RPP engineering presentation
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Transcript of RPP engineering presentation
History of the Diaphragm Seal
Concept of the diaphragm goes
back centuries
Leather diaphragms were used in
pumps in ancient times
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History of the Diaphragm Seal
Fabric reinforced elastomeric diaphragms were
developed in the early 20th century
Long stroke rolling diaphragms were developed
in the late 1940’s
– Fabric preforming
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RPP Corporation History
Lynn
Boston
Established in 1963 in Lynn, Massachusetts
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Boston
Lawrence
RPP Corporation History
Focused in industrial markets primarily process
control and water management
Moved to 55,000 square foot facility in Lawrence,
Massachusetts
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RPP Corporation History
Established sales and distribution facility
in Kehl-Kork, Germany in 2000
Employ about 130 people in both facilities
Berlin
Kehl-Kork
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RPP Corporation History
Material development
Diaphragm development
Performance analysis
Product Development Capabilities
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Diaphragm Application Requirements
Conversion of pressure to force
Seal Requirements
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O-Ring Function
Rolling Diaphragm Function
Diaphragm Application Requirements
Sensitivity to pressure differentials
No breakaway friction
Zero leakage
Application Requirements
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Design Parameters to Meet
Application Requirements
Effective Area
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Design Parameters to Meet
Application Requirements
Stroke
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Design Parameters to Meet
Application Requirements
Economical hardware design
Hardware Design Requirements
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Design Parameters to Meet
Application Requirements
Pressure Capability
Convolution
Width
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Design Parameters to Meet
Application Requirements
Temperature Capability
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Design Parameters to Meet
Application Requirements
Operating Media Compatibility
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Design Parameters to Meet
Application Requirements
Cycle Life Requirement
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Typical Applications
Process Control Valves
Input
OutputProcess
Process
Controller
Feedback Signal
Signal Pressure
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Typical Applications
Pressure Regulators
Input
Output
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Typical Applications
Irrigation Valves
Input
Output
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Typical Applications
Web Tensioning
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Conversion of Application Requirements
to Diaphragm Requirements
Effective Area = Diameter
Diaphragm Geometry
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Conversion of Application Requirements
to Diaphragm Requirements
Stroke = Height
Diaphragm Geometry
RP
1.56 Convolution
Width
RF
1/2 Stroke
Convolution Width
2
RP / RF
1/2 Stroke
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Conversion of Application Requirements
to Diaphragm Requirements
Hardware Design = Flange Design
Diaphragm Geometry
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Conversion of Application Requirements
to Diaphragm Requirements
Pressure Capability = Fabric Specifications
Diaphragm Materials
Convolution
Width
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Conversion of Application Requirements
to Diaphragm Requirements
Temperature Capability =
Fabric and Elastomer Specifications
Diaphragm Materials
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Conversion of Application Requirements
to Diaphragm Requirements
Operating Media = Elastomer Specifications
Diaphragm Materials
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Conversion of Application Requirements
to Diaphragm Requirements
Cycle Life Requirement = Fabric to Elastomer Adhesion
Diaphragm Quality Criteria
Fabric
Elastomer
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Conversion of Application Requirements
to Diaphragm Requirements
Flexibility = Thickness and Tolerances
Diaphragm Quality Criteria
Molded
Dimension ± 2%
Molded
Dimension ± 2%
Processing
Dimension
± 30%
Die-Cut Dimension ± 0.5%
Processing
Dimension
± 15% Processing
Dimension ± 4%
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Conversion of Diaphragm Requirements
to Diaphragm Design
Height to diameter ratio
Manufacturing Considerations
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Conversion of Diaphragm Requirements
to Diaphragm Design
Material processing limitations
Manufacturing Considerations
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Conversion of Diaphragm Requirements
to Diaphragm Design
Flange beads
Manufacturing Considerations
33
Conversion of Diaphragm Requirements
to Diaphragm Design
Rolling (top hat)
Diaphragm Style
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Conversion of Diaphragm Requirements
to Diaphragm Design
Pre-convoluted
Diaphragm Style
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Conversion of Diaphragm Requirements
to Diaphragm Design
Offset-convoluted
Diaphragm Style
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Conversion of Diaphragm Requirements
to Diaphragm Design
Dished
Diaphragm Style
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Conversion of Diaphragm Requirements
to Diaphragm Design
Single-coated
Diaphragm Construction
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Conversion of Diaphragm Requirements
to Diaphragm Design
Double-coated
Diaphragm Construction
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Conversion of Diaphragm Requirements
to Diaphragm Design
Bleed-thru
Diaphragm Visual Quality Criteria
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Conversion of Diaphragm Requirements
to Diaphragm Design
Strike-thru
Diaphragm Visual Quality Criteria
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Conversion of Diaphragm Requirements
to Diaphragm Design
Fabric impression
Diaphragm Visual Quality Criteria
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Conversion of Diaphragm Requirements
to Diaphragm Design
Voids and non-fills
Diaphragm Visual Quality Criteria
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Conversion of Diaphragm Requirements
to Diaphragm Design
Adhesion
Diaphragm Visual Quality Criteria
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Validation of Diaphragm Design
to Application Requirements
Diameter = Effective Area
– Piston Diameter
– Cylinder Bore Diameter
– Effective Diameter
Validation of Diaphragm Design
to Application Requirements
Height = Stroke Requirement
– Overall Height / Piston Diameter
– Convolution Height / Convolution Width
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Validation of Diaphragm Design
to Application Requirements
Materials = Pressure, Temperature
and Media Requirements
– Elastomer Selection / Temperature and Media
– Fabric Selection / Working Pressure and Media
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Validation of Diaphragm Design
to Application Requirements
Quality = Performance Requirements
– Fabric to Elastomer Integrity
– Visual Quality Criteria
– Dimensions
– Materials
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RPP CORPORATION
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