Answers.Body: <blockquote>
    <p>I tried many designs I found</p>
  </blockquote>
  
  <p>A quick Google search resulted in the following designs. Have you tried them all?</p>
  
  <p><a href="http://sariel.pl/2008/12/pneumatic-autovalve/" rel="nofollow noreferrer">Sariel's Autovalve</a>:<a href="https://i.sstatic.net/WquD0.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/WquD0.jpg" alt="enter image description here"></a></p>
  
  <p><a href="https://www.youtube.com/watch?v=gaBe3SZ3FEA" rel="nofollow noreferrer">Philo's pneumatic valve</a>:</p>
  
  <p><a href="https://i.sstatic.net/GgrOG.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/GgrOG.jpg" alt="enter image description here"></a></p>
  
  <p><a href="http://sariel.pl/2016/06/liebherr-r974-pneumatic-excavator/" rel="nofollow noreferrer">Sariel's Servo Valve</a>:<a href="https://i.sstatic.net/1tigO.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/1tigO.jpg" alt="enter image description here"></a></p>
  
  <p><a href="https://www.eurobricks.com/forum/index.php?/forums/topic/87307-small-autovalve/" rel="nofollow noreferrer">Tamas Juhasz's small autovalve with compressor</a>:<a href="https://i.sstatic.net/xh6cL.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/xh6cL.jpg" alt="enter image description here"></a></p>
  
  <p><a href="https://rebrickable.com/mocs/MOC-4730/Technic-Dragon/lego-technic-compact-pneumatic-autovalve/" rel="nofollow noreferrer">Technic-Dragon's Compact Pneumatic Autovalve</a>:<a href="https://i.sstatic.net/NTfqb.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/NTfqb.jpg" alt="enter image description here"></a></p>
  
  <hr>
  
  <p>Bonus entries, not using exclusively PF motors, but could be adapted to:</p>
  
  <p><a href="http://www.brickshelf.com/cgi-bin/gallery.cgi?f=299371" rel="nofollow noreferrer">Conchas' Micromotor valve</a>:</p>
  
  <p><a href="https://i.sstatic.net/0NiTE.gif" rel="nofollow noreferrer"><img src="https://i.sstatic.net/0NiTE.gif" alt="enter image description here"></a></p>
  
  <p><a href="https://brickset.com/sets/8868-1/Air-Tech-Claw-Rig" rel="nofollow noreferrer">Pneumatically controlled valve from the B model of 8868-1: Air Tech Claw Rig</a><a href="https://i.sstatic.net/zNW74.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/zNW74.jpg" alt="enter image description here"></a></p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-01-30T14:12:35.423Z
Answers.Text: I have my doubts about a couple of these designs. When under pressure, the valve switch takes quite a bit of force to turn. I think a couple of these designs don't have sufficient gearing down to work unless there's no significant pressure yet.
Answers.UserDisplayName: Michael Verschaeve
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-01-30T14:14:56.947Z
Answers.Text: @MichaelVerschaeve I haven't tried any of them personally (except for the 8868), but provided links to their respective websites and forum threads, where comments might be left to indicate such problems and their solutions.
Answers.UserDisplayName: zovits
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-02-03T20:37:42.860Z
Answers.Text: @MichaelVerschaeve The first Sariel autovalve is not super reliable - in my experience, the small liftarms can get stuck in certain positions. The servo valves definitely have more than enough torque. The micromotor valve is definitely questionable, not to mention that it requires a sensor and probably takes 5-10 seconds to flip state. Pneumatic autovalves are pretty common in air-powered creations.
Answers.UserDisplayName: MindS1
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-01-30T07:34:44.000Z
Answers.LastActivityDate: 2020-01-30T07:34:44.000Z
Answers.UserDisplayName: zovits
Body: <p>I am working on a project that requires remotely switched LEGO valves, and I tried many designs I found, and none of them worked due to the valve causing too much resistance. Does anyone have a remotely switched valve design that fulfills the conditions below?</p>
  
  <ol>
  <li>It must be tested and work.</li>
  <li>It must use only PF motors.</li>
  <li>It must not use <a href="https://www.bricklink.com/v2/catalog/catalogitem.page?P=32449#T=C" rel="nofollow noreferrer">32449</a>.</li>
  </ol>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2020-01-30T06:43:01.460Z
Comments.Text: Why the ban on 32449 (thin liftarm length 4) ?
Comments.UserDisplayName: Michael Verschaeve
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2020-01-30T15:19:25.657Z
Comments.Text: @MichaelVerschaeve Because I do not have it and don't want to wait for one to be shipped.
Comments.UserDisplayName: technicguy1
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2020-01-30T15:58:24.240Z
Comments.Text: I just think that your question would be more relevant to others without this restriction, see point 4 of https://meta.stackexchange.com/help/how-to-ask. Also, even if a presented design contained the forbidden element, you surely can replace it with an alternative element ?
Comments.UserDisplayName: Michael Verschaeve
Tags: <technic><design><pneumatic>
Title: How to motorize a LEGO Pneumatic valve?
UserDisplayName: technicguy1
ThreadText: # How to motorize a LEGO Pneumatic valve?
  
