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How does a foot valve work?
1. Tubing/Valve assembly is installed in well. Water level inside
tubing rises to that in well.
2. A rapid upstroke closes the foot valve and lifts the water column
inside the tubing a distance equal to the stroke.
3. At the end of the upstroke, the water column continues to rise
due to its momentum. A further column of water is thus simultaneously
drawn into the tube.
4. Pushing the tubing down immediately after the upstroke forces
a further column of water into the tubing due to the inertia of the
water column.
5. The cycle is repeated and water rises in pulses to discharge at
the surface.

Low Flow

The Low Flow System is designed to be used in small diameter piezometers (usually 1” ID to 0.75” ID).

D-13
The Delrin D-13 uses .5-in (13mm) OD tubing. Ideal for sampling in piezometers, sampling
damaged wells and custom installations. Flow Rate: 0 - .6 gallons/min (0 - 2.2 L/
min). Lift Capacity: 65.5-feet (20meters).

SS-13
The Stainless Steel SS-13 is used when Delrin is unsuitable for your sampling, developing
or purging processes.The Delrin D-13 uses .5-in (13mm) OD tubing. Ideal for sampling
in piezometers, sampling damaged wells and custom installations. Flow Rate: 0 - .6
gallons/min (0 - 2.2 L/min). Lift Capacity: 65.5-feet (20meters).

SS10
The Micro Flow System is popular for use in direct push technology micro well installations.
The SS-10 with .375-in. OD (10mm) tubing works well in Micro wells, damaged wells, custom
installations and direct push technology. Flow Rate: 0 - .6 gallons/min. (0 - 2.1 L/min).
Lift Capacity: 46-feet (14meters).