All About Engines
Forfatter: Edward Cressy
År: 1918
Forlag: Cassell and Company, LTD
Sted: London, New York, Toronto and Melbourne
Sider: 352
UDK: 621 1
With a coloured Frontispiece, and 182 halftone Illustrations and Diagrams.
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All About Engines
around the rim of which the weights are carried.
Moreover, the steam is not discharged directly into
the atmosphere of the boiler house, but into a pipe
thiough which it can be led outside. As the weights
Fig. 45.—Dead-weight safety valve (Hopkinson's type)
are enclosed
they cannot
be tampered
with, and the
valve is, as
far as possible,
fool-proof.
Sometimes
the safety
valve is fitted
with high and
low - water
floats, as in
Fig. 46, so that
it gives warn-
ing of the
undesirab ly
large or dan-
gerously small
quantity of
water in the
boiler. An in-
spection of
the diagram will show how this acts. The valve
may be raised by the pressure of the steam beneath
it, by the rise of the high-water float, or by the fall
of the low-water float; and the attention of the man