Rotary valve engine

Rotary valve engine

This topic has 1 reply, 2 voices, and was last updated 18 June 2025 at 12:25 by John Haine.

Viewing 2 posts - 1 through 2 (of 2 total)

Author

Posts
18 June 2025 at 11:28 #803358
AStroud
Participant
@astroud
Hi all

Here is a clip of my rotary valve steam engine, inspired by the River Queen plans. I made several changes, not least to the rotary valve design as in my mind the published plans only allow partial opening during the cycle.

Andrew

https://youtu.be/gVItba_ImAM
Advert

18 June 2025 at 12:25 #803369
John Haine
Participant
@johnhaine32865
Partial opening during the cycle is probably preferred especially for high speed running as it admits a burst of steam into the cylinder which is then allowed to expand doing work. Reduces steam consumption. Engines often have variable cutoff valve gear to optimise efficiency over a wide range of speeds.
Author

Posts

Viewing 2 posts - 1 through 2 (of 2 total)

Please log in to reply to this topic. Registering is free and easy using the links on the menu at the top of this page.

Code of Conduct

Latest Replies

Viewing 25 topics - 1 through 25 (of 25 total)

- Topic
- Voices
- Posts
- Last Post
- Help needed to price a Myford lathe going for sale
  Started by: Mick Durkin in: Help and Assistance! (Offered or Wanted)
- 10
- 14
- 20 June 2025 at 17:50
  Adrian R2
- Miniature Boring bits
  Started by: Vic in: Workshop Tools and Tooling
- 1
- 1
- 20 June 2025 at 17:48
  Vic
- Help Please: IT Not Engineering
  Started by: Nigel Graham 2 in: The Tea Room
- 7
- 13
- 20 June 2025 at 17:42
  Adrian R2
- Harold Halls Workshop Projects book?
  Started by: Bo’sun in: Workshop Techniques
- 6
- 7
- 20 June 2025 at 16:49
  Graham Meek
- Milling in the lathe – Vertical slide 1 2
  Started by: Chris12 in: Beginners questions
- 11
- 30
- 20 June 2025 at 16:01
  Mick B1
- How to sharpen expanding reamer blades & how to adjust them?
  Started by: Grindstone Cowboy in: Beginners questions
- 5
- 5
- 20 June 2025 at 15:54
  JasonB
- ER25 Collet holder @ 2MT w/ 3/8″ BSW drawbar?
  Started by: William Ayerst in: Workshop Tools and Tooling
- 13
- 18
- 20 June 2025 at 15:48
  JasonB
- Rod Sproson – Contact Details
  Started by: Neil Wyatt in: Help and Assistance! (Offered or Wanted)
- 1
- 1
- 20 June 2025 at 14:38
  Neil Wyatt
- The Perpetual Demise of the Model engineer
  Started by: Luker in: Model engineering club news
- 10
- 12
- 20 June 2025 at 14:01
  Michael Gilligan
- What Did You Do Today 2025 1 2 … 6 7
  Started by: JasonB in: The Tea Room
- 32
- 154
- 20 June 2025 at 13:09
  Bazyle
- A new benchmark for cheap tat ?
  Started by: Michael Gilligan in: The Tea Room
- 4
- 10
- 20 June 2025 at 12:50
  Howard Lewis
- First cuts with the lathe 1 2
  Started by: Chris12 in: Beginners questions
- 19
- 39
- 20 June 2025 at 12:05
  Howard Lewis
- Pulley taper – Herbert B drill
  Started by: gerry madden in: Manual machine tools
- 6
- 12
- 20 June 2025 at 11:33
  gerry madden
- Anybody with a Meddings Driltru bench drill or similar?
  Started by: Craig Brown in: Manual machine tools
- 4
- 6
- 20 June 2025 at 11:11
  Craig Brown
- Unimat 3 – loose feed screw
  Started by: msrt7mcfl7 in: Workshop Tools and Tooling
- 3
- 6
- 20 June 2025 at 11:04
  Graham Meek
- Digital Leadscrew Lathes
  Started by: Chris Taylor 3 in: General Questions
- 3
- 7
- 20 June 2025 at 10:34
  lukeama123
- Building Bernard Tekippe’s Precision Regulator 1 2 … 5 6
  Started by: Chris Raynerd 2 in: Clocks and Scientific Instruments
- 14
- 146
- 20 June 2025 at 09:01
  Dave S
- Bench vice 1 2
  Started by: Chris12 in: Workshop Tools and Tooling
- 20
- 30
- 20 June 2025 at 07:19
  Chris12
- Finding Unified rivnuts
  Started by: old mart in: Help and Assistance! (Offered or Wanted)
- 6
- 12
- 19 June 2025 at 23:27
  Nigel Graham 2
- Setting the top slide to turn a Morse taper
  Started by: John Purdy in: Workshop Tools and Tooling
- 14
- 16
- 19 June 2025 at 21:33
  Hollowpoint
- Is there an alternative to tufnol strip for springing
  Started by: steve2250 in: Beginners questions
- 7
- 11
- 19 June 2025 at 12:20
  Dave Wootton
- Twin Engineering’s heavy mill/drill quill removal
  Started by: Martin of Wick in: Manual machine tools
- 5
- 6
- 19 June 2025 at 10:14
  Pete
- Unknown Colchester Lathe.
  Started by: Michael Butler 6 in: Workshop Tools and Tooling
- 2
- 2
- 19 June 2025 at 10:02
  bernard towers
- Rotary table question.
  Started by: larry phelan 1 in: Beginners questions
- 7
- 16
- 19 June 2025 at 08:51
  larry phelan 1
- How many spokes do I really need?
  Started by: Fulmen in: Related Hobbies including Vehicle Restoration
- 5
- 11
- 19 June 2025 at 08:20
  Fulmen

Viewing 25 topics - 1 through 25 (of 25 total)

View full reply list.

Latest Issue

July 2025

Buy Latest/Back Issues

Newsletter Sign-up

Latest Replies