Identify & tag
Record the valve location, orientation, service and identification before removal.
Naude Industries / Mechanical / Valve Services
Marine & industrial valve servicesOverhauled. Tested. Ready for service.
Valve removal, identification, workshop overhaul, component inspection, pressure testing and controlled reinstatement-matched to the valve, service conditions and agreed requirements.
Remove & identifyControlled tagging and workshop transfer
Strip & inspectBody, seat, disc, spindle and bonnet
Pressure testNormally 3-5 bar, subject to requirements
Reinstall & hand overAgreed records and completion evidence
A controlled workshop process
Every valve has a service history.
A valve overhaul must address the condition of the working components-not simply the external appearance.
Naude Industries can remove and identify valves onboard, complete the agreed workshop overhaul, assess sealing and operating components, pressure test the reassembled valve and return it for controlled reinstatement.
Gate valves
Globe valves
SDNR & non-return valves
Butterfly valves
Marine bilge valves
Sea-water service valves
Industrial process valves
Emergency valve work
Typical overhaul sequence
From onboard removal to handover.
The final work method, repair actions, test pressure and witnessing requirements are confirmed for the individual valve and project.
Remove
Isolate, disconnect and transfer the valve to the workshop within the agreed access scope.
Strip
Dismantle the body, bonnet, spindle, disc or gate, gland and sealing components.
Clean & inspect
Remove deposits and assess corrosion, wear, damage and sealing-surface condition.
Repair
Complete agreed seat, disc, spindle, packing, fastener and component repairs.
Reassemble
Rebuild the valve with renewed consumable sealing materials where included.
Pressure test
Test to the agreed pressure and acceptance criteria before release from the workshop.
Reinstall & record
Return, reinstall, complete agreed operational checks and provide handover evidence.
Bilge-valve inspection evidence
Strip, identify and assess every component.
Workshop records help connect the observed condition to the repair decision and the final scope completed.
Evidence before assumptions.
These project photographs show DN100 and DN125 bilge-valve components recorded during workshop assessment. Identifying each valve and inspecting the body, seat, gate or disc, spindle, bonnet and packing arrangement supports a more accurate repair decision and traceable handover.
Workshop pressure testing
Tested to the agreed requirement.
Pressure testing forms part of confirming the condition of the reassembled valve. The required pressure, medium, duration, acceptance criteria and witnessing arrangements are agreed before testing.
Normally 3-5 barSubject to the applicable classification-society requirements, valve duty and agreed project scope. Valves can also be tested to the client’s specified pressure and acceptance criteria.
Test results and supporting photographs can be included in the project handover records where required.
Discuss a valve test scope →Valve overhaul capability
A defined scope from removal to return.
The agreed scope is matched to the valve type, size, service, condition, location and access constraints. Repairs that only become visible after stripping are recorded and addressed through the agreed project process.
Removal & taggingLocation, orientation and identification controlled before transfer
Workshop overhaulStrip, clean, inspect, repair and reassemble
Sealing componentsSeats, discs, gates, packing and gaskets by scope
Operating componentsSpindles, followers, glands, fasteners and handwheels
CoatingPreparation and protective coating as agreed for the service
Testing & recordsPressure test and documented handover requirements
ReinstatementControlled return, installation and practical checks
Connected supportAccess, fabrication, machining and rigging where separately included
Specialist rigging, removals in way, replacement valves or major components, Class attendance, third-party inspection and witnessing are confirmed separately when required.
Valve-service enquiries
Information that helps us assess the work.
What pressure are valves tested to?
Valves are normally tested between 3 and 5 bar, subject to the applicable classification-society requirements, valve duty and agreed scope. Testing can also be completed to the client’s specified pressure and acceptance criteria.
Can Naude Industries remove and reinstall valves onboard?
Yes, subject to isolation, access, permits and the agreed scope. Specialist rigging and significant removals in way are assessed and allowed for separately where required.
What is inspected during an overhaul?
The assessment may include the body, bonnet, seat, disc or gate, spindle, gland, follower, packing arrangement, gaskets, fasteners and operating mechanism, depending on the valve design.
Can Class or client witnessing be arranged?
Yes. Required hold points, attending parties, test criteria and records should be confirmed before work begins. Class attendance and third-party fees are treated according to the agreed scope.
What should be provided for a quotation?
Provide the valve type, size, rating, service, quantity, vessel or project location, photographs, available drawings, access information, required dates, test requirements and whether removal and reinstatement are included.