The Solinst Model 408 stainless steel 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). Everything is easily accessible; replaceable and with interchangeable parts. All components can be cleaned with mild detergent or non-phosphate soap. Pumps are not damaged by operation in sediment laden water, or in dry pumping conditions.

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.

Features:

• Positive displacement, gas drive pump provides consistent samples with excellent VOC results

• Pneumatic drive pumps are well suited for pumping contaminant liquids

• No bladder replacement is required, and provides higher pumping rates than bladder pumps

What's in the Box:

• Solinst 103104 Model 408 Stainless Steel Double Valve Pump, 5/8"

Brochure/Datasheet

Instruction manual

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