Description

Technical Data Sheet – Cast 2-Piece Trunnion Ball Valve

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1. Product Overview

• Product Name: Cast 2-Piece Trunnion Mounted Ball Valve

• Valve Type: Trunnion Ball Valve (Fixed Ball Design)

• Design Standard: API 6D / ASME B16.34

• Body Construction: 2-Piece Split Body, Bolted Connection

• Ball Support: Trunnion Mounted (Fixed Ball) with Double Bearings

• Operation: Manual / Gear / Actuator (as required)

• Connection Type: Flanged Ends (RF or RTJ) / Butt Welding Ends

• Body Material: Cast Steel (WCB, CF8, CF8M, etc.)

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2. Applicable Standards & Specifications

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3. Basic Technical Parameters

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4. Main Materials of Parts

Note: Materials vary based on service conditions. Typical configurations shown below.

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5. 2-Piece Trunnion Ball Valve Design Features

5.1 Body Construction

• 2-Piece Split Body: Valve consists of main body and body connector (bonnet) joined by bolted connections .

• Bolted Construction: Allows for easy maintenance and access to internal components .

• Full or Reduced Bore: Available in both designs per API 6D requirements .

5.2 Trunnion Mounted Ball

• Fixed Ball Design: Ball is supported by upper and lower trunnions (stems) with bearings, preventing ball movement under pressure .

• Lower Operating Torque: Bearings reduce friction, making operation easier especially in high pressure classes .

• Suitable for High Pressure/Large Size: Ideal for Class 600 and above, and sizes above NPS 4″ .

5.3 Seat Design

• Floating Seats: Seats are spring-loaded or pressure-assisted to move and maintain contact with the ball .

• Dual Piston / Single Piston Seats: Options for DBB (Double Block and Bleed) and DIB (Double Isolation and Bleed) configurations .

• Soft Seat: PTFE, Nylon, PEEK for bubble-tight shut-off .

• Metal Seat: Hardfaced (Stellite, Carbide) for high temperature and erosive services .

5.4 Stem Design

• Anti-Blowout Stem: Integral shoulder prevents stem ejection under pressure .

• Live-Loaded Packing: Optional disc spring loading for low emission compliance .

• Anti-Static Device: Ensures electrical continuity between ball, stem, and body .

5.5 Additional Features

• Double Block and Bleed (DBB): Capable of sealing against pressure from both ends and allowing cavity bleed .

• Fire Safe Design: Meets API 607 / API 6FA requirements .

• Cavity Pressure Relief: Automatic pressure relief from body cavity (optional) .

• Sealant Injection: Emergency sealant injection fitting available for seats and stem .

• Drain and Vent: Body equipped with drain/vent ports (plugged) .

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6. Dimensional Data (Class 150 – Flanged RF)

Note: Dimensions for reference only. Final dimensions per manufacturer’s drawing.

For Class 300, 600, 900, 1500, 2500 dimensions, refer to ASME B16.10 or manufacturer’s catalog.

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7. Inspection & Testing

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8. Applications

• Industry Sectors: Oil & Gas (upstream/downstream), Petrochemical, Refinery, Chemical, Power Generation, Pipeline Transmission

• Typical Media: Crude oil, natural gas, refined products, water, steam, corrosive chemicals

• Service Conditions: High pressure, high temperature, cryogenic, sour service, erosive service

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Remarks:

• This data sheet covers cast 2-piece trunnion ball valves. For forged construction, please request separate data sheet.

• Actuator mounting details (ISO 5211) available upon request.

• Extended bonnet for cryogenic service available.

• Double piston seat (DIB-1, DIB-2) configurations available per API 6D