OH-80, OH-175, OH-210 Lift Hydraulic Oil Buffer

The OH-80, OH-175, and OH-210 Lift Hydraulic Oil Buffer series consists of high-performance, energy-dissipating safety devices designed for modern vertical transportation. These elevator components are engineered to provide a controlled deceleration for the elevator car or counterweight in the event of terminal over-travel, ensuring the safe transport of people in both residential buildings and commercial buildings.

As an “energy-consuming” type, these buffers utilize HL46 hydraulic oil to convert kinetic energy into thermal energy, meeting the rigorous safety requirements of EN 81-20/50 and GB 7588.

Key Features and Benefits

• Advanced Energy Consumption: Unlike spring-based buffers, the OH series eliminates the “rebound” effect. The internal piston forces HL46 hydraulic oil through precision-drilled orifices, creating a smooth, constant resistance that protects the lift structure and passengers.

• High weight capacity: These buffers support a wide weight capacity range, making them suitable for everything from small villa lifts to heavy-duty commercial elevator systems.

• Corrosion-Resistant Plunger: The plunger is treated with hard chrome plating to ensure durability in the humid environment of an elevator pit, protecting the seals and extending the life of these vital elevator safety parts.

• Integrated Safety Monitoring: Each unit is equipped with a factory-fitted safety limit switch. If the buffer is compressed, the switch breaks the safety circuit, ensuring the elevator cannot restart until the system is inspected and reset.

• Optimized for Vertical Transportation: The compact design allows for easy installation in both standard and Machine Room-Less (MRL) pits, optimizing space in high-rise buildings.

Maintenance & Inspection

To ensure long-term elevator safety, technicians should conduct regular visual inspections of the oil sight glass. Using the specified HL46 hydraulic oil is critical to maintaining the correct damping characteristics and ensuring the plunger resets within the mandatory 90-second window after a test or impact.