Mick Beavers, Valve Business Manager for BKW Instruments Ltd reports

Over the years we have been asked to check the sizing of customers control valves. In most cases the process conditions have altered from when the valve was first installed, which then leads to re-trimming of the control valve. Though this will greatly benefit the customer to have the correct sized trim, not only in controllability but also has huge cost saving benefits. With traditional methods of re-trimming being expensive and sometimes taking weeks to receive the parts from the manufacturing company, BKW have launched the control valve performance monitoring and diagnostic flow rig.

BKW’s flow facility offers UKAS traceable calibrations for all makes and types of mass and volumetric flow meters. Through constant investment in our valves division we have adapted the flow rig to suit control valves. By looking at the customer’s service conditions we are able to monitor the valve’s performance and diagnose any problems that the specific flow, pressure or temperature may cause. Using Fisher’s DVC2000 we are able to custom characterize the valve using a twenty-one point calibration, this means that the valve may not require a new trim. Customers are encouraged to come to our facility and witness these tests to gain a thorough understanding on what is achieved.

This facility was a huge success for one of our customers, a world leader in the pharmaceutical industry. By removing a well known make of an electro-pneumatic positioner and replacing it with a Fisher DVC2000, the customer’s process has been improved and has resulted in a more efficient process and less down time due to process set-point alarms being raised. In addition to monitoring the performance of the control, we are also able to monitor packing failures. Selecting the correct packing system for the application is a crucial part to sizing and selecting the correct valve, a fact engineers sometimes overlook. Once the correct packing system has been installed we can set the valve up using the flow rig so that friction and stiction are eliminated from the performance of the valve, giving better controllability on site.

Training courses can be arranged at our facility and tailored to the customer’s needs using our purpose built flow rig.

BKW, Tel: 0161 707 4838

Published in Valve User Magazine Issue 6

Summer 2020 // Issue 53
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