One of the most popular science curriculums on the market, Apologia has colorful and bright pages that kids will love. The upper grades are written in an easy to understand style, which comes in handy when learning subjects such as Chemistry or Biology. Dr. Wile (the author), takes special care in writing the curriculum for homeschooling students.
1 Tap is used in the British Isles and most of the Commonwealth for any everyday type of valve, particularly the fittings that control water supply to bathtubs and sinks.
Description. Hydraulic Valve. A hydraulic valve directs the flow of a liquid medium, usually oil, from its input ports to its output ports. The direction of the oil flow is determined by the position of a spool, which is driven by a linear force motor: