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1
slide valve and qev airgun
slide valve and qev airgun
::2012/12/10::
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2
Slide Valve
Slide Valve
::2012/04/27::
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3
AHS02 Hand Slide valve
AHS02 Hand Slide valve
::2012/10/02::
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4
horizontal slide valve
horizontal slide valve
::2008/08/23::
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5
Comparison: Trumpet, Slide Trumpet, Valve Trombone, Slide Trombone, Flute & Flugel
Comparison: Trumpet, Slide Trumpet, Valve Trombone, Slide Trombone, Flute & Flugel
::2014/07/09::
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6
Mucon Slide Valve
Mucon Slide Valve
::2012/05/31::
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7
Forest slide valve carrier flame igniton engine .
Forest slide valve carrier flame igniton engine .
::2012/06/15::
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8
10 HP Schleicher Schumm slide valve engine Start up week 2 after slide modification, re-rescraping
10 HP Schleicher Schumm slide valve engine Start up week 2 after slide modification, re-rescraping
::2013/04/28::
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9
Part 38 - PM #3 Steam Engine-Slide Valve
Part 38 - PM #3 Steam Engine-Slide Valve
::2012/03/17::
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10
Double Block & Bleed Parallel Slide Gate Valve
Double Block & Bleed Parallel Slide Gate Valve
::2013/08/23::
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11
Vortex Roller Slide Gate Valve
Vortex Roller Slide Gate Valve
::2013/12/31::
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12
Double Acting Slide Valve Model Steam Engine
Double Acting Slide Valve Model Steam Engine
::2009/03/01::
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13
29-Slide Valve | Steam Engine | ( Catia )
29-Slide Valve | Steam Engine | ( Catia )
::2014/09/07::
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14
Scraping Slide Valve Cover
Scraping Slide Valve Cover
::2013/03/12::
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15
QEV + homemade slide valve.
QEV + homemade slide valve.
::2012/09/13::
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16
TWO CYLINDER SLIDE VALVE STEAM ENGINE CRANKSHAFT: VIDEO #2
TWO CYLINDER SLIDE VALVE STEAM ENGINE CRANKSHAFT: VIDEO #2
::2010/07/29::
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17
Forest Flame Ignition Slide Valve Reproduction Engines Grenning Models 2014
Forest Flame Ignition Slide Valve Reproduction Engines Grenning Models 2014
::2014/09/28::
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18
Hille Motor Schieber Gasmotor slide valve stationary gas engine
Hille Motor Schieber Gasmotor slide valve stationary gas engine
::2013/04/09::
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19
TDSH Slide Valve
TDSH Slide Valve
::2013/05/19::
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20
Maxitrak Slide Valve Setting
Maxitrak Slide Valve Setting
::2012/10/17::
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21
Two Cylinder Slide Valve Steam Engine Crankshaft: Video #1
Two Cylinder Slide Valve Steam Engine Crankshaft: Video #1
::2010/07/27::
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22
Redesigning a vertical slide valve steam engine - Phase Two.
Redesigning a vertical slide valve steam engine - Phase Two.
::2009/10/02::
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23
D-(Slide) Valve on 1870s Planer
D-(Slide) Valve on 1870s Planer
::2007/09/07::
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24
Gas  engine,Crossley Otto, Otto slide valve.
Gas engine,Crossley Otto, Otto slide valve.
::2010/02/14::
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25
Otto Slide Valve 4 cycle carrier flame ignition test engine
Otto Slide Valve 4 cycle carrier flame ignition test engine
::2013/02/09::
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26
Steam tram powering home made slide valve engine
Steam tram powering home made slide valve engine
::2013/06/18::
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27
Superbone ( slide/valve trombone )
Superbone ( slide/valve trombone )
::2007/01/26::
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28
Crossley piano base slide-valve engine
Crossley piano base slide-valve engine
::2014/04/22::
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29
Martini Slide Valve Flame Ignition Engine at 2013 Nuenen
Martini Slide Valve Flame Ignition Engine at 2013 Nuenen
::2013/05/19::
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30
Pentair Slide Valve 261165 263064
Pentair Slide Valve 261165 263064
::2013/03/29::
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31
valterra pvc slide valve
valterra pvc slide valve
::2013/06/13::
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32
10 HP Schleicher Schumm Slide Valve  Start-up April 21st 2013
10 HP Schleicher Schumm Slide Valve Start-up April 21st 2013
::2013/04/22::
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33
Lubricating a Slide Valve
Lubricating a Slide Valve
::2012/06/14::
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34
1889 Schleicher Schumm slide valve Otto 2nd unrestored run
1889 Schleicher Schumm slide valve Otto 2nd unrestored run
::2014/05/18::
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35
The First Test, Valve/Slide trumpet: Naga Phoenix
The First Test, Valve/Slide trumpet: Naga Phoenix
::2011/09/28::
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36
2nd  video of the slide valve flame ignition test engine
2nd video of the slide valve flame ignition test engine
::2013/02/09::
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37
1888 Crossley-Otto Slide Valve Piano Base Engine - Brings $320,000 at Aumann Auctions
1888 Crossley-Otto Slide Valve Piano Base Engine - Brings $320,000 at Aumann Auctions
::2012/12/03::
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38
Trumpet - why you should use the 3rd valve slide
Trumpet - why you should use the 3rd valve slide
::2013/02/12::
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39
Crossley Slide Valve flame ignition engine
Crossley Slide Valve flame ignition engine
::2014/09/21::
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40
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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41
Crossley Piano Base Slide Valve Engine From Anson displayed at the 2013 Nuenen Rally
Crossley Piano Base Slide Valve Engine From Anson displayed at the 2013 Nuenen Rally
::2013/05/22::
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42
CSH Screw Compressor - Slider Valve
CSH Screw Compressor - Slider Valve
::2011/08/26::
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43
Cast iron slide valve backing plate floating on air cushon after being properly hand scraped
Cast iron slide valve backing plate floating on air cushon after being properly hand scraped
::2013/07/30::
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44
First Start - 8Hp Schleicher Schumm Slide Valve Otto
First Start - 8Hp Schleicher Schumm Slide Valve Otto
::2009/07/03::
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45
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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46
Otto,Slide Valve,Stationärmotor,Stationary engine, Deutz A,Stationaire Motor,Moteur fixe
Otto,Slide Valve,Stationärmotor,Stationary engine, Deutz A,Stationaire Motor,Moteur fixe
::2013/08/11::
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47
Warchalowski,Stationärmotor,stationary engine,slide valve,Schiebermotor
Warchalowski,Stationärmotor,stationary engine,slide valve,Schiebermotor
::2014/10/12::
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48
8 HP 1889 Schleicher Schumm Slide Valve Start up Sn 3211
8 HP 1889 Schleicher Schumm Slide Valve Start up Sn 3211
::2014/05/25::
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49
Crossley,look around,slide valve,stationary engine,Stationärmotor,Gasmotor,Standmotor
Crossley,look around,slide valve,stationary engine,Stationärmotor,Gasmotor,Standmotor
::2014/10/26::
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50
Crossley,Start,slide valve,stationary engine,Gasmotor,Stationärmotor,Standmotor
Crossley,Start,slide valve,stationary engine,Gasmotor,Stationärmotor,Standmotor
::2014/10/26::
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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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