Bellows
Suction Cups are Excellent
for Concave and Convex Surfaces and
Eliminate
the Need for Spring Suspensions in Many Cases 2.5 Bellows Vacuum
Suction Cups attach gently and easily with minimum pressure. They are
excellent for concave and convex shapes as well as on slanted surfaces.
Their design can replace mechanical springs, ball swivels and height
compensators, allowing for less complicated and more economical
installations. Keeping vacuum levels a bit lower extends the life of the
suction cups.
Vacuum Cup
Materials:
The
standard materials are Nitrile (NBR) and Silicone (SIT).
For more information on the
materials, Click Here.
B2.5-5 through B2.5-25
B2.5-32 through B2.5-88
Specifications for 2.5 Bellows Vacuum Suction Cups
The cup capacities shown
above ( *
) are
theoretical capacities based on 24"Hg at sea level with a safety factor of two (2)
and a
±
5% margin of error. This is
the US ANSI ASME Standard B30.20 for vacuum lifter specifications and is commonly used in North America
as a design capacity for vacuum components. When used in vertical
applications, take these values
and divide again by 2 to obtain a 4 to 1 safety factor per the ANSI
specifications. These are realistic working capacities when designing
equipment.
Other manufacturers use a pull-off
figure at 27"Hg to show a high capacity value for their cups. This is
accurate, but requires users to do all the math themselves to build in safety
factors. The
values are basically the same, but it is necessary to calculate the working
capacities with a safety factor via the following formula at sea
level:
Pull-off
value
(at
27"Hg) = ANVER's Listed Capacity x 2 x 1.125 (at 24"Hg)
For example:
ANVER vacuum cup number F52 has a rated capacity of 15.10 lb at
24"Hg. The pull-off capacity at 27"Hg for this cup would be
15.10 x 2 x 1.25 = 33.79 lbs. From this point, it is necessary to
calculate the safety factor based
on the vacuum level being used, and the altitude.
To
ensure safety, 80% of actual overall diameter is used when determining Load
Capacity.
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