O-ring 设计规范与详细规格选用

O-ring 设计规范与详细规格选用

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O-ring 设计规范与详细规格选用

O-ring 设计规范与详细规格选用

ChapterSEAL GLAND DESIGN

The proper design of an O-ring gland is a criticalStatic Face Seal, Rectangular Gland step in attaining optimum seal performance.Internal Vacuum/External PressureThis chapter provides the information necessary to

select the recommended O-ring gland dimensions

for a specific type of application, and to select the

corresponding standard O-ring or Dovetail®Seal,

along with its AS 568A dash number. The dash

numbers are identical for O-rings and Dovetail

Seals. (See Chapter 3 for information on creating

part numbers for O-rings, and Chapter 4 for

information on creating part numbers for

Dovetail Seals.)Figure 7-1

The gland dimension recommendations presented

in the tables of this chapter represent a significantIf the O-Ring Dash Size Is Knownamount of work done by SAE. These dimensions,Step 1.Locate the dash number in Table 7-10,when used in conjunction with standard AS 568Abeginning on page 50, to determine the O-ring’sdash number O-rings, virtually assure satisfactorydimensions from columns “B” and “C.”sealing functionality. A seal extraction groove is

recommended whenever possible. This reduces theStep 2.Select the corresponding gland I.D. fromchance of damage to the gland when removing andcolumn “D.”

replacing the seal.

Step 3.Determine the appropriate gland cross-

To determine recommended gland dimensions,section dimensions, see Table 7-3, page 46. standard O-ring sizes and AS 568A dash numbers,

the designer should first select the intended sealingStep 4.To calculate the gland O.D., add 2X theapplication from the following list and refer to thegland width to the gland I.D.

indicated page and tables. Selecting the O-Ring Dash Size

1.Static Face Seal, Rectangular Gland — Internal

vacuum/external pressure, page 45.If the O-ring dash size is not known and all gland

dimensions are known:

2.Static Face Seal, Rectangular Gland — InternalStep 1.Locate the dimensions of the gland’s cross-pressure/external vacuum, page 47.section in Table 7-3, page 46.

3.Static Face Seal, Dovetail Gland — Any pressureStep 2.Select the corresponding O-ring dash sizecombination, page 48.series that matches the gland’s cross-section

dimensions.

4.Static I.D./O.D. Seal, Rectangular Gland — Any

pressure combination, page 59.Step 3.Locate the gland diameter within the

O-ring number series in Table 7-10, page 50, to

5.Dynamic I.D./O.D. Seal, Rectangular Gland —determine the O-ring’s dash size.

Any pressure combination, page 69.

O-ring 设计规范与详细规格选用

If the exact gland dimensions cannot be located

in these tables, a nonstandard O-ring may be

required. Contact Greene, Tweed Engineering.

To choose both the appropriate gland dimensions and the

corresponding O-ring dash number:Record the dash number. Note: Not all standard O-ring cross-sections are available for all diameters.If the desired gland I.D. cannot be found withinthe dash size series that has been selected, adifferent cross-section must be selected.

Table 7-3: Standard Rectangular Face Sealing

Gland Cross-Sectional Dimensions

Step 1.From Table 7-3, page 46, select the desiredO-ring cross-section and its corresponding AS568A O-ring series. The cross-section selectionshould be based on the desired sealing footprintand allowable clearances within the hardware. A

larger cross-section will result in a wider sealing

footprint for a given cross-section squeeze

percentage and should be generally preferred.

However, larger cross-section seals will require a

greater compressive load (see Semiconductor Seal

Compound Selection Guide, pages 21–26).

Step 2.From Table 7-10, page 50, based on

hardware requirements, select the closest standard

gland I.D. within the O-ring dash size series. Dimensions in inches.

Figure 7-2 Select Gland I.D. from Table 7-10, Column “D”

O-ring 设计规范与详细规格选用

Figure 7-5 Select Gland O.D. from Table 7-10, Column “E”

Step 3.From Table 7-3, page 46, select theIf the O-Ring Dash Size Is Known

appropriate gland cross-section dimensions. To

calculate the gland O.D., add 2X the gland widthStep 1.Locate the dash number in Table 7-10, pageto the gland I.D. determined in step 2.50, to determine the O-ring’s dimensions from

columns “B” and “C.”

