ARCA – Around the Steam Turbine

At the heart of a power station are the steam turbines and Arca has the excperience. They serve as a generator or mechanical drive for pumps and compressors. For its operation a network of valves is built around the turbine. Steam inlet valves direct the steam flow into the turbine while extraction valves withdraw the steam from the different intermediate stages. Gland steam and leakage steam control valves provide the labyrinth seals in the hub areas with steam, that seal the turbine shaft towards the turbine housing. Drain valves drain accruing condensate from the steam pipeline to the condensate collector.

For the project Pingshan ARCA delivered the steam supply control valves, the seal steam control valves and the drain valves of the steam turbine. The supply control valve in DN 400 controls the steam flow from the reheater into the turbine. Equipped with a hydraulic actuator suitable for a hydraulic pressure of up to 140 bar, it has an actuating time during control operation of 20 seconds and for quick close and open it has a time of 2 seconds and 5 seconds respectively.

The actuator in the picture can provide a maximum actuating force of 44 kN. Silencer disks at the valve outlet ensure a low-noise operation. Turbine manufacturers world-wide count on the know-how and experience of ARCA for the design and delivery of these valves. Together with our customers we develop solutions for efficient turbines with valves suitable for temperatures up to 650°C and nominal pressure up to PN720/Class 4500. To find ut more visit

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