Archivi Services - NFG Negri Fratelli

Twin Ball Double Block and Bleed Trunnion Ball Valves

TWIN BALL DOUBLE BLOCK AND BLEED TRUNNION BALL VALVES

High-performance valves engineered for the oil & gas, chemical, petrochemical, water, and energy industries

Negri Fratelli Twin Ball Double Block and Bleed trunnion-mounted ball valves are designed to ensure maximum safety, reliability and ease of maintenance, even in critical or high-pressure installations. The twin ball design provides complete shut-off in both directions and allows venting of the internal cavity.

These valves are used in a wide range of applications, including pipelines, refineries, large power plants, industrial water treatment systems and process lines where operational continuity and safety are essential

Key Features

Bolted body
Full or reduced bore options

Double Block and Bleed function – twin ball design with two independent isolation points and cavity venting (through a bleed valve or plug), to drain the fluid trapped between the balls

Bi-directional sealing with Double Block & Bleed (DBB) design
Solid ball with a cylindrical bore and no internal cavities
Single-piston seats with self-relieving effect
Anti-ejection stem with antistatic device
Multiple actuation options – manual lever or gearbox (with handwheel or 90° deviation), or actuator-operated
Testing – hydrostatic and pneumatic tests to API 6D. Other testing upon request

Optional Features

Firesafe certified design – API 607 and ISO 10497 compliant
Double piston effect seats, DIB-1 / DIB-2 seats, metal-to-metal sealing
Stem and seat sealant injection systems
Drain and vent devices, complete with ball valve and/or plug, for DBB testing and maintenance
Versions for cryogenic or high-temperature service
Locking devices

Technical Specifications

Design standards: API 6D, ASME B16.34, ASME VIII DIV. 1 / 2, NACE MR0175, EN ISO 14313, EN ISO 17292
Pressure rating: ASME 150 to ASME 2500, PN 6 to PN 420
Temperature range: –29°C to +160°C (other ranges on request)
Size range: up to DN 400 (16”)
End connections: flanged, butt-welding, hub

Materials

Body and closures: in carbon and stainless steel, obtained from forging or bar stock
Ball and seat rings: ASTM A350 Gr. LF2, ASTM A479 S31600, ASTM A182 F316 (other materials on request)
Seat inserts: soft (thermoplastic polymers such as RPTFE, Devlon, Peek, or PCTFE) or metal (Tungsten/Chrome Carbide coating), other materials on request
Seals: FKM, HNBR, FFKM, EPDM, graphite, lip seals, and special high-temperature graphite seals (other materials and solutions available on request)

Certifications

Design & Construction: API 6D
Firesafe: API 607, EN ISO 10497
Pressure Equipment Directive (PED): 2014/68/EU
ATEX certification: 2014/34/EU

Twin Ball Double Block and Bleed Floating Ball Valves

TWIN BALL DOUBLE BLOCK AND BLEED FLOATING BALL VALVES

High-performance valves engineered for the oil & gas, chemical, petrochemical, water, and energy industries

Negri Fratelli Twin Ball Double Block and Bleed floating ball valves are designed to ensure maximum safety, reliability and ease of maintenance, even in critical or high-pressure installations. The twin ball design provides complete shut-off in both directions and allows venting of the internal cavity.

Key Features

Bolted or fully welded body
Full or reduced bore options

Double Block and Bleed function – twin ball design with two independent isolation points and cavity venting (through a bleed valve or plug), to drain the fluid trapped between the balls

Bi-directional sealing
Solid ball with a cylindrical bore and no internal cavities
Anti-ejection stem with antistatic device
Multiple actuation options – manual lever or gearbox (with handwheel or 90° deviation), or actuator-operated
Testing – hydrostatic and pneumatic tests to API 6D. Other testing upon request

Optional Features

Firesafe certified design – API 607 and ISO 10497 compliant
Versions for cryogenic service
Locking devices

Technical Specifications

Design standards: API 6D, ASME B16.34, ASME VIII DIV. 1 / 2, NACE MR0175, EN ISO 14313, EN ISO 17292
Pressure rating: ASME 150 to ASME 2500, PN 6 to PN 420
Temperature range: –10°C to +70°C (other ranges on request)
Size range: up to DN 250 (10”)
End connections: flanged, butt-welding, hub

