What does a sealing ring do?

Breaking Down the Core Functions of Sealing Rings

1. Blocking Media Leakage

Static Seal: Presses tightly against fixed joints such as flanges and end caps, preventing lubricant and coolant from leaking through gaps (e.g., seams in reducer housings).
Dynamic Seal: Maintains a seal during the movement of rotating shafts or reciprocating piston rods, preventing hydraulic oil from spraying out (e.g., the boom cylinder of an excavator).

2. Protecting Against External Intrusion

Dust Fortress: In cement plant equipment, lip seals block particles larger than 0.1 mm, preventing bearings from seizing due to dust intrusion.
Liquid-Gas Isolation: Crankshaft oil seals in automotive engines prevent rainwater and mud from entering the crankcase, preventing oil emulsification and deterioration.

3. Maintaining System Pressure

High-Pressure Vessel Gatekeeper: Hydraulic system O-rings deform under pressure to fill the groove, withstanding pressures exceeding 30 MPa without bursting (e.g., the clamping unit of an injection molding machine).
Vacuum Guardian: Seals in semiconductor equipment isolate air from intrusion, maintaining a vacuum level of 10⁻³Pa.

4. Reduce Friction Damage

Lubrication Retainer: The spiral oil return groove of the skeleton oil seal pumps leaked grease back into the cavity, continuously lubricating the shaft journal (such as motor bearing seals).
Metal Isolation: Isolates the bearing from the metal-to-metal contact with the housing, preventing fretting corrosion (such as in wind turbine gearbox bearing seats).

5. Safety Barrier

Explosion-proof Barrier: Explosion-proof motor seals block electrical sparks from contacting external flammable gases (such as in chemical plant pumps).
Toxic Media Containment: Fluororubber seals in pickling equipment block concentrated sulfuric acid leaks, protecting operators.

6. Special Environment Adaptability

Extreme Temperature Buffer: Silicone rubber seals maintain elasticity in the temperature range of -50°C to 250°C (such as in aircraft engine accessories).
Radiation Barrier: Nuclear power plant valve seals contain boron-containing polyethylene to absorb neutron radiation and prevent leakage.