Static Face Seal, Rectangular Gland Internal Pressure/External VacuumStep 2.Select the corresponding gland O.D. from

column “E.”

Step 3.Determine the appropriate gland cross-

section dimensions, see Table 7-6, page 48.Step 4.To calculate the gland I.D., subtract 2X thegland width from the gland O.D. Figure 7-4

O-ring 设计规范与详细规格选用

Selecting the O-Ring Dash Size

If the O-ring dash size is not known and all gland

dimensions are known:

Step 1.Locate the dimensions of the gland’s cross-

section in Table 7-6, page 48.

Step 2.Select the corresponding O-ring dash

size series that matches the gland’s cross-

section dimensions.

Step 3.Locate the gland diameter within the

O-ring number series in Table 7-10, page 50,

to determine the O-ring’s dash size.

If the exact gland dimensions cannot be located in

these tables, a nonstandard O-ring may be

required. Contact Greene, Tweed Engineering.

Step 2.From Table 7-10, page 50, based onhardware requirements, select the closest standardgland O.D. within the O-ring dash size series.Record the dash number. Note: Not all standard O-ring cross-sections are available for all diameters.If the desired gland O.D. cannot be found withinthe dash size series that has been selected, adifferent cross-section must be selected.Step 3.From Table 7-6, page 48, select theappropriate gland cross-section dimensions. Tocalculate the gland I.D., subtract 2X the glandwidth from the gland O.D. determined in step 2.Static Face Seal, Dovetail GlandAny Pressure CombinationFigure 7-7

Note: The O-ring dash size is the same, whetheryou are specifying an O-ring or a Dovetail®Seal.

Dimensions in inches.If the O-Ring Dash Size Is Known

Step 1.Locate the dash number in Table 7-10, page

50, to determine the O-ring’s dimensions from

columns “B” and “C.”

Step 2.Select the corresponding gland centerline

diameter from column “F.”

Step 3.Determine the appropriate gland cross-section dimensions, see Table 7-9, page 49. To choose both the appropriate gland dimensions and thecorresponding O-ring dash number:Step 1.From Table 7-6, page 48, select the desired O-ring cross-section and its corresponding AS 568A O-ring series. The cross-section selectionshould be based on the desired sealing footprint and allowable clearances within the hardware. A larger cross-section will result in a wider sealingfootprint for a given cross-section squeeze

percentage and should be generally preferred.

However, larger cross-section seals will require a

greater compressive load (see Semiconductor Seal

Compound Selection Guide, pages 21–26).

O-ring 设计规范与详细规格选用

Figure 7-8Select Gland Centerline Diameter from Table 7-10, Column “F” for All Dovetail Glands

Selecting the O-Ring Dash Size Table 7-9: Standard Dovetail Face Sealing GlandIf the O-ring dash size is not known and all glandCross-Sectional Dimensions

dimensions are known:

Step 1.Locate the dimensions of the gland’s cross-section in Table 7-9, page 49. Step 2.Select the corresponding O-ring dash size series that matches the gland’s cross-section dimensions. Step 3.Locate the gland’s centerline diameterwithin the O-ring number series in Table 7-10,page 50, to determine the O-ring’s dash size.Dimensions in inches.

If the exact gland dimensions cannot be located

in these tables, a nonstandard O-ring may berequired. Contact Greene, Tweed Engineering.

O-ring 设计规范与详细规格选用

To choose both the appropriate gland dimensions and the

corresponding O-ring dash number:

Step 1.From Table 7-9, page 49, select the desired

O-ring cross-section and its corresponding AS

568A O-ring series. The cross-section selection

should be based on the desired sealing footprint

and allowable clearances within the hardware. A

larger cross-section will result in a wider sealing

footprint for a given cross-section squeeze

percentage and should be generally preferred.

However, larger cross-section seals will require a

greater compressive load (see Semiconductor Seal

Compound Selection Guide, pages 21–26).Step 2.From Table 7-10, page 50, based onhardware requirements, select the closest centerlinediameter within the O-ring dash size series fromcolumn “F.” Record the dash number. Note: Notall standard O-ring cross-sections are available forall diameters. If the desired centerline diametercannot be found within the dash size series that has been selected, a different cross-sectionmust be selected.Step 3.From Table 7-9, page 49, select theappropriate gland cross-section dimensions.

