Norgren NFPA Aluminum & Steel Cylinders - Manual (Page 10)

ACT-1-10 Brookville, OH USA Phone 937-833-4033 www.norgren.com
Series A & EA, NFPA Aluminum Decel-Air Cushioned Cylinder
Series J & EJ, NFPA Steel Decel-Air Cushioned Cylinder
Explanation of Decel-Air Cushion:
Norgren’s Decel Cushioned cylinder was designed for
applications where high velocity, low mass, material transfer or
machine function is required, and where the kinetic energy to
be absorbed during cushioning exceeds the parameters of our
standard Series EA or EJ air cylinders equipped with non-
adjustable or adjustable cushions. Decel cushions employ
longer-than-standard air cushions to assist our Impact
Dampening Piston Seal.
Why does our Decel-Air Cushion work?
The extra cushion length of the Decel cushioned cylinder
provides an additional deceleration capability to slow the
cylinder’s moving mass to a point where the positive
cushioning effect of our Impact Dampening Piston Seals can
perform the final cushioning.
Norgren’s Decel-Air Cushioned Cylinders
Versus
Cylinder Mounted Shock Absorbers
The first extensive evaluation of pneumatic cylinder cushion
performance was undertaken by the Mechanical Engineering
Department of The Ohio State University. The test was
conducted on 2-1/2” bore, 12” stroke.
The OSU tests found the Decel Cushioned cylinders absorbed
almost three times as much kinetic energy with a lower level of
peak cushion as a standard Ecology seal configured cylinder.
Because air is compressible and is exhausted out of the
cylinder each cycle, the internal heat buildup is minimized. The
“Maximum Inch Pounds Per Hour” rating which is essential in
determining the effectiveness of shock absorber performance
is not needed to judge Decel cushion performance.
The test indicated that Norgren Decel-Air Cushioned cylinders
could prove to be superior to a hydralic shock absorber
assisted cylinder for high cycle, high velocity applications with
light to moderate loading (precisely the area where most
severe cylinder applications exist). The cycle rates and the
cushioning times of the Decel-Air Cushioned cylinders and the
hydraulic shock absorber assisted cylinders were
comparable.*
Decel-Air Cushioned cylinders are also less costly than shock
absorber mounted cylinders and are self-contained units.
*For comparative evaluation, a well-known hydraulic shock
absorber was chosen. The OSU tests showed a smooth shock-
absorbing operation was achieved at very low velocities using
the shock absorbers, but at comparable Decel Cushion cylinder
velocities, a high mechanical impact took place on the shock
absorber mounted cylinder.
Potential Decel-Air Cushion Applications
1. Conveyors & Material Handling Equipment
2. Transfer Machines & Shuttle Tables
3. Packaging Machinery
4. Foundry Equipment
5. Automatic Gate Opening & Closing
Decel-Air™ Cushioned Cylinder
Eliminates the need for shock absorbers on air cylinder applications.
Ultra Cushion Seals are made of nitrile*
captured within a precision machined groove.
The seal’s linear and radial “float” eliminates
misalignment and provides exceptionally fast
“out of cushion” stroke reversal.
*Nitrile seals on the 5/8" and 1" rod diameter. For rod
sizes 1-3/8" and larger urethane seals are standard.
Extra cushion sleeve and
stud length for longer
deceleration
Decel-Air Cushion Spacer
Block allows for extra
cushion length and longer
deceleration
Impact Dampening
“Ecology” Piston Seals
absorb final impact and
provide end of stroke
cushioning assistance.
Adjustable Captive
Cushion Needle is a
one-piece, precision
threaded brass cushion
adjustment screw with a
threaded steel capture
ring. It provides safe and
precise cushion
adjustment