Piston Seals

Technical details Metric Inch

Operating conditions
Maximum Speed 0.5 m/sec 1.5 ft/sec
Temperature Range -30°C +100°C -22°F +212°F
Maximum Pressure 400 bar 6,000 p.s.i.

Maximum extrusion gap Figures show the maximum permissible gap all on one
side using minimum clearance Ø and maximum bore Ø.

83
Pressure bar 160 250 400
Pressure p.s.i. 2400 3750 6000
Maximum Gap in 0.024 0.020 0.016

Surface roughness µmRa µmRt µinCLA µinRMS

Dynamic Sealing Face ØD1 0.1 < > 0.4 4 max 4 < > 16 5 < > 18
Static Sealing Face Ød1 Ød2 1.6 max 10 max 63 max 70 max
Static Housing Faces Ød3 L1 L2 3.2 max 16 max 125 max 140 max

Chamfers & Radii

Groove Section ≤ S in 0.187 0.250 0.375
Min Chamfer C in 0.156 0.187 0.250
Max Fillet Rad r1 in 0.010 0.016 0.016
Max Fillet Rad r2 in 0.010 0.016 0.016

Tolerances ØD1 Ød1 Ød3 L1 L2

in H10 h10 ±0.005 +0.005-0 +0.004 -0
Ød2 in ≥ 1.5 2.5 3.5
-0.001 -0.003 -0.001 -0.004 -0.001 -0.005
L1 C

L1 C Design
20° 30° The Hallite 83 Tri-Seal assembly offers the
engineer many advantages when considering
r1 S
20° 30° the design of cast iron,bronze,alloy etc.one-
piece pistons in double-acting hydraulic
r1 S cylinders, not the least being cost effectiveness
with long and efficient seal life.
Ød1 ØD1
The Tri-Seal consists of two split plastic anti-
extrusion rings and a nitrile synthetic rubber
Ød1 ØD1 sealing member. Under pressure, the seal
exerts a wedging action on the anti-extrusion
ring, reducing the clearance between the
cylinder bore and the piston, thus minimising
the possibility of extrusion of the seal.
Wear rings are also available for this
assembly, allowing the designer to benefit from
L2 L1 L2 C the following advantages :
•Eliminate metal to metal contact in the bore
L2 L1 L2 C •One piece steel piston
20° 30° •Improved alignment for optimum seal life
r2 •Smoother operation
r1 S
20° 30° Note : For availability of sizes not listed please
r2 consult your local Hallite sales department.
r1 S
When ordering Hallite 83 with wear rings please
Ød3 Ød2 Ød1 ØD1 replace the last digit of the part number as
indicated:
Ød3 Ød2 Ød1 ØD1 Without wear rings
Last digit of part no. _ _ _ _ _ _ 0
With wear rings
Last digit of part no. _ _ _ _ _ _ 9

131
L 2 L 1 L2

L 2 L 1 L2

L1
 r1 S

Ød3 Ød2 Ød1 ØD1

Piston Seals inch

83
L 2 L 1 L2

L1

Ød3 Ød2 Ød1 ØD1

Ød1 ØD1

ØD1 TOL Ød1 TOL Ød2 TOL Ød3 L1 L2 PART No.

H10 h10 ±0.005 + 0.005 - 0 + 0.004 - 0

1.500 +0.004 1.125 +0.000 1.321 -0.001 1.450 0.452 0.250 611191_
+0.000 -0.004 -0.003
2.000 +0.005 1.500 +0.000 1.821 -0.001 1.950 0.587 0.250 232631_
+0.000 -0.004 -0.003
2.500 +0.005 2.000 +0.000 2.321 -0.001 2.450 0.587 0.250 212201_
+0.000 -0.005 -0.004
3.000 +0.005 2.500 +0.000 2.774 -0.001 2.940 0.587 0.250 212211_
+0.000 -0.004 -0.004
3.250 +0.005 2.750 +0.000 3.023 -0.001 3.190 0.587 0.250 232761_
+0.000 -0.005 -0.004
3.500 +0.005 3.000 +0.000 3.274 -0.001 3.440 0.587 0.250 212221_
+0.000 -0.005 -0.005
4.000 +0.005 3.250 +0.000 3.773 -0.001 3.940 0.780 0.250 232641_
+0.000 -0.005 -0.005
4.500 +0.005 3.750 +0.000 4.232 -0.001 4.440 0.780 0.250 236041_
+0.000 -0.005 -0.005
5.000 +0.006 4.250 +0.000 4.713 -0.001 4.910 0.780 0.375 232651_
+0.000 -0.005 -0.005
6.000 +0.006 5.250 +0.000 5.713 -0.001 5.910 0.780 0.375 232661_
+0.000 -0.006 -0.005
7.000 +0.006 6.250 +0.000 0.780 2361910
+0.000 -0.006
8.000 +0.007 7.250 +0.000 0.780 2361710
+0.000 -0.007

132