Trunnion Mounted Flanged Ball Valve Q347F with Gear operated

Product Overview

Trunnion Mounted Flanged Ball Valve Q347F with Gear operated

Material standard :

• Design & Manufacture: API 602, BS5352, ANSI B16.34

• End Connections:

  Socket‑weld per ANSI B16.11 / JB/T1751;

  Threaded per ANSI B1.20.1 / JB/T7306;

  Butt‑weld per ANSI B16.25 / JB/T12224;

  Flanged per ANSI B16.5 / JB79.

• Inspection & Testing: API 598, GB/T13927, JB/T9092

• Construction: Bolted Bonnet (B.B) OS&Y or Welded Bonnet (W.B) OS&Y

• Material Compliance: All materials follow ANSI/ASTM requirements

• Available Body Materials: A105, LF2, F11, F22, 304(L), 316(L), F347, F321, F51, Monel, Alloy 20 and more.

Working Principle of Flanged Ball Valve

A flanged ball valve achieves tight shut‑off with only a 90‑degree rotation and low operating torque.

The full‑bore inner cavity of valve body provides a straight flow path with minimum flow resistance for the medium.

Ball valves are generally applied for full‑open / full‑close service. With updated design, ball valves can also be used for throttling and flow control.

When the valve is in closed position, the ball is pressed against the seat by mechanical force from the stem.

When the handwheel is rotated counter‑clockwise, the stem moves in reverse direction. The angular flat surface at the bottom of stem lifts the ball away from valve seat to open the valve.

Structural

1. Trunnion‑mounted ball design The ball is fixed by upper and lower trunnion shafts, not floating. Pipeline pressure pushes seat rings against ball surface to achieve sealing; ball itself does not float axially.

2. Spring‑loaded floating seat Spring pre‑loaded seat rings on both sides. Springs push seat towards ball to guarantee tight sealing under low pressure; seat retracts under high‑pressure medium thrust. Double block and bleed (DBB) capability is available.

3. Flanged end connection Full flange end, bolt‑on installation, suitable for heavy‑duty high‑pressure pipeline, easy maintenance and disassembly.

4. Gearbox operation Equipped with worm‑gear operator. Reduces operating torque, enables easy manual opening & closing for large size / high‑pressure valves, no heavy force required.

5. Anti‑blow‑out stem Anti‑blow‑out stem structure prevents stem ejection under internal cavity pressure. Stem with anti‑static device, eliminating static electricity generated between ball and seats.

6. Cavity pressure relief function When medium trapped inside valve cavity heats up and pressure rises, excess pressure can push seat away from ball and relief toward pipeline side, protecting valve body.

7. Soft‑seat F sealing PTFE seat insert, bubble‑tight shut‑off performance.

Advantages

• Trunnion ball structure: low operating torque even for large size & high‑pressure working conditions. Suitable for DN100 and above big bore sizes.

• Spring‑loaded floating seat provides reliable bi‑directional tight shut‑off for both low and high pressure.

• Gear‑box operator greatly reduces manual torque, convenient for on‑site manual operation.

• Anti‑blow‑out stem & anti‑static feature improve operational safety for oil & gas flammable media.

• DBB performance available for safe isolation and cavity venting during maintenance.

• Flanged connection offers high structural strength, convenient for installation, inspection and replacement.

• Cavity self‑relief function avoids over‑pressure damage caused by medium thermal expansion inside body cavity.

• Long service life, stable performance for long‑term continuous process pipeline service.

Application & Standards

Suitable for oil, natural gas, petrochemical, power plant, pipeline transmission.

Compliance: API 6D, ASME B16.34, ASME B16.5, API 598.