Materials

Body and closures: in carbon and stainless steel, obtained from forging or bar stock
Ball: ASTM A479 S41000, ASTM A182 F6a Cl. 2, ASTM A350 Gr. LF2, ASTM A479 S31600, ASTM A182 F316 (other materials on request)
Seats: PTFE, RPTFE, Devlon, Peek, PCTFE (other materials on request)
Seals: FKM, HNBR, FFKM, EPDM, graphite, lip seals (other materials and solutions available on request)

Certifications

Design & Construction: API 6D
Firesafe: API 607, EN ISO 10497
Pressure Equipment Directive (PED): 2014/68/EU
ATEX certification: 2014/34/EU

Top Entry Trunnion Ball Valves

TOP ENTRY TRUNNION BALL VALVES

High-performance valves for oil & gas, chemical, petrochemical, water and power applications

Negri Fratelli Top Entry trunnion-mounted ball valves are designed to ensure maximum safety, reliability and ease of maintenance over time. The Top Entry configuration allows direct access to the internal components, facilitating inspection, scheduled maintenance and replacement of seats or seals without removing the valve from the line, resulting in a significant reduction in plant downtime.

These valves are used in a wide range of applications, including industrial plants, gas and fluid distribution networks, pipelines and refineries, water treatment systems and energy projects, where operational continuity and long service life are essential requirements.

Key Features

Top Entry design body
Full or reduced bore options
Bi-directional sealing with Double Block & Bleed (DBB) design
Solid ball with a cylindrical bore and no internal cavities
Single-piston seats with self-relieving effect
Anti-ejection stem with antistatic device
Multiple actuation options – manual lever or gearbox (with handwheel or 90° deviation), or actuator-operated
Testing – hydrostatic and pneumatic tests to API 6D. Other testing upon request

Optional Features

Firesafe certified design – API 607 and ISO 10497 compliant
Double piston effect seats, DIB-1 / DIB-2 seats, metal-to-metal sealing
Stem and seat sealant injection systems
Drain and vent devices, complete with ball valve and/or plug, for DBB testing and maintenance
Versions for cryogenic service
Locking devices
Customized face-to-face dimensions

Technical Specifications

Design standards: API 6D, ASME B16.34, ASME VIII DIV. 1 / 2, NACE MR0175, EN ISO 14313, EN ISO 17292
Pressure rating: ASME 150 to ASME 2500, PN 6 to PN 420
Temperature range: –29°C to +160°C (other ranges on request)
Size range: up to DN 900 (36”)
End connections: flanged, butt-welding, hub

Materials

Body and closures: in carbon and stainless steel, obtained from forging, bar stock, or casting
Ball and seat rings: ASTM A350 Gr. LF2, ASTM A479 S31600, ASTM A182 F316 (other materials on request)
Seat inserts: soft (thermoplastic polymers such as RPTFE, Devlon, Peek, or PCTFE) or metal (Tungsten/Chrome Carbide coating), other materials on request
Seals: FKM, HNBR, FFKM, EPDM, graphite, lip seals (other materials and solutions available on request)

Certifications

Design & Construction: API 6D
Firesafe: API 607, EN ISO 10497
Pressure Equipment Directive (PED): 2014/68/EU
ATEX certification: 2014/34/EU

Bolted Body Trunnion Ball Valves

BOLTED BODY TRUNNION BALL VALVES

High-performance valves engineered for the oil & gas, chemical, petrochemical, water, and energy industries

Negri Fratelli bolted body trunnion-mounted ball valves are designed to deliver maximum safety, reliability, and long-term ease of maintenance. The bolted body design provides direct access to internal components, simplifying inspections, scheduled maintenance, and seat or seal replacement without compromising the valve’s structural integrity.

Ideal for a wide range of applications, including industrial plants, gas and fluid distribution networks, pipelines and refineries, water treatment systems, and energy projects.

