- times it is desirable to reduce the pressure of the steam , so as to work a low - pressure engine from a high - pressure boiler . There are a variety of plans for doing so ; we have an equilibrium valve , actuated by the pressure of the steam acting on a piston open to the atmosphere , and… … Fig . 23 . — Steam - reducing Valve . A , Valve . B , Piston , c , Lever and being connected to the valve by a screwed spring - balance . d , Branch from boiler . E , Branch to cylinder . rod and nuts . The combined circumfer - ential openings in the valve are equal in area to that of the pipe from…
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