The TLV VA1 is a float-type mechanical rapid initial air vent designed for water piping systems. It rapidly vents air at start-up for moderate to hot water applications and can also serve as a vacuum breaker after venting the initial air. The VA series includes models VA1, VA3, VA4, and VA5, accommodating various connection sizes and capacities.

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 together with an automatic air vent.

Features

1. Large orifice can vent large volumes of initial air for quick system start-up.
2. Combination of precision-ground float and valve seat with rubber contact assures seal tightness when vent is closed.
3. Only one moving part, the free float, eliminates concentrated wear and provides long maintenance-free service life.
4. Facilitates drainage of the system by introducing air when the system has to be drained.
5. Dual function as a rapid initial air vent and a vacuum breaker.

Specifications

Model	VA1	VA3	VA4	VA5
Connection Inlet	Flanged	Flanged	Flanged	Flanged
Connection Outlet	Screwed	Screwed	Flanged	Flanged
Size Inlet (mm)	50	80	100	150
Size Outlet (mm)	20	32	65	100
Maximum Operating Pressure (MPaG) PMO	1.0	1.0	1.0	1.0
Minimum Operating Pressure (MPaG)	0.01	0.01	0.01	0.01
Maximum Operating Temperature (°C) TMO	100	100	100	100
Applicable Fluid	Water	Water	Water	Water

Do not use for toxic, flammable or otherwise hazardous fluids.Maximum Allowable Pressure (PMA): 1.0 MPaGMaximum Allowable Temperature (TMA): 150 °C

Materials

No.	Description	Material	JIS	ASTM/AISI
1	Body	Cast Iron	FC250	A126 Cl.B
2	Cover	Cast Iron	FC250	A126 Cl.B
3	Float	Stainless Steel	SUS316L	AISI 316L
4	Cover Gasket	Fiber-Rubber Compound	-	-
5	Cover Bolt	Carbon Steel	SS400	A307 Gr.B
6	Valve Seat	Nitrile Rubber	NBR	D2000BF
7	Valve Seat Retainer (VA1)	Brass	C3604	B16 C36000
7	Valve Seat Retainer (VA3-5)	Bronze	CAC407	B584 C92200
8	Set Screw	Brass	C3604	B16 C36000
9	Float Guide	Bronze	CAC407	B584 C92200
10	Snap Ring	Stainless Steel	SUS304	AISI 304

Dimensions

Model	Size Inlet	Size Outlet	L (125FF)	L (150RF)	φW	Weight (kg)
VA1	50	20	126	130	110	5.1
VA3	80	32	170	174	145	9.5
VA4	100	65	297	301	235	34
VA5	150	100	447	447	335	72

(Dimensions in mm. Weight is for Class 125 FF.)

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.

Configuration

No.	Part Name	No.	Part Name
1	Body	8	Set Screw
2	Cover	9	Float Guide
3	Float	10	Snap Ring
4	Cover Gasket	11	Union (VAS only)
5	Cover Bolt	12	Cap Nut (VAS only)
6	Valve Seat	13	Valve Seat Gasket
7	Valve Seat Holder / Retainer	14	Union Gasket (VAS only)

Installation

WARNING

• Installation, inspection, maintenance, repairs, disassembly, adjustment and valve opening/closing should be carried out only by trained maintenance personnel.
• Take measures to prevent people from coming into direct contact with product outlets.
• Install for use under conditions in which no freeze-up will occur.
• Install for use under conditions in which no water hammer will occur.

1. Before installation, be sure to remove all protective seals.
2. Before installing the product, blow out the inlet piping to remove any piping scraps, dirt and oil. Close the inlet valve after blowdown.
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.

Inspection and Maintenance

Visual inspections should be carried out periodically to determine whether the rapid initial air vent is operating properly or has failed. Operational inspections should be performed at least twice per year.

DANGER

NEVER apply direct heat to the float. The float may explode due to increased internal pressure, causing accidents leading to serious injury or property and equipment damage.

Parts Inspection Procedure:

• Gasket: Check for warping or damage
• Valve Seat Surface: Check for scratches or wear
• Float: Check for deformation, damage, oil film or liquid inside
• Float Guide: Check for deformation

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)
	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