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A check valve, non-return valve, reflux valve, retention valve, foot valve, or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction. [ 1 ] Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave.
The Saturn key, invented by Denis Wedgwood and sold by Wedgewood Brass, [3] aimed to improve on the Amado key by offering an easier evacuation when open. The valve takes the shape of a ball with a ring around the waist, like the planet Saturn, hence the name. The mechanism contains a small steel ball, held in the ring, which blocks the hole.
The balls swing out as speed increases, which closes the valve, until a balance is achieved between demand and the proportional gain of the linkage and valve. A centrifugal governor is a specific type of governor with a feedback system that controls the speed of an engine by regulating the flow of fuel or working fluid , so as to maintain a ...
The process was invented by William Watts of Bristol, England, and patented in 1782. [ 1 ] [ 4 ] The same year, Watts extended his house in Redcliffe to build the first shot tower . [ 5 ] Use of shot towers replaced earlier techniques of casting shot in moulds, which was expensive, or of dripping molten lead into water barrels, which produced ...
The typical valve using this topology in (rare) current commercial production is the 300B, which yields about 5 watts in SE mode. Rare amplifiers of this type use valves such as the 211 or 845, capable of about 18 watts. These valves are bright emitter transmitting valves, and have thoriated tungsten filaments which glow like light bulbs when ...
The heater supply must be isolated from the cathode as unlike the other designs the cathode is not connected to RF ground. Some valves, such as the 811A, are designed for "zero bias" operation and the cathode can be at ground potential for DC. Valves that require a negative grid bias can be used by putting a positive DC voltage on the cathode.
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