valve spindle

In practice the valve spindle length is adjusted to ensure this as part of setting the timing.

The support plates fixed to the valve spindle also have a piston ring.

Once again, the gabs were driven by the eccentrics and the pin drove the valve spindle.

One set of valve gear drove each pair of valve spindles.

By the time he located the correct handwheel, the valve spindle had been bent by the force of the flooding water.

The differential lever is connected at both the ends to the governor sleeve and the throttle valve spindle respectively.

Articulated valve spindles.

The valve spindle continues to move backwards and forwards with the support plates attached to it, without disturbing the valve heads.

As the relay piston moves the throttle valve spindle attached to it also descends and partially closes the valve.

A contributing problem was also that any elongation of the outside valve spindles was multiplied by the conjugated valve gear.

X-gabs were also usually reversed, so that the gab was placed on the valve spindle and the pins were instead connected to the eccentric rods.

The relay piston moves upwards and the throttle valve spindle ascend upwards opening the valve.

The middle cylinder was driven from the combination lever assembly that controlled the fore and aft movement of the valve spindle on the right-hand "outside" cylinder.

In fact, the rotary valves used for the locomotive were entirely different to the Willans' characteristic central valve spindle, even though they did both use single-acting trunk pistons.

The vertical movement is translated into the horizontal movement required by the valve spindle by a die block moving in a slide which can be varied in inclination.

The simplest form of gab valve gear or 'gab clutch' was a simple notch in the valve rod, where it hooked over the valve spindle.

The Trofimoff valve comprises the valve spindle, the piston valve heads slotted onto them and the two supporting plates (Stützplatten).

Deflection occurs in the lever and due to this the pilot valve spindle raises up opening the upper port for oil entry and lower port for oil exit.

The valve consists of the usual parts of a piston valve: two valve pistons with sealing rings, carried on a valve spindle driven by the valve gear.

The hollow piston valves were mounted on the same valve spindle in a common steam chest, with the high pressure valves arranged for inside admission and the low pressure valves for outside admission.

This was achieved by using the combination lever assembly that controlled the fore and aft movement of the valve spindle, which admitted "live" steam into the cylinder and ejected "spent" steam through the ports.

Gooch valve gear had the disadvantage of angularity between the valve spindle and the eccentric rod in full gear, whereas the best forms of the Stephenson gear, the thrust was in a straight line.

Outside admission gives a shorter exhaust passage, with the consequent advantages of a lower back pressure and sharper blast, but with the disadvantage that the valve spindle glands must be made to withstand much higher pressures and temperatures.

Holcroft continued to develop this mechanism by driving the "middle" cylinder of a steam locomotive from the combination levers of an "outside" cylinder, as opposed to Gresley's method of using direct transmission from the valve spindle.

The Holcroft variant held an advantage over Gresley's "conjugated" design, as the valve timing was immune to variations brought about by heat expansion of the valve spindles and flexing of the conjugation assembly when under heavy use.