IMTEX develops innovative PST solution   IMTEX Controls has developed an innovative solution for partial stroke testing of valves, says Engineering Manager Paul Turner....
	A descriptive definition of valve actuators Chris Warnett reviews the types of actuators used in the flow control industry. He also shows how the advent of micro-circuitry has resulted in actuators becoming more sophisticated, checking on the health and well being of a valve as well as providing predictive maintenance data....
	Actuation: a growing market Industry veteran Mr Earnie Carey (Marketing and Product Manager at Flowserve Limitorque) spoke to Valve World's Gillian Gersley about his thoughts on the actuation industry and expectations for future trends....
	Actuator suppliers turn out for the StocExpo Held in March 2011, the StocExpo is a major event for the tank terminal industry and regularly draws actuator suppliers. Valve World went in search of these exhibitors to ask them about their thoughts in the industry....
	Advanced technology in pneumatic part-turn actuators Writing for Valve World, Günter Öxler brings his personal views on technical developments and achievements in the flow control industry. In this article he discusses advanced technology in pneumatic part-turn actuators for process valve actuation. NOTE: Mr Oxler can now be reached on: guenteroexler@aol.com...
	Advantages of low-pressure Jet Engine Actuators In the past decade a new type of actuator has been developed, using the principle of the reactive gas turbine – a jet engine - as the driving force. This article discusses the advantages of the jet engine actuator (supplied by low pressure compressed air at 0.4MPa) compared to the piston pneumatic-hydraulic actuator....
	Advantages of variable speed actuators This overview article by SIPOS Aktorik's Mrs Noelp and Mr Rebhan outlines the structure and methods for generation of speed variation, explains the benefits using applications in the valve field and indicates design / detail project planning advantages arising from the use of VSDs....
	Control valve actuators: their impact on control and variability Chris Warnett discusses important issues during actuator selection for control valves such as resolution, repeatability and precision, and explains how a new electric actuator can significantly improve on traditional performance. ...
	Digital communication goes underground Organizations around the globe have been using advanced computer systems above ground for years to improve operations. Now these systems are moving underground, with mining sites installing systems that are enabling different parts of the operation to better integrate and work more efficiently. By Nick Smith, Tyco Flow Control....
	Electric actuators for control valves In this technical paper, Rotork discusses its new electric actuator for the operation of process control valves. The CVA range provides continuous, repeatable modulating control with a programmable fail to position option. It can operate on an industry-standard 4-20mA control signal or digital bus...
	Electric valve actuators in the modern power industry In recent years electric valve actuators have grown in importance in modern power plants, contributing to efficiency, economy and safety as well as facilitating the quick start-ups demanded by today’s working practices and the emission reductions dictated by environmental legislation. Electric actuators may be required for an extensive range of duties encompassing isolation, regulation, modulation and failsafe operation of valves and dampers. This article looks at the selection and specification...
	Electro-hydraulic actuators with operating comfort Electric actuators are compact, simple to use and offer numerous monitoring features. However electric actuators do not have quick operating option or stored energy. In this article, Henoch Hoster offers a solution: a Schuck electronic control system plus the SST electro-hydraulic actuator....
	Growth in China - and the actuator potential With an average economic development rate over the past 35 years of around 10%, China offers considerable potential for the continued adoption of actuators to support its expanding infrastructure. The status of China on the industrial stage is reinforced by the country becoming the world’s largest developing region. By Wei Zhuofu, Head of SIPOS Aktorik, China...
	Recent developments in process valve diagnostics Most process valve manufacturers market 'smart' or 'intelligent' valves – typically a digital positioner plus a control valve. While this technology has been available for a long time for control valves, the situation in automated on/off valve development is totally different, argue Metso Automation Managers....
	Retrofitting a refinery A previous Valve World report on AUMA’s success winning a contract to supply the BP Refinery in Rotterdam outlined the challenging requirements for electric actuation set by one of the world’s biggest energy companies. Following the installation of over 1,000 explosion-proof actuators, the manufacturer of modular actuation technology provides this follow-up article, with particular focus on how the site’s retrofit requirements were achieved....
	Scotch Yoke or Rack-and-Pinion pneumatic part-turn actuator? Further to previous discussions regarding pneumatic part-turn actuators, Gunter Oxler takes the opportunity to report on the best choice between the different technical solutions offered by pneumatic part-turn actuators. NOTE: Mr Oxler can now be reached on guenteroexler@aol.com...
	Shipping and storing butterfly valves with actuators By popular demand, Günter Öxler returns to the topic of storage and shipping of valves. He discussed simple and cost-effective solutions to eliminate trouble and work on the job-site during installation, commissioning and start-up procedures. NOTE: Mr Oxler can now be reached on guenteroexler@aol.com...
	Subsea valve actuation - reliability in depth With an installed base dating from the early 1990s, operating at depths down to 2500 metres, Rotork Fluid Systems is familiar with supplying hydraulic actuator products to meet stringent subsea demands. Rotork’s qualified engineering group has established a range of actuators with ROV (Remote Operated Vehicle) or diver operated facilities and developed some innovative solutions for specific subsea valve operations. A brief summary of valve applications using Rotork’s actuators includes ESD (emer...
	Up close: developments in valve actuation David Sear recently interviewed five staff at Rotork, who agreed to have their comments captured directly on film!...

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