INDUSTRY COMPONENT

Sealing Rings

Sealing rings are precision-engineered components that prevent fluid leakage and maintain pressure integrity in piston and diaphragm assemblies.

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Component Specifications

Definition
Sealing rings are annular components designed to create a hermetic seal between moving or static parts in hydraulic and pneumatic systems. In piston/diaphragm assemblies, they prevent fluid or gas leakage across pressure differentials while accommodating relative motion, thermal expansion, and wear. These rings function by elastic deformation against mating surfaces, maintaining contact through spring force or system pressure.
Working Principle
Sealing rings operate on the principle of controlled interference fit and elastic recovery. When installed in a gland or groove, the ring's cross-section deforms to fill the clearance gap. System pressure energizes the seal by forcing it against the mating surface (pressure-activated sealing). For dynamic applications, lubrication films reduce friction while maintaining sealing effectiveness through micro-surface contact.
Materials
Nitrile rubber (NBR) for general hydraulic fluids, Fluorocarbon (FKM/Viton) for high-temperature and chemical resistance, Ethylene Propylene Diene Monomer (EPDM) for steam and hot water, Polyurethane (PU) for high wear resistance, Polytetrafluoroethylene (PTFE) for chemical inertness and low friction. Hardness: 70-90 Shore A. Temperature range: -40°C to +200°C depending on material.
Technical Parameters
  • Clearance gap 0.05-0.15 mm depending on pressure
  • Cross-section 1.5mm to 6mm
  • Diameter range 5mm to 500mm
  • Surface finish Ra 0.2-0.8 μm on mating surfaces
  • Pressure rating Up to 40 MPa (static), 25 MPa (dynamic)
  • Temperature range -40°C to +200°C
Standards
ISO 3601, DIN 3771, SAE J515, ASTM D2000

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Sealing Rings.

hydraulic seals piston seals diaphragm seals O-rings mechanical seals fluid power components sealing solutions industrial gaskets Sealing Rings Sealing Rings in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Piston / Diaphragm Assembly

A critical assembly within pharmaceutical-grade sterile diaphragm valve actuators that combines piston and diaphragm elements to create a sealed, sterile actuation mechanism.

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Impeller/Piston Assembly

A critical assembly combining impeller and piston functions for fluid pressurization in high-pressure pumps

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Piston & Rod

A critical assembly within hydraulic or electromechanical actuators that converts fluid pressure or electrical energy into linear mechanical motion.

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Engineering Analysis

Risks & Mitigation
  • Fluid leakage leading to system failure
  • Contamination of process fluids
  • Reduced efficiency and energy loss
  • Catastrophic pressure loss in safety-critical systems
  • Environmental contamination from leaked fluids
FMEA Triads
Trigger: Incorrect material selection for fluid compatibility
Failure: Chemical degradation and swelling
Mitigation: Verify fluid compatibility charts and conduct material testing
Trigger: Excessive clearance between mating parts
Failure: Extrusion damage and seal failure
Mitigation: Design appropriate clearance gaps and use anti-extrusion rings
Trigger: Improper installation techniques
Failure: Cutting, twisting, or incorrect positioning
Mitigation: Use installation tools, follow manufacturer guidelines, and train personnel
Trigger: Inadequate surface finish on mating components
Failure: Accelerated wear and leakage paths
Mitigation: Specify and maintain proper surface roughness (Ra 0.2-0.8 μm)

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.10 mm on cross-section, ±0.25% on diameter for standard applications
Test Method
ISO 188:2011 (Rubber aging tests), ISO 815-1 (Compression set), ISO 37 (Tensile testing), ASTM D1414 (O-ring testing), Pressure decay testing per SAE J1205

Buyer Feedback

★★★★☆ 4.7 / 5.0 (38 reviews)

"The technical documentation for this Sealing Rings is very thorough, especially regarding technical reliability."

"Reliable performance in harsh Machinery and Equipment Manufacturing environments. No issues with the Sealing Rings so far."

"Testing the Sealing Rings now; the technical reliability results are within 1% of the laboratory datasheet."

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Frequently Asked Questions

What is the difference between static and dynamic sealing rings?

Static seals are used between non-moving surfaces and rely primarily on compression. Dynamic seals accommodate relative motion (reciprocating, rotating, or oscillating) and require special design considerations for friction, wear, and lubrication.

How do I select the right sealing ring material?

Material selection depends on fluid compatibility, temperature range, pressure, motion type, and environmental conditions. NBR is standard for petroleum-based fluids, FKM for high temperatures and chemicals, and PTFE for extreme chemical resistance.

What causes premature sealing ring failure?

Common causes include improper installation (twisting or cutting), excessive clearance gaps, incompatible fluids, temperature extremes beyond material limits, surface imperfections on mating components, and inadequate lubrication in dynamic applications.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Sealing Ring/Gasket Sealing System