Back-up ring Prädifa series XA, Polon® | Parker NA
687424
687424

Back-up ring Prädifa series XA, Polon®

Plain PTFE back-up ring to prevent extrusion.

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Product Overview
Description
    The XA Polon® anti-extrusion ring (single turn continuous version) is used in combination with O-rings, preferably in static applications, to prevent gap extrusion. XA anti-extrusion rings are suitable for maximum pressure loads. They are intended for installation in axially open grooves.

    Polon® anti-extrusion rings are available in three versions:
    XA: Single turn continuous
    XB: Single turn scarf cut
    XC: Spiral cut

    • Insensitive to pressure peaks.
    • High extrusion resistance.
    • Excellent media resistance in case of suitable compound selection.
    • Suitable compounds available for special requirements of the chemical process industry.
    • Suitable compounds available for special requirements of the food processing industry.
    • Any desired nominal diameter available due to use of machining technique.
    • Installation in closed and undercut housings.

    We recommend to specify back-up rings when at least one of the following working conditions is present in cases where the intention is to seal with O-Rings only:
    • Pressure above 70 bar.
    • Diametral clearance exceeding 0.25 mm at p > 10 bar.
    • High stroke frequency.
    • High temperatures.
    • Contaminated medium.
    • Strong pressure pulsing or pressure changes.
Tech Specifications
Description

Performance Characteristics

Media

Hydraulic

Polymer Material Options

Polytetrafluoroethylene (PTFE, mPTFE, TFM, Polon®)
Thermoplastic Polyurethane (TPU, Resilon®, Ultrathan®)
Polyether Ether Ketone (PEEK)

Maximum Operating Pressure

200 bar
400 bar
800 bar

Minimum Operating Temperature

-200 to -30 °C

Maximum Operating Temperature

80 to 230 °C

Maximum Surface Speed

0 m/sec
0.5 m/sec
1.0 m/sec

Unit of Measure

Length: mm

Cushioning Mechanism

No

Thermal Application Type

Expanded Low and High Temperature (< -35 to 140°C)

Pressure Rating

Medium Pressure (< 250 bar)

Product Support

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