A trunnion-mounted ball valve supports the ball at its rotational axis rather than allowing line pressure to move it against a downstream seat. This arrangement is often considered for larger pipeline valves and duties where operating torque deserves particular attention.
Farpro’s cast steel range includes the Q347F and Q47Ni models below. Their product pages show the available construction and dimensions, making it easier to compare options for a new installation or an existing line.
Trunnion-Mounted Ball Valve Range
Q347F Trunnion-Mounted Ball Valve – Cast Steel
The Q347F is a cast steel trunnion-mounted ball valve with gear operation. The ball is supported at its rotational axis,
Trunnion Mounted Ball Valve Cast Steel – Q47Ni
Farpro Valve offers a range of trunnion mounted ball valves that are made from cast steel. These valves are designed
A Supported Ball, a Different Seat Arrangement
With the ball held in position, the seats provide the sealing contact around it. Supporting the ball changes the loads acting through the valve and can help manage operating torque as valve size and pressure increase.
That does not mean every trunnion valve has the same seats, bore or pressure rating. The model’s materials and construction remain important, particularly where temperature, corrosion or frequent operation influence the choice.
The Q347F cast steel model uses gear operation for manual isolation. If you are comparing it with a floating ball valve, start with the line conditions and how the valve will be operated, then compare the individual specifications.
About Farpro Valve Manufacturer
Farpro Valve is a large global valve manufacturer engaged in the research, development, production and sales of valves.
Our product standards include: GB/JB, API, ANSI, AWWA, DIN, JIS, GOST, NF, etc.
Our valves are available in 12 major categories, 200 series and 4000 sizes, including gate valves, globe valves, ball valves, butterfly valves, check valves, diaphragm valves, pressure reducing valves, plug valves, traps, etc.
The annual output reaches 80,000 tons. All products are widely used in petroleum, petrochemical, chemical, electric power, metallurgy, water conservancy, construction, pharmaceutical, drainage and other fields.
Our products sell well in the markets of Germany, England, France, Italy, Brazil, Poland and more than 30 countries and regions in Europe, Central Asia, West Asia, etc.