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The Beaver AB Series Air Valve is a combination air valve with two main functions: removing large amounts of air during the filling process and admitting air into the pipeline while it’s being emptied.

For the body lining, this custom-built valve uses Slurryflex Grade-A rubber, a specialty rubber compound that exhibits excellent resilience against wear and abrasion. The lining can be further customised with other materials, including custom-engineered polymer, to further boost abrasion resistance.

The Beaver AB Series Air Valve is specifically engineered for demanding slurry applications and other severe services involving undissolved solids.

Technical specifications




AB150 (Class 150)
AB300 (Class 300)

Size range

DN25–300 (1–12”)

Pressure class

Class 150
Class 300

Temperature range

-29°C to +80°C

End connections


Design and manufacture

ASME B31.3
ASME B16.34

Testing and inspection

API 598

Material specifications

Body and bonnet

Carbon steel
Stainless steel
Duplex and super duplex stainless steel
Exotic alloy

Body and bonnet coating

Multi-pack polyurethane
Multi-pack modified epoxy
Custom options

Body lining

Slurryflex Grade A rubber
Custom-engineered polymer


Nitrile-coated aluminium or stainless steel
Bromobutyl-coated aluminium custom engineered polymer
Urethane-coated aluminium or stainless steel


Wear-resistant natural rubber
Custom-engineered polymer



How we help you choose the right valves:

1. Tell us what you need

Talk to our experts about your application, which valves and controls you need, and any repair or maintenance concerns.

2. Choose the right solution

We’ll do all the analysis, discuss the options with you, and make a recommendation—the valves we’d choose in your shoes.

3. Get the job done

Get the right valves for the job, fitted out, tested, and ready to install. We’ve got your back with ongoing repairs and maintenance.

Talk to a valve specialist

Got questions? Need advice? Our valve specialists can give you practical advice to help you get on with the job.

Valve automation & repairs

Actuators. Positioners. Controls. Valve repairs. Whatever you need, our valve workshop can handle it.