Key Features

Bolted body
Full or reduced bore options
Bi-directional sealing with Double Block & Bleed (DBB) design
Solid ball with a cylindrical bore and no internal cavities
Single-piston seats with self-relieving effect
Anti-ejection stem with antistatic device
Multiple actuation options – manual lever or gearbox (with handwheel or 90° deviation), or actuator-operated
Testing – hydrostatic and pneumatic tests to API 6D, EN 13774, EN 14141. Other testing upon request

Optional Features

Firesafe certified design – API 607 and ISO 10497 compliant
Double piston effect seats, DIB-1 / DIB-2 seats, Primary Metal Secondary Soft (PMSS) or metal-to-metalsealing
Stem and seat sealant injection systems
Drain and vent devices, complete with ball valve and/or plug, for DBB testing and maintenance
Versions for cryogenic or high-temperature service
Locking devices
Customized face-to-face dimensions

Technical Specifications

Design standards: API 6D, ASME B16.34, ASME VIII DIV. 1 / 2, NACE MR0175, EN 13774, EN 14141, EN ISO 14313, EN 13942, EN ISO 17292
Pressure rating: ASME 150 to ASME 2500, PN 6 to PN 420
Temperature range: –29°C to +160°C (other ranges on request)
Size range: up to DN 900 (36”)
End connections: flanged, butt-welding, hub

Materials

Body and closures: in carbon and stainless steel, obtained from forging or bar stock
Ball and seat rings: ASTM A350 Gr. LF2, ASTM A479 S31600, ASTM A182 F316 (other materials on request)
Seat inserts: soft (delta ring in FKM, HNBR, or thermoplastic polymers such as RPTFE, Devlon, Peek, or PCTFE) or metal (Tungsten/Chrome Carbide coating), other materials on request
Seals: FKM, HNBR, FFKM, EPDM, graphite, lip seals, and special high-temperature graphite seals (other materials and solutions available on request)

Certifications

Design & Construction: API 6D
Firesafe: API 607, EN ISO 10497
Pressure Equipment Directive (PED): 2014/68/EU
ATEX certification: 2014/34/EU

Bolted Body Floating Ball Valves

BOLTED BODY FLOATING BALL VALVES

High-performance valves engineered for the oil & gas, chemical, petrochemical, water, and energy industries

Negri Fratelli bolted body floating ball valves are designed to deliver maximum safety, reliability, and long-term ease of maintenance. The bolted body design provides direct access to internal components, simplifying inspections, scheduled maintenance, and seat or seal replacement without compromising the valve’s structural integrity.

Ideal for a wide range of applications, including industrial plants, gas and fluid distribution networks, pipelines and refineries, water treatment systems, and energy projects.

Key Features

Bolted body
Full or reduced bore options
Bi-directional sealing
Solid ball with a cylindrical bore and no internal cavities
Anti-ejection stem with antistatic device
Multiple actuation options – manual lever or gearbox (with handwheel or 90° deviation), or actuator-operated
Testing – hydrostatic and pneumatic tests to API 6D, EN 13774, EN 14141. Other testing upon request

Optional Features

Firesafe certified design – API 607 and ISO 10497 compliant
Versions for cryogenic service
Locking devices
Customized face-to-face dimensions

Technical Specifications

Design standards: API 6D, ASME B16.34, ASME VIII DIV. 1 / 2, NACE MR0175, EN 13774, EN 14141, EN ISO 14313, EN 13942, EN ISO 17292
Pressure rating: ASME 150 to ASME 2500, PN 6 to PN 420
Temperature range: –10°C to +70°C (other ranges on request)
Size range: up to DN 250 (10”)
End connections: flanged and butt-welding

Materials

Body and closures: in carbon and stainless steel, obtained from forging or bar stock
Ball: ASTM A479 S41000, ASTM A182 F6a Cl. 2, ASTM A350 Gr. LF2, ASTM A479 S31600, ASTM A182 F316 (other materials on request)
Seats: PTFE, RPTFE, Devlon, Peek, PCTFE (other materials on request)
Seals: FKM, HNBR, FFKM, EPDM, graphite, lip seals (other materials and solutions available on request)

Certifications

Design & Construction: API 6D
Firesafe: API 607, EN ISO 10497
Pressure Equipment Directive (PED): 2014/68/EU
ATEX certification: 2014/34/EU

Fully Welded Trunnion

Valvole a Sfera Trunnion Totalmente Saldate

FULLY WELDED TRUNNION BALL VALVES

High-performance valves for oil & gas, water, and energy applications

Negri Fratelli fully welded trunnion ball valves are designed for maximum safety, reliability, and long-term performance. Their fully welded construction eliminates leaks and minimizes maintenance, making them ideal for both buried and above-ground installations.

These valves are suitable for a wide range of applications, including gas and hydrogen distribution and transmission pipelines, compressor and measuring stations, gas storage facilities, industrial plants, and district heating networks.

