Quick Dump Valve - Revision history

Technician1002: /* The Quick Dump Valve */

2010-12-18T01:24:26Z

The Quick Dump Valve

← Older revision		Revision as of 20:24, 17 December 2010
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	[http://www.youtube.com/watch?v=9Klxqav_6NM Quick Reload T Shirt launcher]		[http://www.youtube.com/watch?v=9Klxqav_6NM Quick Reload T Shirt launcher]

	Quick Dump valves can be constructed as either a coaxial design with the valve inside a chamber, or built inside a T for an external valve. Coaxial valves provide some of the best ~~COF~~ values possible.		Quick Dump valves can be constructed as either a coaxial design with the valve inside a chamber, or built inside a T for an external valve. Coaxial valves provide some of the best CV values possible.

	[[Image:WikiOverview.jpg]]		[[Image:WikiOverview.jpg]]

Boilingleadbath: + cross section

2009-08-27T23:10:38Z

+ cross section

← Older revision		Revision as of 18:10, 27 August 2009
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	== The Quick Dump Valve ==		== The Quick Dump Valve ==
			[[Image:Wtooliepiston.png\|frame\|Toolie-style piston valve; A is barrel, B is sealing face, C is chamber, D is drive rod, E is piston, F is pilot volume, G is pilot valve.]]
	The quick dump valve is a variation on a traditional barrel sealer piston valve. In the section on piston valves, various configurations are covered and the advantages and disadvantages of each. A quick dump valve may be used where the traditional valves shortcomings cause problems for the builder. It was noted in the piston valve section in the wiki that as a barrel sealer valve nears a 1:1 ratio, the pilot pressure needed to open the valve drops lower, and when they pop open, they do so with more force and speed. They become temperamental as the ratio approaches a 1:1 ratio as the force to start opening the valve drops. They tend to stick or are unable to vent the pilot low enough to fire it. As a result, piston valves that won't fire are a common problem.		The quick dump valve is a variation on a traditional barrel sealer piston valve. In the section on piston valves, various configurations are covered and the advantages and disadvantages of each. A quick dump valve may be used where the traditional valves shortcomings cause problems for the builder. It was noted in the piston valve section in the wiki that as a barrel sealer valve nears a 1:1 ratio, the pilot pressure needed to open the valve drops lower, and when they pop open, they do so with more force and speed. They become temperamental as the ratio approaches a 1:1 ratio as the force to start opening the valve drops. They tend to stick or are unable to vent the pilot low enough to fire it. As a result, piston valves that won't fire are a common problem.

Technician1002: /* The Quick Dump Valve */

2009-08-18T10:14:48Z

The Quick Dump Valve

← Older revision		Revision as of 05:14, 18 August 2009
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	[http://www.youtube.com/watch?v=9Klxqav_6NM Quick Reload T Shirt launcher]		[http://www.youtube.com/watch?v=9Klxqav_6NM Quick Reload T Shirt launcher]

	Quick Dump valves can be constructed as either a coaxial design with the valve inside a chamber, or built inside a T for an external valve. ~~I prefer the coaxial designs myself for~~ the best COF values possible.		Quick Dump valves can be constructed as either a coaxial design with the valve inside a chamber, or built inside a T for an external valve. Coaxial valves provide some of the best COF values possible.

	[[Image:WikiOverview.jpg]]		[[Image:WikiOverview.jpg]]

Technician1002: /* The Quick Dump Valve */

2009-08-10T21:17:35Z

The Quick Dump Valve

← Older revision		Revision as of 16:17, 10 August 2009
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	Unlike a piston valve that uses pressure in a "Pilot" area to hold the valve closed, the QDV has no pressure on the pilot area of the piston to hold it closed. In this manner it is much like a spool control valve.		Unlike a piston valve that uses pressure in a "Pilot" area to hold the valve closed, the QDV has no pressure on the pilot area of the piston to hold it closed. In this manner it is much like a spool control valve.

