Yoshitake TA-16CVA air vent valve is essential for air-conditioning piping systems, building equipment, and industrial applications. Air mixed in the piping leads to a decline in heat-effectiveness, noise production, and corrosion of equipment. The TA-16CVA series is constructed from stainless steel (except for the valve disc, gasket, and check valve joints) offering high durability and corrosion resistance. It features an angle-type check valve joint that prevents the valve from sucking in outside air under negative pressure, effectively stopping water level drops in piping when the equipment is inactive.

Features

• Stainless Steel Construction: All main parts (body, cover, float) are made of stainless steel for high resistance to corrosion.
• Stable Capacity: A wide working pressure range (0.01 to 1.0 MPa) ensures stable exhaust capacity.
• Space-Saving: The compact body allows for straightforward installation in tight spaces.
• High Sealability: No leakage thanks to the FKM (fluororubber) valve disc.
• Air Suction Prevention: Built-in check valve joints (angle type for CVA, straight type for CVS) restrict outside air from entering the system.

Specifications

Specification	TA-16CVA (Angle Check Joint)	TA-16CVS (Straight Check Joint)
Application	Cold and hot water	Cold and hot water
Working Pressure	0.01 - 1.0 MPa	0.01 - 1.0 MPa
Closing Pressure of Check Valve	-0.005 MPa or less	-0.005 MPa or less
Maximum Temperature	90°C	90°C
Connection (Inlet)	JIS R screwed (P.V common core)	JIS R screwed
Connection (Outlet)	JIS Rc 1/4 screwed	JIS Rc 1/4 screwed

Material Details

Part	Material
Body, Cover	Cast Stainless Steel (SCS13 / SUS304)
Valve Disc, Gasket	FKM (Fluororubber)
Float	Stainless Steel (SUS304)
Check Valve Joint	Brass (C3604)
Check Valve	FKM (Fluororubber)

Dimensions and Weights

TA-16CVA

Nominal Size	d	H1 (mm)	H (mm)	Weight (kg)
15A	R 1/2	135.5	146	0.72
20A	R 3/4	137.5	148	0.74
25A	R 1	142.0	152.5	0.80

TA-16CVS

Nominal Size	d	H (mm)	Weight (kg)
15A	R 1/2	142	0.70
20A	R 3/4	144	0.72
25A	R 1	148.5	0.78

Exhaust Capacity Chart

Operational Description

1. After installation, air exists in the product, and the float is lowered by its own weight. In this condition, since the valve disc is kept open by the lever, 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 come up on buoyancy, and the force that keeps the valve disc open through the lever is lost. The valve disc is closed by the spring and system pressure.
3. When air bubbles are generated in the system and collected into the product, the inside water level drops. The float loses buoyancy and opens the valve disc to discharge air.
4. The operation then goes back to process [2]. By repeating processes [2] and [3], air in the system is continuously removed.

Piping and Installation

Installation Guidelines

• Remove foreign matter and scales from the lines and install the valve vertically (tolerance angle 5°) where air is likely to gather.
• Install a stop valve (cock or gate valve) at the inlet side of the air vent valve to facilitate maintenance.
• Ensure the end of the piping or tube from the product outlet leaves a space of at least 50mm over the flood level.

Precautions Before Use

• Make sure to attach a joint and hose to the outlet of the product, leading them to a drain ditch. High-temperature fluid leakage can cause burns or property damage.
• There might be a possibility of leakage caused by scale inside the pipe, so ensure the point of the outlet side does not allow backflow to the drainage channel.

Exploded View and Parts List

No.	Name of Parts	Material	Q.TY
1	Body	Cast Stainless Steel (SCS13)	1
2	Cover	Stainless Steel (SUS304)	1
3	Seat	Stainless Steel (SUS304)	1
4	Hanger Metal	Stainless Steel (SUS304)	1
5	Valve Disc	FKM	1
6	Valve Cover	Stainless Steel (SUS304)	1
7	Spring	Stainless Steel (SUS304)	1
8	Lever	Stainless Steel (SUS304)	1
9	Nut	Stainless Steel (SUS)	1
10	Hook	Stainless Steel (SUS304)	1
11	Float	Stainless Steel (SUS304)	1
12	Gasket	FKM	1
17	Body (Check Valve Joint)	Brass (C3604)	1
18	Check Valve	FKM	1

Troubleshooting

Trouble	Cause	Remedy
No air discharge	Stop valve on inlet side is kept closed.	Open the stop valve fully.
	Internal piping pressure is more than the appropriate value.	Lower the internal piping pressure, or replace the valve with a high-pressure model.
	Air accumulates too slowly.	Install the valve on a place where air is easy to accumulate.
Water blowout	Foreign substances exist on the valve disc and seat.	Remove and clean the valve disc and seat.
	The float is damaged and cannot work properly.	Replace the float.
External leakage	Damage or deformation of the body or cover due to abnormal pressure rise.	Replace the product.
	Gasket is damaged.	Replace the gasket.
Sucking in outside air	Foreign substances exist on the check valve.	Remove foreign substances.