Solinst Model 408 Double Valve Pumps
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
- Expedited repair and warranty service
- Lifetime technical support
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Overview
The Solinst Model 408 stainless steel double valve pump (DVP) is a pneumatic drive pump that allows consistent, high-quality samples. No bladder replacement is required, and the Double Valve Pump provides higher pumping rates than the Solinst Integra Bladder Pump. There is a selection of sizes and materials, variable flow rates, and it is field serviceable.
Applications
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 interchangeable. All components can be cleaned with mild detergent or non-phosphate soap. Pumps are not damaged by operation in sediment-laden water or dry pumping conditions.
Mechanics
Flow rates vary with the pump's depth below the surface, the depth below water level, the size of the drive and sample tubing, the drive and vent cycle times, the gas pressure applied, the aquifer recharge, and the size of the pump body.
- Solinst Model 408 Stainless Steel Double Valve Pump Specifications
- Solinst Model 408 Stainless Steel Double Valve Pump Operating Principles
- Solinst Model 408 5/8" Stainless Steel Double Valve Pump Operating Instructions
- Solinst Model 408 1.66" Stainless Steel Double Valve Pump Operating Instructions
In The News
Solinst groundwater samplers: Versatile options for a variety of applications
Groundwater sampling can be a challenging task that requires different tools for different applications. Solinst groundwater samplers offer the capability to obtain commonly needed representative samples of groundwater using different approaches of water withdrawal. 
 Solinst’s 425 Discrete Interval Sampler uses passive sampling to grab water from a specific depth. The 407 Bladder Pump enables continuous airtight low flow sampling. The 408 Double Valve Pump can continuously sample at variable rates. 
 “One sampler isn’t necessarily going to be for every site,” said Randy Blackburn, Solinst product manager. 
 Each has different means of fluid sampling. The 425 sampler relies on a manual air pump that pressurizes the sampler based on the water depth.
Read MoreCal Poly, San Luis Obispo Manages Monitoring Efforts in Morro Bay
California Polytechnic State University, San Luis Obispo (Cal Poly, SLO), has been monitoring Morro Bay for decades, and while the monitoring program has changed over the years, the dedication to monitoring the bay has remained the same. 
 
The project started in 2006 as a Packard Foundation-funded initiative to monitor water quality flowing in and out of Morro Bay. The goal at the time was to use the data collected to develop and inform an ecosystem-based management plan in collaboration with the Morro Bay National Estuary Program (MBNEP). 
 
Since the estuary was the focus at the time, researchers were monitoring water flowing into the estuary from Chorro Creek and Los Osos Creek.
Read MoreGreen Water in Green Bay: Using Data Buoys to Monitor the Southern Bay
While the bay of Green Bay has been referred to as the largest freshwater “estuary” in the world, the watershed hosts intensive agriculture and contributes one-third of Lake Michigan’s total phosphorus load. 
 
 The Fox River flows into the bay, carrying excess nutrients largely the result of non-point source runoff from the watershed. With a history of deterioration extending well into the last century, the bay ecosystem suffered significant declines in water quality. 
 
 This, in turn, stimulated major clean-up and ongoing restoration efforts to improve water quality. Tracking these changes is an important aspect of ecosystem management.
Read More