Ball Valves
Quarter-turn isolation with tight shut-off.
Explore Ball ValvesIsolation valve range SIYA supply & sourcing
Trunnion-Mounted Ball Valves
Trunnion-supported ball construction for project-specific isolation.
A trunnion-mounted ball valve uses mechanical supports to locate the ball within the valve body. SIYA can review a trunnion-ball requirement and source a configuration against the service conditions and project datasheet.
Supplied through selected market sources. Manufacturer and model are confirmed in the quotation; SIYA is not represented as the manufacturer.
Overview
Understanding the trunnion-mounted ball valve
In a trunnion-mounted ball valve, the ball is supported by trunnions rather than carried solely by the seats. The exact design, seat arrangement and operating requirements vary by supplier and selected model.
Size, pressure-temperature envelope, materials, connections, operation and applicable standards must be selected together for the actual fluid and service. SIYA confirms the offered make and model against the supplier datasheet before supply.
Construction options
Common trunnion-mounted ball valves designs
These are general valve-family descriptions, not a statement that every configuration is available. The selected supplier and design are confirmed for each quotation.
| Design | Description | Typical context |
|---|---|---|
| Trunnion-mounted ball | The ball is mechanically supported by trunnions; details of the seats, body entry and sealing system vary by model. | Project-specific pipeline and process isolation duties |
Technical selection
Specifications confirmed to order
No model-specific size, pressure, temperature, materials, certificates or standards are guaranteed by this page. The exact specification is checked against the selected supplier's datasheet and confirmed in writing before supply.
- Size, pressure & temperature
- Confirm operating conditions and design envelope for the selected model.
- Body, trim & soft parts
- Match the process fluid, temperature and compatibility requirements.
- Ends & installation
- Specify connection type, facing, drilling and applicable piping standard.
- Operation & accessories
- Confirm manual or actuated operation, control signal and accessories.
- Standards & testing
- Confirm the applicable design, inspection and test requirements for the order.
- Documents & traceability
- State certificate and documentation requirements in the enquiry.
Please do not select a valve from a general web description alone. SIYA will confirm the offered make, model, datasheet and deviations with the quotation.
Where they are used
Typical applications
- Pipeline and process isolation where a trunnion design is specified
- Project requirements identified by an approved datasheet or bill of materials
- Service conditions requiring review of valve torque, seat design and operation
Selection checklist
What to specify
- Fluid composition, temperature and design pressure
- Required size, pressure class and applicable piping standard
- Body, ball, stem, seats and seal materials
- End connection, face-to-face dimension and installation details
- Manual, gearbox or actuated operation and required accessories
- Testing, inspection, certification and documentation requirements
Need a valve for a specific duty?
Send the details you have. We’ll help confirm the right specification.
Include service conditions, quantity and delivery location. A datasheet, BOQ or valve photo is also helpful.