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Technical

Design Considerations for High-Temperature Sealing

With growing pressure to combat fugitive emissions and meet strict industry regulations, understanding the latest sealing technologies and design considerations for component solutions in severe applications is becoming increasingly critical. As operating conditions continue to subject valves to ever more extreme temperatures and pressures, sealing them effectively poses a challenge that cannot be met with traditional elastomer and polymer-based gaskets. In these extreme environments, metal seals have much greater design flexibility to address critical issues regarding temperature, pressure, fire safety, leak rate and process compatibility. As a result, metal seals often are the sealing solution of choice in modern valve applications, but numerous design considerations must be taken into account to ensure the seal will perform as expected in these increasingly harsh environments.


The Many Layers of Valve Qualification

While there has been much rhetoric from the new U.S. administration over the past two months about “deregulation,” Cameron’s This email address is being protected from spambots. You need JavaScript enabled to view it. pointed out in his presentation at VMA’s 2017 Technical Seminar there is much more to achieving approved status for valves than meeting governmental regulations.

Daglio joked that there are many terms in use now to attempt to convey just how important valves are. Whether they’re called “supercritical” or “ultracritical” or just “critical,” the bottom line is that valves are essential to the operation of many systems. They must also function in increasingly high pressures and temperatures, as well as in unconventional and extreme environmental conditions, while being robust enough to stand up to highly corrosive chemicals and meet end-user requirements for near-zero leakage, especially valves in gas service.

Valves Help Achieve Net-Zero Water Use

With drought and climate change affecting countries around the world, there is a tremendous need for development of sustainable architecture. One shining example of what can be done with proper planning and intelligent use of existing technology—including smart controls and valves—is the Center for Sustainable Landscapes (CSL) at Phipps Conservatory and Botanical Gardens in Pittsburgh, PA.

The 15-acre campus of Phipps Conservatory and Botanical Gardens includes a LEED-certified Welcome Center and Production Greenhouse, a conservatory and the Center for Sustainable Landscapes, one of the greenest buildings on earth.

How to Improve Control Valve Performance with Positioners

As the final control element in most process control and automation systems, control valves are part of a complex system-within-a-system in which the valve positioner can be an integral component.

The control valve is made up of four principal sub-systems:

  • The valve body, which includes the bonnet and piping inlet and outlet connections.
  • The valve trim, plug, stem, cages, retainers and disc, used to control the flow through the valve body.
  • The actuator, used to provide power to move the valve stem or shaft.
  • The positioner, used to control the position of the valve stem and provide linearization.

VMA Technical Event: Engineering Valves in the Extreme

While much the 2017 VMA Technical Seminar, held March 2-3 in Nashville, focused on numbers, statistics and specifications, attendees were reminded in a highly charged, emotional presentation by safety awareness speaker Brad Livingston just why it is important to be so vigilant when engineering valves in the extreme.

In “Just a Second Ago” Livingston recounted the events of 1991 when he nearly lost his life because of decisions he and a co-worker made to shave a few moments off a welding job on a natural gas pipeline. According to Livingston, the two explosions—which were 100% preventable—happened because standard safety procedures were ignored. He blamed himself for not speaking up and insisting they be followed, and his plea to those gathering for this event was: “Consider, what is it worth?”

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