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.

Standard Flow

The Standard Flow System is the most popular inertial pump. This system is best suited for 2” monitoring wells and can provide lifts up to 150 feet. Flow rates can be as much as 1 gallon per minute.

	D-25 The Delrin D-25 is the most commonly used Footvalve. The footvalve used is a Delrin D-25 ideal for developing, sampling and purging in 1.25-in. (31.57mm), and larger wells. Used with .625-in. (19mm) OD tubing. Flow Rate: 0 - 1.5 gallons/min. (0 - 6 L/min.) Lift Capacity: 131-feet (40-meters).
	SS-19 The Stainless Steel SS-19 is used when Delrin is unsuitable for your sampling, developing or purging processes.It fi ts easily down 1.25-in. (31.57mm), and larger wells. It features a self tapping female thread, durable, excellent resistance to organics, used with standard .625-in. (19mm) OD tubing. Flow Rate: 0 - 1.5 gallons/min. (0 - 6 L/min.). Lift Capacity: 131-feet (40meters).
	D-16 The Delrin D-16 footvalve is ideal for developing, sampling and purging in .75- in. (19.5mm), and larger wells. Used with .625-in. (25mm) OD tubing the D-16 screews inside the tubing allowing it to be used in narrower wells. Flow Rate: 0 - 1.5 gallons/min. (0 - 6 L/min.) Lift Capacity: 131-feet (40-meters).
	SS-16 The Stainless Steel SS-16 is used when Delrin is unsuitable for your sampling, developing or purging processes.It fi ts easily down .75-in. (19.5mm), and larger wells. Used with .625-in. (25mm) OD tubing the D-16 screews inside the tubing allowing it to be used in narrower wells. Flow Rate: 0 - 1.5 gallons/min. (0 - 6 L/min.) Lift Capacity: 131-feet (40-meters).