285 STEAM ENGINES. loss of capacity is proportional to the length of the distances ad to ah; ad representing the stroke of the compressor. Fig. 4 shows the influence of a discharge valve which is either too heavy, or has too much seat, or too much cushion above. The pressure must first be raised to… … but owing to the large opening suddenly offered to the gas, the pressure falls again below the pressure prevailing in the conden- ser which forces the valve to its seat. The pressure now rises again, but not so high as before, opens the valve, when the pres- sure is again reduced below the…
Brewing · Malt
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