Norgren NFPA Aluminum & Steel Cylinders - Manual (Page 9)

Brookville, OH USA Phone 937-833-4033 www.norgren.com ACT-1-9
Series J & EJ, NFPA Steel Air Cylinders (ø1-1/2" to 12"), Technical Features
Operating Temperatures:
Series J -20°F to 200°F
(-29°C to 107°C)
with Viton Seals -20˚F to 400˚F
(-29˚C to 204˚C)
Operating Pressure:
250 PSIG Air (17.2 Bar)
400 PSIG Hydraulic (27.6 Bar)
Bore Sizes: 1-1/2", 2", 2-1/2", 3-1/4",
4", 5", 6", 7", 8", 10", 12"
Supply:
Filtered compressed air to 250 PSI Petroleum
based hydraulic fluid to 400 PSI
Side Loading:
Cylinders are specifically designed to push and
pull. Side loading (misalignment)
of the piston rod should be avoided to ensure
maximum operating performance and life.
Care should be taken during installation
to properly align the load to be moved with the
center line of the cylinder.
The use of a rod alignment coupler (see page
ACT-1-94 is strongly recommended whenever
possible.
Lubrication:
None required
Norgren Air Cylinders are rated for “no lube
added” service. All internal components are
lubricated at time of assembly with a Teflon
®
based grease.
Materials:
Head and End Caps: precision
machined steel
Tube: 6063-T832 aluminum, clear
anodized O.D., hard coat anodized I.D.
Rod: hard chrome plated steel
Piston: machined high-strength
aluminum alloy
Rod Bearing: oil impregnated sintered iron
Seals: nitrile rod seal, urethane rod wiper,
nitrile piston seals, nitrile tube
end seals
Tie Rods: high-tensile strength steel
Air Cylinder Selection:
The proper application and selection of an air
cylinder requires full consideration of the
following: the fluid medium, operating
pressures, mounting style, length of stroke,
type of rod connection to the load, thrust or
mounting tension on the rod, mounting
attitude, speed of the stroke and how the load
motion will be stopped.
The data that follows provides the necessary
information in the evaluation of
an average application and will help you in
selecting the proper cylinder model and size
for your particular application.
Note: 1-1/2", 2", 2-1/2", 3-1/4", 4" and 5" bore
cylinders with 1/2" to 2" strokes will be
furnished with a short head cushion sleeve
and short cap cushion spear.
Only available on 5/8" and 1" rods.
The above specification applies to Series J
cylinders with optional non-adjustable or
adjustable cushions.
Series J Fixed Cushions
Piston and rod
assembly for
1-1/2" thru 5"
bore cylinders
with 1/2" to 2" stroke.
On the reverse stroke the EJ seal releases its compressive
energy to propel the piston away from the end caps,
producing an immediate breakaway. As the piston continues its travel to the point of impact
with the end caps, the compressive qualities of the EJ seal
provide the final decelerating force. This action compresses
the EJ seal and absorbs the remaining kinetic shock
vibration and noise created by the impact. As the cushion spear enters the cushion cavity, the
exhaust port becomes sealed off creating an air brake. This
provides the initial deceleration in piston speed. The
oversized air cushion bleed orifice permits the cushion
pressure to exhaust with minimal restriction. This allows
the piston to move quickly and smoothly through the
cushion length.
A Major Design and Performance Breakthrough in Air Cylinder Cushioning Systems!
Norgren’s advanced cushion design features a unique, one-
piece, nitrile compound seal that is captured within a
precision machined groove. This allows both linear
and radial “float” of the cushion seal which
virtually eliminates problems associated
with misalignment. Integral flow paths
molded in the periphery of the seal provide
exceptionally fast “out of cushion” stroke
reversal without the use of ball checks.
Ultra Cushion ®
Figure 1 Figure 2 shows spear
exiting cushion seal.
Cushion Function