What are the safety components in a hydraulic elevator?
Cushioned stop (EN 81.2, 12.2.3.)
It is a stop located at the bottom of the rod (inner part of the piston subject to movement). It has a double mission: to cushion and prevent the rod from coming out of the cylinder. It is also a mandatory safety measure according to Regulation En 81.2, section 12.2.3.3.
Hand pump (EN 81.2, 12.9.2)
This is an emergency and rescue element normally located in the valve group itself. It is used to release the parachute valve or the parachute from the chassis once they have been activated. This allows, subsequently and by means of the emergency button, to move the cabin to the nearest lower level. One of the advantages of this device is that the rescue manoeuvre does not necessarily have to be carried out by a technician. In hydraulic lifts it is a mandatory safety system according to Regulation En 81.2, section 12.9.2.
Emergency button (EN 81.2, 12.9.2)
It is a button located in the red valve group. When the cabin is between two floors and neither the parachute valve nor the chassis parachute have been activated, the emergency button is used to lower the cabin to the nearest lower level. In the same way as the Hand Pump, it is a manoeuvre that can be carried out by any person on foot, without the need for the intervention of a technician. It is a mandatory safety measure in hydraulic systems according to Standard EN 81.2, section 12.9.2.
Emergency battery
In the event of an emergency due to a power failure, hydraulic lifts allow the cabin to descend to the nearest level using an emergency battery (located in the control panel) and a 12 V coil (located in the lowering solenoid valve). The emergency battery also allows the doors to be opened to prevent anyone from being trapped inside the cabin. This safety measure is not mandatory, but practically all hydraulic lifts today have this system as standard due to its low cost. In the case of electric lifts , this device is more expensive financially and consequently its presence is much greater in hydraulic lifting systems than in electric ones.
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13 comments
The emergency battery should be mandatory. I think it should be present in both hydraulic lifts like the electrical system.
Good morning,
First of all, we would like to thank you for the interest you have shown in our blog. In response to your comment, we wanted to inform you that the standard does not require the installation of an emergency battery in all lifts. The system in hydraulic lifts is simply a 12 V battery in the panel and a 12 V coil in the hydraulic unit. We provide this coil as standard in all our units. For electric lifts, the system is much more complex, as batteries with a higher capacity must be installed and a converter must be used to transform the direct current from the batteries into alternating current to move the machine's motor.
Greetings,
Hello! I would like to know what the basic steps are for general maintenance of these machines, the tasks that cannot be missed for proper maintenance. Thank you very much!
Thank you for your inquiry Mariana, on our website you can find a Preventive Maintenance Guide See: http://www.gmveurolift.es/images/stories/mantenimiento.pdf
We hope you find it useful.
Thank you so much!
Good morning. I am from Argentina and I work as an inspector in my city of Rosario. I would like to know if there is any kind of advantage in installing a variable speed drive on the motor that controls the hydraulic pump. Regards. Thank you.
Hi Julio, «the variator allows you to restrict the current consumed by the motor. But the lower the motor consumption, the lower the speed of the elevator when going up. Installing a variator in a hydraulic elevator has its advantages and disadvantages:
Advantages: you can control the engine consumption as well as the engine acceleration and deceleration ramps.
Disadvantages: If used as a fuel-saving device, it may not be feasible in some cases when lowering the speed too much. It may not be compatible with the existing valve assembly.
The elevator emergency alarm call works during a power outage, is it connected to a battery?