- 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.
- Published on Wednesday, 21 January 2009 01:00
- Written by Bruce Gorelick
Steam traps are the most important link between the steam and condensate system. Malfunctioning steam traps can waste tremendous amounts of money. Here is an example: A single inverted bucket steam trap (with a one-eighth-inch orifice) blowing-thru in a 150 psi, where the steam cost is $11.00 per 1,000 lbs. of steam produced, will waste 62.49 lbs. of steam per hour and cost approximately $6,022 in fuel losses per year.
- Published on Sunday, 19 October 2008 20:17
- Written by David W. Spitzer
A differential pressure flow measurement system consists of a differential pressure primary flow element and a differential pressure flow transmitter.
When the flow of a fluid in a pipe passes a restriction in the piping system, the pressure in the piping system is reduced. Most differential pressure primary flow elements are designed, constructed and operated in a manner such that the flow rate is proportional to the square root of the pressure drop across the restriction. These differential pressure primary flow elements include orifice plates, Venturi tubes, elbows, flow nozzles, low loss flow tubes, single-port and multiple-port Pitot tubes, segmental wedge and V-Cone flowmeters.