Pinch valves improve silo isolation
A
Larox Flowsys product story
Edited by the Engineeringtalk editorial team
Mar 19, 2009
Concerning shut-off and control solutions, pinch valves are one of the best technologies for the isolation of pneumatically conveyed cement, according to Larox Flowsys.
With pinch valves, a rubber tube or sleeve is pinched by steel bars on the centreline of the valve to close.
Self-cleaning pinch valves provide 100 per cent tight shut-off even if solids have built up on the sleeve wall.
When compressed, any crystallised particles flake off the sleeve surface and are washed downstream.
In the open position, the valve is at full bore with no flow restrictions thus making the valve an integral part of the pipeline.
During closing, two pinch bars squeeze the sleeve shut on the centreline.
The pinch valve itself is rather simple to build; however, the sleeve inside is not.
Making quality sleeve demands knowledge of elastomer technology to mix the right rubber for each application.
'Many cement companies agree that high-quality pinch valves are the best valve solution for silo isolation because they have long service intervals, they are easy to operate, are easy to repair and they have very low cost of ownership,' said Jani Akkila, area sales manager, Larox Flowsys Group.
Even if the pinch valve sleeve is beginning to fail, the valve sleeve can still be closed to prevent silo contamination.
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Tel +358 201 113 311
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Pinch valves designed for wearing processes
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Larox Flowsys gained ISO9001 certification in 1997 and is the only known pinch valve manufacturer that has been awarded this quality certificate for all of its operations. -
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