TLV VAS is a float-type mechanical rapid initial air vent designed for water systems. It rapidly vents large volumes of initial air at system start-up. After venting the initial air, the vent can also serve as a vacuum breaker to facilitate drainage by introducing air into the system.

INFO

Once the valve closes after discharging initial air, it will not open again, even if air accumulates inside the product, until the internal pressure drops to near atmospheric pressure. If air is expected to accumulate in the piping during operation, use it together with an automatic air vent.

Features

• Quick Start-up: A large orifice can vent large volumes of initial air for quick system start-up.
• Seal Tightness: The combination of a precision-ground float and a valve seat with rubber contact assures seal tightness when the vent is closed.
• Long Service Life: With only one moving part (the free float), concentrated wear is prevented, providing a long, maintenance-free service life.
• Vacuum Breaker: Dual function as a rapid initial air vent and a vacuum breaker, which facilitates drainage of the system.

Configuration

No.	Description	Material	DIN	ASTM/AISI
1	Body	Cast Iron FC250	0.6025	A126 Cl.B
2	Union	Cast Iron FC250	0.6025	A126 Cl.B
3	Cap Nut	Cast Iron FC250	0.6025	A126 Cl.B
4	Valve Seat	Nitrile Rubber NBR	NBR	D2000BF
5	Valve Seat Holder	Stainless Steel SUS303	1.4305	AISI303
6	Float	Stainless Steel SUS316L	1.4404	AISI316L
7	Float Guide	Polypropylene PP	PP	PP
8	Snap Ring	Stainless Steel SUS304	1.4301	AISI304
9	Valve Seat Gasket	Fluorine Resin PTFE	PTFE	PTFE
10	Union Gasket	Nitrile Rubber NBR	NBR	D2000BF
11	Nameplate	Stainless Steel SUS304	1.4301	AISI304

Specifications

Specification	Value
Connection	Screwed
Size	Inlet: 3/4", Outlet: 1/2"
Maximum Operating Pressure (PMO)	10 barg
Minimum Operating Pressure	0.1 barg
Maximum Operating Temperature (TMO)	100 °C
Applicable Fluid	Water

WARNING

Do not use for toxic, flammable or otherwise hazardous fluids. To avoid abnormal operation, accidents or serious injury, DO NOT use this product outside of the specification range.

Dimensions

Size (Inlet x Outlet)	L (mm)	W (mm)	Weight (kg)
3/4" x 1/2"	97	55 (59.5)	0.6

(W shows face-to-face / diagonal dimensions)

Discharge Capacity

1. Differential pressure is the difference between the inlet and outlet pressure of the air vent.
2. Capacities are equivalent capacities of air at 20 °C under atmospheric pressure.

Proper Installation

1. Before installation, be sure to remove all protective seals.
2. Blow out the inlet piping to remove any piping scraps, dirt and oil.
3. This product must be installed vertically within the limits of inclination, with the inlet at the bottom and the outlet at the top.
4. Install the product in a location where air is likely to collect, such as a bend in the piping.
5. Install outlet piping leading to a drainage vessel or ditch. Make sure the end of the pipe is above the waterline, so that dirt and water can not be sucked up by vacuum when the system shuts down.
6. Be sure to install a valve and strainer (40 mesh or finer) at the product inlet.

Troubleshooting

Problem	Cause	Remedy
No initial air discharged or discharge is poor (blocked)	Air is not reaching the vent because the liquid in the piping is not being displaced by air	Correct the inlet piping (Inner diameter should be at least 16mm [5/8"])
	Valve seat is clogged	Clean valve seat
	Inlet or outlet piping is clogged	Clean piping
Liquid leaks when valve is closed	Build-up on the surface of the valve seat or the valve seat is damaged	Clean or replace with new valve seat
	Float is dirty, coated with a film, or is deformed	Clean or replace with new float
	Improper installation	Correct the installation
Valve does not close, and liquid spurts out	Liquid is inside the float	Replace with new float
	Specific gravity of the liquid is not suitable for this product	Select a product with suitable specifications for the operating conditions