What is sleeve valve?

Sleeve Valve

The sleeve valve is a type of valve mechanism for piston engines, distinct from the usual poppet valve. Sleeve-valve engines saw use in a number of pre-World War II luxury cars and in USA in the Willys-Knight car and light truck. They subsequently fell from use due to advances in poppet-valve technology, including sodium cooling, and a sleeve-based engine's tendency to burn a lot of lubricating oil or to seize due to lack of it. The Scottish Argyll company used its own, much simpler and efficient, single-sleeve system in its cars, a system which, after extensive development, saw substantial use in British aircraft engines of the 1940s, such as the Napier Sabre and Bristol Hercules and Centaurus, only to be supplanted by the jet engine.

Read more about Sleeve Valve.

Some articles on sleeve valve:

Sleeve Valve - Steam Engine
... Sleeve valves have occasionally been used on steam engines, for example the SR Leader class. ...
Willys-Knight
... The Willys-Knight employed a Knight sleeve valve engine, generally four- and six-cylinder models ... Willys-Knight introduced a sleeve-valve V8 in 1917, which was sold until 1919 ... Willys also purchased Stearns-Knight of Cleveland, Ohio, which also used a sleeve valve Knight Engine, making that marque the crown jewel in his growing automotive empire ...
Arrol-Johnston - History - Arrol-Aster
... Both the latter were given Burt-McCollum single sleeve valve engines in the interests of silence, but the 21/60 hp Aster was also available in its original ohv form ... completely new Arrol-Aster was the 2.5-litre 6-cylinder 17/50 hp with sleeve valves ... It had a 3.3-litre sleeve valve engine consisting of the 17/50 unit with two extra cylinders and was available in supercharged form ...
Bristol Hydra - Design and Development
... It appears the Hydra was built as a "backup" design in case the newer sleeve valve engines being designed by Roy Fedden at the same time proved unworkable ... The Hydra had only two valves per cylinder instead of three or four, limiting volumetric efficiency ... difficult to properly arrange pushrods for four valve operation in a multi-row radial engine, some of the rods would have to exit the crankcase between the cylinders where there is little room or spare ...
Napier Sabre - Design and Development - Genesis
... In 1927, Harry Ricardo published a study on the concept of the sleeve valve engine ... In it, he stated traditional poppet valve engines would likely have a hard time producing much more than 1,500 hp (1,100 kW), a figure that many companies were eyeing for next generation engines ... In order to pass this limit, the sleeve valve would have to be used in order to increase volumetric efficiency, as well as to decrease the engine's sensitivity to detonation ...