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High-pressure pipeline isolation demands a valve design that delivers consistent shut-off, low operating torque, and long service life without compromise. ValvesOnly Canada has established itself as one of the leading Trunnion Ball Valve Manufacturer in Canada, producing precision-engineered trunnion mounted ball valves for oil and gas, petrochemical, power generation, and offshore industries across domestic and international markets. Trunnion Ball Valve Design and How it Works? A trunnion ball valve keeps the ball fixed in position using mechanical supports at the top and bottom of the valve body. Unlike a floating ball design where the ball moves under pressure, spring-loaded seats travel toward the stationary ball to create the seal. This reduces operating torque significantly, delivers consistent sealing across varying pressure conditions, and extends service life in large-diameter and high-pressure applications where floating ball designs wear prematurely. Body Construction and Port Configurations: Two-Piece Body – Accessible construction for maintenance in above-ground pipeline service Three-Piece Body – Full in-line maintenance without removing the valve from the pipeline Fully Welded Body – Designed for buried pipeline and long-term service Full Bore – Unrestricted flow path for pigging and low pressure drop applications Reduced Bore – Compact body envelope where space and weight are considerations Spring Loaded Seats – Bidirectional sealing for both upstream and downstream isolation Dimensional Range and Performance Data: Nominal Size – 2 inch to 48 inch ASME Pressure Classes – Class 150, 300, 600, 900, 1500, and 2500 Temperature Range – Minus 29 degrees C to 450 degrees C Face to Face – ASME B16.10 End Connections – Flanged to ASME B16.5 and B16.47, Butt Weld to ASME B16.25 Mounting – ISO 5211 direct mounting pad Operation – Manual, Electric, and Pneumatic Actuated Fire Safe – API 607 and API 6FA Applicable Codes and Inspection Requirements: Design standards include API 6D and ASME B16.34. Testing is carried out to API 598 and API 6D protocols. Fire-safe testing is performed to API 607 and API 6FA. Construction Materials and Component Grades: Body and pressure retaining parts: Carbon Steel (ASTM A216 WCB / A105) – General industrial and high-pressure pipeline service Stainless Steel (ASTM A351 CF8M) – Corrosive and chemical process environments Duplex Stainless Steel (ASTM A182 F51) – Offshore and chloride-bearing environments Internal components: Ball – A105, CF8M, or F51 based on service conditions Stem – ASTM A182 F6a or F316 for strength and torque transmission Trunnion – Alloy steel or stainless steel for load bearing and pressure stability Seats – Metal seated or soft seated based on shut-off requirements Packing and Gaskets – Graphite packing with spiral wound or graphite gaskets Extended materials on request: Alloy 20, Super Duplex F53/F55, Hastelloy C276, Inconel 625/718, and Titanium Grade 2/Grade 5. Pipeline and Process Applications: Oil and gas transmission pipelines requiring high-integrity isolation Offshore and subsea installations where valve reliability affects production safety Power generation systems with high-pressure steam and utility service Petrochemical plants handling hydrocarbons and corrosive process fluids Chemical processing facilities with hazardous media When Trunnion Design is the Correct Choice? In sizes above 4 inch and pressure classes above Class 300, the torque required to rotate a floating ball under full system pressure becomes impractical and places excessive stress on seats and ball surfaces. The trunnion design eliminates this entirely. For critical isolation in transmission pipelines and offshore systems, trunnion valves with the right seat configuration also provide double block and bleed capability, confirming isolation on both sides with a bleed point between seats. Valves Only Canada manufactures trunnion ball valves across major body constructions, pressure classes, and material grades, supported by fire-safe certification, API 6D compliance, and complete documentation on every order. As a well known Pipeline Ball Valve Manufacturer, the company delivers engineered valve solutions designed for reliable shut-off performance in high-pressure transmission and process systems. Visit us : https://www.valvesonlycanada.com/product/trunnion-ball-valve/
