- Published on Monday, 30 September 2013 09:06
- Written by David W. Spitzer
There are many types of flow devices used to measure liquids and gases in closed pipes and open channels. Knowing which flowmeter is appropriate for which application requires knowing the difference between the many choices. This column seeks to give readers a basic understanding of the different types of flowmeters and what to consider when selecting them.
- Published on Thursday, 20 June 2013 09:41
- Written by Leo Minervini
Plant operators across the world are tasked with maximizing efficiency and output from existing facilities, which can be a major challenge when there are many valves and actuators. Plant management strategy to accomplish this task includes developing a better understanding of how valve and control assets perform in the field and to adopt preventative maintenance to minimize plant downtime. Valve positioner technology today has evolved to help plant managers with this major challenge.
- Published on Friday, 29 March 2013 06:00
- Written by by Marty Mincevich and Steve Sick
When it comes to getting automation parts shipped, everyone in our industry wants to receive those parts as quickly as possible—it’s a natural inclination. But often, speed is more than nice—it’s critical.
- Published on Monday, 03 December 2012 09:27
- Written by Greg Johnson
To be of value, valves must be attached to a piping system. How that attachment occurs has changed over time. For decades, screwed or flanged connections were the only way to go. However, the perfection of fusion welding techniques in the 1930s led the way for new methods of joining piping components, including valves. These new ways are the butt-weld (BWE) (Figure 1) and socket-weld (SW) (Figure 2) end connections.
- Published on Tuesday, 04 September 2012 14:25
- Written by Gary Burrows and Amr Atiah
Soft goods such as rings, gaskets, bushings, washers, seals and packing sets are widely used in valves and actuators. Manufacturers specify fillings and percentages for compounds for these soft goods to ensure they will operate properly with their valve and actuator products.
- Published on Monday, 25 June 2012 08:49
- Written by George P. Davet
Belleville springs are used within or adjacent to valves for a variety of purposes—the most common being to maintain load on a seal, gasket or packing. They often are used as machine elements in valve actuators or as a component of the valve mechanism and are designed or arranged to provide useful mechanical properties within small spaces. This means they can be retrofitted into existing valve designs with minimal revisions. Clearly, these mechanisms serve a vital purpose. However, many important factors should be considered in selecting a spring.
- Published on Monday, 19 March 2012 09:32
- Written by Tim Gainer
Instrument, mechanical or project engineers may see a multitude of temperature applications cross their desks. Their immediate reaction might be to employ a temperature control loop. But could a mechanical, self-operated temperature regulator be a better solution for the valve application?
- Published on Wednesday, 05 October 2011 14:32
- Written by Peter Cleaveland
The days when companies populated their websites primarily with PDFs of catalogs, a few paragraphs “About the Company,” a list of “Contacts,” and highlights of “Products” and “Customers Served” are behind us. Saavy companies today know that to draw customers and potential customers to their sites requires coming up with ways to add value to those who visit. After all, the world is now bombarded with places to go on the Web so companies need to find reasons why people should visit their website.
- Published on Wednesday, 21 April 2010 01:00
- Written by David Fink
Specification sheets for selecting automated valves list requirements for the valve and actuator but often lump all other devices together as related instrumentation or accessories.
- Published on Wednesday, 14 October 2009 15:12
- Written by Peter Cleaveland
Like anything made of metal, valves are subject to corrosion and other natural forces that compromise their performance. However, the right coating can protect those valves not just against corrosion, but erosion and wear.
- Published on Wednesday, 22 April 2009 22:06
- Written by Tony George
In any control system, the option potentially exists to select either a control valve or a regulator, so it is useful to compare the respective performance and economics of these approaches to arrive at some general selection guidelines.