Introduction
Industrial steam turbines are found in many industries and
utilized in a variety of applications. There are two basic types of
turbines: condensing and back-pressure. Condensing turbines
operate with exhaust pressures less than atmospheric pressure,
while back-pressure turbines operate with exhaust pressures equal
to or greater than atmospheric. Back-pressure turbines are smaller
in physical size than an equivalent condensing unit, and usually
operate at higher rotational speeds due to efficiency considerations.
Regardless of the steam-turbine type or application being considered,
speed and/or load control will be required. This control is
provided by the inlet steam valve