INDUSTRY COMPONENT

Seal (O-ring/Gasket)

Elastomeric sealing component for relief valves that prevents fluid leakage between mating surfaces under pressure differentials.

Component Specifications

Definition
A precision-engineered elastomeric sealing element designed specifically for relief valve applications, creating a hermetic barrier between valve body and seat surfaces to prevent fluid or gas leakage during normal operation and pressure relief events. It maintains seal integrity across temperature fluctuations, chemical exposure, and mechanical cycling typical in industrial hydraulic and pneumatic systems.
Working Principle
Operates on compression sealing principle where controlled deformation of elastomeric material fills microscopic surface imperfections between mating metal surfaces. Under system pressure, the seal experiences radial expansion against sealing grooves, creating increasing contact pressure proportional to fluid pressure (self-energizing effect). During pressure relief cycles, the seal maintains sufficient compression to prevent blow-by while allowing controlled valve reseating.
Materials
Nitrile rubber (NBR) for petroleum-based fluids (temperature range: -40°C to 120°C), Fluorocarbon (FKM/Viton) for aggressive chemicals and high temperatures (up to 200°C), Ethylene Propylene Diene Monomer (EPDM) for steam and hot water applications, Silicone (VMQ) for food-grade and wide temperature applications (-60°C to 225°C). Material hardness: 70-90 Shore A durometer.
Technical Parameters
  • Compression Set <25% after 22h at 150°C
  • Pressure Rating Up to 1000 bar static, 350 bar dynamic
  • Temperature Range -60°C to +225°C (material dependent)
  • Inner Diameter Range 2mm to 500mm
  • Cross-Section Diameter 1.78mm to 8.38mm
  • Surface Finish Requirement Ra 0.4-0.8 μm mating surfaces
Standards
ISO 3601-1, AS 568A, DIN 3771, SAE J515

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Seal (O-ring/Gasket).

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Seal extrusion under high pressure
  • Chemical incompatibility with system media
  • Thermal degradation
  • Installation damage from sharp edges
  • Compression set leading to leakage
FMEA Triads
Trigger: Excessive gland clearance
Failure: Seal extrusion into gap during pressure spikes
Mitigation: Maintain gland design per ISO 3601-1 standards, maximum 0.15mm radial clearance
Trigger: Incorrect material selection
Failure: Chemical swelling or hardening
Mitigation: Perform fluid compatibility testing, select per ASTM D471 standards
Trigger: Improper installation
Failure: Twisting or cutting during assembly
Mitigation: Use installation cones, lubricate with compatible fluid, verify no sharp edges

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.10mm on cross-section, ±0.20mm on inner diameter per ISO 3601-1 Class A
Test Method
Pressure decay test per ISO 9978, helium leak test for critical applications, compression set test per ASTM D395

Buyer Feedback

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Frequently Asked Questions

What causes O-ring failure in relief valves?

Common failure modes include extrusion damage from excessive clearance gaps, compression set from over-tightening, chemical degradation from incompatible fluids, and thermal degradation from operating beyond material temperature limits.

How often should relief valve seals be replaced?

Preventive replacement every 12-24 months depending on service conditions. Immediate replacement required if visual inspection reveals cracks, flattening, swelling, or if the valve fails pressure testing.

Can different elastomer materials be mixed in valve assemblies?

No. Different elastomers have varying compression characteristics and chemical resistance. Mixing materials can cause uneven sealing pressure and accelerated degradation.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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