Table of Contents
How deep should a groove be for an O-ring?
Cross Section & Groove Design Data
| Available Cross Sections for Encapsulated O-Rings & Groove Design Data | ||
|---|---|---|
| Inch | MM | Groove Depth |
| .063±.004 | 1.60±0.10 | .046 |
| .070±.004 | 1.78±0.10 | .049 |
| .079±.004 | 2.00±0.10 | .057 |
How do you calculate O-ring groove size?
Groove O-Ring Design: Seals for Static and Non-Rotary Dynamic Applications
- Calculate the O-Ring groove dimensions. Using the table above, determine the maximum recommended gland depth for your application.
- a. For a rod (shaft) seal:O-Ring Max Groove Diameter = Min Shaft Diameter + (2 x Recommended Gland Depth)
- b.
- c.
How far should an O-ring protrude?
To provide an effective seal, the O-ring’s inside diameter (I.D.) must be smaller than the piston groove diameter, so that the O-ring is slightly stretched, fitting snugly in the groove. This stretch should be between 1%-5% with 2% as the ideal in most applications. A stretch greater than 5% is not recommended.
How do you calculate groove depth?
Measure the depth of the groove by measuring the smallest diameter in the center of the groove. Subtract the measurement from the tube OD and divide by 2 to get the groove depth. Use the groove width and depth measurements to identify which size O-ring belt will fit the groove.
What should be the total angle of the groove?
The optimum groove angle is found to be 20 degrees (Figure 5.11), but it can vary between 17 and 23 degrees, (±15%), reducing pressure by less than 1.5%.
How do you calculate sealing pressure?
PV is given by the product of pressure of the media (in psi) and velocity of the shaft (in feet per minute). In this case, PV = 2 * (3/12) * 100 * 500 = 25,000 psi-ft./min. For this example, PV = (4/12) * 1000 * 50 = 52,360 psi-ft./min.
How much smaller Should an O-ring be?
What are standard O-ring sizes?
The standard sizes are also used for most military specifications. Cross-sectional diameters range from 0.040 to 0.275 inch. Inside diameters range from 0.029 to 25.940 inches.
What is groove angle?
The included angle between the groove faces of a weld groove.
How much space should be between the top of the ring groove and the side of the ring?
Start with the minimum of 0.001-inch and work up. Don’t measure between the ring and the bottom of the ring groove as you might damage the sealing surface.
What is ring groove?
A ring groove is a closely dimensioned groove cut into the face of a pipe flange. Together with a gasket, a groove helps create a seal between parts, so it is important that a groove meets designated specifications. API 6A ring grooves are divided into three ring types, BX, R, and RX.
What is a PV limit?
Pressure velocity, or PV value, is the combination of the pressure of the application and the speed of either the rotating or reciprocating shaft. The PV limit is the maximum value of that combination where the seal will function and wear normally.
What is O-ring groove design?
Designing the parts of an application where o-rings will be applied is broadly termed “o-ring groove design”. In order to seal properly, the o-ring has to deform in the application by being compressed and stretched in any number of ways. The design of the groove where the o-ring sits plays a major role in how the o-ring performs its sealing role.
What is the fourth table for O-ring groove design?
Lastly, the fourth table is for dovetail groove design. These o-ring groove design guides offer default dimensional guidance for basic o-ring groove design applications. Flange/Face Seal A flange or face sealis static and will not have a gap between surfaces, eliminating any design issues associated with extrusion.
What is a dovetail groove on an O ring?
DOVETAIL O-RING GROOVE DESIGN Dovetail grooves are used to hold the O-ring in-place on a face seal groove during during assembly and maintenance of equipment. An undercut or dovetail groove has proven beneficial in many applications to keep the o-ring in place.
What is as568b O-ring groove design?
STANDARD AS568B O-RING GROOVE DESIGN The three main types of standard groove designs are Industrial Static, also called Radial, Industrial Reciprocating, also called Dynamic, and Face Seals also called Axial or Flange. Radial and Dynamic seals require the presence of a diametrical clearance gap for installation.