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Richardson was the first person who made a safety valve which, while it automatically relieved the pressure of steam in the boiler, did not, in effecting that result, reduce the pressure to such an extent as to make the use of the relieving apparatus practically impossible because of the expenditure of time and fuel necessary to bring up the steam again to the proper working standard.
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.
See also priming. Check valve Clack valve Clack from the noise it makes. A non-return valve where the feedwater enters the boiler drum. They are usually mounted halfway along the boiler drum, or else as a top feed, but away from the firebox, so as to avoid stressing it with the shock of cold water.
The snifting valves may be mounted directly on the cylinders or steam chests. The drawback of this arrangement is that they admit cold air which cools the cylinders and leads to condensation when the steam is turned on again. If a superheater is fitted, one or two snifting valves may be mounted on the "wet" side of the superheater header.
Most piston valves are of the "inside admission" type, where fresh steam is introduced from the boiler via the space between the two piston heads of the valve, and exhaust steam leaves via the space between a piston head and the end of the steam chest.
The firm's introduction of the groove-packed plug cock in 1875 was a major innovation because it made steam safety valves easier to operate. [6] Sir John Dewrance, [7] who was married to the granddaughter of Richard Trevithick took over the business in 1879. [8] In 1937 after Dewrance's death it became a wholly owned subsidiary of Babcock ...
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