Valve Maintenance

Industrial Valve Maintenance and Overhaul: Absolute Sealing in Your Process Lines

Heavy-duty valves, which are the most critical elements of fluid control in petrochemical, power, and chemical plants, lose their sealing properties over time due to high pressure, corrosion, and erosive chemicals. At DRS Makina, comprehensive mechanical maintenance, overhaul, and modification procedures of large-diameter industrial valves (Gate, Globe, Butterfly, and Check valves) that risk your process safety and cause energy losses are executed in accordance with international standards.

Comprehensive Overhaul of Heavy Industry Valves Heavy-tonnage valves that have suffered corrosion and lost their functionality due to operating under severe process conditions in your facility are transferred to our workshops, where they are primarily entirely dismantled and subjected to sandblasting processes. Wear within the internal structure of the valve body, fluid passage routes, and bonnet sections is examined by our expert teams, enabling millimetric damage assessment.

Renewal of Sealing Surfaces (Weld Overlay and Hardfacing) Flange surfaces and internal body wall wear, which are the most critical points ensuring the sealing of large-diameter valves, cannot be merely bypassed through grinding. In DRS Makina workshops, these surfaces are rebuilt to their original thickness through special weld overlay (hardfacing) methods applied by our expert welding engineers. These filled surfaces are subsequently machined on precision machine tools (turning/milling) and subjected to lapping processes, thereby restoring them to their original factory tolerances and mirror finish.

Testing, Calibration, and Commissioning Valves, whose mechanical body maintenance, stem straightening, and gasket/packing replacements have been completed, are delivered to our quality control department following the assembly phase. All valves are subjected to hydrostatic and pneumatic leak tests above their operating pressures in accordance with API 598 and EN 12266 standards. Valves receiving “zero leakage” approval at the required pressure values are delivered ready to be integrated into the system on-site after the completion of anti-corrosion industrial painting processes.