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Solinst Double Valve Pump

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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 hundreds of applications. It offers excellent performance and reliability; no bladder replacement and higher pumping rates than with the Bladder Pump; a selection of sizes and materials; variable flow rates; and is field serviceable. The DVP is suitable for low flow or regular flow sampling, and can operate to depths of 2000 ft. (600 m).

Solinst Double Valve Pump can convert to a bladder pump


Easy Decontamination: everything easily accessible; replaceable and with interchangeable parts. All components can be cleaned with mild detergent or non-phosphate soap.

Portable Models: - can be made for any size or depth of application. No tools required for field decontamination. - cart or reel mounted.

Converts to a Bladder Pump: - very easily converts to a Bladder Pump, as most of the parts are the same and bladders are simple to install.

High Flow Rates: - when large purge volumes are required, Solinst DVP can deliver high flow rates. 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. The DVP compares favourably with published data for similar sized pumps under similar conditions, i.e. 42 mm x 610 mm DVP at 100 psi, with 1/2" OD drive and sample lines, at 50 m below water level, gives 3.3 lpm.

High Quality Sampling: - gives excellent VOC results, comparable with bladder pump results. See paper on VOC Retention by Baerg et al, presented at 1992 National Groundwater Sampling Symposium

Deep Applications: - standard systems are suitable to depths of 150m. Specialised controllers, tubing, etc. can be supplied for depths up to 600m.

Non-Vertical Applications: - operates effectively at almost any angle and can be placed under landfills, tailings, storage tanks or plumes.

Miniature Model: - has a dia. of 16 mm to allow cost-effective sampling from wells as small as 19 mm

.Low Cost PVC: - makes dedication more feasible on 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. Further savings are subsequently gained through shorter field operating times. A weight may be used to overcome buoyancy. PVC pumps are also useful for applications where stainless steel is unsuitable such as: metals analysis, sampling highly corrosive liquids, etc.

Leachate/Product Pumping: - stainless steel, pneumatic drive pumps are well suited for pumping contaminant liquids. High solids content, strong solvents and corrosive chemicals are easily and economically pumped. Survives dry pumping, dirty air and sand.

Dedicated Systems
For long term monitoring it is best to dedicate the pumps to reduce sampling time and avoid cross-contamination. Well Caps are designed for ease of use. The vented PVC cap has tubing and cable connectors on the underside; easy-to-attach drive line connector & discharge adaptor; and access holes as required. The cap slips easily onto 2" wells and may be sealed in place with an o-ring. They are available with or without a protective cover for the cap. Adaptors are available to fit 4" or other sizes of well.

Portable Systems
For less frequent sampling, reel and/or cart mounted portable systems allow access to multiple monitoring wells, even in remote locations. The rugged cart mounted system uses large pneumatic tires for easy transport over rough terrain. Reel mounted portable units have a convenient carrying handle where tubing length permits.

The Solinst Double Valve Pump utilises most of the same parts as the Bladder Pump. The standard size is 1.66" dia. by 2 ft. (42 mm x 610 mm). Conversion from one to the other is efficient and easy taking approximately only 2 minutes. It allows faster purging as a Double Valve Pump and lower flow, high quality sampling as a Bladder Pump when desired.

Ordering Information:
SOL 408