Plans for making a hydraulic ram pump

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Realization of a hydraulic ram (experimental but perfectly functional) byUniversity of Orléans

A hydraulic ram is a pump that uses the energy of the water to go up a certain amount of water much higher than the initial water during the height.

It is a self-powered pump that pumps "free" about 30% of the water flowing through it.

hydraulic ram scheme
assembly diagram, click to enlarge

The principle is simple and a ram is easily achievable through commercial plumbing parts.

More: hydraulic ram, the ecological pumping

Here is the presentation of a ram test bed created by a professor from the University of Orleans. You can discuss with him our forum devoted to the manufacture of a hydraulic ram.

Overview and performance

A tank with a capacity of 10 liters is placed at the outlet of the lift column (5.20 m).

The measured time to fill the tank is 6 minutes, this measure does not take into account the system boot time.


- Volume remaining in the tank "fall": 72 liters
- Volume recovered 10 liters
- Volume lost 35 liters
- Efficiency: 10 / 35 28% =

For an operating time of 1 100 liters time we recovered ...

hydraulic ram ball

hydraulic ram tank

Details on the implementation of the valve and the ram

One piece is to change the brass strainer. It adds a filtetée rod with a dual function: to guide the oscillation of the valve and adjusting the automatic reopening time of the valve according to the mass applied to them (80 grams in assembling shown here). This mass will obviously be unique to each assembly (pressure / flow ...)

parts of a hydraulic ram
Parts of a ram

realization of the valve
Realization of the ram valve: a slightly modified brass strainer.

Photos general assembly

hydraulic ram operation
assembled hydraulic ram and running

- Presentation of the hydraulic ram principle
- Video of a ram in operation
- Follow-up of the study and realization of a hydraulic ram on the forums


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