Forged Soft Seated Trunnion Ball Valves
CARILO soft-seated trunnion ball valves are engineered for natural gas transmission and distribution stations. A solid forged ball and trunnion-supported structure reduce operating torque, protect the soft seats and provide dependable shutoff in high-pressure pipeline service.
Available with standard DBB self-relieving SPE seats, optional DIB-1 double-piston seats and DIB-2 hybrid seats to match project isolation and cavity pressure-relief requirements.
ISO 5208 Rate A
Sizes from 2" to 42"
Features and benefits
The page focuses on CARILO’s standard and optional valve features, helping buyers evaluate safety, sealing and serviceability before sending an RFQ.
Safety-focused soft-seat trunnion design
Built on a solid forged ball and trunnion support, with field-proven sealing and emergency backup features for safe shutoff and reliable operation in demanding service.
- Anti-blowout stem design
- Cavity pressure relief
- Anti-static device
- Fire-safe design
- O-ring and gasket combination
- Emergency sealant injection system
- Trunnion-mounted ball support
Low maintenance cost
Bolted construction allows field repair, helping reduce valve downtime and avoid complete valve replacement.
Optional seat designs
DBB, DIB-1 and DIB-2 valve configurations are available for different safety and isolation requirements.
Low-emission stem sealing
Optional low-emission stem sealing supports fugitive-emission requirements for demanding service.
Three seat configurations to match your safety demand.
CARILO offers three seat configurations: standard SPE self-relieving DBB, optional DIB-1 double-piston seats, and DIB-2 hybrid seats.
Self-relieving seats
Single piston effect seats are the standard self-relieving configuration. Upstream and downstream pressure force the seat ring tightly against the ball surface to form reliable sealing.
- Automatic cavity overpressure relief
- Reliable shutoff from both pipeline directions
- Reduces cavity lock caused by medium thermal expansion
Double piston seats
Double piston effect seats feature bidirectional pressure energization, with pressure acting from upstream, downstream or the valve cavity.
- Dual independent sealing barriers
- Downstream seat can maintain tight shutoff after upstream seat failure
- Independent body relief valve is normally required
Hybrid SPE + DPE
DIB-2 combines one single piston self-relieving seat and one double piston effect seat to balance cavity pressure relief and dual isolation requirements.
- Excess cavity pressure vents through the SPE seat
- DPE seat remains tightly sealed
- Balances cavity pressure relief and isolation safety
- Size range & pressure class
- 2"–42" 150LB–2500LB
- Port bore
- Full bore or reduced bore
- End connections
- Flanged (RF, RTJ) as per ASME B16.5 & B16.47; socket welded as per ASME B16.11; butt welded as per ASME B16.25
- Valve design
- Based on API 6D standards
- Temperature range
- -20 to 392°F (-29 to 200°C)
- Face-to-face
- As per API 6D standard
- Testing & certifications
- API 6D / ISO 5208 / API 598 inspection and testing; API 607 fire-safe and fire tested; ISO 15848-2 fugitive emissions; PED 2014/68/EU
Application fit — Designed for natural gas, station isolation and industrial pressure service.
Soft seats are best suited to clean media where tight shutoff and low operating torque are priorities.
Transmission stations
For natural-gas transmission and distribution stations requiring dependable shutoff and safe isolation.
Pipeline isolation
For oil and gas pipelines where tight shutoff, pigging and ESD duties are required.
Process shutoff
For refinery and petrochemical service with clean media and controlled line isolation requirements.
Actuated packages
ISO 5211 mounting flange supports pneumatic, electric and hydraulic actuation.
API 6D
Valve design and pipeline service standard.
API 607
Fire-safe requirements for soft-seated valve design.
ISO 5208 Rate A
Bubble-tight leakage performance.
ISO 15848-2
Fugitive-emission test and production acceptance.
Materials, testing and delivery matched to your project.
Beyond the product table, here is how CARILO supports material selection, verification and on-time shipment for international pressure-service projects.
Body and trim selection
Materials vary with service media, pressure class, corrosion allowance and project temperature.
- Carbon steel, low-alloy steel or stainless steel
- Soft-seat selection for project duty
- Stem and body seals selected for media compatibility
- NACE MR0175 / ISO 15156 option for sour service
Testing and documentation
Confirm the required inspection, testing and document scope before the order is released.
- Shell and seat pressure testing
- API 6D / API 598 / ISO 5208
- Fire-safe and fugitive-emission reports when specified
- MTC, ITP, QAP and inspection records
Packaging and shipment
Export-ready packaging and valve protection support long-distance project delivery.
- Protective covers on valve openings
- Seaworthy crates for export
- Actuator locking and travel protection
- Rust prevention and desiccant protection
- Marking and nameplate traceability
Need a Forged Soft Seated valve quote for your project?
Send your valve size, pressure class, material, end connection, seat configuration, media, temperature and actuator requirement. CARILO can help confirm the right specification before quotation.
