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

Displaying 181 - 200 of 204 stories.
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...
http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/valves/Pilot-operated-safety-valves-with-API-compliance_7709.html
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...
http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/valves/A-butterfly-valve-for-Class-VI-shut-off_7723.html
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...
http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/valves/Control-valve-position-sensors_6365.html
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...
http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/valves/Improving-Control-Valve-Performance_6046.html
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...
http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/valves/The-BIST-In-Electronic-Valve-Actuators_5459.html
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...
http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/valves/These-blowdown-valves-can-be-fully-serviced-inline_5349.html
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...
http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/valves/Creating-Installed-Gain-Graphs-for-Control-Valves_5317.html
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...
http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/valves/Focus-on-Valves_5030.html
June 9, 2009
Dresser Masoneilan (Houston, Tex.; www.dresser.com) 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...
http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/valves/Dresser-Masoneilan-to-supply-valves-for-Qatar-Fertilizer_4852.html
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...
http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/valves/Tank-bottom-valves-now-available-in-larger-widths_4527.html
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...
http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/valves/Feature-Report-Part-1-Using-Installed-Gain-to-Improve-Valve-Selection_4239.html
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...
http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/valves/Feature-Report-Part-2-Valves-and-Specialty-Metal-Materials_4240.html
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...
http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/valves/Facts-at-your-Fingertips-Valves_4087.html
August 15, 2008
Flowserve Corp. (Dallas, Tex.; www.flowserve.com) has introduced the Valtek Valdisk high-cycle seat, claimed to be a "breakthrough" seat design for Valtek butterfly valves. The new...
http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/valves/Chementator-A-New-Valve-Seat_4113.html
April 15, 2008
GEMÜ GmbH & Co. KG (Ingelfingen-Criesbach, Germany; edlinks.che.com/7371-551) has developed a new EPDM diaphragm for use at high temperatures and steam for the biotechnological and...
http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/valves/Chementator-A-new-valve-diaphragm_3822.html
March 15, 2008
Flowserve Corp. (Dallas, Tex.; edlinks.che.com/7370-569) has introduced a new noise-attenuating valve-trim for gaseous applications, one that simultaneously lowers the device’s manufacturing costs while improving its noise reduction capabilities. Like prior noise-attenuation trim, Flowserve’s Valtek Stealth is designed to reduce the velocity at the vena contracta (the point in a fluid stream...
http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/valves/Chementator-This-valve-trim-combines-multiple-noise-control-mechanisms_3741.html
February 15, 2008
The failure of a device or of a group of components can lead to overpressurization and subsequent adverse events, such as fire, explosion, spill or release. The most common causes of overpressurization are listed below. Understanding the circumstances surrounding overpressurization will help an engineer to avoid these failures. External Fire According to API RP 520 and 521 standards, a fire-exposed area is...
http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/valves/Causes-of-Overpressurization_3671.html
December 15, 2007
Demanding application requirements coupled with improved downstream control devices and enhanced instrument diagnostics have led to major changes in process-valve monitoring and control. Factors driving these changes in the chemical process industries (CPI) include the need for lower plant operating costs, reduced maintenance requirements, greater efficiency and reliability in onstream performance, and...
http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/valves/Feature-Report-Advances-in-Valve-Position-Monitoring_3560.html
November 6, 2007
Honeywell Process Solutions (www.honeywell.com/ps) has announced a $9.1-million agreement to provide control valves for the new integrated Pearl Gas-to-Liquids (GTL) plant in Qatar, a partnership between Qatar Shell GTL Ltd. (Shell) and Qatar...
http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/valves/Honeywell-announces-$9-1-million-control-valve-contract-for-Qatar-GTL-plant_3462.html
October 31, 2007
This week, Plast-O-Matic Valves, Inc. (Chem Show, New York; Booth 1018) debuts an all-thermoplastic, air-operated pinch valve with a newly designed sleeve element. With an open tubular-sleeve element to control flow, the Series HSA pinch valves provide an open flow path to eliminate dead spots...
http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/valves/Pinch-valve-introduced-to-accommodate-particulate-flows_3436.html
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