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A submersible pump, which is the type most often used in drilled wells, consists of a pump and motor unit. The pump is placed directly into the well, below the water level. Jet pumps are not installed in the well, but installed above ground. Jet pumps operate by forcing water through a jet or Venturi, a narrow, cone-shaped device that creates a partial vacuum (suction) and draws water from the well into the pumping system. Shallow well jet pumps that are used where the water is less than 25 feet below the surface have the jet located in the pump itself.
The sequence valve is located on the front of the gate tower. This location prevents dirt from building up on the tongue of the scraper. The location allows the gate cylinder to be rotated with the ports facing up, providing improved hose routing on the scraper and sequence valve.hen the gate is fully opened, the sequence valve switches the hydraulic fluid over to the bucket cylinder to start dumping the material. When the ejector wall returns to the rear position, the sequence valve switches the hydraulic oil over to the gate cylinder to start closing the gate.