	A video on the valve theory is posted here; [http://www.youtube.com/watch?v=No3nI07mlQo The Quick Dump Valve]		A video on the valve theory is posted here; [http://www.youtube.com/watch?v=No3nI07mlQo Youtube The Quick Dump Valve]

	The first appearance of the Quick Dump Valve in an air cannon is covered in a contest for building t shirt launchers;		The first appearance of the Quick Dump Valve in an air cannon is covered in a contest for building t shirt launchers;

Technician1002: /* The Quick Dump Valve */

2009-08-06T22:55:00Z

The Quick Dump Valve

← Older revision		Revision as of 17:55, 6 August 2009
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	A video on the valve theory is posted here; [http://www.youtube.com/watch?v=No3nI07mlQo The Quick Dump Valve]		A video on the valve theory is posted here; [http://www.youtube.com/watch?v=No3nI07mlQo The Quick Dump Valve]

	The ~~official contest where~~ the ~~design was posted~~ is ~~here~~;		The first appearance of the Quick Dump Valve in an air cannon is covered in a contest for building t shirt launchers;
	[http://inteltrailblazerschallenge.wikispaces.com/The+brag+zone IntelTrailBlazers Engineering Challenge]		[http://inteltrailblazerschallenge.wikispaces.com/The+brag+zone IntelTrailBlazers Engineering Challenge]

	The first mention of the valve on Spudfiles is in this thread~~. One of the members noticed the contest page before I joined Spudfiles and posted the valve~~.		The first mention of the valve on Spudfiles is in this thread.
	[http://www.spudfiles.com/forums/interesting-new-valve-design-t17617.html Interesting New Valve Design]		[http://www.spudfiles.com/forums/interesting-new-valve-design-t17617.html Interesting New Valve Design]

	This is a video of the T Shirt launcher in action. ~~They~~ won the competition with ~~the~~ design.		This is a video of the T Shirt launcher in action. The team won the competition with this design.
	[http://www.youtube.com/watch?v=9Klxqav_6NM Quick Reload T Shirt launcher]		[http://www.youtube.com/watch?v=9Klxqav_6NM Quick Reload T Shirt launcher]

	Quick Dump valves can be constructed as either a coaxial design with the valve inside a chamber, or built inside a T for an external valve. I prefer the coaxial designs myself for the best COF values possible.		Quick Dump valves can be constructed as either a coaxial design with the valve inside a chamber, or built inside a T for an external valve. I prefer the coaxial designs myself for the best COF values possible.

	There are several QDV cannons on Spudfiles to show some options in building them. The oldest known Quick Dump Valve spudgun is shown below. It is made from non pressure rated cellular core ABS DWV pipe to test the properties of the pipe in air cannon applications. This cannon is still functional in 2009.


	[[Image:WikiOverview.jpg]]		[[Image:WikiOverview.jpg]]

Ragnarok at 00:32, 30 July 2009

2009-07-30T00:32:58Z

← Older revision		Revision as of 19:32, 29 July 2009
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			<i><font size=3>'''Article Flag'''</font><br>
			As an article relating to spudding hardware, this should be presented in a more neutral format - it currently reads like an advertisement.<br>
			It should also be presented in a third person point of view, as newcomers won't be able to associate "I" or "Me" usefully.</i><br>
			Flagged by [[User:Ragnarok\|Ragnarok]] 20:32, 29 July 2009 (EDT)


	== The Quick Dump Valve ==		== The Quick Dump Valve ==

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	A QDV when closed has the appearance of a spool valve. The air source under pressure is sealed off in the chamber with an o ring on both sides of the port. What makes this different than a typical spool valve is when it is opened, the supply pressure is then applied to the end of the spool. This pressure provides a positive feedback to the spool so as it opens, the force opening it rapidly increases as supply pressure in the outlet port pushes on the piston.		A QDV when closed has the appearance of a spool valve. The air source under pressure is sealed off in the chamber with an o ring on both sides of the port. What makes this different than a typical spool valve is when it is opened, the supply pressure is then applied to the end of the spool. This pressure provides a positive feedback to the spool so as it opens, the force opening it rapidly increases as supply pressure in the outlet port pushes on the piston.

