Tungsten Carbide Check Ring with HRA 89-92 Hardness, Wear & Corrosion Resistant and Precision Fit for High-Pressure Systems
Tungsten Carbide Check Ring (also known as anti-backflow ring) is manufactured from high-performance tungsten carbide-cobalt (WC-Co) material. It features extremely high hardness, excellent wear resistance, corrosion resistance, and impact resistance. This product is widely used in high-pressure plunger pumps, hydraulic systems, injection molding machines, oilfield equipment, and other applications requiring unidirectional flow control, effectively preventing medium backflow and ensuring stable system operation.
- Ultra-high hardness: HRA 89-92, significantly better than conventional alloy steels or ceramics.
- Wear & corrosion resistant: Suitable for particle-containing media, acidic/alkaline liquids, and high-temperature & high-pressure environments.
- Precision fit: End faces and sealing surfaces can be mirror-lapped to ensure reliable sealing.
- High fatigue resistance: Long-term use under high-frequency pulsating pressure without cracking or deformation.
- Extended service life: 3-5 times longer than conventional metal check rings.
- Valve assemblies of high-pressure plunger pumps
- Fluid ends of fracturing pumps in oilfields
- Chemical metering pumps
- High-pressure cleaning equipment
- Hydraulic impact tools
| Parameter | Value / Description |
|---|---|
| Material Grade | WC-6%Co / WC-8%Co / WC-12%Co (customizable) |
| Density | 14.5 - 15.0 g/cm³ |
| Hardness (HRA) | 89.0 - 92.5 |
| Transverse Rupture Strength | ≥ 2000 MPa |
| Modulus of Elasticity | 500 - 650 GPa |
| Operating Temperature Range | -50℃ ~ +400℃ (depending on binder phase) |
| Surface Roughness | Ra ≤ 0.1 μm (lapped end face) |
| Outer Diameter Range | 5 mm - 200 mm (customizable) |
| Inner Diameter Range | 3 mm - 180 mm |
| Thickness Range | 2 mm - 30 mm |
| Recommended Fit Clearance | 0.02 - 0.06 mm (depending on media and pressure) |
| Compatible Media | Water, oil, mud, weak acids/bases, sand-containing liquids |
Custom designs are available based on customer drawings, including different chamfers, end-face grooves, stepped bores, etc. Non-standard sizes and integrated sealing solutions can also be provided.
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