A piston valve is a device used to control the motion of a fluid or gas along a tube or pipe by means of the linear motion of a piston within a chamber...

Piston valves are one form of valve used to control the flow of steam within a steam engine or locomotive. They control the admission of steam into the...

Stölzel valve, the air enters through the bottom of the valve casing, up through the hollow bottom end of the piston, and through a port to the valve loop...

In a piston engine, the valve timing is the precise timing of the opening and closing of the valves. In an internal combustion engine those are usually...

heat away from the hot valve head to the stem where it may be conducted to the cylinder head. Common in second world war piston engines, now only found...

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...

crankshaft to the piston for the purpose of compressing or ejecting the fluid in the cylinder. In some engines, the piston also acts as a valve by covering...

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...

slide valves to control the flow of steam into and out of the cylinders. In the 20th century, slide valves were gradually superseded by piston valves, particularly...

the D slide valve but this has been largely superseded by piston valve or poppet valve designs. In steam engines the point in the piston cycle at which...