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The principle and historical source of valve control flow direction
Since the valve only allows water or other fluids, such as air, to flow in one direction, it is almost certain that it first appears as a component of the bellows, an early tool that requires this type of movement. In his study of the Renaissance metallurgical articles, Agricol said that the wrought-iron furnace bellows had a slightly longer and wider sheet than the eye, "the sheet was covered with goatskin and was strapped to the board , Burrs side of the ground ". The way it is placed is that when the bellows is up the sheet opens and when the bellows contracts the sheet closes. "The flap valve is certainly far ahead of the Age of Agricola, just as old as a wedge-shaped bellows, but the exact age of its arrival is hard to pin down because the term flap valve came from the ancient leather bellows In the bellows, the man in operation can block the eye with his feet or hands.) Obviously, the earliest models were about the bronze lamps of the Greek dynasty, but no one mentioned before the late Roman poet Oznius Bronze lamp Ossnius compares the gills of quick-on-the-ground fish to the wool valve that alternately feeds air and winds through the perforations during reciprocation in the alder lumen. It can be said that the history of the use of valves mechanically Starting with the pressure pump at Cortesbie, Vélvelvis and Hercules describe the pressure pumps in detail, they say: "The ring-shaped foil snugly anchored in the mouth of the tube will not let the stuffing in the container Go back and run again. "It seems that the original petal valve of the Ketcibian pressure pump was long-barrel shaped and had been used to ventilate the roof at the time and later switched to a rectangular valve, but the name remained unchanged. Several Roman pressure pumps have been repaired, When the valve was severely corroded but still recognizable, Heron, referring to the dual cylinder pressure pump for fire extinguishers, introduced a primitive beating valve and some small discs sliding down and sliding on three benches. In addition to all the pumps and bellows valves were flap valves (or hinged valves) prior to the Renaissance, the hydraulic components of Kitsiembi had spool valves to control the passage of air into the pipes. Leonardo da Vinci's invention A kind of conical beating tongue is undoubtedly the source of those words delineated in Lameley's Mechanical Inventories 1588. Alleotti, contemporary with Lameley, adopted in the automatic puppet show A butterfly valve to control the flow of water in the pipeline.But from the time of Heron until the invention of a steam engine, none of these jerk tongues have been widely used, and there has not been any change in various valves.Steam machines (which require the inflow and outflow in order More refined ) Led to the advent of sophisticated valves related to the operation of the engine, including the "jet valve" designed by Newkinds to release the air trapped in the cylinder, the spool valve (1799) by Murdoch, Engine pistons maintain a balanced counterbalance valve. EDIT: Exhibition Eagle