How To Make A Ram Pump – Build A Zero-Energy Water Lifting System

ByJim Boslice Metalworking & Fabrication

A hydraulic ram pump uses the kinetic energy of flowing water to pump a portion of that water to a much higher elevation without electricity or fuel. By utilizing the “water hammer” effect created by a closing waste valve, the pump forces water through a check valve and into a pressure chamber, which then pushes the water up a delivery pipe.

To build one, you will need standard PVC or galvanized pipe fittings, including two check valves, a pressure tank (often made from a large PVC pipe), and a drive pipe with a consistent downward slope. It is a perfect weekend project for off-grid irrigation or livestock watering.

Do you have a spring, creek, or stream on your property that sits lower than your garden or storage tank? Moving that water uphill usually requires an expensive electric pump or a noisy, gas-guzzling engine that needs constant refueling.

I promise that by the end of this guide, you will understand exactly how to harness the power of gravity and physics to move water for free. Learning how to make a ram pump is a game-changer for any homesteader or DIYer looking to increase their property’s self-sufficiency.

We are going to walk through the mechanics of the “water hammer” effect, the precise list of parts you need from the hardware store, and the assembly steps to get your pump clicking away. Let’s dive into the workshop and build a tool that works as hard as you do.

Understanding the Mechanics of the Hydraulic Ram

Before we start cutting pipe, we need to understand the physics that makes this machine “breathe.” The ram pump is a cyclic device that relies on the momentum of moving water to create high-pressure spikes.

When water flows down a drive pipe, it gains speed until it forces a waste valve to slam shut. This sudden stop creates a massive pressure surge, known as a water hammer, which forces a small amount of water through a second valve.

This secondary valve, called the delivery check valve, opens only when the pressure in the pump body exceeds the pressure in the delivery line. This allows water to enter a pressure chamber where trapped air acts as a spring.

The Essential Components and Material Selection

Choosing the right materials is critical for longevity and performance. While you can use galvanized steel for a heavy-duty setup, Schedule 40 PVC is the most common choice for DIYers because it is affordable and easy to join.

You will need a drive pipe, which is the long intake line that brings water from your source. This pipe must be rigid; do not use flexible hoses here, as they absorb the kinetic energy we need to pump water.

The “heart” of the pump consists of a series of tees, nipples, and valves. You specifically need a swing check valve for the waste valve and a spring-loaded check valve for the delivery side.

The Bill of Materials

For a standard 1-inch ram pump, gather the following items at your local plumbing supply house:

  • One 1-inch Brass Swing Check Valve (the waste valve).
  • One 1-inch Brass Spring Check Valve (the delivery valve).
  • One 1-inch PVC Tee and several 1-inch PVC Nipples.
  • One 3-inch or 4-inch PVC pipe (about 24 inches long) for the pressure chamber.
  • Two PVC End Caps for the pressure chamber.
  • A Ball Valve for the delivery line and one for the drive line.
  • High-quality PVC primer and cement.
  • Teflon tape or pipe dope for all threaded connections.

Step-by-Step Guide on how to make a ram pump

Now it is time to assemble the unit. Start by laying out your components on your workbench to visualize the flow of water from the source to the delivery line.

First, construct the pump body by connecting your main tee to the drive pipe inlet. Attach a short nipple to the top of the tee, followed by your swing check valve. Ensure the swing check valve is installed so that gravity keeps it open by default.

Next, attach another nipple to the side of the tee and install your spring check valve. This valve must be oriented so that water can flow out of the pump body but cannot flow back in.

Building the Pressure Chamber

The pressure chamber is vital for smoothing out the pulses of the pump. Take your large diameter PVC pipe and glue an end cap securely to one end using solvent weld.

On the other end, use a reducer fitting to bring the diameter down to match your 1-inch pump body. Connect this assembly to the outlet side of your spring check valve.

Ensure this chamber is airtight. If air leaks out, the pump will lose its “cushion,” and the constant hammering will eventually crack your fittings or pipes.

Final Assembly and Delivery Line

Install a tee after the spring check valve but before the pressure chamber. This tee will serve as your delivery outlet where you connect the smaller pipe that leads uphill.

I recommend installing a ball valve on both the drive pipe entrance and the delivery outlet. This allows you to shut off the system for maintenance without draining your entire supply line.

Double-check all threaded joints. Use plenty of teflon tape and tighten them with a pipe wrench, but be careful not to over-tighten and crack the plastic threads.

