T HE R IGHT S EAL
芦荟排毒胶囊R ELEASE3.0 Y OUR G UIDE TO S EALING IN S EMICONDUCTOR P ROCESSING
The proper design of an O-ring gland is a critical step in attaining optimum al performance.
This chapter provides the information necessary to lect the recommended O-ring gland dimensions for a specific type of application, and to lect 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.)
The gland dimension recommendations prented in the tables of this chapter reprent a significant amount of work done by SAE. The dimensions, when ud in conjunction with standard AS 568A dash number O-rings, virtually assure satisfactory aling functionality. A al extraction groove is recommended whenever possible. This reduces the chance of damage to the gland when removing and replacing the al.
To determine recommended gland dimensions, standard O-ring sizes and AS 568A dash numbers, the designer should first lect the intended aling application from the following list and refer to the indicated page and tables.王尔德
1.Static Face Seal, Rectangular Gland — Internal vacuum/external pressure, page 45.
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2.Static Face Seal, Rectangular Gland — Internal pressure/external vacuum, page 47.
3.Static Face Seal, Dovetail Gland — Any pressure combination, page 48.
4.Static I.D./O.D. Seal, Rectangular Gland — Any pressure combination, page 59.
5.Dynamic I.D./O.D. Seal, Rectangular Gland —Any pressure combination, page 69.
If the O-Ring Dash Size Is Known
Step 1.Locate the dash number in Table 7-10,
beginning on page 50, to determine the O-ring’s
dimensions from columns “B” and “C.”
Step 2.Select the corresponding gland I.D. from
column “D.”
Step 3.Determine the appropriate gland cross-
茶叶的保质期一般是多久ction dimensions, e Table 7-3, page 46.
Step 4.To calculate the gland O.D., add 2X the
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gland width to the gland I.D.
士兵英语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-ction in Table 7-3, page 46.
Step 2.Select the corresponding O-ring dash size
ries that matches the gland’s cross-ction
dimensions.
Step 3.Locate the gland diameter within the
O-ring number ries in Table 7-10, page 50, to
determine the O-ring’s dash size.
7Chapter
SEAL GLAND DESIGN
图书馆建设方案Static Face Seal, Rectangular Gland
Internal Vacuum/External Pressure七里香简谱
Figure 7-1
If the exact gland dimensions cannot be located in the tables, a nonstandard O-ring may be required. Contact Greene, Tweed Engineering.
To choo both the appropriate gland dimensions and the corresponding O-ring dash number:
Step 1.From Table 7-3, page 46, lect the desired O-ring cross-ction and its corresponding AS 568A O-ring ries. The cross-ction lection should be bad on the desired aling footprint and
allowable clearances within the hardware. A larger cross-ction will result in a wider aling footprint for a given cross-ction squeeze percentage and should be generally preferred. However, larger cross-ction als will require a greater compressive load (e Semiconductor Seal Compound Selection Guide, pages 21–26).
Step 2.From Table 7-10, page 50, bad on hardware requirements, lect the clost standard gland I.D. within the O-ring dash size ries. Record the dash number. Note: Not all standard O-ring cross-ctions are available for all diameters. If the desired gland I.D. cannot be found within the dash size ries that has been lected, a different cross-ction must be lected.
Figure 7-2 Select Gland I.D. from Table 7-10, Column “D”
Table 7-3: Standard Rectangular Face Sealing Gland Cross-Sectional Dimensions
Dimensions in inches.
Step 3.From Table 7-3, page 46, lect the appropriate gland cross-ction dimensions. To
calculate the gland O.D., add 2X the gland width to the gland I.D. determined in step 2.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 O.D. from
column “E.”
Step 3.Determine the appropriate gland cross-
ction dimensions, e Table 7-6, page 48.Step 4.To calculate the gland I.D., subtract 2X the gland width from the gland O.D. Figure 7-5 Select Gland O.D. from Table 7-10, Column “E”
Figure 7-4
Static Face Seal, Rectangular Gland Internal Pressure/External Vacuum
