Performance Enhancements For Mass Flow Controllers
Most gas flow meters are equipped with seals made of DuPont™ Viton® fluoroelastomer. However MFC’s need O-ring seals and other custom parts that do not swell in the presence of more aggressive chemicals utilised within their wide range of industrial applications. The sealing specialist Dichtomatik Ltd, is an authorised distributor for the DuPont™ Kalrez® range of sealing products, designed to give extended performance when operating with the widest range of chemicals, even incorporating elevated temperature conditions. Tests undertaken with an MFC, fitted with DuPont™ Kalrez® Spectrum™ 6375 O-rings and custom parts, increased reliability of operation and the overall Meantime Between Failures (MTBF) of the equipment.
This increased reliability ensured a competitive advantage for the MFC manufacturer and a commercial advantage for the equipment user, as it reduced production downtimes. A logistics saving was also achieved as the standardisation on Kalrez® parts for all the site modules led to a reduction in the worldwide inventory of different elastomer seals types for the company. A typical selection of specialised Kalrez® Spectrum™ seals and their particular qualities are detailed, offering minimal swell in various liquids, together with extended lifetime and performance characteristics:
Ref 6375 - for broadest chemical resistance
Ref 7075 - for highest service temperature (up to 327°C) and lowest compression set
Ref 7090 - for high hardness/ higher module properties
Ref 3018 - general use in the chemical process and oil exploration industries
Ref 8085 - excellent mechanical strength, very low particle generation and longer seal life
Ref 9100 - for PECVD and HDPCVD processes, offering thermal stability, low erosion, good mechanical strength and excellent elastic recovery
Ref 6230 - superior chemical resistance and low contamination from extractables where FDA compliance is required.
Tel: 01332 524400
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Published in Valve User Magazine Issue 24
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