Chemical TechnologySept 2015

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Chemical Technology • September 2015
PetrochemicalsCOVER STORY
hygiene and sanitation standards,” explained Darpin.
Chris Frauenstein, Managing Director of Instruments4You
commented: “When chocolate ismanufactured and becomes
a liquid state, then all pipelines need to be heated to keep
product fromdrying and becoming like concrete. This is done
by passing warm water through jacketed pipework. GEMÜ
valves have been used to shorten the dead space between
flanges (where they do not have the space to jacket the
pipework)”.
Technical data
The GEMÜ Victoria butterfly valves range in size from DN
25-DN 600 and offer manual, and pneumatically operated
options with traditional Normally Closed, Normally Open and
Double Acting action. A complete range of measurement
and control systems, designed by GEMÜ to suit the exact
requirements of valves to be operated as ON/OFF or control
valves, complements the scope of products which GEMÜ is
offering to industrial customers.
Maximumoperatingpressures of 16bar andoperating tem-
peratures of up to150 ºC (depending on version andmaterials
used) can be matched by using the seal material accordingly.
Most commonly materials used are EPDM, NBR and FPM.
The mirror polished disc surface of the valve offers a high
surface quality which prevents particle build-up making it
easier to clean and providing more stringent security where
hygienic conditions are important.
The butterfly valves have undergone rigorous testing at the
GEMÜ testing laboratory, based in Germany, which is able to
test to the most varied of customised cleaning and sterilisa-
tion requirements such as CIP/SIP, as well as conducting
validation and quality testing. Temperature and cycle simu-
lation tests are also conducted for warranty specifications.
The lifespan and reliability of elastomeric seated butterfly
valves is largely dependent on the choice of valve liner; this
is why the white NBR liner was utilised in the Eastern Cape
chocolate plant as it complies with all global hygiene stan-
dards, including the UK’s Water Regulatory Advisory Scheme
(WRAS). In addition it offers a long working life span.
Furthermore, GEMÜ supplies solutions for filling, cleaning,
mixing, separating, sterilising, autoclaving and pasteurising
machines and plant, with all design conforming to the EU
framework regulation 1935/2004.
Further information is available from: Claudio Darpin, Manag-
ing Director, GEMÜ Valves Africa on tel: +27 11 462 7795 or
email: and Chris Frauenstein,
Managing Director, Instruments4You on tel: +41 451 0614
or email: z
Powder feed line Tank bottom valve and manual shut-off valve, both with
electrical position indicator LSR