Air Valves

Air valves help heating professionals, HVAC service teams, and facility maintenance personnel manage air in compatible equipment and piping. This category includes automatic air vents and air eliminators for hydronic heating systems, vents for heating and cooling systems, float-style vents for boilers and system high points, and a bleeder valve for fuel-pump service applications.

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Helpful Buying Guide

How to Choose an Air Valve

Start with the equipment application and the connection type already in place. The available options include compact automatic and float-style vents, quick-acting vents, hydronic air eliminators with threaded or sweat connections, and a dedicated bleeder valve for fuel pumps.

Visual Guide

Popular examples in this category

Automatic Air Vent with EPDM Seat Disc and O-RingAutomatic Air Vent with EPDM Seat Disc and O-RingWBB3946581-1/4 in. NPT Hydronic Air Eliminator1-1/4 in. NPT Hydronic Air EliminatorWBB762648Hydronic Air Eliminator with 1 in. NPT ConnectionHydronic Air Eliminator with 1 in. NPT ConnectionWBB762629Quick-Acting Air Vent with Self-Sealing Mounting ValveQuick-Acting Air Vent with Self-Sealing Mounting ValveWBB895479
Use Cases

Match the valve to the equipment

Use hydronic air eliminators to vent air bubbles from hydronic heating systems. Choose top air vents for compatible heating and cooling installations, float-style vents for boilers or system high points, and the brass bleeder valve for fuel-pump applications.

How to Choose

Confirm the connection and installation arrangement

Compare NPT thread size or sweat connection size with compatible system piping. Threaded air eliminators are represented in 3/4, 1, 1-1/4, and 1-1/2 in. NPT sizes, while sweat options are represented in 3/4, 1, and 1-1/4 in. sizes.

Applications

Consider the vent style

Automatic air vents provide automatic venting components for heating equipment. A quick-acting model includes a self-sealing mounting valve, while a float-style model is intended for boilers and high points throughout a system.

Additional Info

Review space, pressure, and feature needs

Check compact dimensions where installation space is limited. For applicable quick-acting vent installations, verify that the stated 175 PSI maximum rating fits the application. Hydronic eliminators feature no-clog vent assemblies, adjustable collars, stainless steel concentrators, and bronze bodies.

3/4 to 1-1/2 in.NPT air eliminator sizes

Threaded hydronic air eliminators are represented across four connection sizes.

3 sizesSweat connection options

Sweat air eliminators are represented in 3/4, 1, and 1-1/4 in. sizes.

360°Adjustable collar movement

Selected hydronic air eliminators provide 360-degree collar adjustment.

175 PSIQuick-acting vent maximum

The quick-acting air vent is stated for applications up to this maximum pressure.

Comparison Guide

Compare Air Valve Types

Use this overview to narrow options by application, connection format, and represented features.

Air valve typeConnection options representedKey selection considerations
Hydronic air eliminator3/4, 1, 1-1/4, or 1-1/2 in. NPT; 3/4, 1, or 1-1/4 in. sweatFor hydronic heating; no-clog vent assembly, adjustable collar, stainless steel concentrator, and bronze body.
Automatic, top, float-style, or quick-acting air vent1/8, 1/4, or 1/2 in. NPT; quick-acting model supports 1/8 or 1/4 in. NPTMatch the vent style to heating equipment, heating and cooling systems, boilers, or system high points; review mounting arrangement, dimensions, and stated pressure rating where applicable.
Brass bleeder valve1/8 in. NPTFor fuel-pump use; supplied as one valve.
Planning Guide

Plan the right fit before choosing

Start With the System

Choose a valve designed for the job at hand

The products represented here serve distinct air-management needs. Hydronic air eliminators are designed to vent air from circulating water in hydronic heating systems. Automatic air vents are for compatible heating equipment, while a top air vent supports heating and cooling systems. A float-style vent is used on boilers and at system high points. The brass bleeder valve is specifically intended for fuel pumps.

  • Hydronic heating: air eliminators with threaded or sweat connections
  • Heating equipment: automatic and quick-acting air vents
  • Heating and cooling: top air vent with 1/2 in. NPT connection
  • Boilers and high points: 1/4 in. NPT float-style air vent
  • Fuel pumps: 1/8 in. NPT brass bleeder valve
Check Connections and Installation

Compare pipe connection style and valve configuration

Connection type is a primary selection factor. Hydronic air eliminators are available with NPT connections in 3/4, 1, 1-1/4, and 1-1/2 in. sizes, as well as sweat connections in 3/4, 1, and 1-1/4 in. sizes. Other vents include 1/8, 1/4, and 1/2 in. NPT options, and the quick-acting vent works with either 1/8 or 1/4 in. NPT connections.

  • Match threaded NPT size to compatible system connections
  • Select sweat options for compatible sweat-connected piping
  • Use adjustable 360-degree collars when flexible collar positioning is needed
  • Note that one automatic vent has no built-in shutoff valve or leakage guard
  • Consider the self-sealing mounting valve on the quick-acting vent
Compare Operating Features

Focus on the features represented for hydronic service

The hydronic air eliminators combine a no-clog or debris-resistant vent assembly, an adjustable collar ring, a stainless steel concentrator, and a bronze body. The vent assembly helps manage dirt and debris to minimize fouling, while the concentrator helps reduce gurgling noise as air is removed. Compact vent dimensions may also help with space-conscious layouts.

  • No-clog vent assemblies help control dirt and debris
  • Stainless steel concentrators help eliminate gurgling noise
  • Bronze bodies provide rigid construction
  • Compact automatic and float-style vents support space planning
FAQ

Common questions before buying

What are hydronic air eliminators used for?

They are designed to vent air bubbles from hydronic heating systems to support efficient operation.

What connection sizes are available for threaded hydronic air eliminators?

The represented threaded options include 3/4, 1, 1-1/4, and 1-1/2 in. NPT connections.

Are sweat-connected air eliminators available?

Yes. The represented sweat options include 3/4, 1, and 1-1/4 in. sizes.

Which valve is intended for fuel pumps?

The brass bleeder valve with a 1/8 in. NPT connection is designed for fuel-pump applications.

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