Norgren ecology cylinders offer these advantages, Operates quietly to meet osha specifications, Summary of sound levels in decibels – Norgren NFPA Aluminum & Steel Cylinders User Manual
Page 8: Act-1-8
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ACT-1-8
Brookville, OH USA
Phone 937-833-4033
www.norgren.com
Series J & EJ, NFPA Steel Air Cylinders, Impact Dampening Seals
PSI
Cylinder Bore
1
1
/
2
2
2
1
/
2
3
1
/
4
4
5
6
7
8
10
12
0
.14
.15
.17
.19
.22
.25
.28
.32
.32
.36
.40
20
.10
.10
.12
.14
.16
.18
.20
.22
.22
.24
.26
40
.07
.07
.08
.09
.10
.12
.13
.14
.14
.15
.16
60
.04
.04
.05
.05
.06
.07
.07
.08
.08
.09
.10
80
.02
.02
.02
.02
.03
.03
.03
.04
.04
.04
.04
100
0
0
0
0
0
0
0
0
0
0
0
In/Sec
Cylinder Bore
1
1
/
2
2
2
1
/
2
3
1
/
4
4
5
6
7
8
10
12
6
155.6
275.5
499.8
969.3
1505.4
2603.2
4159.8
5794.2
8067.6
12,242
20,139
12
38.4
68.1
123.4
239.7
372.6
644.8
1030.2
1435.8
2000.4
3026
4971
18
16.7
29.7
53.7
104.6
162.8
282.1
450.6
628.7
876.8
1319.3
2162.1
24
9.2
16.3
29.4
57.3
89.4
155.2
247.8
346.2
483.6
722
1179
30
5.6
10.0
18.1
35.4
55.4
96.4
153.9
215.4
301.6
445.5
724
36
3.7
6.7
11.9
23.5
37.0
64.5
102.9
144.4
202.7
295.3
476.8
42
2.6
4.6
8.2
16.3
25.8
45.3
72.2
101.6
143.1
204.8
327.7
48
1.8
3.2
5.8
11.7
18.6
32.8
52.2
73.8
104.4
146
231
54
1.3
2.4
4.2
8.5
13.6
24.2
38.5
54.7
77.9
105.7
164.7
60
1.0
1.8
3.0
6.2
10.1
18.1
28.7
41.1
58.9
76.9
117.2
Energy Absorption
Capacity of the Impact
Dampening Seals
The impact-dampening
Piston Seals in the Series EJ cylinder
allow for guaranteed, repeatable cushioning.
The compressive qualities of the piston seals are
predictable. The degree of seal compression at
various supply pressures is documented. (See
Energy Absorption Chart.) This allows you to
compute the exact cylinder size required by
knowing the weight (pounds) you are stopping
at a given speed.
Series EJ cylinders have a impact dampening
piston seal that accomplishes 80% of the actual
load stopping. The air cushion accounts for only
20%. (A conventional air cushioning cylinder
depends 100% on the compressibility
of air to do the stopping.) The EJ seal absorbs
high impact loads allowing the effect of the air
cushion
to be reduced by using a larger air cushion bleed
orifice. As a result the piston can move at a faster
speed for a longer period of time before the EJ
seal does the final stopping. See illustration at top
of ACT-1-9 for cushion operation.
3
Norgren Ecology Cylinders offer these advantages:
Norgren Guarantees
Non-lubricated Operation
for a Full Year!
The piston rod is self-lubricated by the
oil-impregnated rod bearing during operation.
Lubrication between piston and cylinder barrel
is derived from the polishing qualities of the
reinforced Teflon
®
wear ring.
The low friction surfaces extend the life of the
seals beyond normal expectations, permitting
Norgren to unconditionally guarantee non-
lubricated operation for one full year.
See page ACT-1-98 for complete warranty.
Series EJ cylinders are NFPA interchangeable
and are available in many different mounting styles.
Operates Quietly
to Meet
OSHA Specifications.
Series EJ cylinders provide substantial reductions in
impact noise, which reduces overall machine noise
and helps meet government regulations.
The summary of sound decibels chart illustrates the
operating sound levels.
The impact dampening qualities of the
Piston Seals are guaranteed for ONE FULL YEAR!
1
2
Summary of Sound Levels in Decibels
+ Peak sound pressure is given in decibels (dB)
re:2 x 10
5
N/m
2
.
++End position of mike was 3' on centerline from end of
cylinder; side position of mike was 3' perpendicular to
centerline abeam of end of cylinder.
Note: At 5 feet, cylinder sound levels would be less by 9 dB
from side figure and 13 dB from end figure. The total noise
emitted will depend on the structure to which the cylinder is
attached. If it is mounted on a thin flat plate of considerable
area, the noise will be increased by a sounding board effect.
Effect of Impact Dampening Seals on Total Stroke of Cylinders
*The weight of the cylinder piston has been deducted from the figures shown above.
Note: The use of Viton
®
Seals limits the absorption of the impact dampening seals by 50%.
Energy Absorption Capacity of the Impact Dampening Seals
*Usable Pounds Stoppable at the Following Piston Speeds
This chart features the energy absorption capacity of the impact dampening piston seals
with a Non-Adjustable cushions. For higher loads and velocities please refer to the Decel- Air
Cushion option on ACT-1-10.
Note: These figures are for new cylinders. The impact dampening seals will take some compression set during operation
of the cylinder and the stroke loss will decrease. Also, the pressure at zero stroke loss will decrease to about 80 psi.
At pressures above those of zero stroke loss, a slight clicking sound may be produced during impact.
To determine the stroke loss for either the head or cap end, divide the value shown by 2.
PSI Air Sound
Cylinder Model
Pressure
J133B3
EJ155B3
J1133A3
EJ1155A3
Level+
5" x 6"
5" x 6"
2" x 6"
2" x 6"
95
End++
108
73
110
74
PSI+
Side++
112
84
110
81
50
End++
108
73
113
74
PSI+
Side++
113
85
110
81
In/Sec
Cylinder Bore
1
1
/
2
2
2
1
/
2
3
1
/
4
4
5
6
7
8
10
12
6
279
495
899
1,744
2,709
4,685
7,486
10,429
4,520
22,035
36,250
12
68
122
221
430
699
1,159
1,854
2,583
3,800
5,446
8,947
18
30
53
95
187
291
507
810
1,130
1,576
2,374
3,891
24
16
29
52
102
160
279
444
622
869
1,299
1,414
30
10
18
32
63
99
172
275
387
541
801
1,303
36
6.7
12
21.6
42
66
116
183
259
363
531
856
42
4.7
8.3
14.7
29
46
81
129
181
257
367
588
48
3.4
5.7
10.4
21
33
59
93
131
187
262
415
54
2.3
4.3
7.6
15.3
24
43
68
97
138
189
295
60
1.8
3.2
5.4
11
18
33
52
74
106
138
211
Energy absorption capacity of the impact dampening
piston seals with an adjustable cushion.