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A ball valve is a flow control device which uses a hollow, perforated, and pivoting ball to control fluid flowing through it. It is open when the hole through the middle of the ball is in line with the flow inlet, and closed when it is pivoted 90 degrees by the valve handle, blocking the flow. [ 1] The handle lies flat in alignment with the ...
The two-balloon experiment is an experiment involving interconnected balloons. It is used in physics classes as a demonstration of elasticity . Two identical balloons are inflated to different diameters and connected by means of a tube. The flow of air through the tube is controlled by a valve or clamp. The clamp is then released, allowing air ...
Bag valve mask. A bag valve mask ( BVM ), sometimes known by the proprietary name Ambu bag or generically as a manual resuscitator or "self-inflating bag", is a hand-held device commonly used to provide positive pressure ventilation to patients who are not breathing or not breathing adequately. The device is a required part of resuscitation ...
Telstar was the first 32-panel black-and-white ball used in the FIFA World Cup finals. Only 20 were supplied by Adidas. A brown ball (Germany-Peru) and a white ball (first half of Italy-Germany) were used in some matches. [5] [14] 1974: Telstar Durlast: The first polyurethane coated ball, making it waterproof and resistant to wear and tear. [5 ...
A valve is a device or natural object that regulates, directs or controls the flow of a fluid (gases, liquids, fluidized solids, or slurries) by opening, closing, or partially obstructing various passageways. Valves are technically fittings, but are usually discussed as a separate category. In an open valve, fluid flows in a direction from ...
Control valve. A control valve is a valve used to control fluid flow by varying the size of the flow passage as directed by a signal from a controller. [ 1] This enables the direct control of flow rate and the consequential control of process quantities such as pressure, temperature, and liquid level. In automatic control terminology, a control ...
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