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Springs for Spring Energizes Seals (

 

 

 

Springs for Spring Energizes Seals (SES) made of PTFE or other plastics.

 

 

 

SPRING OVERVIEW:        

 

 

Cantilever Spring:

Cantilever Spring:

Helical Spring:

Canted Coil Spring:

Springs come in different sizes and forms. To choose the right spring for your sealing application, it is essential to understand the characteristics of each spring.

The load versus deflection graph illustrates the behavior of each type of spring. Too much spring force can result in premature wear or excessive friction,

and too little spring force can lead to seal malfunction or poor contact in conductivity applications.

The graph below compares the behavior of Cantilever Springs, Helical Springs, Canted Coil Springs and Full Contacted Spring (further information available on request) which can help to navigate

the direction to choosing the right spring for your sealing application.

 

Functions of the springs

 

Cantilever spring

 

The Cantilever Spring has a large deflection range and is commonly used in spring energized seals.

The V shape design is compressed during installation and provides spring load at the ends of the tabs. 

It is a great choice for medium load applications under static or low speed and is the preferred choice for reciprocating applications.

Sealing Application:

 

 
  • Reciprocating radial and face sealing

  • Slow speed rotary dynamic application

  • Dynamic application up to 260 °C (500 °F)

 

Helical spring

 

The Helical spring has a high load spring with smaller deflection

range. It distributes the load evenly across each individual band. It is commonly used for medium to high load applications under static and is recommended for vacuum and cryogenic sealing application.

Helical spring can also be used by itself for other purposes, such as, EMI shielding or electricity conductivity reasons. Not suitable

for wide gland tolerances, eccentricity, or misalignment.

Sealing Application:

 

 
  • Static radial and face sealing

  • High pressure environment

  • Reciprocating or slow speed rotary dynamic application

 

Canted Coil Spring for axial and radial application:

 

The Canted Coil Spring has a unique curve with a very flat spring rate in a specific working deflection range. It can be customized into differentspring loads. As the seal jacket wears, the force stays constant. It is typically used in dynamic with light

to medium load application. Suitable for wide tolerance and

glands. The design of the spring allows the spring to also perform outstanding tasks on its own such

as electricity conductivity, EMI shielding, as well as mechanical

fastening (locking, latching, and holding).

Sealing Application:

 
  • Friction sensitive applications

  • Reciprocating radial and face sealing

  • Moderate speed rotary dynamic application

  • Dynamic application up to 260 °C (500 °F)

 

 

Dimensions of the spring types:

Cantilever spring

 

Spring material:

 
  • 301=1

  • 316=2

  • Hastelloy C276 =3

 

Size Chart

Item No.

 

Metrics (mm)

Inches  (")

A

B

C

L

J

K

A

B

C

L

J

K

7250

0,50

1,90

0,50

1,20

1,30

0,08

0,020

0,075

0,020

0,047

0,051

0,003

7251

0,50

2,40

0,50

2,00

2,00

0,12

0,020

0,094

0,020

0,079

0,079

0,005

7252

0,50

2,90

1,30

2,80

2,80

0,15

0,020

0,114

0,051

0,110

0,110

0,006

7253

0,50

3,80

1,60

4,50

4,30

0,20

0,020

0,150

0,063

0,177

0,169

0,008

7254

0,50

5,00

2,00

6,50

6,00

0,25

0,020

0,197

0,079

0,256

0,236

0,010

7255

0,90

6,90

2,40

9,00

8,50

0,25

0,035

0,272

0,094

0,354

0,335

0,010

Other sizes, materials, and length are avaliable upon requests.

 

Spring material: Elgiloy

Size Chart

Item No.

 

Metrics (mm)

Inches (")

A

B

C

L

J

K

A

B

C

L

J

K

7260

0,50

1,90

0,50

1,20

1,30

0,08

0,020

0,075

0,020

0,047

0,051

0,003

7261

0,25

2,03

0,76

1,80

2,03

0,12

0,010

0,080

0,030

0,071

0,080

0,005

7262

0,28

2,54

1,02

2,57

2,67

0,15

0,011

0,100

0,040

0,101

0,105

0,006

7263

0,51

3,81

1,40

4,39

4,06

0,20

0,020

0,150

0,055

0,173

0,160

0,008

7264

0,64

5,08

1,91

6,22

5,97

0,25

0,025

0,200

0,075

0,245

0,235

0,010

7265

0,89

5,08

3,81

8,08

9,14

0,50

0,035

0,200

0,150

0,318

0,360

0,020

Other sizes, materials, and length are avaliable upon requests.

 

Dimensions of the spring types:

Helical spring

 

Item No.

 

Metrics

Inches (")

A

B

C

A

B

C

7270

0,05

0,50

1,25

0,002

0,020

0,049

7271

0,08

1,00

2,00

0,003

0,039

0,079

7272

0,08

1,00

2,60

0,003

0,039

0,102

7273

0,12

1,50

4,00

0,005

0,059

0,157

7274

0,15

2,20

5,00

0,006

0,087

0,197

7275

0,15

2,20

6,00

0,006

0,087

0,236

7276

0,15

2,20

7,00

0,006

0,087

0,276

7277

0,30

3,10

8,00

0,012

0,122

0,315

Spring material:

 

 
  • 301=1

  • 316=2

  • 17/7PH=3

  • Elgiloy=4

 

Plating

 
  • Silver

  • Gold

  • Nickel

 

Other sizes, materials, and length are avaliable upon requests.

 

Dimensions of the spring types:

Canted Coil Spring

 

 

 

Series

 

Item No.

 

Metrics

Inches  (")

A

B

C

A

B

C

0

7280L

0,08

0,65

0,69

0,003

0,025

0,027

7280M

0,09

0,64

0,69

0,0035

0,025

0,027

7280MH

0,11

0,66

0,71

0,0045

0,026

0,028

7280H

0,13

0,66

0,71

0,005

0,026

0,028

1

7281L

0,13

1,40

1,52

0,005

0,055

0,060

7281LM

0,15

1,40

1,52

0,006

0,055

0,060

7281M

0,18

1,30

1,42

0,007

0,051

0,056

7281H

0,20

1,22

1,32

0,008

0,048

0,052

2

7282L

0,20

2,18

2,39

0,008

0,086

0,094

7282M

0,28

2,11

2,29

0,011

0,083

0,090

7282H

0,36

2,06

2,26

0,014

0,081

0,089

3

7283L

0,28

2,92

3,15

0,011

0,115

0,124

7283M

0,36

2,90

3,10

0,014

0,114

0,122

7283H

0,41

2,87

3,10

0,016

0,113

0,122

4

7284L

0,41

4,14

4,50

0,016

0,163

0,177

7284M

0,51

4,14

4,47

0,020

0,163

0,176

7284H

0,66

4,04

4,37

0,026

0,159

0,172

5

7285L

0,51

5,46

6,05

0,020

0,215

0,238

7285M

0,66

5,46

5,99

0,026

0,215

0,236

7285H

0,79

5,46

5,84

0,031

0,215

0,230

6

7286L

0,66

8,26

9,19

0,026

0,325

0,362

7286M

0,79

8,26

9,12

0,031

0,325

0,359

7286H

1,04

8,26

8,84

0,041

0,325

0,348

Spring material :

 

 
  • 302=1

  • 316=2

  • Hastelloy C276=3

 

Plating

 
  • Silver

  • Gold

  • Nickel

 

 

Other sizes, materials, and length are avaliable upon requests.