Solinst\u00a0Double Valve Pumps<\/h2>\n

Download Technical Bulletin<\/a><\/div>\n

Double Valve Pumps<\/a> can provide high quality, representative groundwater samples. However, to get the best quality samples from your pump, it is critical to understand how the Double Valve Pump works and how to operate it properly.<\/p>\n

Solinst 1.66″ and 5\/8″ Stainless Steel Double Valve Pumps<\/p><\/div>\n

Double Valve Pump Operating Principles<\/h2>\n

When a Double Valve Pump is submerged, hydrostatic pressure forces water through the filter intake in the base of the pump, filling the pump body and both the drive and sample lines to static level.<\/p>\n

Pressure is applied to the drive line using a compressed air source and a pump control unit. During the drive period on the control unit, the pressure pushes down on the water column in the drive line, which forces the water in the pump up the sample line. A check valve at the bottom of the pump closes to prevent water from exiting the pump during the drive period.<\/p>\n

After the drive period, the pump control unit switches to vent, and pressure is released. New formation water flows into the pump and drive line, while a check valve at the top of the pump closes to prevent water from draining back down the sample line.<\/p>\n

After venting, pressure is re-applied, again forcing water from the pump and raising the water in the sample line closer to the surface. Repeating the drive and vent cycle will eventually cause the water in the sample line to discharge at surface in a gentle pulsating flow.<\/p>\n

See the\u00a0Double Valve Pump Operating Principles<\/strong><\/a>\u00a0document for a detailed illustration of the Double Valve Pump operation, or check out the video below.<\/p>\n