UPVC Air Release Valve

A UPVC Air Release Valve is automatic where air is located at the highest points of the pipeline and other systems, where air is naturally collected. The Upvc air release valve are bubbles of air therefore air enters the relief valve and displaces the liquid inside, when the lower is liquid level so that the drops of upvc air release valve is to such an extent that it no longer floats. the float drops causing the valve to open which vents the accumulated air into the atmosphere.

Once the Upvc air released valve is doing the air is released, then re-enters the valve in liquid and lifts the floats, until the seat against the pressure, and closing the valve. This cycle continues automatically and maintains an air-free system.The purpose of an UPVC Air Release Valve, also known as an Air Relief Valve, is to relieve trapped air that gathers at each maximum height of a full-pressured tube. Because the inner lever system amplifies the floating force to be higher than the inner pressure, a UPVC air release valve may open against inner pressure.

UPVC Air Release Valve Details

d – Outside Diameter (mm),
DN – Nominal Diameter (Diameter Nominal),
PN – Nominal Pressure (Pressure Rating),
C – Face-to-Face / Length of Engagement,
H – Total Height,
L – Length,
L1 – Extended Length / Additional Length,
Z – Center-to-End Distance
g – Approx. Weight (grams)

d	DN	PN	C	H	L	L1	Z	g
20	15	16	55	103	16	18	87	105
25	20	16	66	125	19	20	106	185
32	25	16	75	150	22	24	128	280
40	32	16	87	171	26	28	145	415
50	40	16	100	187	31	34	156	570
63	50	16	122	223	38	41	185	950

Parameter	Specification / Typical Value	Remarks
Valve Type	Air Release Valve (Automatic)	Small or large air vent for pipelines
Body Material	uPVC (Unplasticized Polyvinyl Chloride)	Corrosion resistant
Float / Mechanism	PP / Stainless Steel	Buoyant float for air release
Seal Material	EPDM / NBR	Depends on fluid compatibility
Nominal Size	DN15 – DN100	½” – 4″ typical
End Connection	Socket / Threaded / Flanged	As per DIN / ASTM standards
Pressure Rating	PN10 / PN16	At 20 °C, water service
Max Working Pressure	10–16 bar	Size-dependent
Operating Temp	0 – 60 °C	Above 60 °C derating required
Air Discharge Cap.	2 – 1000 L/min	Depending on size and type
Media	Water, wastewater, mild chemicals	Chemical compatibility must be checked
Operation	Automatic	Opens to release air, closes with fluid
Installation	Vertical (recommended)	Float rises with liquid level
Maintenance	Low	Periodic inspection recommended
Applications	Pipelines, irrigation, pumping	Prevents air locks and cavitation

Automatic air release – It prevents the trapped air from pipelines during filling and operation, improving the flow efficiency.
Made from uPVC – Upvc air release vale are in lightweight, corrosion-resistant, and chemically inert (ideal for water and wastewater)
Low maintenance – Simple internal mechanism with minimal wear parts
High durability – They are resistant to rust, scaling, and most chemicals
Leak-proof sealing – Typically used for rubber/EPDM seals for reliable closure
Smooth internal surface – They are reducing the friction and preventing air pocket buildup.
Pressure compatibility – Upvc air release valves are designed to operate across the standard pipeline pressure ranges.
Easy installation – They are usually threaded or flanged due to their compact design
Cost-effective – Cheaper than metal alternatives with longer service life
UV and weather resistant – Suitable for outdoor installations

Nominal Size (DN)	Size (inch)	Maximum Working Pressure @ 20 °C	PN Class	Remarks
DN15	½”	16 bar (232 psi)	PN16	Small domestic / irrigation lines
DN20	¾”	16 bar (232 psi)	PN16	Standard water pipelines
DN25	1″	16 bar (232 psi)	PN16	Common industrial and municipal lines
DN32	1¼”	16 bar (232 psi)	PN16	Medium pipelines
DN40	1½”	16 bar (232 psi)	PN16	Medium pipelines
DN50	2″	16 bar (232 psi)	PN16	Large domestic / industrial lines
DN65	2½”	10 bar (145 psi)	PN10	Large pipelines
DN80	3″	10 bar (145 psi)	PN10	Large pipelines
DN100	4″	10 bar (145 psi)	PN10	Large industrial lines

If you are searching for customized product designs that meet your requirements, don’t worry. Petron Thermoplast also offers custom product manufacturing services to meet the unique needs of various industries. Work with our expert engineers to create custom designs suited for your application.

Benefits of Using UPVC Air Release Valve

Prevents air locking

The UPVC air release valve automatically releases the air trapped in pipelines, which helps maintain the smooth and efficient flow.

Improves system efficiency

They also remove the pockets of air pocket which reduces the loss of pressure, pump cavitation, and uneven flow.

Corrosion-resistant

UPVC air release valves don’t rust or corrode, making them ideal for water, wastewater, and chemical applications.

Lightweight & easy to install

They are much lighter than other metal valves, so the handling, transport, and installation are quicker and cheaper.

Low maintenance

UPVC air release valves are typically required for minimal upkeep and have fewer moving parts.

Cost-effective

They are generally cheaper than brass, cast iron, or other alternatives, so both in upfront cost and lifecycle cost.

Chemical resistance

They are suitable for many chemicals, fertilizers, and treated water; this is great for irrigation and industrial use.

Long service life

Resistant to scaling, pitting, and environmental degradation when used within rated pressure and temperature limits.

Reduces pipe damage

By releasing air and preventing vacuum formation, it helps avoid pipe collapse and water hammer issues.

Types of UPVC Air Release Valve

1) Automatic Air Release Valves (ARVs)

They automatically release the small pockets of air that they accumulate during normal operation.
They are operating the system without any external intervention.
These are ideal for continuous systems where air is naturally collected at high points.

2) Large-Capacity Air & Vacuum (Air/Water) Valves

These are designed to handle the large volumes of air during the filling or draining of pipelines.
These acts act as vacuum breakers when the piping is emptied, preventing collapse
They provide both rapid air release on filling the air intake and draining

3) Combined UPVC Air Valve (Double Function Valve)

Combines two functions in one unit:
- Releasing the air during normal flow (small air pockets)
- Air expulsion and vacuum are broken during the filling/draining
A versatile, all-in-one solution for long pipelines.

4) Simple UPVC Air Release Valves

Upvc air release valve after the basic design, focusing on releasing only the small air pockets
No vacuum breaking or large volume handling
Lower costs are suitable for short and low-pressure lines.

5) Manual UPVC Air Release Valves

Required the manual operation (hand-operated screw or lever) to release the trapped air.
Used where automatic ARVs are not feasible or for maintenance purposes

6) Two-Stage UPVC Air Valves

Feature separate chambers:
- The first chamber handles the bulk of the air discharge during filling.
- The second chamber takes care of air release during running.

Why Choose Petron Thermoplast?

At Petron Thermoplast, we guarantee accurate and reliable information. Our content, validated by Experts, is crafted following Strong Editorial Policies. We’re committed to providing you with well researched, expert- backed, expert-backed insights for all your informational needs.