Valves and Valve Equipment

3-Way Brass Ball Valve: L-Port and T-Port Designs, Advantages and Applications

Learn how 3-way brass ball valves divert, split or combine flow, the difference between L-port and T-port designs, their advantages and typical applications.

ORFA Technical TeamUpdated: Oct 30, 20263 min read

Piping systems often need more than simple on/off control: flow may have to be diverted to different lines, split, or combined from two sources. The 3-way brass ball valve does all this with a single valve. Combining the durability of a brass body with the flexibility of a three-port design, these valves are used in applications ranging from water installations to heating and cooling systems and automatic control.

This article explains how 3-way brass ball valves work, the difference between L-port and T-port designs, their advantages, applications and selection criteria.

How Does a 3-Way Ball Valve Work?

A 3-way ball valve has three connection ports in its body. Instead of the straight bore of a 2-way valve, the ball has an L- or T-shaped flow passage. When the ball is rotated by the handle or an actuator, the position of the passage determines which ports are connected. Flow can therefore be switched from one line to another with a single valve.

L-Port vs T-Port

Feature	L-port	T-port
Ball passage	L-shaped	T-shaped
Main function	Diverts flow from the common port to one of two outlets	Diverting, splitting flow into two lines or combining two lines
Connects all three ports at once	No	Yes (in the appropriate position)
Typical use	Selecting between two lines or two devices	Mixing, splitting and multi-directional distribution

The flow paths for each handle position vary by model. Always check the manufacturer’s flow diagram before installation.

Key Features and Advantages

Versatile flow control: One valve can divert, split or combine flow, simplifying system design.
Brass body: Brass offers good corrosion resistance to water and similar media and a long service life.
Compact design: A single valve replaces several 2-way valves and fittings, saving space.
Easy operation: Quarter-turn operation makes changing the flow direction simple.
Automation-ready: Models with a suitable mounting pad can be operated by electric or pneumatic actuators.
Good sealing: The ball and seat design prevents leakage at closed ports.

Typical Applications

Heating and cooling systems: Diverting water of different temperatures or switching between circuits.
Water installations: Distributing water to different lines or selecting between two sources.
Industrial processes: Directing media to different process lines.
Automatic control systems: Remote diverting with an actuator.
HVAC systems: Flow diverting in heating, ventilation and air conditioning circuits.

Tip: 3-way ball valves are mainly intended for on/off and diverting duty. For precise, proportional mixing such as temperature control, use 3-way mixing valves and modulating actuators designed for that purpose.

Selection Criteria

Decide whether you need an L-port or T-port design.
Check that the medium, operating pressure and temperature are within the valve’s limits.
Choose a connection size and type (threaded) that matches the line.
If automation is planned, choose a model suitable for actuator mounting.

Frequently Asked Questions

What is the difference between L-port and T-port 3-way valves?

An L-port valve diverts flow from the common port to one of two outlets. A T-port valve can also split flow into two lines or connect all three ports at the same time.

Can a 3-way ball valve shut off flow completely?

That depends on the ball type and handle positions; T-port valves often cannot close all ports at once. If full shut-off is required, check the manufacturer’s flow diagram or install a separate shut-off valve.

Can a 3-way brass ball valve be used with an actuator?

Yes. Models designed for actuator mounting can be automated with electric or pneumatic actuators.

Conclusion

3-way brass ball valves simplify installations by handling diverting, splitting and combining with a single compact valve. Choosing the right port type and size ensures the system works as intended. For other options, explore our ball valves product group and contact our technical team for support.

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