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Hydronic's P820 Series Pumps

Power on Demand.

Functioning When Needed

The major advantage of compressed air-driven hydraulic pumps comes from the fact that they only function when their performance is really needed. This feature is commonly called ‘power on demand’ because such pumps slow down and stop cycling when the air pressure balances the oil pressure through the intensification ratio. For instance, when the actuator in the circuit is not moving, the pump is not cycling. When the directional control valve in the system opens the path from the pump to the actuator, the pump starts up automatically to provide the fluid flow needed to extend the actuator in its work. When the work is done, the directional valve blocks the pathway and the pump stops. It is as simple as that – power on demand! Just think how much energy is saved in a clamping application, a filter press, or a tire press where the pressure is sustained for minutes or hours with only system leakage to be made up.

Features of the P820 Series

  • Five ratios available with reservoirs and sub-plates
  • High performance, the double-acting pneumatic drive section
  • High flow rates at medium to low hydraulic pressure
  • Can mount vertically or horizontally
  • Reservoirs are available in eight sizes of 1/2, 1, 2 1/2, 3, 5, 8, 10, and 20 gallon
  • Air operation means intrinsically safe use in hazardous areas and applications
  • SAE ported manifold with pressure and return connection
  • Installation of directional control valves with D03 pattern subplate
  • Complete units with directional control valves, pressure switches, accumulators, pressure gauges, etc. are available

Featured Pump

P820 Series

  • Double-acting pneumatic/double-acting hydraulic 
  • ATEX Certified (II 2GD cIIB TX)
  • 4,000 PSI maximum hydraulic pressure
  • Up to 6 GPM flow
  • Smoothing kits available
  • Air pilot release
  • Five intensification ratios available

Obediant to System Conditions

If the system downstream is open to the atmosphere or to a tank, the pump will move fluid at the fastest rate it can, given the air energy applied to it. If the resistance to flow downstream is increased a little, the pump will slow its speed to give a little less flow at the pressure required, using the air energy efficiently. When the resistance to flow is increased above the pump’s ability to overcome the pressure required, the pump will cease to function, generating only pressure at the intensified ratio of the air energy. If the ratio of the pump’s oil and air-surface areas is 40: 1, using air pressure at 50 psi will see the pump stalled giving no flow and generating 2,000 psi. The analogy of these three situations can be visualized using just the pump with a simple ball-type shut-off valve in the fully open, partly open, and fully shut positions. This graphic visualization leads us to identify applications ranging from fluid transfer through general hydraulic power to  pore pressure generation. We can divide them into categories to mark the special features of air-driven fluid pumps.


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