![File:Double-beat valve, from beam engine cylinder (New Catechism of the Steam Engine, 1904).jpg - Wikimedia Commons File:Double-beat valve, from beam engine cylinder (New Catechism of the Steam Engine, 1904).jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/thumb/3/32/Beam_engine_cylinder_with_double-beat_valves_%28New_Catechism_of_the_Steam_Engine%2C_1904%29.jpg/220px-Beam_engine_cylinder_with_double-beat_valves_%28New_Catechism_of_the_Steam_Engine%2C_1904%29.jpg)
File:Double-beat valve, from beam engine cylinder (New Catechism of the Steam Engine, 1904).jpg - Wikimedia Commons
![Double-beat valve from beam engine cylinder 28New Catechism of the Steam Engine 190429 Stock Photo - Alamy Double-beat valve from beam engine cylinder 28New Catechism of the Steam Engine 190429 Stock Photo - Alamy](https://c8.alamy.com/comp/JFY5X5/double-beat-valve-from-beam-engine-cylinder-28new-catechism-of-the-JFY5X5.jpg)
Double-beat valve from beam engine cylinder 28New Catechism of the Steam Engine 190429 Stock Photo - Alamy
![Cassier's magazine. ice. The steam and exhaust valve seats,shown in black section, are insertedand held in place by the covers aboveand below them, respectively, with theview of allowing their free expansionand Cassier's magazine. ice. The steam and exhaust valve seats,shown in black section, are insertedand held in place by the covers aboveand below them, respectively, with theview of allowing their free expansionand](https://c8.alamy.com/comp/2CF3P3H/cassiers-magazine-ice-the-steam-and-exhaust-valve-seatsshown-in-black-section-are-insertedand-held-in-place-by-the-covers-aboveand-below-them-respectively-with-theview-of-allowing-their-free-expansionand-contraction-without-alteration-ofform-the-gear-here-illustrated-isknown-as-the-no-2-and-is-applied-toengines-of-16-inch-cylinder-diameterand-upwards-it-consists-of-double-beat-lifting-or-poppet-valves-their-mo-tion-being-derived-from-a-rotating-lay-shaft-driven-at-the-same-speed-as-thecrankshaft-by-mitre-wheels-referring-now-to-the-cross-sectionin-fig-19-the-upper-ends-of-the-2CF3P3H.jpg)
Cassier's magazine. ice. The steam and exhaust valve seats,shown in black section, are insertedand held in place by the covers aboveand below them, respectively, with theview of allowing their free expansionand
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