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Appendix 1 Glossary of Solar Water Pumping Terms6 Booster Pump - A surface pump used to increase pressure in a water line, or to pull from a storage tank and pressurize a water system. See Surface Pump. Casing - Plastic or steel tube that is permanently inserted in the well after drilling. Its size is specified according to its inside diameter. Cable Splice - A joint in electrical cable. A submersible splice is made using special materials available in kit form. Centrifugal Pump - A pumping mechanism that spins water by means of an "impeller." Water is pushed out by centrifugal force. See also Multi-Stage. Check Valve - A valve that allows water to flow one way but not the other. DC Motor, Brush-Type - The traditional DC motor, in which small carbon blocks called "brushes" conduct current into the spinning portion of the motor. They are used in DC surface pumps and also in some DC submersible pumps. Brushes naturally wear down after years of use, and may be easily replaced. DC Motor, Brushless - High-technology motor used in centrifugal-type DC submersibles. The motor is filled with oil, to keep water out. An electronic system is used to precisely alternate the current, causing the motor to spin. DC Motor, Permanent Magnet - All DC solar pumps use this type of motor in some form. Being a variable speed motor by nature, reduced voltage (in low sun) produces proportionally reduced speed, and causes no harm to the motor. Contrast: Induction Motor. Diaphragm Pump - A type of pump in which water is drawn in and forced out of one or more chambers, by a flexible diaphragm. Check valves let water into and out of each chamber. Driller's Log - The written form on which well characteristics are recorded by the well driller. In most states, drillers are required to register all water wells and to send a copy of the log to a state office. This supplies hydrological data and well performance test results to the public and to the well owner. Drawdown - Lowering of level of water in a well due to pumping. Drop Pipe - The pipe that carries water from a pump in a well up to the surface. Foot Valve - A check valve placed in the water source below a surface pump. It prevents water from flowing back down the pipe and "losing prime." See Check Valve and Priming. 6 Courtesy of Dankoff Solar Products, Copyright ©2002 by Dankoff Solar Products, Inc. 18PDF Image | GUIDE TO SOLAR- POWERED WATER PUMPING SYSTEMS IN NEW YORK STATE
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