Worm and Spur Mechanical Gearbox
Robust subsea worm-and-spur mechanical gearbox designed for reliable quarter-turn valve actuation in deep-water and offshore environments. Compact, pressure-balanced, and corrosion-resistant.
The Worm and Spur Mechanical Gearbox is a heavy-duty subsea actuation unit specifically engineered for quarter-turn valve operation in harsh offshore and deep-water environments. It utilizes either a worm or spur gear mechanism to provide precise, controlled movement for subsea ball valves, pig diverters, and similar applications. Its compact and modular design minimizes space requirements while maintaining high structural integrity and mechanical strength.
The gearbox is supplied fully integrated with its corresponding valve, reducing installation complexity and ensuring seamless performance. Its internal design is simple yet extremely robust, enhancing reliability, durability, and long service life even under extreme subsea pressure conditions.
Equipped with a pressure-balanced compensation system, redundant dynamic sealing, and an elastomeric environmental seal, the gearbox is fully protected against seawater ingress and pressure differentials. A mechanical position indicator allows for visual confirmation of valve status during operations. The unit is built to meet stringent subsea industry standards and is validated with high technology readiness for real-world offshore applications.
Main Features
- Worm or Spur design for quarter-turn operation (e.g. subsea ball valves)
- Compact, modular design engineered for minimal footprint and weight
- Robust and simple internal mechanism
- Supplied fully integrated with its corresponding valve for optimal performance and reduced installation complexity
- Pressure-Balanced design with integrated compensation system, suitable for ultra-deep installation
- ROV override interface for local subsea intervention
- Redundant sealing on all dynamic sealing areas
- Elastomeric environmental seal to prevent seawater ingress
- Local mechanical position indicator
- Design validation to API 17D / API 6A or API 6DSSX
- Proven up to Technology Readiness Level (TRL 7) with extensive subsea experience
- Long design life, maintenance-free operation
Options
- Custom design according to project requirements
- Remote position indicators: continuous transmitters and/or limit switches
- Wide selection of electrical connectors
- ROV interface available in multiple orientations
- ROV Bucket extension
- Local position indicator extension
- Diver or diverless retrievable configuration
- Mechanical clutch to aid subsea deployment (retrievable version)
- Centering and soft-landing system for safe subsea deployment (retrievable version)
- Custom Actuator Retrieval Tool (ART) interface
- Integrated handwheel for diver operation (shallow water applications)
- Drop-in manual torque tool with handwheel for diver operation (shallow water applications)
- Pressure protection cap
- ROV bucket debris protection cap
- Extended stroke capability for pig diverter applications (e.g. 120° )
- Available design
- Client specific Type Approval or Design Validation test
- PED
- Painting according to Customer Specification
Benefit
- Comprehensive range of sizes
- Fully tailored to the valve for maximum performance in a compact footprint
- Field-proven technology with a large installed base
Technical Data
Applications
Configuration
Product Range
Temperature Range
Water Depth
- Up to 3048 m (10.000 ft)
- Greater Depth upon application
Compensation System
Manual Intervention
Quality Controls
QL-1 or QL-2
PSL-3, PSL-4
Materials
Electric actuation