Parker O-Ring Handbook.pdf

5.31.3 O-Ring Glands for Pneumatic Floating
Piston Ring Seals
Design Chart 5-3 provides the basis for calculating gland
dimensions. For standard O-ring sizes, these dimensions
have been calculated and are listed in Design Table 5-3. The
procedures for the use of Design Table 5-3 are outlined in
Design Guide 5-3.
Guide for Design Table 5-3
If Desired Dimensionis
Known for
Dimension
in Column
Bore Dia of cylinder A
OD of piston C
Design Guide 5-3: Guide For Design Table 5-3
B-1 Piston Groove O.D.
(B-1 Max. = A Min. – 2 L Min.)
C Piston O.D.
1/2 E
A Cylinder Bore Dia.
[A Min. = (O-Ring Mean O.D.) — P]
Refer to Design Chart 5-3 (below) and
Design Table 5-3 for dimensions.
Floating Pneumatic Piston Ring Seal Glands
O-Ring
Size (a)
Parker
No. 2-
006
through
012
104
through
116
201
through
222
309
through
349
425
through
460
W
Cross Section
Nominal Actual
1/16
3/32
1/8
3/16
1/4
Parker O-Ring Handbook
After selecting gland dimensions, read horizontally to determine
proper O-ring size number. Specify compound.
Refer to 8-2, Military Fluid Specifi cation Description, Fluid
Compatibility Tables, or Table 3-1 to select the proper compound.
The effective part number for an O-ring consists of
both a size number and a compound number.
Rod Seal Gland Use Data in Chart 5-2 and
Table 5-2 for Industrial Reciprocating Seals.
Floating O-ring Design Does Not Apply to
Rod Seals.
0° to 5° Typ.
Break Edges
(0° Preferred)
Approx. .005 Rad.
1/2 E
16
32
R
32 32
Select Closest
Read to Determine
Horizontally in Column
Dimension for
B-1 Groove Dia of piston
C OD of piston
G Groove width
A Bore Dia of cylinder
B-1 Groove Dia of piston
G Groove width
Floating Pneumatic Piston Ring Seal Glands 13.8 Bar (200 psi) Max.
.070
±.003
.103
± .003
.139
± .004
.210
± .005
.275
± .006
P (c)
Peripheral
Squeeze
(Variable)
.035
to
.042
.038
to
.062
.061
to
.082
.084
to
.124
.140
to
.175
(a) Only sizes listed are recommended for this design.
(b) Total indicator reading between groove and adjacent bearing surface.
(c) Use to calculate A min diameter.
F L
Gland
Depth
G
F Groove
Depth (Ref.)
Gland Detail
Finishes are RMS values
L
Gland
Depth
.072
to
.076
.105
to
.109
.143
to
.147
.214
to
.218
.282
to
.286
G
Groove
Width
.075
to
.079
.111
to
.115
.151
to
.155
.229
to
.233
.301
to
.305
Design Chart 5-3: Design Chart for Floating Pneumatic Piston Ring Seal Glands
W
W
I.D.
E
Diametral
Clearance
.002
to
.010
.002
to
.010
.003
to
.011
.003
to
.011
.004
to
.012
W
Eccentricity
Max. (b)
.002
.002
.003
.004
.005
.003 Typ.
Section W-W
.005
Typ.
W
R
Groove
Radius
.005
to
.015
.005
to
.015
.010
to
.025
.020
to
.035
.020
to
.035
Parker Hannifi n Corporation • O-Ring Division
2360 Palumbo Drive, Lexington, KY 40509
Phone: (859) 269-2351 Fax: (859) 335-5128
www.parkerorings.com
Dynamic O-Ring Sealing
5-35