Technical Background
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.
His valve was the first which had the strictured orifice to retard the escape of the steam and enable the valve to open with increasing power against the spring and close suddenly, with small loss of pressure in the boiler.
Read more about this topic: Consolidated Safety-Valve Co. V. Crosby Steam Gauge & Valve Co.
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