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SPIRAX Marshall Air Vent BPT21 / AV21

Price 4000 INR/ Unit

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MOQ : 1 Number

SPIRAX Marshall Air Vent BPT21 / AV21 Specification

Coating Type
Industrial Protective Coating

Thread Type
BSPT/NPT

Diameter
Variable (Typically 1/2 or 3/4)

Temperature Range
Up to 232C

Sealing Type
Metal to Metal / O-Ring

Flexibility
Rigid / Fixed

Connection Type
Screwed BSPT/NPT or Socket Weld Ends

Product Type
Air Vent

Material
Carbon Steel

Connection
Screwed or Socket Weld

Shape
Compact / Cylindrical

Standard
AISI

Surface Treatment
Corrosion Resistant Coating

Section Shape
Round

Length
Approx. 90 mm (varies by model)

Color
Metallic / Brass

Warranty
12 months

Usage
Air venting from steam and process lines

Rated Pressure
Up to 21 bar g

Application
Removal of Air and Gases from Steam Lines

Material Grade
BS EN 1982 CB491K

End Connection Size
1/2" (15mm) & 3/4" (20mm)

Body End Connections
Screwed (Female) or Socket Weld

Mounting Position
Horizontal Installation

Model Number
BPT21 / AV21

Media
Air, Steam

Operation
Automatic Air Release

Testing Pressure
Up to 32 bar g

Float Type
Stainless Steel Ball Float

Body Design
Robust, Durable Construction

Discharge Capacity
High Capacity for Air / Gas

SPIRAX Marshall Air Vent BPT21 / AV21 Trade Information

Minimum Order Quantity
1 Number

Supply Ability
10 Per Week

Packaging Details
Standard

Main Domestic Market
All India

About SPIRAX Marshall Air Vent BPT21 / AV21

SPIRAX Marshall Thermostatic Steam Trap/Air Vent BPT 21 / AV 21

Description: Thermostatic Steam Trap / Air Vent fitted with an inbuilt flat strainer screen having 0.8 mm dia. perforations.

Size and Pipe Connections :

15 NB and 20 NB Screwed BSPT/NPT Socket Weldable Ends.

Limiting Conditions:

PMO - Max. Operating Pressure 21 barg

TMO - Max. Operating Temperature 285 C

Cold hydraulic test pressure 42 barg

Durable and Reliable Construction

Manufactured with a robust carbon steel body and stainless steel ball float, the SPIRAX Marshall BPT21 / AV21 ensures long-lasting performance even in demanding steam or process line applications. The industrial protective coating further enhances its corrosion resistance, making it suitable for a wide range of industrial settings.

High-Capacity Air and Gas Discharge

Designed for efficient and automatic removal of air and gases from steam lines, this air vent offers high discharge capacity. Its compact, cylindrical shape allows for easy installation without compromising on flow or operational performance.

Versatile Connection and Installation Options

The BPT21 / AV21 model provides both screwed (BSPT/NPT) and socket weld end connections. Compatibility with variable sizes (1/2" and 3/4") allows flexible installation in existing systems, and the horizontal mounting ensures optimal air venting efficiency.

FAQ's of SPIRAX Marshall Air Vent BPT21 / AV21:

Q: How does the SPIRAX Marshall Air Vent BPT21 / AV21 function in steam pipelines?

A: The air vent operates automatically, using a stainless steel ball float mechanism to sense and discharge trapped air or non-condensable gases from steam and process lines, enhancing operational efficiency and preventing air-related system issues.

Q: What are the main benefits of installing this air vent in a steam line system?

A: Installing the BPT21 / AV21 model ensures prompt removal of unwanted air and gases, which prevents water hammer, maintains optimal heat transfer, and improves overall system reliability and lifespan.

Q: When should the air vent be serviced or replaced?

A: It is recommended to inspect the unit periodically, at least once every 6-12 months, to check for wear or debris build-up. Replacement is needed if there are signs of persistent leakage, operational failure, or mechanical damage.

Q: Where can this air vent be installed within an industrial setting?

A: The unit is designed for horizontal installation on steam distribution lines, process piping, or other applications requiring efficient removal of air or gases. Its compact size and versatile connections allow placement at critical venting points.

Q: What is the installation process for the BPT21 / AV21 air vent?

A: The air vent can be installed by connecting it to compatible threaded (BSPT/NPT) or socket weld pipe ends. Ensure the unit is mounted horizontally, and follow all applicable pipeline design and safety standards during installation.

Q: What materials are used in the construction of this air vent?

A: The body is made from carbon steel with a corrosion-resistant protective coating, and the float inside is manufactured from high-grade stainless steel, ensuring both durability and resistance to harsh industrial environments.

Q: What warranty and quality standards apply to this air vent model?

A: The SPIRAX Marshall Air Vent BPT21 / AV21 comes with a 12-month warranty and complies with AISI standards as well as material grade BS EN 1982 CB491K, ensuring reliable and certified performance.

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