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Morgan produces largest ever severe-service ball valves

28 June 2015

Morgan Advanced Materials is now able to manufacture valve balls up to DN250 in diameter for severe-service valves from its Nilcra Zirconia-based material.

Previously, valve balls have only been available in sizes of up to DN150 but the trend in process industries to reduce cost by designing systems with larger pipe diameters which require fewer devices overall has led Morgan to create a capability to manufacture balls in this larger size.

A Zirconia-based material partially stabilised with magnesia, Nilcra delivers exceptional strength and toughness together with erosion and corrosion resistance and is therefore frequently used in place of conventional materials such as metal alloys to provide longer component lifetimes.

Meanwhile, tests carried out by Morgan Advanced Materials on its proprietary range of Lead zirconium titanate (PZT) materials for deep sea applications are proving they can withstand pressures greater than any they are likely to encounter in deep sea use with no loss of performance.

The tests involved a variety of ceramic formulations typically used in underwater applications, including both ‘soft’ and ‘hard’ PZT types. The objective was to better understand the behaviour of the materials and any changes in their electrical properties after tens or hundreds of exposures to very high pressures.

A pressure of 1,862 bar was applied to each ceramic type - equivalent to a depth of 18,500m underwater. This is beyond the maximum known deepest point in the ocean – the Mariana Trench, which at a depth of 10,994m (±40m) exerts a pressure of 1,086 bar, more than 1000 times the standard atmospheric pressure at sea level.


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