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Construction features for the ball valves in power plants

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. The standardization reduces raw material inventory, streamlines machining, shortens production times and allows for virtually unlimited alloy material selection. 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.

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