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Standard Cylinder
Downloadable Files:
Diaphragm Cylinders Catalog Pages (including Mounting Option & Dimensions) (652KB)
Standard Cylinders
  • Extremely Sensitive Response
  • Very Low Friction
  • No Edge Seals To Replace
  • No Blow-By Leakage
Product Detail:

Diaphragm Air Cylinders are actuators made from elastomers, engineered metals and fabrics. They require no lubrication, are virtually frictionless, and economical. They can be used to provide lifting, clamping, pushing, coining, turning, and other linear force or actuation motions in many applications.

The development of the long stroke rolling diaphragm for dynamic sealing proved to be the solution for many applications requiring low friction, no lubrication, low leakage, wide temperature variations, and low total cost. The popularity of the rolling diaphragm as a sealing means led to many requests for a standard line of “off the shelf” diaphragm cylinders; single and double acting, short and long stroke with a wide selection of effective areas. To meet these requests, the long stroke rolling diaphragm cylinder was developed and Bellofram has supplied many thousands of them since their 1965 introduction.

Standard Bellofram Air Cylinders are available in eight sizes. Each size is available in both a spring-return and a double-acting variety, with one or two stroke variations (Series E or F). Sizes 4 and 6 have impact-extruded aluminum shells. Larger sizes have steel shells. Rods are ground, polished and hard-chrome plated steel. Bearings are sintered bronze, molybdenum disulphite impregnated. Other components are high strength materials with suitable corrosion resistant treatment.

  • Bellofram engineers will help you define your specific needs.
  • All Standard cylinders can be ordered with either no spring, or no bearing, as standard options.
  • Standard cylinders can be ordered with one of six different mounting options.
Operating Data
Size (Effec. Area) Sq. In.
Equiv. Bore Diam. In.
Single Acting/Spring Return
Double Acting
Stroke +.03 -.12 Series E In.
Stroke +.03 -.12 Series F In.
Approx. Spring Force - Zero Stroke (lbs.)
Approx. Increase Force Per In. of Stroke (lbs.)
Stroke +.03 -.12 Series E In.
Stroke +.03 -.12 Series F In.
Series E
Series F
Series E
Series F
4
2.3
1.8
6
3
1.3
6
2.8
2.4
9
4
1.9
9
3.4
2.2
3
17
12
4
4
2.5
12
3.9
2.3
3.6
18
18
6
6
1.8
3.1
16
4.5
2.62
4.2
24
24
8
8
2.1
3.7
24
5.5
2.6
5.24
36
36
11
11
2
4.6
30
6.3
3.07
6
45
54
13
14
2.4
5.4
36
6.8
3.55
6
54
54
16
14
2.9
5.4
Part Numbers:
Create Part Number:
X
XX
X
XX
XXX
S
Single Acting/Spring Return Type
D
Double Acting
XX
Area in Square inches 04, 06, 09, 12, 16, 24, 30 or 36 Size
E
Series E or F: Determines Stroke
See Operating Data Table above. 		Series
F
BP
   Bellofram Product Standard Rod
SM
   National Fluid Power Assc. Standard
N
 Nose Mount Mounting
UM
 Universal Mount
FM
 Foot Mount
CFM
 Cap Flange Mount
HFM
 Head Flange Mount
CBM
 Clevis Bracket Mount
CBS
 Clevis Bracket Stud

Notes: Add to end of ordering data
NS-No Spring
NB-No Bearing
NBS-No Bearing or Spring
Example:D-as-F-BP-CBM is a double acting, 12 sq. in., 3.1" stroke, BP rod end cylinder with Clevis Bracket Mount.

Options:
Repair Kits:
Repair Kits are available to permit user in-plant maintenance without delay and expense of returning parts to the factory. Each kit includes installation instructions. Nameplate data of the cylinder must accompany order to insure receipt of correct parts.
The following is included in the repair kits:
Spring Return Diaphragm Kit
1. Diaphragm, Cap
2. Adhesive, Cap
3. Nuts, Cap Retainer
4. Instructions
Spring Return Bearing Kit
1. Inner Bearing
2. Outer Bearing
3. Rod Wiper
4. Instructions
Double Acting Diaphragm Kit
1. Diaphragm, Cap
2. Diaphragm, Head
3. Adhesive, Cap
4. Adhesive, Head
5. Rivets, Blind (or screws)
6. Nuts, Cap Retainer
7. Seal “O” Ring
8. Instructions
Double Acting Bearing Kit
1. Inner Bearing
2. Outer Bearing
3. Rod Wiper
4. U-Cup Seal
5. Instructions

Breather Vents:
Breather vents are available for use on Bellofram Spring Return Air Cylinders.
The Breather, which contains a 40 micron bronze filter, is simply threaded into the air relief port of the cylinder head. It prevents foreign matter from being drawn into the cylinder on the return stroke of the piston, and also acts as a snubber. The snubbing reduces the piston speed and impact at the end of the stroke in both directions.
Ordering Data:
Breather Vent for 1/4" pipe tap
(Fits cylinder sizes 4, 6, 9)
Part No. 661-000-001
Breather Vent for 3/8" pipe tap
(Fits cylinder sizes 12, 16, 24, 30, 36)
Part No. 661-000-002
   
Product Contact:
Sales Contact
Technical Contact
Specifications:
Plant Air
Up to 145 psig (10 BAR)
Temperature Range
 -40º to 225º F (-40º to 107º C)
-75º to 400º F (-60º to 204º C)
Materials of Construction Body: Sizes 4 and 6 are impact-extruded
aluminum shell. Larger sizes are made
from a steel shell.
Diaphragm: Neoprene® elastomer reinforced with Flex-Weave Dacron® fabric.
Rods: Ground, polished and hard-chrome plated steel.
Bearings: Sintered bronze, molybdenum
disulphite impregnated.
Other components are high strength materials with suitable corrosion resistant treatment.
Testing All cylinders are leak-tested prior to shipment. However, the cylinder is not a bubble tight assembly
External stroke limiters should be provided by the customer to limit the stroke in both directions on both single-acting and double-acting cylinders.
Installation and operation procedures furnished with each cylinder should be followed for maximum service life.
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