O-ring seals are widely used in various industrial and civilian fields due to their simple structure, reliable sealing performance, low cost, and strong adaptability. Here are their typical application scenarios and detailed explanations:
I. Hydraulic and Pneumatic Systems
Hydraulic Cylinder Sealing
Application scenarios: Hydraulic cylinder piston rods or pistons in construction machinery (such as excavators, cranes), industrial equipment (such as injection molding machines, die-casting machines).
Function: Prevent hydraulic oil leakage, withstand high pressure (typically 20-40 MPa) and dynamic reciprocating motion, and need to be combined with retaining rings to prevent extrusion.
Material selection: Nitrile rubber (NBR, oil-resistant), polyurethane (PU, wear-resistant).
Pneumatic Component Sealing
Application scenarios: Cylinders, pneumatic valves, pneumatic fixtures, etc.
Function: Prevent compressed air leakage, adapt to medium-low pressure (typically ≤ 1 MPa) and frequent start-stop conditions.
Material selection: Nitrile rubber (NBR, general-purpose), fluororubber (FKM, high-temperature resistant).
II. Automotive Industry
Engine System
Application scenarios: Valve cover gaskets, oil pan seals, front and rear oil seals of the crankshaft, etc.
Function: Prevent engine oil and coolant leakage, withstand high temperatures (150-200°C) and fuel corrosion.
Material selection: Fluororubber (FKM, high-temperature resistant), acrylate rubber (ACM, fuel-resistant).
Brake System
Application scenarios: Brake master cylinders, brake caliper seals.
Function: Prevent brake fluid leakage, ensure sensitive braking response, and need to pass DOT certification.
Material selection: Triblock ethylene propylene diene monomer rubber (EPDM, resistant to brake fluid), nitrile rubber (NBR, cost-effective solution).
Fuel System
Application scenarios: Fuel pumps, fuel pipe joint seals.
Function: Prevent fuel leakage, adapt to new fuels such as ethanol gasoline.
Material selection: Fluororubber (FKM, chemical corrosion resistant), nitrile rubber (NBR, general-purpose).
III. Aerospace
Aircraft Hydraulic System
Application scenarios: Landing gear retraction and extension mechanisms, flap actuator seals.
Function: Maintain sealing under extreme temperatures (-55°C to 150°C) and high pressures (35 MPa or more), and need to pass NAS1613 and other military standards certifications.
Material selection: Fluorosilicone rubber (FVMQ, low-temperature resistant), perfluoro rubber (FFKM, resistant to extreme chemical environments).
Engine Fuel Pipeline
Application scenarios: Fuel pump seals of turbofan engines.
Function: Prevent fuel leakage from causing fires, and need to pass FAA certification.
Material selection: Polyetheretherketone (PEEK, high-temperature and wear-resistant), fluororubber (FKM, fuel-resistant).
IV. Household Appliances Refrigeration equipment
Application scenarios: Refrigerator compressors, air conditioner condenser seals.
Function: Prevent refrigerant leakage (such as R600a, R410A), requires UL certification.
Material selection: Ethylene propylene diene monomer rubber (EPDM, resistant to refrigerants), hydrogenated nitrile rubber (HNBR, resistant to high temperatures).
Washing machines / Dishwashers
Application scenarios: Door seals, water pump seals.
Function: Prevent water leakage, suitable for frequent start-stop and detergent corrosion.
Material selection: Silicone rubber (VMQ, resistant to hydrolysis), chloroprene rubber (CR, resistant to oil).
VII. Medical Devices
Infusion equipment
Application scenarios: Infusion pumps, syringe piston seals.
Function: Prevent drug leakage, requires ISO 10993 biocompatibility certification.
Material selection: Medical-grade silicone rubber (VMQ, non-toxic), fluororubber (FKM, resistant to chemical disinfection). ventilator / respirator
Application scenarios: Gas pipeline valves, oxygen pipeline connection sealing.
Function: Prevent gas leakage and ensure patient safety.
Material selection: Ethylene propylene diene monomer (EPDM, resistant to ozone), nitrile butadiene rubber (NBR, low cost).
Six. New energy field
Lithium battery manufacturing
Application scenarios: Electrolyte injection port sealing, battery pack airtightness test.
Function: Prevent electrolyte leakage to avoid short circuits, need to pass IP67/IP68 protection level tests.
Material selection: Fluororubber (FKM, resistant to electrolyte), perfluoro rubber (FFKM, extreme environment).
Hydrogen fuel cell
Application scenarios: Bipolar plate flow channel sealing, hydrogen gas pipeline connection.
Function: Prevent hydrogen leakage, need to pass hydrogen compatibility tests (such as ISO 15136).
Material selection: Ethylene propylene diene monomer (EPM, resistant to hydrogen embrittlement), fluororubber (FKM, resistant to high pressure).
Seven. Special operating conditions applications
Vacuum system
Application scenarios: Semiconductor equipment, vacuum coating machine.
Function: Maintain high vacuum degree (≤10?? Pa), need low out-gassing rate materials.
Material selection: Perfluoro rubber (FFKM, extremely low permeability), silicone rubber (VMQ, resistant to baking).
Nuclear power field
Application scenarios: Nuclear reactor coolant pump sealing.
Function: Prevent radioactive coolant leakage, need to pass RCC-M and other nuclear grade standards.
Material selection: Silicon carbide (SiC, wear-resistant), fluororubber (FKM, radiation-resistant).
Eight. General industrial sealing
Pipeline flange connection
Application scenarios: Chemical, petroleum pipeline flange sealing.
Function: Replace traditional gaskets, simplify installation, adapt to medium and low pressure (≤10MPa).
Material selection: Nitrile butadiene rubber (NBR, resistant to oil), chloroprene rubber (CR, resistant to weathering).
Equipment inspection port
Application scenarios: Storage tank, reaction vessel manhole sealing.
Function: Quick disassembly and assembly, reduce maintenance costs.
Material selection: Ethylene propylene diene monomer (EPDM, general-purpose), silicone rubber (VMQ, resistant to high temperature).
Summary of design points
Material matching: Select corrosion-resistant materials according to the medium type (oil, water, gas, chemical reagents).
Pressure adaptation: For high-pressure scenarios, increase the cross-sectional diameter or use retaining rings, for low-pressure scenarios, reduce the compression ratio to lower friction.
Temperature control: High-temperature conditions require materials with a glass transition temperature (Tg) higher than the working temperature (such as fluororubber with Tg ≈ -20℃ to 250℃).
Dynamic sealing optimization: For reciprocating motion sealing, control surface roughness (Ra ≤ 0.8μm), for rotating sealing, reduce friction coefficient (μ ≤ 0.1).
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