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Achieving Predictable Valve Performance for Safety Applications

A focus on having the proper specification, design and integration of final elements is key in the actuation of valves for the process industry. As users collect more data through testing methods, they are discovering that final element assemblies are not always performing reliably throughout their mission time. For example, two observed failures are torque/force that is insufficient to move the valve to the safe state and mechanical failure of final element components from stress beyond the element’s ultimate strength. These two failure modes are evidence of a lack of robustness in the current process used to specify and design integrated final element assemblies.

Valves with All the Trimmings

The term valve trim has been around for about 150 years—shortened at one point from the word: “trimmings,” a term in vogue until the late 1930s.

Check Valves in LNG Cryogenic Service

Because natural gas is currently considered a good source of energy for both environmental and economic reasons, it’s growing in use. This trend promises to continue worldwide for many years to come.

Unique Operating Dynamics of Trunnion-Mounted Ball Valves

For a very long time, the idea has existed that a trunnion-mounted ball valve can be opened under full differential pressure if the piping system can withstand the rapid increase in pressure and the forces induced by it. As valve sizes and operating pressures increase, however, several factors need to be considered if that valve is opening with little or no pressure downstream.

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