Plug Valves
Compact quarter-turn shut-off for process lines.
Explore Plug ValvesIsolation valve range SIYA supply & sourcing
Ball Valves
Quarter-turn isolation with tight shut-off.
Quarter-turn isolation valves for on/off service across process, utility, oil & gas and general industrial lines. SIYA helps you match the construction, materials, end connections and actuation to your actual service conditions.
Supplied through selected market sources. Manufacturer and model are confirmed in the quotation; SIYA is not represented as the manufacturer.
Overview
Understanding the ball valve
A ball valve uses a bored ball that rotates 90° to open or close the line. It gives fast operation, low pressure drop in full-bore form and dependable shut-off, which is why it is one of the most widely used isolation valves.
Choosing between floating and trunnion construction, soft or metal seats, and full or reduced bore depends on line size, pressure, temperature and the fluid. SIYA reviews these points with you before sourcing.
Construction options
Common 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 |
|---|---|---|
| Floating ball, 2-piece | Economical; common for smaller sizes and moderate pressure | Utility, water, air, general process |
| Floating ball, 3-piece | Body can be opened for seat and seal maintenance without removing the line | Chemical, food, frequent service |
| Trunnion-mounted | Ball supported by trunnions; lower operating torque at larger sizes and higher pressure | Pipelines, oil & gas, large bore |
| Top-entry | Internals serviced from the top while the valve stays in line | Hydrocarbon and critical lines |
| Metal-seated | For high temperature, abrasive or erosive service | Steam, slurry, catalyst |
Looking specifically for trunnion-supported ball construction? Explore trunnion-mounted ball valves
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
- Oil & gas pipelines and tank farms
- Chemical and petrochemical plants
- Water, utility and compressed-air lines
- Skids and packaged equipment
- Steam and thermal-oil (metal-seated)
- General industrial isolation
Selection checklist
What to specify
- Fluid, temperature and maximum pressure
- Full bore or reduced bore requirement
- Soft-seat limits vs. metal-seat need
- Fire-safe, anti-static or cryogenic requirement
- Manual, gear-operated or automated
- Required test standard and certificates (e.g. EN 10204 3.1)
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.