Ball valve set to clean up
A
Flowserve product story
Edited by the Engineeringtalk editorial team
Aug 27, 2003
The Worcester Controls WK70 is a novel three-piece bidirectional flow ball valve.
The Worcester Controls WK70 is a novel three-piece bidirectional flow ball valve.
The a stainless steel tube bore valve will be manufactured at the Flowserve Flow Control plant in Burgess Hill to meet growing demand for clean valves.
Inside diameters of the WK70 components have tube bore dimensions so that the valve precisely matches the tubing it is connected to.
This prevents "puddles" forming and the build up of pyrogens or bacteria.
This feature, says Flowserve, makes the valve invaluable anywhere where microbes, media deposits, mineral impurities and cross-contamination can threaten the quality of the media.
It is ideally suited for use in the pharmaceutical, biotech, food, cosmetic, paint, chemical and semiconductor manufacturing industries and for handling ultra-pure gases.
Available in 15-50mm sizes, one of the main benefits of the WK70 is that it is built from forged parts, which provide a better grain structure and hence better surface features than those of cast valves.
They are stronger, free from crevices, pits, shrinks or inclusions and have better-controlled metallurgy.
Made from 316L stainless steel with a guaranteed ferrite content of less than 5%, the WK70 resists rouging that results from minerals and impurities being drawn from higher ferrite content metals.
The metallurgy of the WK70 body and extended tube ends also assures the integrity of the orbital welding.
The ends have a verifiable sulphur content between 0.005 and 0.016%.
Seats are PTFE, reinforced PTFE and Fluorofill, providing bubble-tight shutoff through the valve even under conditions of high vacuum and high cycle operation.
High cycle stem seals ensure external sealing when the valve is automated.
The Fluorofill seats are capable of working at up to 19bar working steam pressure, making the WK70 extremely well suited to sterile steam applications.
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