Weld Overlay On Valve Sealing Areas

The main reason for utilizing weld overaly on valves is to allow a less expensive base material to have the corrosion properties of a much more expensive material at the surface. CRA Overlay on ball valve Dynamic Seals, Static and Dynamic Seals, and CRA Overlay All On Wetted Surfaces are usually applied.

A weld overlay is a type of cladding that uses a welding process to melt a material onto the surface of another, different material. A weld overlay is performed to protect the base material from wear or corrosive environments.

The benefits are that the wetted surfaces have the corrosion resistance of the clad material with an overall cost closer to that of the base material, ensuring better performance than solid exotic materials due to the better resistance to deformation of the base material (carbon steel).

CRA Overlay All On Valve Wetted Surfaces

Weld cladding is today a very efficient and cost-effective solution for the surface treatment of valves used in highly corrosive and erosive metal-loss environments.

Relia provides fully project-managed customer solutions for the oil and gas industry's corrosion-resistant overlay applications, such as Inconel 625 and SS316, utilizing the latest industry techniques and equipment. The base materials utilized in the production process are normally carbon steel or low alloy steel.

Valves are available partially or fully cladded, as shown below; special cladding configurations or materials are available on request.

CRA Overlay on Valve Dynamic Seals

Cladding only on the seal surfaces prevents leakage past parts that are in relative motion. Typically, for trunnion ball valve, dynamic seals are the stem and seat gasket.

CRA Overlay on Ball Valve Dynamic Seals

CRA Overlay on Valve Static and Dynamic Seals

Cladding on all seal surfaces prevents any type of leakage of the valve, static or dynamic. The connection to the line is not cladded as standard (it is considered part of the line); any pipe connection can also be cladded upon request.

CRA Overlay on Ball Valve Static and Dynamic Seals