A problem existed in Pennsylvania at the Upper Gwynedd
Towamencin County Authority wastewater treatment plant, in the secondary
treatment phase. The submerged plug valves in the aeration tanks were becoming
progressively harder to operate as the years passed.
After months of operating the plug valves with a large pipe
wrench to overcome the high torque, the valves became just too hard to operate.
The solution to this problem was a Style 2100BG - Extended
Bevel Gear Pinch Valve with a sealed body, from Flexible Valve Corporation.
Since the only valve part exposed to the sludge is a smooth and continuous
neoprene sleeve, which has the same diameter as the adjoining pipe throughout
its length, there is no crevice in the valve where debris can build-up that could
eventually prevent the valve from operating. The operational torque of a pinch
valve is the same on day one as it is after many years.
The Series 2100 is a completely enclosed, manually operated
pinch valve used extensively in controlling of slurries and corrosive flows.
Designed to be dependable and cost effective, the Series 2100 has found its
niche in tight places within piping systems. Its short face-to-face dimensions
conform to ANSI B16.10 lengths ? making it useful as a replacement for gate,
plug, and ball valves.
The Flex-Valve rubber sleeve is the only part of the valve
exposed to the line process. For flow control or shut-off, the rubber sleeve is
pinched by the clamping effect of the mechanism at the center of the sleeve.
When the valve is in the open position, the smooth, unbroken contour assures
unobstructed flow without dead spots or cavities.
Features of the 2100 Series include the following:
? Conforms
to ANSI B16.10;
? Flanges
tapped for ANSI 125/150 lb.;
? Standard
duty;
? Pinch
from top and bottom to center;
? Position
indicator;
? Completely
enclosed;
? Full
round through entire length;
? Full
flat faced elastomeric flanges;
? Vertical
enclosure split line for complete accessibility
to all internal components;
? Can
be installed in any position;
? Non-rising
handwheel stem; and
? Positive
opening device if needed.
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At the Upper Gwynedd Towamencin County Authority wastewater
treatment plant, one 6-in. Style 2100BG valve was submerged in each of four
aeration tanks and used to control the flow of seed sludge, with 0.5% solids,
from the sedimentation tank and back into each of the aeration tanks
themselves. There was also a main 8-in. 2100BG valve that was submerged just
after the sedimentation tank, to be used as the main shut-off. This proved to
be a good solution to the plant?s problem.
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For additional information, phone Flexible Valve Corp. at
201-641-4700.
