Products Description
A Pneumatic Actuated 3 Way Flanged Ball Valve is an automated quarter-turn valve designed to divert, mix, or switch fluid flow in industrial piping systems. Combining a pneumatic actuator with a three-way flanged ball valve, it provides fast, reliable, and repeatable operation for water, oil, natural gas, steam, chemicals, and other compatible media.
Available with L-port and T-port ball configurations, the valve supports automatic flow control in applications where multiple pipeline directions must be managed without manual intervention. Standard ISO 5211 mounting allows easy integration with pneumatic accessories and industrial automation systems.
Designed for long-term industrial service, pneumatic 3-way flanged ball valves are widely used in oil & gas, chemical processing, water treatment, power generation, HVAC, food processing, pharmaceutical, and general industrial automation.
How Does a Pneumatic 3-Way Ball Valve Work?
The pneumatic actuator converts compressed air into rotary motion.
When compressed air enters the actuator cylinder, the piston moves and drives the rack-and-pinion mechanism. The pinion rotates the valve stem by 90°, changing the flow path inside the three-way ball.
Depending on the ball design, the valve can perform:
Flow diversion
Flow mixing
Pipeline switching
Two-line selection
Three-line interconnection (T-port only)
For critical process applications, a spring-return actuator automatically returns the valve to its predefined open or closed position if the air supply is lost, improving operational safety.
Products specification
| Item | Parameters |
|---|---|
| Nominal Diameter | DN15~200mm |
| Connection Method | Flange |
| Cylinder Configuration | AT series, GT series and imported actuator series |
| Cylinder Type | Double-acting, Single-acting (spring return) |
| Control Method | Reversing, Diverting |
| Nominal Pressure | 16, 25bar (Please specify when ordering for higher pressure requirements) |
| Air Supply Pressure | Double-acting: 4~8bar; Single-acting: 5~8bar |
| Medium Temperature | W1: -40~180℃; W2: -40~300℃; W3: -30~425℃; W4: -40~425℃ |
| Ambient Temperature | Standard type: -20~80℃ |
| Valve Body Material | Carbon steel (C), Stainless steel (P4, P6) |
| Sealing Material | Polytetrafluoroethylene (F), Para-phenylene (PPL), Metal hard seal (H), Cemented carbide (Y) |
Main component materials
| Serial Number | Part Name | Material (C) | Material (P4) | Material (P6) |
|---|---|---|---|---|
| 1 | Right Valve Body | WCB | ZG1Cr18Ni9Ti | ZG1Cr18Ni12Mo2Ti |
| 2 | Nut | 35 | 1Gr18Ni9Ti | 1Gr18Ni9Ti |
| 3 | Gasket | PTFE/Graphite Metal Composite Gasket | ||
| 4 | Bolt | 35 | 1Gr18Ni9Ti | 1Gr18Ni9Ti |
| 5 | Valve Body | WCB | ZG1Cr18Ni9Ti | ZG1Cr18Ni12Mo2Ti |
| 6 | Valve Seat | PTFE/Nylon/Paraphenylene/Metal Hard Seal | ||
| 7 | Ball | 1Gr18Ni9Ti | 1Gr18Ni9Ti | 1Cr18Ni12Mo2Ti |
| 8 | Valve Stem | 1Gr13 | 1Gr18Ni9Ti | 1Cr18Ni12Mo2Ti |
| 9 | Gasket | PTFE | PTFE | PTFE |
| 10 | Packing | PTFE/Flexible Graphite | ||
| 11 | Bushing | PTFE Composite Bearing | ||
| 12 | Gland | WCB | ZG1Cr18Ni9Ti | ZG1Cr18Ni12Mo2Ti |
| 13 | Bolt | 35 | 1Gr18Ni9Ti | 1Gr18Ni9Ti |
| 14 | Bolt | 35 | 1Gr18Ni9Ti | 1Gr18Ni9Ti |
| 15 | Connecting Bracket | 1Gr18Ni9Ti | 1Gr18Ni9Ti | 1Gr18Ni9Ti |
| 16 | Bolt | 35 | 1Gr18Ni9Ti | 1Gr18Ni9Ti |
| 17 | Connecting Sleeve | 35 | 1Gr18Ni9Ti | 1Gr18Ni9Ti |
| 18 | Pneumatic Device | Extruded Aluminum Alloy | ||
| 19 | Position Indicator | Plastic | Plastic | Plastic |
Operating Conditions
| Item | Typical Range |
|---|---|
| Suitable Media | Water, Oil, Natural Gas, Steam, Chemicals, Air and Compatible Fluids |
| Operating Temperature | Depends on body and seat materials |
| Soft Seat | Typically -20°C to +180°C |
| Metal Seat | Up to approximately +450°C |
| Ambient Temperature | -20°C to +80°C (standard actuator) |
| Working Pressure | According to selected pressure class |
Note: Maximum operating temperature depends primarily on the seat material rather than the valve body. Metal-seated valves are recommended for high-temperature service, while PTFE seats provide bubble-tight shutoff for general industrial applications.
Pneumatic Actuator Specifications
| Item | Specification |
|---|---|
| Actuator Type | Rack-and-Pinion Pneumatic Actuator |
| Operation | Double-Acting or Spring Return |
| Air Supply Pressure | 3–8 bar (Recommended) |
| Maximum Air Pressure | 8–10 bar (Depending on actuator model) |
| Rotation Angle | 90° ±5° |
| Adjustment | Fine adjustment at open and closed positions |
| Cycle Life | Up to 1,000,000 cycles under normal operating conditions |
| Protection Class | IP67 |
| Mounting Standard | ISO 5211 / NAMUR |
| Control Interface | NAMUR Solenoid Valve Compatible |
L-Port vs T-Port: Which Should You Choose?
