02-14-2022, 06:45 AM
Molecular sieves use a desiccant process to remove water vapor from hydrocarbon streams. The process involves flowing hydrocarbon fluid over an adsorption bed to remove moisture. As a bed reaches saturation, switching valves direct the hydrocarbon gas to another bed while the first bed is regenerated with hot, reverse flowing gas.
Historically, the industry has used rising Segment Ball Valve for molecular sieve service. This design employs a mechanical arrangement that first moves the ball off the seat, then turns the ball away from the seat as it opens. The valve closes by first twisting toward the seat, then jamming against it to achieve tight bidirectional shutoff. The RSBV design has two design issues. The mechanical stress on the stem is excessive, eventually warping the stem and creating seat leaks. More detrimental are the higher fugitive emissions associated with a rising stem design, which tend to be 100 times higher than with a rotary valve.
Double eccentric C-Ball Valves are available in sizes from ½ inch to 42 inches, and pressure classes up to 4,500 pounds. End users are utilizing this technology for molecular sieve switching applications, and they are also deploying the valves in a variety of other severe service applications that demand reliable shutoff and long life.
Actuators are an integral part of instrumentation systems that power the machines that exist today. These devices make it possible for the machines to interact with their surroundings the way they do. In this article, we take a closer look at omnipresent technology.
Historically, the industry has used rising Segment Ball Valve for molecular sieve service. This design employs a mechanical arrangement that first moves the ball off the seat, then turns the ball away from the seat as it opens. The valve closes by first twisting toward the seat, then jamming against it to achieve tight bidirectional shutoff. The RSBV design has two design issues. The mechanical stress on the stem is excessive, eventually warping the stem and creating seat leaks. More detrimental are the higher fugitive emissions associated with a rising stem design, which tend to be 100 times higher than with a rotary valve.
Double eccentric C-Ball Valves are available in sizes from ½ inch to 42 inches, and pressure classes up to 4,500 pounds. End users are utilizing this technology for molecular sieve switching applications, and they are also deploying the valves in a variety of other severe service applications that demand reliable shutoff and long life.
Actuators are an integral part of instrumentation systems that power the machines that exist today. These devices make it possible for the machines to interact with their surroundings the way they do. In this article, we take a closer look at omnipresent technology.