O-ring Slot
Created Date: 1/13/2020 9:08:49 AM.
Our o-ring groove design guides list default o-ring groove dimensions for the most basic applications and are intended to be used with the following o-ring groove design considerations to engineer on o-ring gland to optimize specific application performance. The wrong size groove makes even the best o-ring underperform.
O Ring Groove Dimensions Metric
O-ring Groove Calculator In Excel
O-Ring Squeeze Compression
- General rule is 0-5%
- % cross section reduction due to stretch about half of the % ID stretch
- Excessive clearance and or pressure can result in sealextrusion and failure
- Consider use of Back-Ups or product selection with large gaps or > pressure
- Tolerances should be considered for the O-Ring and the gland
- O-Ring Gland Surface Finish
- Static surfaces
-16Ra to seal gas
- Dynamic Surfaces: 8 to 16Ra
- Lower durometer materials can be used to seal rough surface finishes
- Corners should be chamfered to limit damage during seal installation
- Gland volume vs. O-Ring volume
- About 25% void space or 75% nominal fill
- Narrower groove for sealing vacuum or gas
- O-Ring Eccentricity & Side Loading
- Can open too wide a clearance gap and result in extrusion of one portion of seal leading to leaks
High Pressure Extrusion
Most o-rings are designed to operate at pressures up to 1,500 psi. At higher pressures, the material must have enough strength to resist extruding into the clearance gap. The chart shows the recommended combined limits of clearance, gap, material hardness and system pressure differential. To avoid extrusion at high temperature, reduce the extrusion gap, increase the seal material hardness or add a back-up ring to the o-ring but will require a wider gland.
O Ring Dovetail Slot
Cycling pressure can cause the o-ring to move back and forth within the gland. This motion can damage seals with low abrasion resistant materials. A higher durometer or an abrasion resistant material is recommended for these applications.
Rivers Casino Blackjack Rules