Catalog excerpts
ORIGINATOR OF THE ROLLING DIAPHRAGM The Rolling Diaphragm Concept . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Theory of Rolling Diaphragm Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3Typical Diaphragm Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3Rolling Diaphragm Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....
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IMPOR T ANT NOTICE Our recommendations, if any, for the use of this product are based on tests believed to be reliable. The greatest care is exercised in the selection of our raw mate-rials and in our manufacturing operations. However since the use of this product is beyond the control of the manufacturer, no guarantee or warranty, expressedor implied is made as to such use or effects incidental to such use, handling or possession or the results to be obtained, whether in accordance with the directionsor claimed so to be. The manufacturer expressly disclaims responsibility therefore....
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ORIGINATOR OF THE ROLLING DIAPHRAGM The Bellofram Rolling Diaphragm > ✣ () is a tough, flexible seal with a unique configuration that permitsrelatively long piston strokes while completely eliminating sliding friction.Formed in the shape of a truncated cone, or top hat, the diaphragm is turned in on itself when installed so that,during the stroke, it rolls and unrolls alternately on piston skirt and cylinder wall. The rolling action is smooth and effortless, completely eliminating sliding contact and breakaway friction. With the outer flange clamped to the cylinder and the center fastened...
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ORIGINATOR OF THE ROLLING DIAPHRAGM Bellofram Rolling Diaphragms are, in effect, pressure vessels having a variable volume and flexible moving side-walls. As in any other pressure vessel, their strength should be considered with respect to safety factors. Generally, they are designed with a large safety factor. This means the maximum safe working pressure will be a fraction of the pressure that could cause failure of the sidewall.The accompanying illustration, Fig. 3, illustrates the pressure reaction of the . Here it can be seen thatalmost the entire pressure load is supported by the...
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ORIGINATOR OF THE ROLLING DIAPHRAGM > Piston DC (CylinderBore) C (Convolutionwidth) DP (PistonO.D.)PistonCorner Radius (RP) CylinderElastomerSide Diaphragmas Molded Fabric Side Cylinder Corner Radius(RL) DiaphragmAfter Inversion for Installation orPreconvolutedDiaphragm > WHWSWF Rad.WF WSW F Rad. F Rad. HE Rad. K WF WH DF DF
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ORIGINATOR OF THE ROLLING DIAPHRAGM The purpose of this Design Manual is to guide you in the selection of the proper Bellofram Rolling Diaphragm() for your application as well as to describe the applicable hardware design criteria.To efficiently select a diaphragm and to design hardware, it is advisable that decisions be made in logicalsequence. The information in this Manual, presented in detail on the following pages and briefly below, is in such sequence. The first step is to complete the Design Parameter Sheet*. This will provide basic information that will aid you in making selections...
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ORIGINATOR OF THE ROLLING DIAPHRAGM > (note 4) DC .25 .99 1.00 ֖ 2.50 2.51 4.00 4.01 ֖ 8.00 8.01 and up H As required to yield design stroke (See standard size tables & NOTE3) DC Tolerances on DCand Dp are .010" per inch of diameter but the tolerance will be no less than ѱ.010"or greater than .060" Dp WH& WF .020 ѱ.005 .020 .005 .030 ѱ.005 .035 .005 .045 ѱ.007 WSW .015 .003(Code ѓB) .017 Ա.003(Code CӔ) .024 .004(Code ѓD) .035 Ա.005(Code FӔ) .045 .007(Code ѓH) E 3/32 R. 1/8 R 5/32 R 1/4 R 1/4 R F 1/32 R 1/16 R 3/32 R 1/8 R 1/8 R DF DC+ 3/4"See Note 4 DC+ 1"See Note 4 DC+ 1 > 1 ԢD > 2 "See...
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Cylinder Bore DC Piston DiameterDP Height H SidewallThickness Wsw Effective PressureArea Ae (in) Convolution C Maximum HalfStroke SA/SB Cylinder Bore DC Piston DiameterDP Height H SidewallThickness Wsw Effective PressureArea Ae (in) Convolution C Maximum HalfStroke SA/SB >
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Cylinder Bore DC Piston DiameterDP Height H SidewallThickness Wsw Effective PressureArea Ae (in) Convolution C Maximum HalfStroke SA/SB Cylinder Bore DC Piston DiameterDP Height H SidewallThickness Wsw Effective PressureArea Ae (in) Convolution C Maximum HalfStroke SA/SB >
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Cylinder Bore DC Piston DiameterDP Height H SidewallThickness Wsw Effective PressureArea Ae (in) Convolution C Maximum HalfStroke SA/SB Cylinder Bore DC Piston DiameterDP Height H SidewallThickness Wsw Effective PressureArea Ae (in) Convolution C Maximum HalfStroke SA/SB >
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ORIGINATOR OF THE ROLLING DIAPHRAGM Involuted Diaphragms may be made depending on design parameters. D > ESCRIPTION The patented* Bellofram Involuted Diaphragm (IVD) > TM represents a new concept in rolling diaphragm design.Developed initially to satisfy the needs of the automotive industry for low-cost hardware, small package size and lower assembly cost, the design offers significant advantages over convoluted diaphragms in many applications.Involuted diaphragms differ in both configuration and operation from the conventional designs. IVD diaphragmsidewalls drop almost straight down from...
Open the catalog to page 23
ORIGINATOR OF THE ROLLING DIAPHRAGM > Fabric normally used is: Code B, for all top hat sizes with: Code C, for all top hat sizes with: > DC 2 > 1 ڢD > 2 "(any height)or2 DC> 4"(any height)or2 > 1 ⁄ > 2 " < DC 4"H < DC /2 > 1 ⁄ > 2 " < DC 4"H > DC /2 Code P, for all preconvoluted sizes. > ABRIC SE Fabric Code Type Strength factor Duty A Polyester 17 General Purpose (Top Hat) B Polyester 28 General Purpose (Top Hat) C Polyester 47 Heavy Duty (Top Hat) P Polyester 32 General Purpose (CӔ Style) V Nomex 23 High Temperature L Polyester 44 Heavy Duty (Top Hat) W Polyester Knit 1.8 Light Duty 259...
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