Oil & Gas
Heat exchangers for oil and gas in the UAE: thermal equipment engineered for upstream, midstream and refining service, built and serviced in Abu Dhabi.
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Service
Valve Overhaul
Valve overhaul services in the UAE: overhaul, testing and recertification of industrial valves — restoring tight shutoff and documented reliability to plant fluid systems.
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How It Works
Valve overhaul returns each unit to as-new sealing and operation through machining-grade reconditioning and certified testing.
- 1
As-found testing records seat leakage and operation before strip-down.
- 2
Disassembly, cleaning and dimensional inspection of body, trim and stem.
- 3
Seats and discs are machined and lapped to restore sealing surfaces; stems repacked, gaskets renewed.
- 4
Reassembly with controlled torques, then hydrostatic body and seat testing to API 598.
Built to
Solve
Engineered against the specific failures that cost operators downtime, contamination or wasted energy.
Asset protection
Passing valves erode their own trim continuously — early overhaul is a service item; late overhaul is a replacement, and the gap between the two is entirely a function of inspection interval.
Process integrity
Isolation that does not isolate is a safety issue: leaking block valves undermine every permit and every maintenance task downstream that relies on that isolation holding.
Operational efficiency
Passing control and relief valves bleed product and energy invisibly, around the clock — losses that never appear on a shift log but accumulate over a full run length.
Why Dolphin Group for
Valve Overhaul
Combined-scope economics
Valves and exchangers overhauled under one mobilisation cut vendor count and window interfaces.
Certified test capability
API 598 and PSV set-pressure testing with sealed certification at Mussafah.
Machining depth in-house
Seat and body machining in our workshop rescues valves others would scrap.
Key
Benefits
What sets valve overhaul from Dolphin Group apart, in specific and measurable terms.
- 1
Verified tight shutoff
Restored tight shutoff, verified by API 598 seat testing before the valve returns to service.
- 2
Certified PSV testing
PSV testing and sealing with calibration certificates issued for every valve.
- 3
Turnaround-aligned campaigns
Campaign execution scheduled to match turnaround windows, not run as a separate mobilisation.
- 4
On-site machining
On-site machining for large-bore and welded-in valves that can't be pulled to a workshop.
- 5
As-found / as-left records
Documented as-found / as-left condition per valve, building a record for the next campaign.
- 6
One contractor, one window
One contractor for valves and exchangers in the same window, cutting coordination overhead.
Technical
Specifications
Design codes, materials and testing scope confirmed for every valve overhaul order.
Valve types
Gate · globe · check · ball · butterfly · PSV/PRV
Size range
½" to 48"+
Testing
API 598 body & seat · PSV set-pressure certification
Capability
Machining · lapping · repacking · trim replacement
Execution
Mussafah workshop · site crews · TA campaigns
Where It's
Used
Valve Overhaul in service, sector by sector, application by application.
Power & Energy
Heat exchangers for power plants in the UAE: HEI-standard condensers, coolers and heat recovery equipment for conventional and renewable generation.
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Petrochemicals
Heat exchangers for petrochemical plants in the UAE: we build exchangers and reboilers for crackers, polymer plants and aromatics complexes worldwide.
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Water & Desalination
Desalination plant heat exchangers from the UAE: we build high-alloy heat exchange equipment for MSF, MED and RO desalination plants.
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Marine & Offshore
Marine heat exchangers built in Abu Dhabi: compact, seawater-tolerant cooling systems for vessels, rigs and offshore platforms.
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Chemical Manufacturing
Heat exchangers for chemical plants in the UAE: corrosion-resistant exchangers and vessels for acids, alkalis and speciality chemistry.
View SectorFrequently Asked Questions
Gate, globe, check, ball, butterfly and pressure-relief valves from ½" to beyond 48", in carbon steel through exotic alloys.
Yes — set-pressure testing, sealing and calibration certificates per statutory requirements.
Large-bore and welded-in valves can be machined and reconditioned in place by our site crews.
Hydrostatic body test and seat-leakage test to API 598, documented per valve.
Yes — as-found and as-left condition, work performed, and test results per valve tag.
Yes — valve scope is routinely executed alongside our exchanger scope in the same window.
Yes — trim, packing and gaskets supplied or manufactured, with material certification.
Share your valve list and window dates via the RFQ form; we return scope, pricing and logistics.
Talk to an Engineer About Valve Overhaul
Send your duty requirements or existing datasheet, and our engineers will confirm the right configuration.