Last updateTue, 24 Nov 2015 6pm



Enhancing Valve Component Performance Through Design by Nanolamination

NanolaminationToday, the total cost of corrosion in the U.S. exceeds $1 trillion annually—and from oil & gas operations to municipal infrastructure, metal-based components like valves are in some of the most corrosive environments imaginable. Some techniques to prevent corrosion are cost-effective but may not be long lasting. Others are quite effective but can be costly. Manufacturers continue to seek new ways to prevent corrosion. Here is a new process that is showing great promise.

Low-Temperature Sealing with Elastomers in Sour Gas

Low Temperature Sealing with Elastomers in Sour GasLow-temperature sealing with elastomers is critical in both arctic regions and subsea valves. Additionally, sour gas or hydrogen sulfide is increasingly being found in oil and gas production as more challenging fields are being developed throughout the world. Valves are being asked to perform in sour conditions that involve expanded temperature ranges along with pressure cycles. The performance of the seals in a valve is often the limiting factor in a valve’s performance; knowing the effects of low-temperature and sour gas on elastomers is critical in oil and gas valve applications. While many engineers are comfortable specifying metals for valves in sour environments, they may not have an understanding of the performance limitations of the elastomers. The limitations for elastomers that will determine a successful seal in a valve often include properties such as oil resistance along with high- and low-temperature performance. Following is a review of these limitations from the perspective of low-temperature performance and sour gas resistance. Additionally, strategies will be provided to ensure the best seals are selected for a given application.

European vs. U.S. Temperature Code Ratings for Solenoid Valves

Europe vs US tempSolenoid valves are vital components of many process automation systems. Users must depend on these valves to operate flawlessly in hazardous or explosive environments to comply with safety regulations and to stay up and running for continuous, safe operation of the process and the plant.

Understanding the differences between valves is critical in specifying and selecting the correct models. That’s a useful skill for end­user application and process engineers, as well as for design engineers employed by original equipment manufacturers (OEMs).

However, such understanding can be hard to come by. Particularly difficult for many buyers is understanding differences in valves’ temperature ratings. These T­code ratings are assigned by approval agencies in the U.S., Europe and other regions worldwide as industrial globalization increases.

Electric Vs. Fluid Power Choice for Valve Actuators

Electric vs. Fluid Power Choice for Valve ActuatorsSince the early days of valve actuator use, there has been a choice between powering the actuator with electricity or pressurized fluid. Sometimes a user industry has a traditional preference for actuator power and sometimes it’s dictated by the circumstances of the application.

Deciding the best power medium for an industrial application depends on many factors such as following what has traditionally been used in the application. But with today’s sharp focus on return on investment and environmental impact, the traditional solutions now warrant closer examination.

For plants that have instrument air systems, the choice of actuator power is more flexible because electricity is usually available to power the instrument air supply. Either fluid or electric-powered actuators could be used. But there are many installations, such as well heads, pipelines or irrigation systems where an electric power supply is not available.

Where both power modes are available, then the choice comes down to other criteria and the traditional choice varies by industry and region.

From Cannon Balls to Pressure Seals: Graphite for Sealing

valve assy 1Graphite has qualities that make it a great choice for certain applications in the manufacturing world. Those qualities include its reaction to extreme temperatures, as well as its flexibility when engineered a certain way.

In the valve world, flexible graphite provides an ideal choice for many sealing products.

The History of Graphite

The stories about graphite go back to about 1500 when an enormous deposit of graphite was discovered in the Borrowdale Parish in England. One of its first uses was as a refractory material to line molds for cannon balls, which resulted in rounder, smoother ammunition that could be fired further. This better way of making the balls contributed to the growing superiority of the English Navy back then.



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