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G-BLOK® Valves

AFF, as part of the Galperti Group, manufactures the G-Blok® Double Block & Bleed (DBB) valves, specifically designed to provide precision isolation to sections of pipelines, process systems, and instrumentation to safeguard your operations and guarantee efficiency. 

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Galperti Engineering G-Blok® range of standard and special valves includes double block and bleed valves, API valves and slimline compact monoflanges.

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Specific for oil and gas, petrochemical and power generation industry, G-Blok® valves are custom designed to fulfill project applications and specifications: for pipeline or instrumentation, topside or subsea/deep sea, high or low temperature, corrosive or hazardous fluids.

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G-Blok® DBB/SBB Valves (Ball, Needle, Gate) Sizes up to 2”
 
Applications
  • Instrument Single/Double Block and bleed for chemical injection and sampling

  • Instrument Single/Double Block and bleed for pressure connections

  • In-line Modular Single/Double Block and bleed for process isolation

Valve Design
  • Floating Ball

  • Trunnion Mounted Ball

  • Wedge Gate

  • Monoflange Needle

  • Root Needle

Size
  • NPS ½ to NPS 2

  • DN 15 to DN 50​​

Rating
  • Up to ASME 4500

  • Up to API 15,000psi

Technical Features
 
  • Pressure containing components made by solid forged materials

  • Soft or Metal-to-Metal configuration

  • Fire-Safe design or certification

  • Anti-static design

  • Optimised face to face dimension

  • Engineered, manufactured, tested and optimised for your specific application

AFF Integral DBB Ball Valve

G-Blok® DBB/SBB Valves (Ball, Needle, Gate) Sizes over 2”
 
Applications
  • In-line Modular Single/Double Block and Bleed for process isolation

  • Best design option in offshore environment to reduce weight, space requirements and leak paths by integrating as many valves as possible into a single product

Valve Design
  • Side-Entry Trunnion Mounted Ball

  • Top-Entry Trunnion Mounted Ball

Size
  • NPS 2½ to NPS 24

  • DN 65 to DN 600

Rating
  • Up to ASME 4500

  • Up to API 15,000psi

  • Pressure containing components made by solid forged materials

  • Soft or Metal-to-Metal configuration

  • Fire-Safe design or certification

  • Anti-static design

  • Optimised face to face, compact overall dimensions

  • Engineered, manufactured, tested and optimised for your specific application

Side Entry Trunnion Ball Valve
Technical Features
 

G-Blok® Ball Valves 
 
Applications
  • Upstream Operations: Wellhead Isolation and Christmas Tree Assemblies

  • Midstream Operations: Pipeline Transportation and Gas Processing Plants

  • Downstream Operations: Refineries and Petrochemical Plants

  • Storage and Distribution Facilities

Valve Design
  • Side-Entry Trunnion Mounted Ball

  • Top-Entry Trunnion Mounted Ball

  • Side-Entry Floating Ball

Size
  • NPS 2½ to NPS 48

  • DN 65 to DN 1200

Rating
  • Up to ASME 4500

  • Up to API 15,000psi

  • Pressure containing components made by solid forged materials

  • Soft or Metal-to-Metal configuration

  • Fire-Safe design or certification

  • Anti-static design

  • Robust construction, quick and easy operation with low maintenance requirements

  • Engineered, manufactured, tested and optimised for your specific application

Side Entry Trunnion Ball Valve
Technical Features
 

Subsea Valves and Actuators
 
Applications
  • Permanent subsea

  • Temporary subsea

  • Corrosive services

  • Deep water

  • Rapid cycling operating conditions over extended periods of time

  • Severe conditions with no routine maintenance requirements

Valve Design
  • Manual or Actuated Side-Entry Ball

  • Manual or Actuated Top-Entry Ball

  • Manual or Actuated DB/DBB Side-Entry Ball

  • Manual or Actuated DB/DBB Top-Entry Ball

  • DB/DBB Monoflange Needle

Size
  • NPS ½ to NPS 48

  • DN 15 to DN 1200

Rating
  • Up to ASME 4500

  • Up to API 15,000psi

  • Pressure containing components made by solid forged materials

  • Design according to API 6DSS, 17D or 6A

  • Full in house testing capacity for valves, hydraulic actuators and gears (quarter turns and linear) : hyperbaric chamber, test benches, HPU and ROV tools

  • Design DNV-RP-F112 with in-house FEM verification

  • Full customisation for all test ports, scraper rings, high visibility letters and relief systems

  • Engineered, manufactured, tested and optimised for your specific application

Actuated Subsea Ball Valves
Technical Features
 

G-BlokH2 – Valves for Hydrogen Service
 
Applications
  • High pressure hydrogen storage

  • Medium/Low pressure hydrogen storage

  • Hydrogen transportation

  • Hydrogen distribution

  • Normal temperature electrolysis skids

Valve Design
  • Side-Entry Trunnion Ball

  • Side-Entry Floating Ball

  • Electrolysis Side-Entry Floating Ball

Size
  • NPS ½ to NPS 12

  • DN 15 to DN 300

Rating
  • Up to ASME 2500

  • Pressure containing components made by solid forged materials

  • Double seal configuration for all leak paths.
    Primary static seals metal to metal type: Galperti metal self energised seal ring GCCP type, Xylan 1070 coated. 
    Secondary seals: graphite die formed rings

  • Redundant anti-static devices with all anti-static springs with base material UNS S31603, low stress design

  • Lip seals and V-packs with UNS S31603 springs
    Seat leak test and fugitive emission test available in-house with blend of nitrogen (95%) and hydrogen (5%)

  • Engineered, manufactured, tested and optimised for your specific application

Hydrogen Service Valve
Technical Features
 
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