Historically control systems of choice for a facilities main steam pressure-reducing stations have been full pneumatic or “air” configurations, in part due to the practical benefits over other available systems. Air operated systems offered quicker response, high cycle life, and positive fail safe positioning. Pneumatic systems are often referred to as being “bullet proof” due to long-life expectancy and rugged durability in severe service conditions. However, following advancements in electronic control integration and increasingly competitive prices, digital controls packages have now become a viable substitute the pneumatic incumbent.
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