Table 7-10: Standard Face Sealing Diametrical Dimensions

Dimensions in inches.

O-ring 设计规范与详细规格选用

Table 7-10: Standard Face Sealing Diametrical Dimensions (continued)

Dimensions in inches.

Dimensions in inches.

O-ring 设计规范与详细规格选用

Table 7-10: Standard Face Sealing Diametrical Dimensions (continued)

Dimensions in inches.

O-ring 设计规范与详细规格选用

Table 7-10: Standard Face Sealing Diametrical Dimensions (continued)

Dimensions in inches.

Dimensions in inches.

O-ring 设计规范与详细规格选用

Table 7-10: Standard Face Sealing Diametrical Dimensions (continued)

Dimensions in inches.

O-ring 设计规范与详细规格选用

Table 7-10: Standard Face Sealing Diametrical Dimensions (continued)

Dimensions in inches.

O-ring 设计规范与详细规格选用

Table 7-10: Standard Face Sealing Diametrical Dimensions (continued)

Dimensions in inches.

O-ring 设计规范与详细规格选用

Table 7-10: Standard Face Sealing Diametrical Dimensions (continued)

Dimensions in inches.

Dimensions in inches.

O-ring 设计规范与详细规格选用

Table 7-10: Standard Face Sealing Diametrical Dimensions (continued)

Dimensions in inches.

O-ring 设计规范与详细规格选用

Table 7-10: Standard Face Sealing Diametrical Dimensions (continued)

Dimensions in inches.

Static I.D./O.D. Seal, Rectangular GlandSelecting the O-Ring Dash Size

Any Pressure CombinationIf the O-ring dash size is not known and all gland

dimensions are known:

Step 1.Locate the gland’s width in

Table 7-13, page 60.

Step 2.Select the corresponding O-ring dash size

series that matches the gland’s width.

Step 3.Locate the gland’s dimensions within the

O-ring number series in Table 7-14, page 61, to

Figure 7-11determine the O-ring’s dash size.

If the exact gland dimensions cannot be located in

If the O-Ring Dash Size Is Knownthese tables, a nonstandard O-ring may be

required. Contact Greene, Tweed Engineering.

Step 1.

Locate the dash number in Table 7-14, page

61, to determine the O-ring’s dimensions fromTo choose both the appropriate gland dimensions and thecolumns “B” and “C.”corresponding O-ring dash number:

Step 2.Locate the appropriate gland dimensionsStep 1.From Table 7-13, page 60, select the desiredin Table 7–14.O-ring cross-section and its corresponding AS

568A O-ring series. The cross-section selection

should be based on the desired sealing footprint

and allowable clearances within the hardware. A

larger cross-section will result in a wider sealing

footprint for a given cross-section squeeze

O-ring 设计规范与详细规格选用

percentage and should be generally preferred.

However, larger cross-section seals will require a

greater compressive load (see Semiconductor Seal

Compound Selection Guide, pages 21–26).

Step 2.From Table 7-14, page 61, based on

hardware requirements for O.D. sealing, select

the closest standard bore diameter, from column

“E,” within the O-ring dash size series. For I.D.

sealing, select the closest standard tube diameter

from column “G.” Record the dash number.

Note: Not all standard O-ring cross-sections are

available for all diameters. If the desired gland

diameter cannot be found within the dash size

series that has been selected, a different cross-

section must be selected.

Step 3.With the dash number determined in

Step 2, follow the instructions on page 59 todetermine complete gland dimensions.

Dimensions in inches.

Figure 7-12 Static I.D./O.D. Sealing Details

O-ring 设计规范与详细规格选用

Table 7-14: Standard Static I.D./O.D. Seal Diametrical Dimensions

O-ring 设计规范与详细规格选用

Table 7-14: Standard Static I.D./O.D. Seal Diametrical Dimensions (continued)

Dimensions in inches.

O-ring 设计规范与详细规格选用

Table 7-14: Standard Static I.D./O.D. Seal Diametrical Dimensions (continued)

Dimensions in inches.

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