Control Valve Performance Issues     Control valves can have a major impact on control loop performance, which means improvements in valve performance can lead to significant operating benefits, say James Beall and Clinton Anderson from Emerson Process Management. In this article they show how poor control valve performance can be identified and corrected. A plant exampìe is used to demonstrate these methods. ...
	Control valve applications from all over the world In 2008, Valve World took a look at the latest news from the control valves sector. The article shows a variety of control valve applications from around the world and also presents a novel control valve design....
	Applying control valves on compressor anti-surge systems In this technical paper, Ed Singleton outlines various points that should be considered before a control valve can be specified for compressor bypass service. The paper has generally been written at a basic level for those who are not too familiar with control valve technology....
	Axial excellence in China's gas transmission network China is a fast developing market, requiring the latest technology with very demanding standards for operations and reliability. In this technical article, Mokveld presents some benefits in using axial control valves and provides application examples of their engineered valve solutions in China....
	Control valve testing and qualification for PSA service John Bessman (Emerson Process Management) gives a technical overview of a PSA system, the typical valve requirements and customers’ experiences with OEM valves. He then discusses the Fisher PSA test programs and results, showing how total cost of ownership can be reduced....
	Control valves all over the world Valve World gives you an update on the latest developments of the global control valves industry. Supplier infrastructure investments, technical developments, joint ventures, project orders and a case history are all presented....
	Control valves for pump protection service This paper discusses the essential procedures involved in the application of control valves for the protection of pumps operating at low flow conditions. Automatic Recirculating Valves (ARC Valves), although they do not fall into the category of control valves, do play an important role in pump protection, so a reference to these is also included....
	Improving control valve performance This technical article by Patrick Yost is about the packing service life of level control valves at Quad Cities Power Station, USA and how Kalrez Valve Stem Packing (KSVP) can help to prevent or stop valve leakage. The article also describes the station’s experiences with KVSP and reasons for expanding its usage....
	Knowledge of valve condition brought up-to-date through audit In the spring of 2007 Metso Automation carried out an extensive audit of the installed equipment base and equipment inventory at Rautaruukki’s Raahe Works. More than a thousand Neles control and on-off valves were audited. Laura Ruippo reports on how the audit was carried out....
	Re-designing trims for boiler feed pump control valves At the Ghazlan Steam Power Plant in Saudi Arabia, all twelve boiler feed pump recirculation control valves developed excessive seat leakage within a year of operation. This paper by Mohammed Al-Ismail presents an account of valve failure and analysis and how the trims were successfully replaced....
	Space-saver PRDS: pressure reducing and desuperheating valve in one In most heating and process applications, saturated steam is a prerequisite. The main challenges for these applications are lowering costs yet boosting efficiency. This article by RTK Control Systems Ltd's Sam Samad shows how one valve can make this possible....
	Streamlining control valve selection using EDE Despite the use of electronic documents, simulation software and the like, the design, procurement, and purchasing of capital equipment is still a very labor-intensive process. The next major step forward will come with the implementation of electronic data exchange, says Ray Hardee. ...

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