Flange Seal Praedifa Series OV, Ultrathan®

The OV flange seal made of polyurethane compounds was developed as an alternative to conventionally used O-ring/back-up ring combinations for static sealing at high pressures. The robust seal geometry and use of particularly extrusion-resistant Parker polyurethane compounds simplifies installation and enhances sealing performance in pulsating pressure conditions, resulting in significantly longer service life. The OV flange seal is particularly suitable for SAE flanges and inferior surface qualities of the flange components. Due to the interference fit, the geometric design of the flange seal prevents the otherwise frequent occurrence of O-ring “pumping.”

Leakage which has been observed when O-rings are used can be attributed to a pressure buildup on the outer diameter which occurs with pressure surges and pressure fluctuations, frequently causing O-rings to be pulled out of their seats and being carried off by the fluid flow. This profile and the recommended groove prevent this effect. A radial movement and the wear it entails, which may occur with O-rings, is avoided by the special shape of the OV seal.

• Enhanced sealing performance in non-pressurized conditions.

• 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.

• Installation in closed and undercut housings.

• Design is appropriate for use for overhead installation by tight fit on the outer diamater.

• Further dimensions of machined series with short lead times available.

• Trapped pressure at atmosphere side based on pressure peaks is prevented by the design of flangeseals.