Now there are some power plant ball valve manufacturers are machining ball valve bodies from forged bar stock materials with massive wall thicknesses far exceeding that of rising stem valves. Some adopt the same ball valve body design on 1.5-inch and smaller sizes for all pressures classes—so that an ASME Class 1500 valve may actually have an ASME Class 4500 body. Usually Class150 300 600 800lb will have same body for SW/NPT connection valve, 900lb 1500lb will be one class.
The standardization of Valve body reduces raw material inventory, streamlines machining, shortens production times and allows for virtually unlimited alloy material selection.
Valve body material include: A105 LF2 304 316 304L 316L F51 F53 Monel Inconel Hastelloy alloy
Usage is restricted by the pressure and temperature rating stated on the original equipment manufacturer (OEM) tag and relevant American Society of Mechanical Engineers (ASME) and American National Standards Institute (ANSI) standards.
These valve are not only used as Power station, also for Oil/gas and Petrochemical industry.