Parker Prädifa Rod Seals BU

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The Parker PrädifaBU Ultrathan®  rod seal is a compact seal with an integrated anti-extrusion ring. It is frequently used as a buffer seal within sealing systems such as those utilized in construction machine cylinders. Construction machine cylinders operate in harsh conditions in which pressure peaks of up to 1000 bar frequently occur. The BU rod seal is installed upstream to isolate such loads from the secondary seal. Due to its special shape, the seal (like a return valve) is able to return pressure that may build up between the primary and the secondary seal into the system. A single or tandem arrangement of this product series is possible as well.

  • Enhanced sealing performance in non-pressurized
  • Robust seal profile for harshest operating conditions.
  • Extreme wear
  • Insensitive to extreme pressure
  • Extremely high extrusion resistance.
  • Excellent media resistance in case of suitable compound
  • Suitable compounds available for special requirements of the chemical process industry.
  • Suitable compounds available for special requirements of the food processing
  • Dimensions according to ISO
  • Dimensions according to ISO 7425-2.
  • Short axial assembly
  • Installation in closed and undercut
  • Additional sizes of machined products available on short

Range of application

Mainly used for sealing cylinders in mobile hydraulics.

Operating pressure                                          ≤ 500 bar

Pressure peaks                                             ≤ 1000 bar

Operating temperature                                    -35 °C to +110 °C

Sliding speed                                                    ≤ 0.5 m/s

Media                                                                  Hydraulic oils based on mineral oil

Compounds

The compound Ultrathan® P5008 is a Parker Praedifa material based on polyurethane with a Shore A hardness of approx. 93.

Back-up ring compound:  W5019

Installation

The seals should have an axial clearance (see columns H and L). To avoid damage at the sealing lips, the seals should not be pulled over sharp edges during installation. Normally these seals may be snapped into closed grooves. Where access is restricted special assembly tools may be required. Proposals for the design of such tools will be provided on request. For gap sizes see chapter “Maximum Gap Allowance”.

d D H L d1 ISO1) ISO2) Order code
55 70 8.5 9.5 55.5 BU005500060
56 71 8.5 9.5 56.5 BU005600600
60 75 8.5 9.5 60.5 BU006000600
60 75.1 6.1 6.3 60.5 BU006100656
63 78.1 6.1 6.3 63.4 BU006300656
65 80 8.5 9.5 65.4 BU006500600
65 80.5 6.1 6.3 65.4 BU006600656
70 85 8.5 9.5 70.5 BU007000600
70 85.1 6.1 6.3 70.5 BU007100656
75 90 8.5 9.5 75.5 BU007500600
80 95 8.5 9.5 80.5 BU008000600
80 95.1 6.1 6.3 80.5 BU008400656
80 95.5 6.1 6.3 80.4 BU008200656
85 100.5 6.1 6.3 85.4 BU008500656
90 105 8.5 9.5 90.5 BU009000600
90 105.5 6.1 6.3 90.4 BU009100656
95 110.5 6.1 6.3 95.4 BU009400656
100 115.5 6.1 6.3 100.4 BU010400656
100 120 11.4 12.5 100.6 BU010000600
110 125.5 6.1 6.3 110.4 BU011800656
110 130 11.4 12.5 110.6 BU011000600
120 140 11.4 12.5 120.6 BU012000600
130 150 14.5 16 130.6 BU013000600
140 160 14.5 16 140.6 BU014000600
150 170 14.5 16 150.6 BU015000600
160 180 14.5 16 160.6 BU016000600
170 190 10.3 11 170.6 BU017000656
180 205 14.5 16 180.8 BU018000600
200 225 14.5 16 200.8 BU020000600
220 250 18.2 20 220.8 BU022000600
250 280 18.2 20 250.8 BU025000600
280 310 18.2 20 280.8 BU028000657

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