Forged Trunnion Ball Valve

Applicable Standards

Basic Design: API 6D, ISO 17292, BS 5351, API 608

Face to Face: ASME B16.10

Flange End: ASME B16.5

Butt Welding End: ASME B16.5

Test and Inspection: API 598

Fire-safe Test: API 607 / API 6FA

Fugitive Emission Test: ISO 15848-2

Pressure & Temp.: ASME B16.34

Sour: NACE MR 0175

Seat To Ball Sealing

Soft seats are standard. Seat inserts made of RTFE, Devlon, or PEEK are installed within a one-piece metal seat ring. At low or zero line pressure, seat springs ensure sealing between the ball and seats—an important performance characteristic of a forged trunnion ball valve.

Self Relieving Seat

This standard feature automatically relieves excessive body cavity pressure once it exceeds 133% of the pressure rating, protecting the integrity of the forged steel trunnion ball valve. A double piston seat option is also available for enhanced sealing performance.

Seat To Body Sealing

Two different types of seals are used to isolate the line pressure from the body cavity. Primary sealing is accomplished by an elastomeric seal such as Viton or HNBR, and secondary firesafe sealing is accomplished by a graphite seal ring. This design provides high-quality industrial valve solutions.

Sealant Injection Fittings

If the seat ring becomes damaged, this feature provides the user with an easy way to inject an emergency sealant to restore a tight seal. It also allows for the sealing surfaces of the ball and seat to be periodically flushed to clear away debris which may impair sealing.

Stem Sealing and Sealant Injection Fitting

ASME Class 150 through 2500 utilize two “O” Rings and a graphite seal ring to effect a tight stem to body seal. In case of damage to the soft seals, stem seal integrity can be restored by injecting sealant into the sealant injection fitting, ensuring continuous ball valve operation.

Double Block and Bleed

KFTE forged trunnion ball valves incorporate an independent positive seal at both the upstream and downstream ends. In the fully closed position, the body cavity is isolated from upstream/downstream pressure. The body cavity may be vented by use of the body bleed plug to confirm the integrity of the seats.