TLV VS1C-M2 is a stainless steel automatic air vent designed for vertical installation in high-temperature liquid systems. It automatically vents air from liquids with a specific gravity above 0.8, which ensures quick system start-up and efficient water transport. The air vent also automatically discharges air that is entrained in the water during operation and has collected in specific locations in the piping. In addition to venting air, it serves a dual function as a vacuum breaker.

WARNING

DO NOT use for toxic, flammable or otherwise hazardous fluids. This product is an air vent that discharges air from water piping systems. Use only for water and/or air.

Features

• Precision-ground float, three-point seating, and valve seat with rubber contact ensure superior sealing.
• Unique rotational seating design eliminates concentrated wear and provides a long service life.
• Dual function as an air vent and vacuum breaker.
• All stainless steel construction provides outstanding corrosion resistance.
• Simple construction with few parts allows for easy maintenance.
• Optional high-temperature stainless steel valve seat is available.

Operation

1. When water is transported, air inside the piping is forced into the air vent by the pressure of the flow. The float inside the air vent is in the lower position, thus the valve is fully open and allows the air that enters the air vent to be discharged.
2. When discharge is completed, as water flows into the air vent, the rising water level causes the float to rise and to close the valve.
3. If air enters the air vent while the water is causing the valve to be closed, the air causes the water level to drop, thus the float loses buoyancy and the valve opens. After the air is discharged, the water level once again rises and the valve closes. In this manner, the air vent constantly responds to the amount of water flow by automatically adjusting discharge.
4. When draining the piping, the air vent automatically opens to introduce air and remove water more easily (preventing a vacuum from forming in the piping).

Configuration and Materials

No.	Description	Material	DIN	ASTM/AISI
1	Body	Cast Stainless Steel	1.4312	A351/A351M Gr.CF8
2	Cover	Cast Stainless Steel	1.4312	A351/A351M Gr.CF8
3	Float	Stainless Steel	1.4404	AISI316L
4	Valve Seat	Fluorine Rubber / Stainless Steel	FPM/1.4305	D2000HK/AISI303
5	Valve Seat Gasket	Fluorine Resin PTFE	-	-
6	Cover Gasket	Fluorine Resin PTFE	-	-
7	Cover Bolt	Stainless Steel	-	-
8	Nameplate	Stainless Steel	1.4301	AISI304
9	Connector	Stainless Steel	1.4301	AISI304
10	Screw	Stainless Steel	1.4301	AISI304
11	Spring Washer	Stainless Steel	1.4301	AISI304
12	Guide Plate	Stainless Steel	1.4301	AISI304

Dimensions

Size	L (mm)	W (mm)	W1 (mm)	S (mm)	Weight (kg)
15	110	110	85	85	1.5
20	120	110	85	85	1.5
25	130	110	85	85	1.7

Discharge Capacity

INFO

1. Line numbers within the graph refer to orifice numbers.
2. Differential pressure is the difference between the inlet and outlet pressure of the air vent.
3. Capacities are equivalent capacities of air at 20 °C and atmospheric pressure.

Installation Guidelines

• The product must be installed vertically, with the inlet at the bottom and the outlet at the top, inclined no more than 5° horizontally.
• Install in a location where air is likely to collect, such as a bend in the piping.
• Inlet piping with no horizontal portion is recommended for water/air displacement.
• Ensure the inlet piping diameter is at least as large as the product's inlet diameter. For the 15 mm nominal diameter, use a pipe/fitting with an inner diameter of at least 16 mm.

Troubleshooting

Problem	Cause	Remedy
No air is discharged (blocked) or discharge is poor	The trapped air cannot displace the water in the piping	Correct the inlet piping (Inner diameter should be at least 16 mm)
	The valve seat is clogged with dirt or foreign matter	Clean the valve seat
	The inlet or outlet piping is clogged	Clean the piping
	Operating pressure exceeds the rated maximum	Replace with a product of suitable operating pressure
Water leaks when the valve is closed	Build-up of rust/scale on the valve seat, or seat is damaged	Clean or replace with a new valve seat
	Float is misshapen, dirty or has a film build-up	Clean or replace with a new float
	Improper installation orientation	Correct the installation
Vent does not close and water is blowing	Float is damaged or filled with water	Replace with a new float
	Specific gravity of the liquid is not suitable	Select a product with suitable specifications