Key Features

Fully welded body
Full or reduced bore options
Bi-directional sealing with Double Block & Bleed (DBB) design
Solid ball with a cylindrical bore and no internal cavities
Single-piston seats with self-relieving effect
Anti-ejection stem
Multiple actuation options – manual lever, square or gearbox (removable or fixed, with handwheel or 90° deviation), or actuator-operated
Testing – hydrostatic and pneumatic tests to API 6D, EN 13774, EN 14141. Other testing upon request

Optional Features

Firesafe certified design – API 607 and ISO 10497 compliant
Antistatic device
Double piston effect seats, DIB-1 / DIB-2 seats, Primary Metal Secondary Soft (PMSS) or metal-to-metal sealing
Stem and seat sealant injection systems
Drain and vent devices, complete with ball valve and/or plug, for DBB testing and maintenance
Stem extensions – fixed, adjustable, or telescopic for underground use
Pipeline vent devices, complete with pre-assembled vent ball valves
Locking devices
Custom pup pieces or specified end-to-end dimensions
Pre-installed polyethylene ends

Technical Specifications

Design standards: API 6D, ASME B16.34, ASME VIII DIV. 1 / 2, NACE MR0175, EN 13774, EN 14141, EN ISO 14313, EN 13942, EN ISO 17292
Pressure rating: ASME 150 to ASME 2500, PN 6 to PN 420
Temperature range: –10°C to +70°C (other ranges on request)
Size range: up to DN 900 (36”)
End connections: Butt-welding, flanged, socket-welding, threaded, or mixed types

Materials

Body and closures: carbon steel, obtained from forging, bar stock, or pipe
Ball and seat rings: standard ASTM A350 Gr. LF2, other materials on request
Seat inserts: soft (delta ring in FKM, HNBR, or thermoplastic polymers such as RPTFE, Devlon, or Peek) or metal (Tungsten/Chrome Carbide coating), other materials on request
Seals: FKM, HNBR, FFKM, EPDM, graphite (other materials and solutions on request)

Certifications

Design & Construction: API 6D, EN 13774
Firesafe: API 607, EN ISO 10497
Pressure Equipment Directive (PED): 2014/68/EU
ATEX certification: 2014/34/EU

Fully Welded Floating Ball Valves

Valvole a Sfera Flottante Totalmente Saldate

FULLY WELDED FLOATING BALL VALVES

High-performance valves for oil & gas, water, and energy applications

Negri Fratelli fully welded floating ball valves are designed for maximum safety, reliability, and long-term performance. Their fully welded construction eliminates leaks and minimizes maintenance, making them ideal for both buried and above-ground installations.

Key Features

Fully welded body
Full or reduced bore options
Bi-directional sealing
Solid ball with a cylindrical bore and no internal cavities
Anti-ejection stem
Multiple actuation options – manual lever, square or gearbox (removable or fixed, with handwheel or 90° deviation), or actuator-operated
Testing – hydrostatic and pneumatic tests to API 6D, EN 13774, EN 14141. Other testing upon request

Optional Features

Firesafe certified design – API 607 and ISO 10497 compliant
Antistatic device
Stem extensions – fixed, adjustable, or telescopic for underground use
Pipeline vent devices, complete with pre-assembled vent ball valves
Locking devices
Custom pup pieces or specified end-to-end dimensions
Pre-installed polyethylene ends

Technical Specifications

Design standards: API 6D, ASME B16.34, ASME VIII DIV. 1 / 2, NACE MR0175, EN 13774, EN 14141, EN ISO 14313, EN 13942, EN ISO 17292
Pressure rating: ASME 150 to ASME 2500, PN 6 to PN 420
Temperature range: –10°C to +70°C (other ranges on request)
Size range: up to DN 250 (10”)
End connections: Butt-welding, flanged, socket-welding, threaded, or mixed types

Materials

Body and closures: carbon steel, obtained from forging, bar stock, or pipe
Ball: standard ASTM A182 F6a or ASTM A350 Gr. LF2, other materials on request
Seats: PTFE, RPTFE, Devlon, or Peek; other materials on request
Seals: FKM, HNBR, FFKM, EPDM, graphite (other materials and solutions on request)

Certifications

Design & Construction: API 6D, EN 13774
Firesafe: API 607, EN ISO 10497
Pressure Equipment Directive (PED): 2014/68/EU
ATEX certification: 2014/34/EU