Key Features

• Axial Flexibility: Rubber components compensate for shaft runout and misalignment.

• Double Seal Barrier: Zero emissions option for toxic or hazardous fluids.

• Non-Pusher Protection: The bellows in both the single and double mechanical seal grip the shaft, protecting it from fretting wear and eliminating the need for dynamic O-rings.

• Modular Convertibility: Easy switch between single/double configurations using common parts.

• Optimized Rubber Formulation: High-grade NBR/EPDM/FKM compounds are used in the construction of both the single and double mechanical seal, ensuring long service life and chemical resistance.

Product Specifications

Workshop

This workshop is equipped with professional processing equipment and integrated with standardized material warehousing management, enabling a one-stop production process from precision machining to finished product delivery. It ensures part machining accuracy and production efficiency, meeting various high-specification manufacturing requirements.

Product Research, Development and Testing

Our Product R&D and Testing focuses on optimizing seal performance through advanced simulation and material analysis. All single and double mechanical seals undergo rigorous trials, including thermal cycling and pressure tests, to ensure durability, minimal leakage, and long service life in demanding industrial environments.

Industry Solutions

FAQs About Single and Double Rubber Cartridge Mechanical Seal

Q: When should I choose the Double seal arrangement over Single?

A: You should choose a Double seal if the media is toxic, flammable, hazardous, contains high concentrations of abrasives, or is prone to crystallizing (like sugar syrup or glue). The double arrangement provides a safety buffer fluid that lubricates the faces and prevents process media from leaking into the atmosphere.

Q: What is the difference between the single and double rubber cartridge mechanical seal?

A: The single and double mechanical seal uses one set of lapped sealing faces and is suitable for clean water, HVAC, light chemical, and general-service fluids where minor leakage to atmosphere is acceptable. The double rubber cartridge seal adds a second seal face set and a barrier/buffer fluid chamber, providing extra containment for toxic, hazardous, abrasive, or crystallizing media and helping achieve zero process leakage to the atmosphere. Both share a modular rubber-bellows cartridge platform for quick installation and easy configuration changes.

Q: Why use rubber bellows instead of dynamic O-rings?

A: MIAOYU’s rubber cartridge seals use flexible rubber bellows as the secondary sealing element, which eliminates the need for dynamic O-rings. The rubber bellows compensate for shaft runout and misalignment, grip the shaft to reduce fretting wear, and perform well in abrasive fluids, slurries, and clog-prone applications. High-grade NBR, EPDM, or FKM compounds can be selected according to the pumped medium and temperature range.

Q: Which pumps and industries are these seals suitable for?

A: These single and double mechanical seals are designed for pumps, mixers, agitators, and other rotating equipment in chemical, food, oil, petroleum, pharmaceutical, paper and pulp, and sewage-treatment applications. Depending on the model, they can handle media such as water, light oils, mild chemicals, and wastewater. For hazardous or abrasive services, the double-seal version with barrier fluid support is recommended.