The Bellino HP Turbine Bypass Valve is utilized in power generation facilities to bypass the high-pressure turbine. It directs high-pressure, high-temperature steam from the main steam line to the cold reheat line, simultaneously performing pressure reduction and temperature control.
The valve operates under startup, load rejection, turbine trip, or bypass conditions. The system must control:
The application requires a specialized pressure-reducing trim, typically multi-stage, to limit velocity, noise, and erosion. Outlet temperature is controlled via desuperheating, either integrated or downstream, depending on the plant layout.
Critical selection criteria include:
In HP bypass service, an actuator with sufficient thrust and response time is used for rapid opening in transient conditions. Control is typically managed with a pressure controller for the steam valve and a temperature controller for the spray water valve. Protection logic must be coordinated with boiler, turbine trip, and reheater protection.
The product page lists certifications such as RINA ISO 9001:2015, Achilles Certificate of Registration, Lloyd’s Register Certificate of Conformity, and Lloyd’s Register EU Technical File Receipt.
When is the HP bypass valve used?
During startup, shutdown, turbine trip, or when the boiler must operate without full flow through the HP turbine.
What data is required for sizing?
Steam flow, P1/P2, T1/T2, cold reheat conditions, spray water data, allowable noise, leakage class, stroke time, and fail-safe requirement.
The HP turbine bypass valve routes high pressure, high temperature steam around the HP Turbine, from the main steam line typically to the cold reheat line. In doing so, the HP turbine bypass valve must perform both pressure reduction as well as temperature control.
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