skip to Main Content
how it works hero

In 1996 an English engineer, Frederick Philip Selwyn, patented a ‘fluid pressure amplifier’ which differed in many ways to the contemporary ram pump technology by the development of a Venturi Effect waste valve.

This Venturi Valve uses the low pressure generated by high velocity water flow around a curve-shaped elastomeric valve (with low pressure loss) enabling rapid closure and with a relatively small cross sectional area and low weight. The Venturi Valve is configured as a ring section positioned around the supply inlet of the pump with the delivery outlet of the pump being directly in line. This allows the pump structure to be concentric and therefore inherently strong. Upon closure of the valve, it permits efficient water delivery by acting in line with the supply via a second smaller venturi effect delivery non return valve. The elastomeric material and operation of these valves also allows them to self-return without weight or spring assistance.

The unique technology and design dramatically reduces the weight, manufacturing cost and number of components required - as well as providing an overall improvement in efficiency compared to traditional ram pumps.

Meet the Inventor

How it Works

Inside the Papa Ram Pump

how it works section through Papa pump

How It Works - Operation

how it works step 1

Water enters the ram pump through the supply port and flows around the main valve to the exhaust port.

As the flow increases around the main valve, a differential pressure occurs causing the valve to suddenly close. The flow and mass of water is then directed through the non-return valve into the delivery port at a higher pulsed pressure.

how it works step 2

This pressure suddenly reduces causing the main valve to reopen and the cycle repeats.

how it works step 3

Turning the adjuster to open
the valve allows flow through
the pump to be regulated so
that a greater flow generates a
greater pressure and water delivery.

Animation of the pumping cycle

how it works cycle

Papa Ram Pumps At Work

pump-action

Water Delivery Principles

For your zero energy Papa Pump site to be viable you must have...

A spring, stream or river with a flow of at least 50 litres per minute

and the watercourse must fall to give you a Supply Head of a least 1 metre.
The Supply Head is the difference between the highest point of your watercourse and the lowest point across your land

The greater the Supply Head, the greater the amount of water you can deliver
and the higher you can potentially lift the water.

The main objectives to planning an efficient system is to maximise the Supply Head but to keep the Supply Pipe (between the Supply Tank and the Pump) as short as possible.  You can achieve this by running the Feed Pipe (between the Catchment and the Supply Tank) along the contours of the land as shown below.

planning how it works site principles
learn ask faq icon

Will my site be suitable?

measure and plan your site

self install icon spade dig

Ready to Install?

installing your system

faq icon

Want to know more?

frequently asked questions

Back To Top