In-House Valve Modification
Fast, fully certified valve modifications including trim changes, material upgrades, welding, end connections, and project-specific configurations.
ACV provides fast, reliable, in-house valve modification services backed by one of Europe’s most comprehensive valve stock ranges and a dedicated inventory of critical spares. Our engineering team carries out a wide range of modifications—including trim changes, material upgrades, welding, overlays, extended stems, end-connection changes, automation preparation, and special testing—ensuring every valve is built exactly to your project specification.
All work is completed in our UK facilities under strict quality control, with full certification, traceability, and documentation. Whether you need urgent replacements, specialist materials, or bespoke configurations, we can modify from stocked valves or source additional components through our global supply network to keep your project moving without delay.
With over 25 years of engineering experience, we help you avoid long factory lead times, meet unique service requirements, and receive valves that are correctly configured, fully tested, and ready for immediate installation.
Benefits we provide
- Fast-track valve modifications carried out in-house for rapid turnaround
- Enhanced performance solutions including trim changes, material upgrades, and configuration adjustments
- European-sourced components with full traceability for critical applications
- Modified valves supplied to recognised international standards for assured reliability
Support we offer
- Technical evaluation to identify the optimal modification for your application
- Stem extensions, locking devices, gearbox changes, mounting kits, and custom actuation interfaces
- High-temperature, cryogenic, and severe-service preparation
- Inspection, testing, and witness testing following all modifications
- Project documentation, certification updates, and customer-specific formats
- Spare parts sourcing and long-term lifecycle support for modified valves
Industries we work with
- Oil and gas
- Hydrogen
- Carbon capture
- Power generation
- Energy storage
- General process
- Water
- Steel
- Chemical
- Petrochemical
Valve Modification Team
Richard Clapp
Technical Valve Services Director
Sudhir Jaycee
Workshop Manager
Jamie Bartlett
Workshop Supervisor
Dave Papworth
Design Engineer
Anees Diwan
Junior Design Engineer
Robert Marshall
Machinist
Justin Cornwall
Machinist
Lukasz Popielnicki
Machinist
Daniel Stothard
Valve & Actuation Fitting & Testing
Jacob Baines
Apprentice Fitter
Thomas Uwins
Engineering Apprentice
Case study
- Four 24” Class 600 Perar trunnion-mounted ball valves pulled from stock
- Valves machined from general-ended to raised-face configuration
- Installation optimised at a 90° orientation to maintain gearbox height requirements
- Integration of Galli & Cassina plug valves on vent and drain ports
- V8 injection valves installed on stem and seat sealant points
- All components positioned at precise operational angles
- Valves painted to client specification for final delivery
- Project delivered on time, meeting all performance and site requirements
See how we do it
Our Process
Our valve modification process delivers engineered solutions that adapt existing valves to specific project or operational requirements. Each stage is controlled, traceable, and carried out by skilled technicians to ensure performance, compliance, and long-term reliability.
Application & Requirement Review
We assess the valve’s intended service, media, temperature, pressure class, materials, and any project constraints. This defines the modification scope and ensures complete alignment with customer and industry requirements.
Valve Inspection & Preparation
Incoming valves are cleaned, visually inspected, and fully verified against documentation. Dimensional checks, material traceability, and component condition assessments ensure suitability for modification.
Machining & Adaptation
Precision CNC machining is carried out to produce components such as adapter plates, brackets, stem extensions, drilled/tapped features, and interface parts. All machining is performed to tight tolerances to ensure seamless integration.
Trim Adjustments & Component Changes
Internal components, such as seats, seals, stems, or balls/plugs, are replaced or upgraded where required. All replacements follow controlled work instructions to maintain performance and compatibility with service conditions.
Cleaning & Specialist Processes
Where applicable, valves undergo controlled procedures such as degreasing, oxygen cleaning, or high-purity preparation to meet project or industry-specific requirements.
Assembly & Build
Valves are reassembled to the required configuration using new or modified components. All assemblies are built following approved procedures to ensure functional reliability and traceability.
Testing & Validation
Modified valves are hydrostatically, pneumatically, and functionally tested in accordance with applicable standards. Testing verifies that all changes meet the required performance, sealing, and operational criteria.
Coating & Finishing
External surfaces are cleaned and recoated as required to ensure corrosion protection and suitability for the intended environment.
Final Inspection
Every valve undergoes a final inspection to confirm dimensional accuracy, operational performance, and compliance with specifications. Documentation, serialisation, and traceability records are updated accordingly.
Packing & Dispatch
Valves are securely packed, labelled, and supplied with all supporting test records, certificates, and documentation to ensure seamless integration into project systems.
Valve modification services
Valve Stock & Supply
Valve Automation
Valve Testing
Project Supply
Resources
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Yes. We can provide high-pressure gas testing, helium leak testing and other specialist procedures for valves used in critical, high-integrity, or cryogenic applications. These tests are performed using dedicated equipment and documented to meet stringent industry and customer standards.