Selecting the correct ball configuration is one of the most important decisions when purchasing a 3-way ball valve.
| Feature | L-Port Ball | T-Port Ball |
|---|---|---|
| Primary Function | Flow diversion | Flow diversion & mixing |
| Connect Two Ports | ✔ | ✔ |
| Connect Three Ports Simultaneously | ✘ | ✔ (depending on ball orientation) |
| Mix Two Fluids | ✘ | ✔ |
| Typical Applications | Pipeline switching, tank selection | Mixing systems, bypass lines, distribution manifolds |
| Recommended For | Switching one inlet between two outlets or vice versa | Mixing or distributing flow among multiple pipelines |
Choose an L-port valve if your system only requires switching flow between two pipelines without mixing.
Choose a T-port valve when the process requires fluid mixing, distribution, or multiple simultaneous flow paths.
Applications
Pneumatic actuated 3-way flanged ball valves are commonly installed in automated process systems requiring reliable flow switching.
Oil & Gas
Pipeline switching
Storage tank transfer
Loading and unloading systems
Natural gas distribution
Process flow control
Chemical & Petrochemical
Chemical dosing systems
Corrosive fluid handling
Solvent transfer
Process automation
Reactor feed control
Water & Wastewater Treatment
Water distribution
Filtration systems
Chemical injection
Sewage treatment
Pump bypass systems
Power Generation
Cooling water systems
Boiler auxiliary pipelines
Steam auxiliary systems
Condensate recovery
Food, Beverage & Pharmaceutical
Process fluid transfer
CIP cleaning systems
Purified water systems
Hygienic process automation
General Industrial Automation
Compressed air systems
Hydraulic systems
Process skids
OEM equipment
Factory automation
How to Select the Right Pneumatic 3-Way Ball Valve
Selecting the correct valve improves service life, reduces maintenance, and ensures reliable automation.
Consider the following factors before ordering:
| Selection Item | Recommendation |
|---|---|
| Flow Function | L-port for diversion; T-port for mixing and diversion |
| Valve Material | WCB for general service; CF8/CF8M for corrosive media |
| Seat Material | PTFE for general applications; reinforced PTFE or metal seat for higher temperatures |
| Actuator Type | Double-acting for frequent operation; spring return for emergency shutoff |
| Connection | Flanged, threaded, socket weld (SW), butt weld (BW), or sanitary clamp |
| Working Pressure | Select according to pipeline pressure class (PN, ANSI, or JIS) |
| Temperature | Verify media temperature before selecting seat material |
| Accessories | Solenoid valve, limit switch box, air filter regulator, positioner, manual override |
Tip: Instead of selecting a valve only by pipe size, always confirm the working pressure, temperature, media type, fail-safe requirement, and automation accessories to ensure the valve matches your operating conditions.
Share your project requirements, and we'll recommend the right valve configuration with a fast quotation, technical support, and OEM customization.
Inspection & Quality Assurance
Reliable valve performance depends not only on design but also on strict manufacturing and inspection procedures.
Before delivery, each valve can be inspected in accordance with customer specifications and applicable international standards.
Typical inspection items include:
100% visual inspection
Dimensional inspection
Shell pressure test
Seat leakage test (API 598 or ISO 5208)
Pneumatic actuator functional test
Opening and closing torque verification
Air leakage inspection
Material verification (PMI, when required)
Third-party inspection available upon request
Test reports, material certificates, pressure test certificates, and inspection documentation can be supplied for project requirements.
CNC SEIK workshop
Frequently Asked Questions
Q1. What is the difference between an L-port and a T-port ball valve?
An L-port valve is mainly used to divert flow between two pipelines without mixing the media. A T-port valve can divert, distribute, or mix flow, depending on the ball orientation, making it suitable for more complex piping systems.
Q2. Should I choose a double-acting or spring-return actuator?
A double-acting actuator is recommended for frequent automatic operation where compressed air is always available.
A spring-return actuator automatically returns the valve to its preset fail-safe position if the air supply is lost, making it ideal for emergency shutdown or critical process applications.
Q3. Can a pneumatic 3-way ball valve be used for throttling?
These valves are primarily designed for on/off service and flow switching. Continuous throttling is generally not recommended unless the valve is specifically designed for control applications.
Q4. Which seat material should I choose?
PTFE – General industrial applications with excellent sealing performance.
Reinforced PTFE (RPTFE) – Improved wear resistance and higher pressure capability.
PPL – Higher temperature applications.
Metal Seat – High-temperature, abrasive, or severe service conditions.
Seat material should always be selected according to the operating temperature, pressure, and process media.
Q5. What accessories are commonly installed?
Common pneumatic accessories include:
Solenoid valve
Limit switch box
Air filter regulator
Positioner
Manual override
Position transmitter
The appropriate accessories depend on the required level of automation and control.
Q6. What information is required before ordering?
To recommend the correct valve configuration, suppliers typically require:
Valve size
Working pressure
Operating temperature
Process media
Flow function (L-port or T-port)
Connection standard
Valve body material
Seat material
Actuator type
Required accessories
Providing complete operating conditions helps ensure accurate valve selection.
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