Hackworth valve gear on steam locomotive 'Lydia' at the Perrygrove Railway.Hackworth valve gear on Apedale Valley Light Railway locomotive 'Stanhope'Hackworth valve gear on Tal-y-Llyn Railway locomotive 'Edward Thomas'
The Hackworth valve gear is a design of valve gear used to regulate the flow of steam to the pistons in steam engines. It is a radial gear, with an actuating lever driven from the crank. The drive may be taken directly from the crank or indirectly via a return crank (as in all pictures). The other end of the actuating lever is attached to a die block which slides in a slotted link. When the link is vertical, the engine is in mid-gear. Forward, reverse and cut-off adjustments are made by moving the link away from the vertical. The valve rod is pivoted to a point on the actuating lever.[1]
^"What is HACKWORTH VALVE GEAR?". Retrieved 15 February 2014.
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The Hackworthvalvegear is a design of valvegear used to regulate the flow of steam to the pistons in steam engines. It is a radial gear, with an actuating...
The valvegear of a steam engine is the mechanism that operates the inlet and exhaust valves to admit steam into the cylinder and allow exhaust steam to...
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invention of Timothy Hackworth on his Royal George of 1828. Owing to the limited metallurgy of the period, Hackworth's first spring valves used an accordion-like...
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compared to the slide valve, which typically used 10% of an engine's power. Corliss used automatic variable cut off. The valvegear controlled engine speed...
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available. A similar problem affected safety valves, causing them to rely on dead weights or Hackworth's bulky stack of leaf springs, rather than the...
Clayton incorporated several improvements, notably to the steam circuit and valvegear. The new locomotives were built over several batches at Eastleigh Works...
elongated oval. The classic exhaust design for a steam locomotive began with Hackworth's invention of the blastpipe, placed centrally within a tall chimney. Victorian...
Blackett, Hedley would have been familiar with Trevithick's engine. Timothy Hackworth's 0-6-0 Royal George of 1827 also used a return-flued boiler, although...
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being built, but he was permitted to act as consultant. The Stephenson valvegear was developed in 1842 by Stephenson employees in Newcastle. The six-coupled...
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tapered boilers, long smokeboxes, boiler top feeds, long-lap long-travel valvegear, and many standardised parts such as wheels, cylinders and connecting...
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