Vector and Wellheads engineering turbine bypass system

This paper has a good flow diagram with valve locations.  The turbine bypass system is a very important component in power stations, and of a difficult service too. Although, it does not operate continuously, when it is required to operate it must be fast and reliable. Its main job is called steam conditioning. This means pressure reduction and desuperheating of steam that has been produced by the boiler but, due to transient or unexpected conditions, cannot flow through the turbine. The percentage of total steam handled by the turbine bypass system depends on plant design philosophy. Capacity usually ranges between 30% up to 100% of the maximum continuous rating (MCR) boiler steam flow. V&W turbine bypass systems are custom designed, suitable for the specific needs of the individual plant.

https://flowandcontrol.com/wp-content/uploads/2010/09/VW-Turbine-Bypass-Valves.pdf