PU Rod Buffer Seal Rings

PU Rod Buffer Seal Rings

Technical details

Operating conditions          Metric                    Inch

Maximum speed                1.0m/sec              3.0 ft/sec

Temperature range            -45℃+110℃        -50°F +230°F

Maximum pressure            700bar 10.000 p.s.i.*

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

Pressure bar                                                  160          250          400          500          700

Maximum Gap (S＜＝6)mm                   0.6            0.5           0.4           0.3           0.2

Maximum Gap (S＞6)mm                        1.0            0.8           0.6           0.4          0.25

Pressure p.s.i.                                               2400       3750         6000        7500     10.000

Maximum Gap (S＜＝0.250)in              0.024      0.020        0.016       0.012     0.008

Maximum Gap (S＞0.250)in                    0.040      0.032       0.024       0.016     0.010

Surface roughness                                      μmRa                μmRt       μinCLA         μinRMS

Dynamic sealing face ød₁                      0.1＜＞0.4      4 max        4＜＞16     5＜＞18

Static sealing face L₁                                1.6 max            10 max      63 max        70 max

Static housing faces ØD₁ L₁                   3.2 max            16 max      125 max    140 max

Chamfers & Radii

Groove section ≤ S mm        3.75      5.50      7.75      10.50

Min chamfer C mm                3.00      3.50       5.00       7.50

Max fillet Rad r₁mm              0.50      0.70       1.20       1.60

Groove section ≤ S in           0.150    0.215     0.306    0.413

Min chamfer C in                   0.125    0.140      0.200    0.300

Max fillet Rad r₁in                 0.020   0.028      0.047     0.062

Tolerances ød₁ øD₁ L₁

mm f9 H10 +0.25 -0

in f9 Js11 +0.010-0

The PU buffer seal rings which is manufactured in Kintowe R01, is designed to provide a valve action to prevent excessive pressure build up in the cavity between the buffer seal and the rod seal. A polyacetal/PFC anti-extrusion ring is fitted to provide maximum extrusion resistance against shock pressure loads.

Features

K660 PU buffer seals allow oils to reach the primary seal at low pressure preventing the primary seal from running dry.

It will self energized for maximum seal ability at high pressure or during shock load to protect the primary seal from it.

If there is ever pressure trap, it will release the trapped pressure at the lowest level when comparing to other buffers in the market.

Easy installation.

Long service life.

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