Site Selection and Installation Requirements

A ram pump will not work on flat ground. You need a fall (the vertical distance the water drops from the source to the pump) to create the necessary velocity.

The general rule of thumb is a 1:7 ratio. For every 1 foot of vertical fall you have, you can realistically lift water about 7 feet into the air at the delivery end.

Your drive pipe should be between 5 and 10 times the length of your vertical fall. If the drive pipe is too short, the water hammer won’t have enough mass; if it’s too long, friction will slow the water down too much.

Tuning the Pump for Maximum Efficiency

Once the pump is installed, it likely won’t start on its own. You have to “prime” the system by manually pushing the waste valve open and shut several times.

As you depress the valve, water will spurt out. When you release it, the valve should slam shut, and you will hear a distinct metallic click. Repeat this until the delivery line fills with water and the pump begins to cycle automatically.

You can tune the “beat” of the pump by adjusting the stroke of the waste valve. A faster beat usually pumps more water but with less lifting power, while a slower, heavier beat can push water much higher.

Adjusting the Waste Valve

If your swing check valve has a threaded bolt on the flapper, you can add or remove washers to change its weight. A heavier flapper stays open longer, allowing the water to reach a higher velocity before closing.

This increases the pressure spike. Experiment with different weights until you find the “sweet spot” where the pump cycles consistently without stopping or stalling.

Common Pitfalls and Troubleshooting

The most common reason a pump stops is trapped air in the drive pipe. If there is a high spot in your drive line, air bubbles will collect and act like a shock absorber, killing the water hammer effect.

Always ensure your drive pipe has a continuous downward slope. If the pump stops clicking, check your source for debris like leaves or silt that might be clogging the waste valve.

Another frequent issue is a waterlogged pressure chamber. Over time, the air in the chamber can be absorbed into the water. If your delivery flow becomes “jerky” or the pump sounds loud and violent, drain the chamber to let fresh air back in.

Advanced Modifications for Power Users

Once you master the basics of how to make a ram pump, you can explore more complex designs. Some DIYers use multiple waste valves in parallel to increase the volume of water moved.

You can also install a snifter valve. This is a tiny hole or a specialized valve in the pump body that sucks in a tiny bubble of air with every stroke.

This small amount of air travels into the pressure chamber, automatically replenishing the air cushion. This modification allows the pump to run for months or even years without manual maintenance.

The Future of Sustainable Water Management

In an era of rising energy costs, the ram pump is a testament to the brilliance of 18th-century engineering. It remains one of the most sustainable ways to manage water on a homestead.

As we look toward more regenerative agriculture practices, these pumps offer a way to irrigate crops and water livestock with zero carbon footprint. They are durable, repairable, and rely on nothing but the laws of nature.

By building your own, you are not just saving money; you are gaining a deep understanding of fluid dynamics and mechanical engineering. It is a rewarding project that pays for itself in a matter of weeks.

Frequently Asked Questions About Ram Pumps

How much water can a ram pump actually move?

While a ram pump is very efficient in terms of energy, it is not efficient in terms of water volume. Generally, a ram pump will deliver about 10% to 20% of the water that flows through it, while the remaining 80% to 90% passes through the waste valve and back into the stream.

Does a ram pump work in the winter?

Yes, as long as the water source is flowing and the pipes are buried below the frost line or insulated. The constant movement of water through the pump usually prevents freezing, but the waste valve area can develop ice if temperatures drop significantly.

What is the best material for the drive pipe?

Galvanized steel or thick-walled Schedule 80 PVC is best. The drive pipe must be extremely rigid to transmit the pressure wave back to the pump. Using thin-walled pipe or flexible tubing will significantly reduce the pump’s efficiency and lift height.

How high can a DIY ram pump lift water?

With enough fall and a well-tuned system, a DIY ram pump can lift water over 100 feet. However, the higher you lift the water, the lower the delivery volume will be. Most home systems are optimized for a lift of 30 to 50 feet.

Start Your Water Project Today

Building your own pumping system is one of the most satisfying projects you can undertake in your home workshop. It combines carpentry-like precision in plumbing with the rugged utility of metalwork and fluid physics.

Now that you know how to make a ram pump, the only thing left is to gather your fittings and head out to the creek. Start small, test your fall-to-lift ratios, and don’t be afraid to tweak the waste valve until the rhythm is perfect.

Take pride in the fact that you are moving water using nothing but the strength of the stream and the quality of your craftsmanship. Stay safe, keep your threads tight, and enjoy the sound of free water flowing uphill!

Jim Boslice
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