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AHS02 Hand Slide valve
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slide valve and qev airgun
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Lake Side Farm Auction -1888 Crossley-Otto Slide Valve Piano Base 2hp - Aumann Auctions Inc.
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Redesigning a vertical slide valve steam engine - Phase Two.
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CGI 3D Slide Valve Animation for 1883 10 Hp Schleicher Schumm Flame Ignition Engine
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Film 2 of 2 Twin Cylinder 4 HP Deutz slide valve Special Dynamo service start up
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1884 10 HP Schleicher Schumm Slide Valve port verification
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38
1888 Crossley-Otto Slide Valve Piano Base 2 HP @ Lake Side Farms Auction
1888 Crossley-Otto Slide Valve Piano Base 2 HP @ Lake Side Farms Auction
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1884 10 HP Schleicher Slide Valve - Restoration Complete -  Test Run at 75 RPM
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Quick slide valve demonstration
Quick slide valve demonstration
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41
G7 paintball remote line with slider valve demo
G7 paintball remote line with slider valve demo
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42
Crossley piano base slide-valve engine
Crossley piano base slide-valve engine
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2nd  video of the slide valve flame ignition test engine
2nd video of the slide valve flame ignition test engine
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44
Machining flywheels in place on a 1884 Slide Valve Otto
Machining flywheels in place on a 1884 Slide Valve Otto
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45
Otto,Slide Valve,Stationärmotor,Stationary engine, Deutz A,Stationaire Motor,Moteur fixe
Otto,Slide Valve,Stationärmotor,Stationary engine, Deutz A,Stationaire Motor,Moteur fixe
::2013/08/12::
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46
Slide Valve Engine Rare 2 Cylinder under Load
Slide Valve Engine Rare 2 Cylinder under Load
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47
Perin Panhard slide valve gas engine
Perin Panhard slide valve gas engine
::2012/09/15::
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48
Demonstration of Slow Speed operation  1883 Flame Ignition Forest Slide Valve  Reproduction Engine
Demonstration of Slow Speed operation 1883 Flame Ignition Forest Slide Valve Reproduction Engine
::2012/04/08::
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49
Fantastic Scale model of a Deutz slide valve with working flame ignition
Fantastic Scale model of a Deutz slide valve with working flame ignition
::2013/05/20::
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50
Film 1 of 2 Twin Cylinder 4 HP Deutz slide valve Special Dynamo service
Film 1 of 2 Twin Cylinder 4 HP Deutz slide valve Special Dynamo service
::2013/05/22::
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RESULTS [51 .. 101]
From Wikipedia, the free encyclopedia
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Cylinder, with slide valve removed to show ports
A double-acting slide valve cylinder.
Steam enters via the steam port SP, and is admitted by the slide valve SV  through the upper passage S  to push down the piston P. At the same time, exhaust steam from below the piston passes back up the lower passage S, via the valve cavity, to exhaust E. As the piston descends, the valve moves upwards to admit steam below the piston and release exhaust from above.

The slide valve is a rectilinear valve used to control the admission of steam into, and emission of exhaust from, the cylinder of a steam engine.

The image description page explains how this SVG animation can be viewed

Use[edit]

In the 19th century, most steam locomotives used 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 in engines using superheated steam. There were two reasons for this:

  • With piston valves, the steam passages can be made shorter. This reduces resistance to the flow of steam and improves efficiency.
  • It is difficult to lubricate slide valves adequately in the presence of superheated steam.

Murdoch's D slide valve[edit]

Murdoch's long D slide valve

The D slide valve, or more specifically Long D slide valve, is a form of slide valve, invented by William Murdoch and patented in 1799. It is named after the hollow central D-sectioned piston.

This valve worked by "connecting the upper and lower valves so as to be worked by one rod or spindle, and in making the stem or tube which connects them hollow, so as to serve for an induction pipe to the upper end of the cylinder." This allowed two valves to do the work of four.

The above description (referring to upper and lower valves) clearly relates to an engine with a vertical cylinder, such as a beam engine. Where the cylinders are horizontal, as in a steam locomotive, the valves would be side-by-side.

Balanced slide valve[edit]

The balanced slide valve was invented by the Scottish engineer Alexander Allan. It was not much used in the UK but, at one time, had great popularity in the USA. It gave some of the advantages of a piston valve to a slide valve by relieving the pressure on the back of the valve, thus reducing friction and wear.

See also[edit]

External links[edit]

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