  (Asked by: username_0 on 2020-01-29)
  
  I am working on a project that requires remotely switched LEGO valves, and I tried many designs I found, and none of them worked due to the valve causing too much resistance. Does anyone have a remotely switched valve design that fulfills the conditions below?
  
  1. It must be tested and work.
  2. It must use only PF motors.
  3. It must not use [32449](https://www.bricklink.com/v2/catalog/catalogitem.page?P=32449#T=C).
  
  **Tags:** technic, design, pneumatic
  > **Comments:**
  > **username_1**: Why the ban on 32449 (thin liftarm length 4) ?  
  > **username_0**: @MichaelVerschaeve Because I do not have it and don't want to wait for one to be shipped.  
  > **username_1**: I just think that your question would be more relevant to others without this restriction, see point 4 of https://meta.stackexchange.com/help/how-to-ask. Also, even if a presented design contained the forbidden element, you surely can replace it with an alternative element ?  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_2 on 2020-01-30. Score: 4 | Accepted answer
  
  > I tried many designs I found
  
  A quick Google search resulted in the following designs. Have you tried them all?
  
  [Sariel's Autovalve](http://sariel.pl/2008/12/pneumatic-autovalve/):[![enter image description here](https://i.sstatic.net/WquD0.jpg)](https://i.sstatic.net/WquD0.jpg)
  
  [Philo's pneumatic valve](https://www.youtube.com/watch?v=gaBe3SZ3FEA):
  
  [![enter image description here](https://i.sstatic.net/GgrOG.jpg)](https://i.sstatic.net/GgrOG.jpg)
  
  [Sariel's Servo Valve](http://sariel.pl/2016/06/liebherr-r974-pneumatic-excavator/):[![enter image description here](https://i.sstatic.net/1tigO.jpg)](https://i.sstatic.net/1tigO.jpg)
  
  [Tamas Juhasz's small autovalve with compressor](https://www.eurobricks.com/forum/index.php?/forums/topic/87307-small-autovalve/):[![enter image description here](https://i.sstatic.net/xh6cL.jpg)](https://i.sstatic.net/xh6cL.jpg)
  
  [Technic-Dragon's Compact Pneumatic Autovalve](https://rebrickable.com/mocs/MOC-4730/Technic-Dragon/lego-technic-compact-pneumatic-autovalve/):[![enter image description here](https://i.sstatic.net/NTfqb.jpg)](https://i.sstatic.net/NTfqb.jpg)
  
  ---
  
  Bonus entries, not using exclusively PF motors, but could be adapted to:
  
  [Conchas' Micromotor valve](http://www.brickshelf.com/cgi-bin/gallery.cgi?f=299371):
  
  [![enter image description here](https://i.sstatic.net/0NiTE.gif)](https://i.sstatic.net/0NiTE.gif)
  
  [Pneumatically controlled valve from the B model of 8868-1: Air Tech Claw Rig](https://brickset.com/sets/8868-1/Air-Tech-Claw-Rig)[![enter image description here](https://i.sstatic.net/zNW74.jpg)](https://i.sstatic.net/zNW74.jpg)
  
  > **Comments:**
  > **username_1**: I have my doubts about a couple of these designs. When under pressure, the valve switch takes quite a bit of force to turn. I think a couple of these designs don't have sufficient gearing down to work unless there's no significant pressure yet.  
  > **username_2**: @MichaelVerschaeve I haven't tried any of them personally (except for the 8868), but provided links to their respective websites and forum threads, where comments might be left to indicate such problems and their solutions.  
  > **username_3**: @MichaelVerschaeve The first Sariel autovalve is not super reliable - in my experience, the small liftarms can get stuck in certain positions. The servo valves definitely have more than enough torque. The micromotor valve is definitely questionable, not to mention that it requires a sensor and probably takes 5-10 seconds to flip state. Pneumatic autovalves are pretty common in air-powered creations.  
  
  ---
  
  