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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. [ 1 ] [ 2 ] The gear is sometimes named without the final "s", [ a ] since it was incorrectly patented under that name.
The Walschaerts valve gear on a steam locomotive (a PRR E6s).. 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.
Egide Walschaerts (21 January 1820 – 18 February 1901) was a Belgian mechanical engineer, best known as the inventor of the Walschaerts valve gear used in steam locomotives. He was born in Mechelen, Belgium. In 1838 he was recognised as an excellent modeller, presenting his work at a local exhibition in Mechelen.
Problems often arise in incorporating a Walschaerts valve gear into the design of tank and narrow gauge locomotives because of space limitations. The reversing rod (with its lifting arm), needed to change between forward and reverse running, is therefore mounted at the same level as the pivot of the expansion link.
The Baker valve gear replaces the expansion link of the Walschaerts gear with an assembly of levers and links which produces the same effect of allowing continuous variation valve travel. The remainder of the gear is the same, so that the return crank and combination lever take the same form, although the proportions are usually modified.
He invented inter alia a new type of valve gear for steam locomotives that was to become the most widely used valve gear in the world. Because the Belgian, Egide Walschaerts , invented the same system independently, it is usually called the Walschaerts valve gear outside the German-speaking world.
These engines had a 15 t coupled axle load and were significantly heavier than the T 3. They had a Walschaerts valve gear and a small coal bunker behind the cab. [1] The T 3s of the BLE, taken over in 1938 by the DRG, were given numbers 89 7531–7540.
The first thirteen Class 19B locomotives were delivered with Walschaerts valve gear, but like Class 16DA no. 879 of the same year, no. 1414 was equipped with Caprotti valve gear as an experiment. In January 1943, after thirteen years in service, the Caprotti rotary cam poppet valve gear was removed at the Uitenhage workshops and replaced with ...