Rotary O-Ring Seal Glands
Rotary O-Ring Seal Glands
5.31.4 O-Ring Glands for Rotary Seals After selecting gland dimensions, read horizontally to
Design Chart 5-4 provides the basis for calculating gland determine proper O-ring size number. Specify compound.
dimensions. For standard O-ring sizes, these dimensions Refer to the discussion on rotary seals earlier in this chapter
have been calculated and are listed in Design Table 5-4. The for the selection of the proper compound The effective part
procedures for the use of Design Table 5-4 are outlined in number for an O-ring consists of both a size number and a
Pressure R Gland
32
F L
32
32 Depth
A-1 Dia. G
F Groove
1/2 E (A-1 Min. = B Max. + 2L Min.)
16 Max. Depth (Ref.)
Gland Detail
W
W .005
M Typ.
W W
B Dia. = O-ring I.D. + .002 I.D.
D Dia. .003 Typ.
(D Min. = B Max. + E Min.)
Section W-W
Note: Due to effect of centrifugal force, do not locate groove in shaft. Refer to Design Chart 5-4 (below) and Design
Table 5-4 for dimensions.
Rotary O-Ring Seal Glands, 55.2 Bar (800 psi) Max. (c)
(Below 200 FPM, Use Design Chart 5-2)
O-Ring M
Size W Maximum L G E (c) Bearing R
Parker Cross Section Speed Squeeze Gland Groove Diametral Eccentricity Length Groove
No. 2- Nominal Actual FPM (a) % Depth Width Clearance Max (b) Min. (c) Radius
004 200 0.065 0.075 0.012 0.005
0.070
through 1/16 to 0-11 to to to 0.002 0.700 to
±.003
045 1500 0.067 0.079 0.016 0.015
102 200 0.097 0.108 0.012 0.005
0.103
through 3/32 to 1-8 1/2 to to to 0.002 1.030 to
±.003
163 600 0.099 0.112 0.016 0.015
201 200 0.133 0.144 0.016 0.010
0.139
through 1/8 to 0-7 to to to 0.003 1.390 to
±.004
258 400 0.135 0.148 0.020 0.025
(a) Feet per minute = 0.26 X Shaft Diameter (inches) X rpm.
(b) Total indicator reading between groove OD, shaft, and adjacent bearing surface.
(c) If clearance (extrusion gap) must be reduced for higher pressures, bearing length M must be no less than the minimum figures given. Clearances given are
based on the use of 80 shore durometer minimum O-ring for 55.2 Bar (800 psi) max. See Figure 3-2 for recommended clearances when pressures exceed
55.2 Bar (800 psi).
Design Chart 5-4: Design Chart for Rotary O-Ring Seal Glands