Technical explainer
Industrial Ball Valve Types and Applications
A ball valve uses a rotating ball with a bore to open or isolate flow. Its quarter-turn action makes it widely used for shut-off duties, but body construction, ball support, bore, seats and actuation must suit the specific service.
By SNG Services · Updated 1 Oct 2026
How a ball valve controls flow
When the bore aligns with the pipeline, fluid can pass through. Rotating the stem turns the ball so the solid surface closes against the seats. Ball valves are generally selected for isolation or diversion; suitability for throttling must be established for the proposed design and duty.
Floating and trunnion-supported designs
In a floating design, the ball can move slightly under pressure to load the downstream seat. In a trunnion-supported design, the ball is mechanically supported and the seat system moves toward it. Size, pressure, operating torque and project requirements influence the design choice.
Other design choices buyers encounter
Buyers may compare full-bore and reduced-bore valves, one-piece, two-piece or three-piece bodies, forged or cast construction, and two-way or multi-port flow paths. These terms describe different aspects of the valve and should not be treated as interchangeable.
- Bore size and acceptable pressure loss
- Body construction and maintenance approach
- End connections and piping class
- Manual, geared or actuated operation
Service conditions that guide selection
Media, pressure, temperature, size, end connection, body and trim materials, seat and seal compatibility, shut-off expectation, operating frequency and actuation all matter. Project standards and inspection documents should accompany the enquiry when applicable.
Next: prepare the RFQ
How to Select an Industrial Ball Valve for an RFQ
A buyer guide for industrial ball valves covering floating, trunnion, forged, end connection, pressure class, materials and RFQ inputs.
Read the buyer guideFrequently asked questions
Are ball valves used only for water service?
No. Ball valves are used across many liquid and gas services, but materials, seats, seals and design features must be checked for each medium and operating condition.
What is the difference between full-bore and reduced-bore ball valves?
A full-bore valve has a flow passage intended to align more closely with the connected pipe bore. A reduced-bore valve has a smaller passage and may create more pressure loss.
Which information is essential for a ball valve RFQ?
State size, pressure class, end connection, bore, materials, seat and seal requirements, media, pressure, temperature, operation method, quantity and applicable project documents.