Yoshitake TAV-2 is an automatic air and gas vent designed for city water applications. It sucks in air promptly when pressure becomes negative in piping or tanks, effectively preventing backflow. The valve intakes and exhausts air automatically as required by the system conditions.

Features

• Sucks in air promptly when pressure becomes negative in piping or tank, preventing back flow.
• Intakes / Exhausts air automatically as required.

Specifications

Application	City water
Working pressure	0.05-1.0 MPa
Operating pressure of air intake valve	-1.0 kPa {-100 mmAq} or less (air intake less than pressure 0)
Maximum temperature	0-80°C (no freeze condition)
Material (Body)	Cast bronze (NPb-treated)
Material (Float)	Synthetic resin
Material (Exhaust packing)	Synthetic rubber
Connection port	JIS R
Intake and exhaust port	JIS Rc 1/4 (φ8 hose joint)

Dimensions and Weights

Nominal size	d	H (mm)	Intake and exhaust port	Weight (kg)
15A	Rc 1/2	107	Rc 1/4	0.8

Performance and Piping

Intake/Exhaust Capacity Chart

Piping Example

Construction and Parts

No.	Name of Parts	Material	Q.TY
1	Float Body	PE	1
2	Exhaust Valve Seat	Bronze (CAC406C)	1
4	O Ring	NBR	1
5	Exhaust Packing	EPDM	1
6	O Ring	NBR	1
7	Exhaust Spring	Stainless Steel (SUS304)	1
8	Exhaust Valve	Bronze (CAC406C)	1
9	Spring Holder	Bronze (CAC406C)	1
10	Lever Bord	PPO	1
11	Body	Bronze (CAC406)	1
12	Cover	Bronze (CAC406)	1
15	C Type Retaining Rings for Holes	Stainless Steel (SUS420J2)	1
16	C Type Retaining Rings for Holes	Stainless Steel (SUS420J2)	1
20	O Ring	NBR	1
21	O Ring	NBR	1
22	Spring	Stainless Steel (SUS304)	1
23	Cartridge A	PPO	1
24	Cartridge B	PPO	1
25	Cartridge C	PPO	1
26	Float Shaft	PE	1
40	Hose Joint	Brass (C3604)	1

Precautions for Installation

Installation and Safety

• In anticipation of water leakage from the air inlet or outlet of the product, connect induction piping to the air inlet and outlet, and guide it to the hopper (drain ditch). Keep a clearance of 25 mm or more between the end of the induction piping and the overflow line of the hopper.
• When hot water is used, its leakage may cause burns or contamination in the area where the product is installed.
• Drain water when the atmospheric temperature is low, in winter for example, or water is not to be used for a long period of time.

Maintenance and Piping

• Before connecting the product, carefully wash the inside of piping to remove dirt, scale, etc.
• When connecting the product to piping, pay attention to the quantity and application position of sealing agent or where to attach seal tape.
• Do not disassemble the product.
• Prepare enough space for inspections, maintenance, and repairs. Do not install the product under the roof or inside the wall.
• Vertically install the product in a position where air tends to accumulate.
• Use a stop valve (gate valve, ball valve, cock, etc.) for maintenance and inspections in any case. Do not use a globe valve.