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Other Devices

VA Series/VS1A - Rapid Initial Air Vents

Price: Contact

Model: VA Series/VS1A

Trademark: TLV

Origin: Japan

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Rapid Initial Air Vents

VA Series/VS1A

Swiftly discharge all air/gas in pipes upon startup

Rapid initial air vents feature a large orifice, allowing them to discharge large quantities of air in a short time. This makes them the ideal choice for removing air from water tanks and water supply pipes during startup.

Once the initial air has been discharged, the valve will close and typically will not open again during normal operation. However, when pressure in the pipes falls to near or below atmospheric pressure, the valve will open once more. This allows air to enter, preventing vacuum conditions from forming within the pipes and allowing liquid to be easily passed downstream.

Though rapid initial air vents are able to discharge large quantities of air quickly, once the valve closes, it will not open again as long as a pressure differential is maintained. If it is necessary to continuously discharge air during normal operation, please use this product together with an automatic air vent.

Air Vents Pamphlet (1930 KB)

Benefits and Features

Automated Initial Air Discharge

The large-size valve seat rapidly discharges initial air. The float responds with great sensitivity to condensate levels, automatically closing the valve and thereby eliminating the need for manual labor.

Long Service Life

Simple construction with no levers or hinges
Only one moving part: the Free Float®. This eliminates concentrated wear and provides long service life.

Tight Sealing

Provides a tight, reliable seal

Rapid Initial Air Vents (all series)

Can function as a vacuum breaker by allowing air to flow in when a vacuum forms

VAS & VA Series

Precision-ground float, rubber valve seat

VS1A Series

High precision-ground float, 3-point seating
Can be used with liquids with specific gravities as low as 0.8

Application Areas

Rapid initial air vents are suitable for:

instances where there is a need for the rapid discharge of air upon system startup
processes which require expedited water supply
water supply pipes, water tanks, water pumps (VAS, VA)
storage tanks for non-water liquids (VS1A, non-flammable and non-corrosive liquids)

*Once the valve closes after discharging initial air, it will not open again, even if air enters the air vent. If air is expected to accumulate during normal operation, please use together with an automatic air vent.

Product Details

Model	Photo	Connection		Body material	Lưu chất	PMO (MPaG)	Min. Operating Pressure (MPaG)	TMO (°C)	Max. discharge capacity (ℓ/min)*	Catalogue	Manual
Model	Photo	Inlet	Outlet	Body material	Lưu chất	PMO (MPaG)	Min. Operating Pressure (MPaG)	TMO (°C)	Max. discharge capacity (ℓ/min)*	Catalogue	Manual
VA1		Inlet	Outlet	Flanged	Screwed	Cast Iron (FC250)	Water	1.0	0.01	100	1400	Specifications	Contact PME
VA3		Flanged	Screwed	Cast Iron (FC250)	Water	1.0	0.01	100	3200
VA4		Flanged		Cast Iron (FC250)	Water	1.0	0.01	100	5600
VA5		Flanged		Cast Iron (FC250)	Water	1.0	0.01	100	11000
VAS		Screwed		Cast Iron (FC250)	Water	1.0	0.01	100	500	Specifications
VS1A		Screwed		Stainless Steel (ASTM A351 Gr.CF8)	Water Other liquids	2.1	0.01	150	270	Specifications	Contact PME