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The Hackworth valve gear is a design of
The Hackworth valve gear is a design of valve gear
The valve gear 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 escape, respectively, at the correct points in the cycle. It can also serve as a reversing ...
used to regulate the flow of steam to the pistons in steam engine
A steam engine is a heat engine that performs mechanical work using steam as its working fluid. The steam engine uses the force produced by steam pressure to push a piston back and forth inside a cylinder. This pushing force can be ...
s. 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
A cut-off, battle jacket, battle vest or kutte in heavy metal subcultures, is a type of vest or jacket which originated in the U.S. military, specifically the Army Air Corps, where pilots and other aviation personnel would collect patches or o ...
adjustments are made by moving the link away from the vertical. The valve rod is pivoted to a point on the actuating lever.
History
The gear was patented by John Wesley Hackworth (1820-1891), son ofTimothy Hackworth
Timothy Hackworth (22 December 1786 – 7 July 1850) was an English steam locomotive engineer who lived in Shildon, County Durham, England and was the first locomotive superintendent of the Stockton and Darlington Railway.
Youth and early wor ...
, in 1859.
Klug's valve gear
Hackworth valve gear was a precursor to Klug's valve gear, but it differs from the latter in that the eccentric rod's suspension point moves to-and-fro in a straight line by means of a die block sliding in a slotted guide.See also
* Joy valve gear - a design used extensively on theL&YR
The Lancashire and Yorkshire Railway (L&YR) was a major British railway company before the 1923 Grouping. It was incorporated in 1847 from an amalgamation of several existing railways. It was the third-largest railway system based in northern ...
and LNWR in England, and elsewhere. A preserved example is LNWR G2a Class number 49395.
* Marshall valve gear - a modified Hackworth gear, patented in 1879 by Marshall, Sons & Co.
* Southern valve gear
Southern valve gear was briefly popular on steam locomotives in the United States. It combines elements of the Walschaerts and Baker patterns.
History
Southern valve gear was devised by locomotive designers on the Southern Railway and used on man ...
- Briefly popular in the United States around 1920. It combined elements of the Walschaerts
The Walschaerts valve gear is a type of valve gear used to regulate the flow of steam to the pistons in steam locomotives, invented by Belgian railway engineer Egide Walschaerts in 1844.
The gear is sometimes named without the final "s", since ...
and Baker
A baker is a tradesperson who baking, bakes and sometimes Sales, sells breads and other products made of flour by using an oven or other concentrated heat source. The place where a baker works is called a bakery.
History
Ancient history
Si ...
patterns.
References
{{steam engine configurations Locomotive valve gearValve gear
The valve gear 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 escape, respectively, at the correct points in the cycle. It can also serve as a reversing ...