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A double check valve or double check assembly (DCA) is a backflow prevention device designed to protect water supplies from contamination. [1] It is different from the two-way check valves (sometimes erroneously referred to as double check valves) used in air brake systems on heavy trucks which select from the highest pressure source.
Tilting-disc inconel check valve Check valve symbol on piping and instrumentation diagrams. The arrow shows the flow direction. Vertical lift check valve. 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]
Air-actuated control valves each with a 4–20 mA "I to P" converter integral to a valve positioner. In this example each positioner is comparing the valve steam travel against control signal, and applying any correction. The opening or closing of automatic control valves is usually done by electrical, hydraulic or pneumatic actuators. Normally ...
A set of Walschaerts valve gear on 60163 Tornado. Note that the radius bar is set to reverse. The Walschaerts valve gear is a type of valve gear used to regulate the flow of steam to the pistons in steam locomotives, invented by Belgian railway engineer Egide Walschaerts in 1844.
The 1980s MGN W12 F1 engine used rotary valves but never raced. Between 2002 and 2004 the Australian developer Bishop Innovation and Mercedes-Ilmor tested rotary valves for a F1 V10 engine. [12] Bishop Innovations' patent for the rotary valve engine was bought out by BRV Pty Ltd, owned by Tony Wallis, one of the valves original designers.
Internal parts of a typical globe valve. The body is the main pressure-containing structure of the valve and the most easily identified as it forms the mass of the valve.It contains all of the valve's internal parts that will come in contact with the substance being controlled by the valve.
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