Seals Flashcards
With pressure sealing, gaskets are usually subject to what?
Compression and Internal Pressure
What two types of O-rings are there?
Dynamic and Static
What are two main catagories of Dynamic Seals? Give examples for each.
- Contact: Packing, Lip, Diaphram, Mechanical Seals
- Clearance: Bushings, Annulus, Slinger, Labyrinth Seals
Are Dynamic Seals Positive or Non-Positive?
Can be either.
Is Packing Positive or Non-Positive Sealing?
Either
What is Inside and Outside Packed?
- Inside is packing installed in the moving unit.
- Outside is packing installed in the stationary unit. Ex..Stuffing box
What is Automatic Packing?
Name some examples.
- Sealing which uses system pressure to improve its sealing action.
- U-ring, V-ring, O-ring, Cup packing
Is Cup Packing Balanced or Unbalanced?
Unbalanced as it has one lip and seals only one diameter
A balanced seal is what?
A seal the seals on two diameters.
A Cup packing is usually found as a what?
Piston Seal
What is the purpose of a rod wiper?
Wipe off contaminants during the retract stroke.
A Lip Seal will only withstand a maximum pressure of about what?
5 PSIG
The width of standard O-ring grooves are usually machined out to what % of O-ring cross sectional diameter.
40% greater than the O-ring cross sectional diameter.
What type of Gasket is this?
Flat
What type of Gasket is this?
V - U-Shaped
What type of Gasket is this?
Spiral-wound
What type of Gasket is this?
Corrugated or Embossed
What type of Gasket is this?
Jacketed with filler material core
What type of Gasket is this?
Flexi-metallic has a metallic inner ring and non-metallic outer ring.
What is 1 miro-inch in microns?
1 micro-inch = 0.0254 microns
What is this?
Label it.
Lip Seal
What type of seal is this?
Lip Seal, Inclusion Position
What type of seal is this?
Lip Seal, Exclusion Position
What type of seal is this?
Double Lip Seal
