Automatic and semi-automatic air-hydraulic pumps with various types of drive and flow rates from 0.1 to 0.8 l / min

Our HP series air hydraulic pumps are designed to use hydraulic oils or glycols for the operation of single acting spring return cylinders. High oil pressures up to 1,000 bar, large flow rates (l / min) and extremely compact dimensions are the hallmark of the series.

Air-hydraulic pumps with manual lever operation HP Series

  1. HP Single acting, pedal operated, oil flow rates from 2.1 to 0.1 l / min, oil pressures from 100 to 1,000bar, tank capacities from 1.4L to 4L
  2. HP-AP Single acting, stall / restart continuous cycle operation, pneumatic RC valve for release, oil flow rates from 2.1 to 0.1 l / min, oil pressures from 100 to 1,000bar, tank capacities from 1.4L to 4L
  3. HP-RC Single acting, double pneumatic RC valve for advance / release, oil flow rates from 2.1 to 0.1 l / min, oil pressures from 100 to 1,000bar, tank capacities from 1.4L to 4L
  4. HP-REMOTE Single acting, pneumatic remote control 2 push / release buttons, oil flow rates from 2.1 to 0.1 l / min, oil pressures from 100 to 1,000bar, tank capacities from 1.4L to 4L
  5. HP-LEVER Single acting, manual lever operation, oil flow rates from 2.1 to 0.1 l / min, oil pressures from 100 to 1,000bar, tank capacities from 1.4L to 4L

Features HP Series Air Hydraulic Pumps

  1. They can also operate double-acting cylinders with 4-way distributor valve (optional).
  2. Orienting oil port for easy hydraulic connections.
  3. Connectable to the normal 5/8 pneumatic network (max 10 bar)
  4. Built-in differential type release valve, hydraulically balanced to eliminate opening shocks and allow a fast and controlled oil return
  5. Replaceable internal air filter, as well as an externally adjustable relief valve for the protection of the circuit components.
  6. HP version with 3-position pedal for advance / hold / release.
  7. HP-RC version for pneumatic or remote operation (HP-Remote) via manual button control.
  8. HP-Lever version for convenient manual lever operation (ideal for crimpers and bench work).
  9. HP-AP version for automatic in-line drives (ideal for locking systems, automati

HP Series Air Hydraulic Pumps: additional benefits

  1. Inlet air filter and internal oil filter to protect the pump and the system parts
  2. Externally adjustable relief valve
  3. Versatile install in both horizontal and vertical position
  4. Low energy costs

Hydraulic oil flow (l/min)

The hydraulic pressure of the pump depends mainly on the reduction ratio, the calibration pressure of the relief valve and the pressure of the pneumatic inlet air.
The hydraulic pressure increases or decreases proportionally to the increase or decrease of the inlet air pressure.
Therefore the flow rate (l / min) increases or decreases proportionally to the increase or decrease of the hydraulic pressure.
The flow diagrams show the performance trend in combination with the working pressure at several inlet air pressures (ref. to the technical data sheets).

Pneumatic air flow (l/min)

BELL pumps of the HP Series work in an air inlet pressure range from 3bar to max 10bar.
The average air consumption is 340 l/min.
An air lubricator is not required, however it is highly recommended to have a condensate filter to dry the inlet air.
The diagrams show the air consumption related to the working pressures and the flow rates (ref. to the technical data sheets).

Stall/restart pressure

All BELL pumps of the HP series can work at a constant hydraulic pressure by adjusting the air inlet pressure (stall).
The air inlet pressure has to be set-up so that the pump stalls at the required output pressure value (the calibration of the relief valve must exceed the operating pressure value so as not to compensate).
Whenever the hydraulic pressure decreases (circuit leaks – pressure drop), the pump compensates automatically and restores the set value (the air pneumatic network must be always connected to the pump).
The stall/restart diagrams show the pressure values in different conditions.
It is recommended to check the settings by restarting the pump from time to time
A slight loss of air during operation in these conditions is completely normal.

All BELL products are designed and manufactured within BELL SRL in via F. De Pisis, 5 – 42124 Reggio Emilia (RE) – Italy, according to the Quality Standards that distinguish the MADE IN ITALY from the Rest of the World.