OH-025 Elevator Hydraulic Buffer | EN 81-20/50 Certified Buffer

OH-025 Elevator Hydraulic Buffer | EN 81-20/50 Certified Buffer

OH-025 is a high-grade, energy-consuming hydraulic buffer designed to provide a critical final line of defense for elevator systems. Engineered for precision and durability, this unit is responsible for safely decelerating an elevator car or counterweight should it travel beyond its terminal landing at rated speeds.

Unlike traditional spring buffers that store and return energy (causing a rebound), the OH-025 dissipates kinetic energy as heat through hydraulic friction, ensuring a controlled, smooth, and safe stop for passengers and equipment.

OH-025 Elevator Hydraulic Buffer Technical Specifications

Core Design Features

1. Precision Hydraulic Damping

The internal cylinder features a graduated orifice design. When the plunger is depressed, it forces the HL46 oil through these specific openings. As the compression continues, the resistance increases proportionally, maintaining a constant deceleration rate that minimizes the “G-force” impact on passengers.

2. Robust Construction & Finish

• Piston Rod: The plunger is treated with hard chrome plating to provide superior resistance to corrosion and wear, ensuring the seals remain intact over years of pit service.

• Cylinder Body: Finished with high-visibility safety yellow anti-corrosion paint, designed to withstand the typically damp environment of an elevator pit.

3. Integrated Safety Monitoring

Every OH-025 unit is equipped with a factory-installed electrical safety switch. This switch monitors the plunger position; if the buffer is compressed or fails to return to its full height, the safety circuit is broken, preventing the elevator from operating.

4. Optimized for HL46 Oil

Specifically tuned for HL46 hydraulic oil, the buffer maintains consistent viscosity across a wide temperature range. This ensures that the safety characteristics remain identical whether the building is in a cold climate or a high-heat environment.

Installation & Maintenance Benefits

• Compact Footprint: The OH-025 design is space-efficient, making it suitable for both standard machine rooms and Machine Room-Less (MRL) pits where space is at a premium.

• Easy Inspection: Includes a transparent oil level sight glass, allowing technicians to verify the fluid volume at a glance during routine maintenance.

• Rapid Reset: Features a high-tension internal return spring designed to reset the plunger to its ready position in under 90 seconds after compression.

Ideal Applications

• Residential Passenger Lifts: Perfect for 4 to 8-person elevators.

• Villa & Home Elevators: Provides premium safety for private installations.

• Light Commercial Lifts: Suitable for low-to-mid-rise office and retail buildings.