Page 36 - HydraulicSealsCatalog

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34
Formula For Calculating Rod Wear Ring
Grooves
1. (C) Min. Groove Dia. = (A) Max. Rod Dia. +2
(Max. Wear Ring C/S). (C) Tolerance = + .003/- .000
2. (B) Min. Throat Dia. = [(C - 2 (Min. Wear Ring
CS)] + 2 (Min. Radial Clearance of .005). (B)
Tolerance = + .003/- .000
3. (D) Groove Length = Actual Part Height + .010 (D)
Tolerance = + .010/- .000
Notes:
1. Rod throat diameter (B) is a new diameter over and
above the diameter which is normally called out for
the rod seal. Additional diametral clearance is
required as noted for the wear ring to function
properly. Since a larger clearance gap results,
consideration as to the rod seal compounds must
be made to avoid rod seal extrusion.
2. Also consider wear ring groove design for small
diameter sizes. Installation problems on small sizes
will occur if the groove design is not compensated.
Wear Ring Dimensions
Rod Installation Groove Data
(inches)
(inches)
Part
Inside
Width
Cross
Rod
Throat
Groove
Groove
Number
Diameter
Section
Diameter
Diameter
Diameter
Length
+.003
+.003
+.010
-.000
-.000
-.000
A
B
C
D
**
5/8
1/4
1/8
5/8
0.648
0.875
0.260
**
3/4
1/4
1/8
3/4
0.773
1.000
0.260
**
3/4
3/8
1/8
3/4
0.773
1.000
0.385
WR21000500
3/4
1/2
1/8
3/4
0.773
1.000
0.510
**
13/16
3/8
1/8
13/16
0.810
1.037
0.385
**
7/8
3/8
1/8
7/8
0.898
1.125
0.385
**
7/8
1/2
1/8
7/8
0.898
1.125
0.510
**
1
1/4
1/8
1
1.023
1.250
0.260
WR21250375
1
3/8
1/8
1
1.023
1.250
0.385
WR21250500
1
1/2
1/8
1
1.023
1.250
0.510
** Not currently an American Packing stock item. Call for availability.