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|The Solinst Double Valve Pump (DVP) is a pneumatic drive pump that allows consistent, high quality samples. It has been field proven in thousands of applications. It offers excellent performance and reliability. No bladder replacement is required, and the Double Valve Pump provides higher pumping rates than with the Solinst Integra® Bladder Pump. There is a selection of sizes and materials, variable flow rates, and it is field serviceable. The DVP is suitable for low flow or regular flow sampling. The stainless steel pumps can operate to depths of 500 ft (150 m) and the PVC Double Valve Pump can operate to depths of 100 ft (30 m).|
|Low Cost PVC
This makes dedication more feasible for projects where budgets are tight. The lower capital cost allows several PVC pumps to be dedicated for the cost of one portable stainless steel pump. Dedicated pumps also save on field decontamination times and costs. A weight may be used to overcome buoyancy. PVC pumps are also useful for applications where stainless steel is unsuitable, such as:
Survives Dry Pumping, Dirty Air and Sand
|Low Flow Sampling
Gives excellent VOC retention, comparable with bladder pump results. When using the Solinst Model 466 Electronic Pump Controller, the DVP can be adjusted to provide a continuous output of 100 ml/min or less.
Operates effectively at almost any angle and can be placed under landfills, tailings, storage tanks or plumes.
Pneumatic drive pumps are well suited for pumping contaminant liquids. High solids content, solvents, hydrocarbons, and other chemicals are easily and economically pumped.
|Dedicated and Portable Systems|
For long term monitoring it is best to dedicate the pumps to reduce sampling time and avoid cross-contamination. Dedicated well caps are designed for ease of use. Caps easily slip onto 2" or 4" wells, and have quick-connect fittings for the drive and sample tubing.
For less frequent sampling, reel mounted portable systems allow access to multiple monitoring wells, even in remote locations. The reel mounted portable units are free-standing with a convenient carrying handle. They can be made for almost any size or depth of application.
When the pump is placed in a well or borehole, water rises inside the pump and the tubing to static level. Gas supplied from the Controller pushes down on the water column contained in the drive line tubing, closing the check valve at the base of the pump. This forces water up the sample line tubing.
A vent period, during which the gas is released, allows hydrostatic pressure to refill the pump and drive line with sample water. The top check valve prevents water in the sample line from falling back into the pump body. This pressurization and vent cycle is repeated to bring water to the surface.
For proper collection of volatiles, the pressure applied must never be high enough, nor the drive period long enough, to enable gas to enter the body of the pump and aerate the sample. If operated properly, “air” will never come in contact with the sample water, which produces high quality VOC samples comparable to those of a bladder pump.
Flow rates vary with depth of pump below surface, depth below water level, size of drive and sample tubing, drive and vent cycle times, gas pressure applied, aquifer recharge, and size of pump body.
|Electronic Pump Controller|
The Model 466 Electronic Control Unit uses 8 AA batteries that provide up to 30 hours of continuous use. The standard Model 466 gives up to 160 psi. A higher pressure unit providing up to 250 psi. is also available.
The Solinst Control Unit is fully automatic with preset sample modes to give a variety of useful drive and vent cycles. These can be further adjusted manually to optimize the flow. It allows faster purge rates and precise low flow to ensure a representative sample at 100 ml/min or less when sampling for VOCs.
The convenient box is rugged and suitable for all environments. Quick-connect fittings allow easy, instant attachment to dedicated well caps or portable reel units.
|Size and Material Options|
|Solinst offers Double Valve Pumps in either 316 stainless steel with Viton® o-rings, or in PVC with a polyethylene filter. The two standard pump body sizes are:
12 Volt Air Compressor: Portable, designed to operate using a vehicle’s battery. Ideal for field use, especially low flow applications of less than 100 ft (30 m) depth.
Packers: Save time and reduce costs by minimizing the volume of water purged.
In-line Disposable Filters: 0.45μm, with 700 cm2 filter area.
Tag Line: Convenient reel-mounted marked cable, for depth discrete pump support.