Metal P-Ring Seal (Comma-Ring) - Sonkit Sealing Solutions

Product Description

The Metal P-Ring seal, also professionally known as the Metal Comma-Ring, is a high-performance, resilient sealing element specifically engineered for axial pressure orientations and slow dynamic shaft applications. Its unique "comma" geometry consists of a curved, pressure-energized base joined to an extended sealing lip, bridging the gap between static sealing and limited dynamic motion.

Critical Surface Requirements: Because these seals are used in semi-dynamic motions, the mating shaft or bore surface must be mirror-polished and possess high hardness (typically >60 HRC).

Dual-Energization: The seal functions by utilizing both the inherent mechanical elasticity of the metallic substrate and the system's hydrostatic pressure to augment contact stress.

This design allows for better control of seal lip interference compared to standard C-rings, ensuring a consistent footprint even during limited joint movement. Silver plating is highly recommended to provide anti-galling properties during rotational cycles.

Op. Temperature

-270°C ~ +750°C

Work Pressure

Up to 250 MPa

Suitable Media

Oil, Water, Gas

Leakage Rate

≤1E-10 Pa·m³/s

Materials

Inconel / SS / Alloys

Specifications & Options

Outer Diameter Range

20mm to 200mm

Cross Section Range

1.6mm to 4.8mm

Product Shapes

Round, Rectangular, Racetrack

(Customized shapes available)

Pressure Direction

Internal & External

Material Options

Alloy 718, X-750, 316/321 SS

Plating & Coating

Silver (Recommended), Gold, PTFE

To reduce friction & wear

Application Type

Slow Dynamic / Axial

Vacuum Performance

Up to 1E-10 Pa·m³/s

Warranty

3-year warranty period

Application Characteristics

Dual Energization & Control

Functions through a dual-energization principle utilizing both mechanical elasticity and hydrostatic pressure. The design offers Controlled Interference, ensuring a consistent footprint superior to standard axial C-rings even during limited joint movement.

Surface Interface Requirements

Critical for semi-dynamic motions: The mating shaft or bore surface must be mirror-polished and possess high hardness (typically >60 HRC) to prevent wear or deterioration of the hardware.

Galling Protection & Performance

Frequently silver-plated to reduce friction and provide excellent anti-galling properties during rotational cycles.

High Temp Resistance

High Pressure Resistance

Wear Resistance

Corrosion Resistance

Why Choose Sonkit Industry?

Sonkit specializes in metallic seals, serving customers from diverse industries worldwide, including Global Fortune 500 Companies.

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