Description
The Pillar CB6687-2L is a specialized industrial mechanical seal manufactured by Nippon Pillar Packing Co., Ltd. It is designed for heavy-duty applications, particularly in pumps and agitators where high-reliability fluid containment is required under challenging chemical or abrasive conditions.
Product Parameters
- Model Number: CB6687-2L
- Seal Type: Single Spring, Component-style Mechanical Seal
- Direction of Rotation: Left-Hand (indicated by the “L” suffix)
- Standard Materials: * Seal Faces: Silicon Carbide (SiC) or Tungsten Carbide
- Elastomers: Viton (FKM), EPDM, or Kalrez (FFKM) depending on the chemical environment
- Metal Parts: 316 Stainless Steel
- Operating Pressure: Up to 1.5 MPa (approx. 217 PSI)
- Operating Temperature: -20°C to +200°C (subject to elastomer limits)
- Sliding Speed: Up to 20 m/s
PILLAR CB6687-2L
PILLAR CB6687-2L
PILLAR CB6687-2L
Application Fields
The CB6687-2L is engineered for sectors where fluid purity or containment is critical:
- Chemical Processing: Handling corrosive liquids and solvents.
- Pulp & Paper: Managing black liquor and fiber-heavy slurries.
- Water Treatment: High-pressure filtration and distribution pumps.
- Oil & Gas: Auxiliary cooling and lubrication pumps.
- Mining: Transfer pumps handling abrasive mineral tailings.
Product Usage & Installation
- Shaft Inspection: Ensure the pump shaft or sleeve is free of burrs, scratches, and pitting. The surface finish should be within the manufacturer’s specified tolerance for optimal elastomer seating.
- Rotation Check: CRITICAL: The “L” in CB6687-2L denotes a Left-Handed spring. Ensure the pump’s direction of rotation matches the spring winding to prevent the seal from unwinding and failing during startup.
- Lubrication: Lightly lubricate the elastomers (O-rings) with a compatible lubricant (e.g., silicone grease) to facilitate installation over the shaft.
- Setting Length: Install the seal at the correct “working length” provided in the technical drawing. Improper compression will lead to either excessive face wear or leakage.
- Cleanliness: Maintain a clean environment. Even a fingerprint or a single grain of dust on the polished seal faces can cause an immediate leak upon startup.
Product Technical Description
The CB6687-2L utilizes a robust single-coil spring design. This “open” spring architecture is less prone to clogging compared to multi-spring designs, making it a preferred choice for fluids with higher viscosity or suspended solids. The seal faces are precision-lapped to light-band flatness, creating a microscopic fluid film that lubricates the faces while preventing the process medium from escaping. The “2” in the designation typically refers to the secondary seal (O-ring) configuration and specific face material combinations optimized for longevity.
Q&A (Common Questions)
Q: What does the “L” signify in the part number? A: It indicates a Left-Handed spring winding. If your pump rotates clockwise (when viewed from the drive end), you must ensure the spring is wound in a direction that tightens during operation.
Q: Can I replace the O-rings with a different material later? A: Yes, the elastomers can be swapped (e.g., from Viton to EPDM) as long as they are the correct size and compatible with the Pillar seal cage.
Q: Why is my seal leaking immediately after installation? A: This is usually due to “setting length” errors or damaged seal faces. If the faces were bumped during installation, even a microscopic chip will prevent a proper seal.
Similar Model Recommendations
- Pillar CB6687-2R: Right-Handed version of the same seal.
- Pillar US Type: Standardized unbalanced seal for general water service.
- Pillar EA560: Alternative elastomer bellows seal for compact pumps.
- Pillar BK Series: Specialized seals for high-viscosity resins.
- Pillar 5610: Cartridge-style upgrade for easier installation and maintenance.
For technical drawings or to inquire about availability for the Pillar CB6687-2L and other mechanical seal components, please contact our support team.
