Subsea Valves

Manual & ROV Operated Solutions for Offshore Oil & Gas

Premium Subsea Valve Supply & Solutions for Deepwater Applications

Legasea Ltd stocks and sources a comprehensive range of subsea valves for offshore oil and gas operations. Our subsea valve inventory includes manually operated and ROV operated valves designed for critical deepwater applications, ensuring safe and reliable flow control in the harshest marine environments.

What Are Subsea Valves?

Subsea valves are specialised flow control devices installed on the seabed or submerged beneath fixed and floating offshore platforms. These critical components control the flow of oil, gas, water, and other production fluids in subsea production systems. Built to withstand extreme pressure, corrosive seawater, and challenging installation conditions, subsea valves are essential for safe offshore operations.

Types of Subsea Valve Operation

Manual Subsea Valves

Manual subsea valves are primarily deployed in shallow water applications where diver access is feasible.

These valves require:

Diver Operation: Qualified commercial divers using specialised tooling
Mechanical Actuation: Hand wheels, wrenches, or hydraulic torque tools
Shallow Water Applications: Typically water depths under 200 meters
Emergency Access: Backup operation when ROV systems are unavailable

ROV Operated Subsea Valves

ROV operated subsea valves are the industry standard for deepwater applications, offering:

Remote Operation: Controlled from surface vessels via ROV systems
Deepwater Capability: Suitable for ultra-deepwater installations
Enhanced Safety: Eliminates need for diver intervention
Real-time Monitoring: Integration with subsea control systems
ROV Class 4 Interface: Compatible with industry-standard ROV tooling

Comprehensive Subsea Valve Portfolio

Production System Valves

Production Header Valves

Control main production flow from subsea manifolds
High-pressure rated for production applications
Available in gate and ball valve configurations

Production Branch Valves

Individual well flow control and isolation
Critical for well intervention and maintenance
Designed for frequent operation cycles

Crossover Isolation Valves

Enable flow path switching between production lines
Essential for system flexibility and maintenance
Bidirectional flow capability

Gas Management Valves

Gas Lift System Valves

Gas Lift Header Valves: Main gas distribution control
Gas Lift Branch Valves: Individual well gas lift control
Sea Bed Gas Lift Valves: Manifold-mounted gas distribution
Gas Lift Non-Return Valves: Prevent backflow in gas lift systems

Gas Export Valves

Gas Export Riser Header Valves: Control gas flow to surface facilities
High-capacity design for large volume gas export
Integrated with riser base manifolds

Injection System Valves

Water/Chemical Injection Valves

Injection Header Valves: Main injection line control
Injection Branch Valves: Individual well injection control
Designed for continuous injection applications
Compatible with seawater, MEG, and chemical injection

Safety & Testing Valves

Subsea Safety Isolation Valves (SSIV)

Emergency shutdown capability
Fail-safe design for personnel and environmental protection
Integration with subsea safety systems
Rapid closure capability

Test System Valves

Test Header Valves: Main test line isolation
Test Branch Valves: Individual test point control
Hot Stab Isolation Valves: Quick connection testing
Enable well testing and flow assurance operations

Advanced Subsea Valve Technologies

Smart Valve Systems

Electronic Actuators: Precise position control and feedback
Condition Monitoring: Real-time valve health diagnostics
Predictive Maintenance: Advanced sensor integration
Digital Communication: Integration with subsea control networks

High-Pressure High-Temperature (HPHT) Valves

Pressure ratings up to 15,000 psi (1,034 bar)
Temperature capability up to 180°C (356°F)
Specialized metallurgy for extreme conditions
Enhanced sealing technology

Compact Valve Manifolds

Integrated multi-valve assemblies
Reduced subsea footprint
Simplified installation procedures
Consolidated control systems

Technical Specifications & Standards

Available Specifications

Sizes: 2-1/16", 5-1/8", 7-1/16", 9", 16" (51mm to 406mm)
Pressure Ratings: 345 Bar (5,000 psi) / 414 Bar (6,000 psi)
Body Material: A694 F60 carbon steel
Valve Types: Gate TC Slab, Ball Side Entry
Cladding: Inconel 625 fully clad for corrosion resistance
End Connections: Butt weld F65 with Inconel 625 clad transition pieces
Operation: Hydraulic FSO (Fail Safe Open) / Gear Actuation
ROV Interface: Class 4 ROV compatible

Industry Standards Compliance

API 6A: Wellhead and Christmas tree equipment
API 17D: Subsea production control systems
NORSOK M-001: Materials selection and corrosion control
ISO 13628: Petroleum and natural gas industries subsea equipment
ASME B16.34: Valves - flanged, threaded, and welding end

Quality Assurance & Documentation

New Equipment with OEM Documentation

All subsea valves supplied by Legasea come with:

Original Equipment Manufacturer (OEM) documentation
Material traceability certificates
Pressure test certificates
Operation and maintenance manuals
Spare parts recommendations
Warranty coverage

Factory Acceptance Testing (FAT)

Comprehensive pressure testing
Functional operation verification
ROV interface compatibility testing
Documentation package review
Client witness testing available

Applications & Industries

Offshore Oil & Gas Production

Deepwater Fields: Ultra-deepwater production systems
Marginal Fields: Cost-effective valve solutions
Brownfield Developments: Tie-back and expansion projects
Enhanced Oil Recovery: Water and gas injection systems

Subsea Processing

Subsea Separation: Manifold and separator valves
Subsea Boosting: Pump inlet and discharge isolation
Subsea Compression: Gas compression system valves
Flow Assurance: MEG and chemical injection valves

Pipeline Systems

Export Pipelines: Riser base and PLEM valves
Gathering Systems: Manifold and junction valves
Pipeline End Manifolds: Isolation and bypass valves
Pipeline Interconnection: Crossover and tie-in valves

Valve Selection & Engineering Support

Custom Valve Solutions

Application-specific design: Tailored to project requirements
Material selection: Optimized for service conditions
Actuation systems: Manual, hydraulic, or electric operation
Interface design: Compatible with existing infrastructure

Technical Support Services

Valve selection assistance: Expert recommendations
Installation planning: Rigging and deployment procedures
Commissioning support: Start-up and testing services
Maintenance programs: Planned maintenance scheduling

Global Supply Chain & Logistics

Worldwide Availability

Strategic stock locations: Key offshore hubs
Rapid deployment: Emergency valve supply
Logistics support: Transportation and handling
Local partnerships: Regional service networks

Inventory Management

Real-time stock tracking: Available inventory monitoring
Procurement services: Sourcing hard-to-find valves
Surplus valve management: Asset optimisation
Rental programs: Short-term valve solutions

Why Choose Legasea for Subsea Valves?

Extensive Inventory: Comprehensive valve types and sizes
Technical Expertise
Quality Assurance: New equipment with full documentation
Global Reach: Worldwide supply and support
Competitive Pricing: Cost-effective valve solutions
Fast Delivery: Rapid mobilisation capability
After-sales Support: Comprehensive technical assistance

Contact Legasea today for subsea valve solutions tailored to your offshore project requirements. Our experienced team will help you select the right valves for safe, reliable subsea operations.

Subsea Valve in Crate - Supplied unused by Legasea