poppet valve technical
mushroom valve

In the early days of engine building, the poppet valve was a major problem.

The change to poppet valves beginning with the Fifteen of 1933.

Poppet valves are easy to replace and require little maintenance.

The Class 15E was therefore built with poppet valve gear.

Double-beat poppet valves became widely used during the nineteenth century.

Their design is based on the common electro-pneumatic poppet valve design.

These have a stacked-tube construction, built around a poppet valve, that is opened when struck by a force.

If the engine uses the common form of overhead poppet valves, these would also be difficult to fit inside the limited space.

But for most uses, he said, poppet valves perform acceptably at a reasonable cost.

This loss is unavoidable on intake ports due to the nature of the poppet valve.

The valve core is a poppet valve assisted by a spring.

In one late 1920s paper he claimed that the 1 hp/in3 goal was impossible to achieve with poppet valve type engines.

Each cylinder bank had a single overhead cam powering the poppet valves.

The engines had poppet valves and reversing was by sliding camshaft.

Advanced valve gear This was usually poppet valves driven by camshafts.

Use of poppet valves also increased the speed because they gave very accurate steam delivery to the cylinders.

The engine was a vertical one with horizontal, opposed poppet valves for inlet and exhaust.

The sidevalve's poppet valves are usually sited on one side of the cylinder(s).

Poppet valves date from at least the 1770s, when James Watt used them on his beam engines.

The valves like other poppet valve Daimlers had exceptionally wide clearances.

The rocket is fired when the computer sends direct current through a small electromagnet that opens the poppet valve.

Poppet valve applications are listed in .

The lobes on the camshafts operate cam followers which in turn open the poppet valves.

The main advantage of the poppet valve is that it has no movement on the seat, thus requiring no lubrication.

Sickels patented a valve gear for double-beat poppet valves in 1842.

Exhalation occurs through a rubber one-way mushroom valve in the chamber of the demand valve, directly into the water quite close to the diver's mouth.

A poppet valve (also called mushroom valve) is a valve typically used to control the timing and quantity of gas or vapour flow into an engine.

"Suffice it to say that mushroom valves, springs and cams, and many small parts, are swept away bodily, that we have an almost perfectly spherical explosion chamber, and a cast-iron sleeve or tube as that portion of the combustion chamber in which the piston travels."