valve (cock or gate valve) at the air vent valve inlet in order to perform maintenance and inspection.
• Leakage may occur due to foreign matter and scales inside the pipe. Please install the pipe to the exhaust hole as shown in the diagram, and ensure the outlet end prevents back-flow to the drain.
• When leakage occurs due to foreign matter and scales, close the stop valve, remove the valve seat from the exhaust hole, and clean up the valve.

Troubleshooting

Trouble	Cause	Remedy
Air cannot be exhausted.	1. Stop valve at inlet side has been closed. 2. Piping pressure is above the optimum level.	1. Open the stop valve fully. 2. Reduce the piping pressure or replace the product with a model for high pressure.
Water outflows.	1. Floating valve [2] is stuck by foreign substance. 2. Floating valve [2] is damaged. 3. Float [7] is damaged and loses the specified function.	1. Disassemble the product and clean the floating valve. 2. Replace floating valve [2]. 3. Replace float [7].

Disassembly Procedure

Warning

Completely discharge the pressure inside of the product and piping before disassembly or maintenance. Failure to follow this notice may result in injury due to residual pressure.

1. Remove the valve seat by using a spanner (width across flat: 36 mm).
2. Remove the O-ring (P-28).
3. Remove the floating valve.
4. Remove the clamping bolt (M10) of the cover.
5. Remove the pin fixing the float and then remove the float.
6. Remove the cross recessed pan head machine screw (M4) (by using a cross slot screwdriver).
7. Remove the pin fixing the valve and then remove the valve and float.
8. Remove the valve guide (width across flat: 14 mm) and the hanger.

Exploded View