What is the CV valve of steam turbine?

It is a kind of regulating valve, which is generally called CV-control valve regulating valve.

Steam turbine is a kind of rotating power machine that converts steam energy into mechanical work. Also known as a steam turbine. Mainly used as the prime mover of power generation, it can also directly drive various pumps, fans, compressors and ship propellers. You can also use the exhaust steam or intermediate extraction steam of the steam turbine to meet the heating needs in production and life.