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March 15th, 2004, 21:37
| #1 |
| Junior Member Join Date: Sep 2002
Posts: 30
|  Gear Q
What exactly is the shuttle valve on the Seminole used for, is it emergency extension?
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March 16th, 2004, 00:35
| #2 |
| Senior Member  Join Date: Apr 2003 Location: Prescott, AZ
Posts: 928
| Re: Gear Q
Man, I should SO know this.  |
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March 16th, 2004, 09:46
| #3 |
| Senior Member  Join Date: Aug 2001 Location: Boulder, CO (anywhere but Fresno)
Posts: 1,495
| Re: Gear Q
If I knew what a "shuttle valve" is, I could answer this.
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March 16th, 2004, 10:13
| #4 |
| Senior Member  Join Date: Oct 2000 Location: Louisville, Kentucky
Posts: 712
| Re: Gear Q
Shuttle valves are used in various systems to provide alternate means of power. They are used in pneumatic and hydraulic systems depending on what you're talking about. Think of them as "flapper" valves. When primary power (pressure) is removed, the "shuttle" or "flapper" valve moves either through hydraulic or pneumatic means to allow alternate pressure to automatically power the system. Many times this action is invisible to the pilot.
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March 16th, 2004, 10:44
| #5 |
| Senior Member Join Date: Aug 2001 Location: Boulder, CO (anywhere but Fresno)
Posts: 1,495
| Re: Gear Q
Okay. In looking at my Seminole schematics, no, the shuttle valve is not used for emergency extension. It is used to reverse the flow of the hydraulic pressure in normal gear operation.
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