408M Micro Double Valve Pump

The Micro Double Valve Pump (Micro DVP) has a remarkably small and flexible design. It is a pneumatic pump similar to a Bladder Pump, but using coaxial Teflon® tubing, rather than a Teflon bladder to give high quality samples. It is small enough to fit in 1/2” (13 mm) tubing and all channels of the Solinst Model 403 CMT Systems, as its diameter is only 3/8” (10 mm). The unique combination of flexibility and size make the pump easy to transport and install in a variety of applications.

The Micro DVP is ideal for low flow sampling and narrow down-hole applications. Flow rates of 20 to 150 ml/min, are obtained, with very small associated purge volumes from within the narrow applications. The Micro DVP is durable and easy to operate using the pre-sets and fine tubing capabilities built into the Solinst Model 466 Electronic Control Unit.

408 Micro Double Valve Pump Brochure

Advantages

Ideal for narrow, low flow applications
Only 3/8” (10 mm) in diameter
Flexible Teflon, goes almost anywhere
Inexpensive and readily dedicated

Groundwater Sampling in the Following Applications

CMT and Waterloo Multilevel Systems
Direct-Push/Drive-Points
Low flow monitoring in narrow diameters

Operation

Formation water enters through the filter under hydrostatic pressure into both the inner Teflon tube and the annulus of the coaxial tubes. Drive gas/air is cycled down the annular space between the two tubes to close the lower check valve and push the water up the inner sample tube. The pump is then vented to allow new formation water to enter both tubes under hydrostatic pressure. Air/gas pressures are carefully controlled at all times to ensure that the air/water interface never enters the body of the pump. Repeating the pressure/vent cycle brings the high quality sample to the surface at a controlled rate. The Micro DVP operates with 2 ft (0.6 m) or more head of water above the intake.