Pressure vessel
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A pressure vessel is a container designed to hold gases or liquids at a pressure substantially different from the ambient pressure.
A welded steel pressure vessel constructed as a horizontal cylinder with domed ends. An access cover can be seen at one end, and a drain valve at the bottom centre.
Spherical gas container.
Picture of the bottom of an aerosol spray can.
Composite overwrapped pressure vessel with titanium liner.
Railway air brake
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A railway air brake is a railway brake power braking system with compressed air as the operating medium. Modern trains rely upon a fail-safe air brake system that is based upon a design patented by George Westinghouse on April 13, 1869. The Westinghouse Air Brake Company was subsequently organized to manufacture and sell Westinghouse's invention. In various forms, it has been nearly universally adopted.
Piping diagram from 1909 of a Westinghouse 6-ET Air Brake system on a locomotive
Control handle and valve for a Westinghouse air brake
Rotair Valve Westinghouse Air brake Company
1918 drawing of a triple valve