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
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Instrument Single/Double Block and bleed for chemical injection and sampling
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Instrument Single/Double Block and bleed for pressure connections
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In-line Modular Single/Double Block and bleed for process isolation
Valve Design
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Floating Ball
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Trunnion Mounted Ball
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Wedge Gate
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Monoflange Needle
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Root Needle
Size
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NPS ½ to NPS 2
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DN 15 to DN 50​​
Rating
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Up to ASME 4500
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Up to API 15,000psi
Technical Features
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Pressure containing components made by solid forged materials
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Soft or Metal-to-Metal configuration
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Fire-Safe design or certification
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Anti-static design
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Optimised face to face dimension
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Engineered, manufactured, tested and optimised for your specific application
G-Blok® DBB/SBB Valves (Ball, Needle, Gate) Sizes over 2”
Applications
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In-line Modular Single/Double Block and Bleed for process isolation
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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
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Side-Entry Trunnion Mounted Ball
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Top-Entry Trunnion Mounted Ball
Size
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NPS 2½ to NPS 24
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DN 65 to DN 600
Rating
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Up to ASME 4500
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Up to API 15,000psi
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Pressure containing components made by solid forged materials
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Soft or Metal-to-Metal configuration
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Fire-Safe design or certification
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Anti-static design
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Optimised face to face, compact overall dimensions
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Engineered, manufactured, tested and optimised for your specific application
Technical Features
G-Blok® Ball Valves
Applications
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Upstream Operations: Wellhead Isolation and Christmas Tree Assemblies
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Midstream Operations: Pipeline Transportation and Gas Processing Plants
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Downstream Operations: Refineries and Petrochemical Plants
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Storage and Distribution Facilities
Valve Design
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Side-Entry Trunnion Mounted Ball
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Top-Entry Trunnion Mounted Ball
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Side-Entry Floating Ball
Size
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NPS 2½ to NPS 48
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DN 65 to DN 1200
Rating
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Up to ASME 4500
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Up to API 15,000psi
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Pressure containing components made by solid forged materials
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Soft or Metal-to-Metal configuration
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Fire-Safe design or certification
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Anti-static design
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Robust construction, quick and easy operation with low maintenance requirements
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Engineered, manufactured, tested and optimised for your specific application
Technical Features
Subsea Valves and Actuators
Applications
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Permanent subsea
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Temporary subsea
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Corrosive services
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Deep water
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Rapid cycling operating conditions over extended periods of time
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Severe conditions with no routine maintenance requirements
Valve Design
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Manual or Actuated Side-Entry Ball
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Manual or Actuated Top-Entry Ball
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Manual or Actuated DB/DBB Side-Entry Ball
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Manual or Actuated DB/DBB Top-Entry Ball
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DB/DBB Monoflange Needle
Size
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NPS ½ to NPS 48
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DN 15 to DN 1200
Rating
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Up to ASME 4500
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Up to API 15,000psi
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Pressure containing components made by solid forged materials
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Design according to API 6DSS, 17D or 6A
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Full in house testing capacity for valves, hydraulic actuators and gears (quarter turns and linear) : hyperbaric chamber, test benches, HPU and ROV tools
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Design DNV-RP-F112 with in-house FEM verification
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Full customisation for all test ports, scraper rings, high visibility letters and relief systems
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Engineered, manufactured, tested and optimised for your specific application
Technical Features
G-BlokH2 – Valves for Hydrogen Service
Applications
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High pressure hydrogen storage
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Medium/Low pressure hydrogen storage
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Hydrogen transportation
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Hydrogen distribution
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Normal temperature electrolysis skids
Valve Design
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Side-Entry Trunnion Ball
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Side-Entry Floating Ball
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Electrolysis Side-Entry Floating Ball
Size
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NPS ½ to NPS 12
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DN 15 to DN 300
Rating
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Up to ASME 2500
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Pressure containing components made by solid forged materials
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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
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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