What Makes a Bottom Entry 3-Way Ball Valve Different?
Standard 3-way ball valves are widely used for flow diversion, distribution, and line switching. Anson Flow also offers a complete range of conventional L-Port and T-Port 3-way ball valves for general applications.
However, when the application requires a different switching sequence, a Bottom Entry 3-Way Ball Valve with 180° operation can provide a more suitable solution.
The Key Difference: 180° Operation
One of the main features of the Bottom Entry design is its 180° operating range.
The operating sequence can be arranged as:
Side A Open → Both Side Ports Closed → Side B Open
At the middle position, both side flow paths are shut off before the valve continues rotating to the opposite side.
This means the valve does not simply switch directly from one line to another. Instead, it provides a clear shut-off position between the two flow directions.
Standard 3-Way vs. Bottom Entry 3-Way
|
Feature |
Standard 3-Way Ball Valve |
Bottom Entry 3-Way Ball Valve |
|
Port Arrangement |
Conventional 3-way arrangement |
Common port from the bottom |
|
Switching Function |
L-Port / T-Port flow switching |
90° / 180° switching |
|
Intermediate Position |
Depends on ball configuration |
Both side ports can be closed |
|
Main Advantage |
Flexible multi-way flow control |
Shut off flow before switching to the opposite line |
|
Typical Use |
General process piping |
Applications requiring controlled line selection |
The biggest difference is therefore not only the bottom connection, but the operating sequence and intermediate shut-off position.
Two Bottom Entry Solutions from Anson Flow
For different system requirements, Anson Flow offers Bottom Entry 3-Way Ball Valves in both process and instrumentation configurations.
AF-S2T 3-Way Bottom Entry Ball Valve
Designed for general process piping applications, the AF-S2T provides:
- Bottom-entry configuration
- 90° / 180° operation
- Intermediate shut-off position
- 2-seat design
- PTFE / Delrin Seats
- L-Port / T-Port options
- ISO 5211 direct mounting
It is suitable for applications such as tank selection, filter switching, pump selection, and process line diversion.
AF-75 Instrumentation 3-Way Ball Valve
For smaller-bore and higher-pressure applications, the AF-75 provides the Bottom Entry concept in a compact instrumentation design.
Key features include:
- Size: 1/8"–1/2"
- 90° / 180° operation
- Pressure Rating: 3000 PSI
- 316 Stainless Steel
- PEEK Seat
- Threaded or Compression Connections
- Compact Bottom Entry design
It is suitable for instrumentation tubing, sampling systems, pressure instruments, and compact high-pressure piping.
Why Choose a Bottom Entry Design?
A Bottom Entry 3-Way Ball Valve can be useful when:
- The common line approaches from below
- Flow must be stopped before switching between two lines
- A clear intermediate shut-off position is required
- Piping space is limited
- Controlled line selection is important
For conventional diversion or distribution duties, Anson Flow also provides a full range of standard 3-way ball valves.
Explore Anson Flow Multi-Way Valve Solutions
Looking for the right 3-way or multi-way valve for your application?
Explore Anson Flow’s Multi-Way Valve range for standard, Bottom Entry, and instrumentation solutions designed for different flow paths, pressures, and piping requirements.
View Multi-Way Valve Solutions:
https://www.ansonflow.com/product-category/multi-way-valve
For product selection, quotation, or technical support, please contact us:
Email: sales@ansonflow.com
Send us your required size, pressure, connection, and flow diagram, and our team can help you select the most suitable valve configuration.