Trunnion Ball Valve

Technical Summary

Nominal Size: 2” to 48”

Pressure Class: Class 150 to Class 2500

Temperature Range: -29°C to 450°C

Design Standards: API 6D, ASME B16.34

Face to Face: ASME B16.10

Fire Safe: API 607, API 6FA

Inspection and Testing: API 598, API 6D

Construction and Materials

Body and Pressure Retaining Parts

• ASTM A105
• ASTM A216 WCB
• ASTM A351 CF8M
• ASTM A182 F51

Internal Components

• Ball: ASTM A105, ASTM A351 CF8M, ASTM A182 F51
• Stem: ASTM A182 F6a, ASTM A182 F316
• Trunnion: Alloy Steel / Stainless Steel

Sealing System

• Seat: Metal seated / Soft seated
• Gasket: Graphite / Spiral wound
• Packing: Graphite

Functional Design

Trunnion Ball Valve uses a fixed ball design supported by trunnions at the top and bottom. The ball remains stationary while the seats move towards the ball under pressure, ensuring reliable sealing.

This design reduces operating torque and provides stable performance in high pressure and large diameter applications. It is suitable for critical isolation where tight shut-off and long service life are required.

Material and Grade

Standard Materials

Component	Material	Grade	Typical Application
Body	Carbon Steel	ASTM A216 WCB	General industrial and high-pressure service
Body	Stainless Steel	ASTM A351 CF8M	Corrosive and chemical environments
Body	Duplex Stainless Steel	ASTM A182 F51	Offshore and chloride environments
Ball	Stainless Steel	ASTM A351 CF8M	Corrosion resistance and durability
Stem	Stainless Steel	ASTM A182 F6a / F316	High strength and torque transmission
Trunnion	Alloy Steel / Stainless Steel	ASTM A182 F6a	Load bearing and pressure stability

Extended Materials (On Request)

• Alloy 20 (CN7M) for acidic environments
• Super Duplex (F53 / F55) for high strength and corrosion resistance
• Hastelloy C276 for aggressive chemical service
• Inconel 625 / 718 for high temperature and pressure conditions
• Titanium Grade 2 / Grade 5 for seawater and marine applications

Additional Information

Valve Type	Trunnion Mounted Ball Valve
Mounting	ISO 5211 direct mounting pad
Operation	Manual, Electric Actuated, Pneumatic Actuated
Body Construction	Two-piece / Three-piece / Fully Welded
Port Configuration	Full Bore / Reduced Bore
Seat Design	Spring loaded seats for bidirectional sealing

End Connections

• Flanged as per ASME B16.5 and ASME B16.47
• Butt weld as per ASME B16.25

Applications

• Oil and gas industry: transmission pipelines and high pressure isolation
• Petrochemical industry: handling of hydrocarbons and process fluids
• Power generation: high pressure steam and utility systems
• Chemical processing: corrosive and hazardous media control
• Offshore and subsea: high integrity isolation in offshore installations
• Pipeline networks: long distance fluid transmission systems