Hi-oh10/16/20 series are spring built-in hydraulic buffers, and are used at the bottom of the shaft, if the elevator gets out of order and slides down, it will take the decelerating effect, and the knockout rod will trigger the switch, and then the safety circuit is enabled.

Oh-10:
Rated speed: less than or equal to 1.0m/s
Buffer weigh range: 300kg~2500kg
Pillar gully routing(s): 100mm
Free state (l): 388mm
A*b (mm):150*90
A*b (mm):150*90
Diameter c (mm): 14
Hydraulic oil brand: hl-46
Oil is needed: 0.48l

Oh-16:
Rated speed: less than or equal to 1.6m/s
Buffer weigh range: 700kg~5300kg
Pillar gully routing(s): 175mm
Free state (l): 625mm
A*b (mm):210*100
A*b (mm):270*150
Diameter c (mm): 18
Hydraulic oil brand: hl-46
Oil is needed: 1.7l

Oh-20
Rated speed: less than or equal to 2.0m/s
Buffer weigh range: 1000kg~5300kg
Pillar gully routing(s): 290mm
Free state (l): 915mm
A*b (mm):210*100
A*b (mm):270*160
Diameter c (mm): 18
Hydraulic oil brand: hl-46
Oil is needed: 2.6l