Well, because we in europe have many different engines and designs.
So, we often had not simply one steam turret, we often can find two or three, also some auxilary systems had their own steam supply directly at the boiler.
Most of the steam turrets I know are huge square sized multivalve cast iron parts. Behind the back lid, with a flange is the supply tube attached, is the valve bottom with the seat the top lid holds the packing and the valve spindle, with the valve pin, which can be screwed into the valve seat. At top a flange is mounted, were the steam comes in. It pushes the valve cone into the seat for sealing under pressure, the spindle opens the valve, lifts the pin from the seat and steam enters the opening, travels through the middle of the seat into the pipe attached to the back lid flange... traveling the pipe to the auxillary machinery.
We in Germany have air pumps, feed water pumps, we had steam valves for the oil burners on oil fired locomotives, valves for oil preheating tubes, valves for steam heating, valves for generator, valves for the extra blowpipe.
Stoker engines had valves for the coal mill in the tender and a valve for the stoker transport screw-conveyor...
There are many auxially machineries and usually have different types of construction.
Steam turbines propel the main generator in Germany at about 2500 rpm, and having the typical whining sound, like a modern jet turbine
Also the start up sound much like a jet turbine... the steam is not allways exhausted into the air, some exhaust into a direct feedwater heater, thus the exhaust steam is reused...
We in germany had also boiler feed pumps with steam turbines.
If pictures can help, please feel free to ask.
Allways keep two-thrid level in gauge and a well set fire, that's how the engineer likes a fireman