Archives :: Processing & Handling :: Liquid, Gas and Air Handling :: Valves

Displaying 181 - 200 of 211 stories.
March 28, 2011
Tideflex Technologies The CheckMate inline check valve (photo) is ideal for backflow prevention and odor mitigation. The valve’s unique elastomer fabric-reinforced design...
March 28, 2011
Spira-Trol control valves have extended options to ensure that the valves can be optimized for a specific customer application. Pneumatic-piston actuators have been...
March 28, 2011
Ultra-Seal Series 300 ball valves are two-piece, full-bore, flanged, seat-supported ball valves designed in accordance with ASME B16.34 and ISO 14313/API 6D standards. The series offers three seating options...
March 28, 2011
As part of its wide range of control valves, this firm offers a range of electro-pneumatic positioners that allow stroke tests to be performed without disrupting the process line. For example, the...
March 28, 2011
FireBag thermo-activated shut-off devices shut off gas supply when ambient temperatures reach 212°F, preventing the spread of fire that can lead to gas explosions. The FireBag will...
March 28, 2011
Conval The new double-length bellows valve completes this firms line of single- and double-bellows seal valves (photo). This new double-length bellows allows for the...
March 28, 2011
The upgraded Neles intelligent valve controller, ND9000, now incorporates a range of improvements that enhance its diagnostics and control performance, robustness and ease and efficiency of commissioning. The...
March 28, 2011
Introduced last August, the pilot operated safety valves (POSVs) include the pop-action Series 810 and modulated-action Series 820 valves. POSVs are typically used in petroleum refineries and gas...
March 28, 2011
Assured Automation The HP (high-performance) Butterfly Valves (photo) offer Class VI shut-off and an advanced seat design that provides a bi-directional...
February 1, 2011
The precise monitoring and control of valve position is essential for efficient automation of both discrete and continuous processes. Measurement of valve position provides the data required for the use of advanced control strategies and predictive maintenance algorithms. More effective monitoring of valve position has been an area in which considerable progress has been made in improving the performance...
October 1, 2010
Improvements to the performance of basic, regulatory control systems have a great return on investment and are some of the least expensive control improvements to make [1]. Control valves have a major impact on control loop performance and, therefore, improvements in valve performance can have significant economic benefits. This article shows how poor control-valve performance can be identified and...
February 1, 2010
For valves operating in hazardous environments, certification testing is critical to ensure the reliability and safety of the equipment. But this testing process has historically required facilities to shut down and sacrifice valuable production hours to check each valve. Built-in self-test (BIST) capabilities in smart, electronic valve actuators were developed in response to these testing challenges. This...
December 4, 2009
Fully serviceable inline, Clampseal blowdown valves provide control for continuous boiler or turbine blowdown, as well as bottom blow-off service. The valves...
December 1, 2009
Installed gain graphs can help improve the selection of control valves for chemical processing. The graphs are plotted to analyze together control-valve flow characteristics and process-system flow characteristics, and better illustrate the relationship between a control valve and the system. Predicting installed gain can help to increase controllability of the system and help avoid oversized valves...
September 1, 2009
New radial diaphragm valves improve 'cleanability' A single-body valve design with boreline seal that minimizes entrapment areas is responsible for the ease of cleaning. The DR Series of valves (photo) is designed for sterile flow streams in media preparation, fermentation, separation, petroleum refining, purification and other applications. The valves can be manufactured in a variety of configurations and...
June 9, 2009
Dresser Masoneilan (Houston, Tex.; was chosen by Saipem SpA (Milan, Italy) to supply control valves for the Qatar Fertilizer Co. (Qafco). Located south of Doha, Qatar, the Qafco industrial complex is quickly growing into the world’s largest ammonia and urea production site. The project involves one new Qafco urea plant, capable of producing 3,850 ton/d of granulated urea, in...
February 13, 2009
Vesta Tank Bottom Valves are used to shut off liquid media at vessels or tanks. Preferably installed at the lowest point of the tank bottom, their characteristic feature is shut-off at tank bottom level without any sump. The...
October 15, 2008
  The perfect valve to control your process has been selected. The valve will pass your maximum flow. Everything is great, right? In some cases digging a little deeper might help. The control valve usually should not be the...
October 15, 2008
The role of valves in a process is far from insignificant. These components enable engineers to control the vitals of a process: temperature, pressure, concentration, and flow. In some cases, the failure of a valve could be catastrophic and in other cases just a headache, but whatever your situation, your material selection will surely be one of the most important elements in determining the reliability of...
August 15, 2008
Gate Gate valves are designed to operate fully open or fully closed; When fully opened, there is very little pressure drop across the valve, and when fully closed there is good sealing against pressure. With the proper mating of a disk to the seat ring, very little or no leakage occurs across the disk when the gate valve is closed. Gate valves open or close slowly, which prevents fluid hammer and...
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