Feedwater Control Valves Upgrade - Power Station

We were approached by a Power Station to help solve an ongoing repeat failure of a number of Feedwater Control Valves (HP, MP & IP)

After technical evaluation of the operating conditions and the current OEM valve we identified and presented a number of improvements to the customer. It was clear that the OEM technology for this application was not up to the job so CPC engineered a trim solution that would fit directly into the existing OEM valve with no alterations to the body or actuator assembly.

The design included a number of improvements including relocating the balance seal off the plug and into the cage plus the addition of labyrinth grooves on the plug to help reduce the velocity at the seat area.

Solving the problem:

• Piston rings failing on the plug
• Cavitation on the seat face
• CPC Design putting a Balance seal in the cage replacing the piston rings plus adding labyrinth grooves on the plug to reduce cavitation.