	Unlike a piston valve that uses pressure in a "Pilot" area to hold the valve closed, the QDV has no pressure on the pilot area of the piston to hold it closed. In this ~~manor~~ it is much like a spool control valve.		Unlike a piston valve that uses pressure in a "Pilot" area to hold the valve closed, the QDV has no pressure on the pilot area of the piston to hold it closed. In this manner it is much like a spool control valve.

	A video on the valve theory is posted here; [http://www.youtube.com/watch?v=No3nI07mlQo The Quick Dump Valve]		A video on the valve theory is posted here; [http://www.youtube.com/watch?v=No3nI07mlQo The Quick Dump Valve]
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	[[Image:Split1a.JPG]]		[[Image:Split1a.JPG]]

	Photos are copyright by ~~Techniciain1002~~. Please ask before using elsewhere.		Photos are copyright by Technician1002. Please ask before using elsewhere.

Technician1002: /* The Quick Dump Valve */

2009-07-29T08:40:12Z

The Quick Dump Valve

← Older revision		Revision as of 03:40, 29 July 2009
Line 13:		Line 13:
	A video on the valve theory is posted here; [http://www.youtube.com/watch?v=No3nI07mlQo The Quick Dump Valve]		A video on the valve theory is posted here; [http://www.youtube.com/watch?v=No3nI07mlQo The Quick Dump Valve]

	~~The first mention of the valve on Spudfiles is in this thread. One of the members noticed it before I joined Spudfiles and posted it.~~
	~~[http://www.spudfiles.com/forums/interesting-new-valve-design-t17617.html]~~
	The official contest where the design was posted is here;		The official contest where the design was posted is here;
	[http://inteltrailblazerschallenge.wikispaces.com/The+brag+zone IntelTrailBlazers Engineering Challenge]		[http://inteltrailblazerschallenge.wikispaces.com/The+brag+zone IntelTrailBlazers Engineering Challenge]

			The first mention of the valve on Spudfiles is in this thread. One of the members noticed the contest page before I joined Spudfiles and posted the valve.
			[http://www.spudfiles.com/forums/interesting-new-valve-design-t17617.html Interesting New Valve Design]

	This is a video of the T Shirt launcher in action. They won the competition with the design.		This is a video of the T Shirt launcher in action. They won the competition with the design.

Technician1002: /* The Quick Dump Valve */

2009-07-29T08:28:45Z

The Quick Dump Valve

← Older revision		Revision as of 03:28, 29 July 2009
Line 43:		Line 43:

	The spudfiles page on the cannon is here;		The spudfiles page on the cannon is here;
	[http://www.spudfiles.com/forums/abs-cellular-core-test-cannon-t17968.html]		[http://www.spudfiles.com/forums/abs-cellular-core-test-cannon-t17968.html ABS Cellular Core Test Cannon, also known as the apple cannon]
	It was posted as a materials test discussion on using unrated plastic pipe in air cannons.		It was posted as a materials test discussion on using unrated plastic pipe in air cannons.

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	The Spudfiles entry is here;		The Spudfiles entry is here;
	[http://www.spudfiles.com/forums/quick-dump-valve-t17858.html]		[http://www.spudfiles.com/forums/quick-dump-valve-t17858.html The Quick Dump Valve]
	The spudfiles entry has links to a theory of operation video as well as more photos.		The spudfiles entry has links to a theory of operation video as well as more photos.

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	With high speed of operation and a high flow, the cannon is able to deliver high speeds. The photo is a 2X4 that was split with a couple jawbreakers.		With high speed of operation and a high flow, the cannon is able to deliver high speeds. The photo is a 2X4 that was split with a couple jawbreakers.

	[[Image:Split1a.JPG]]		[[Image:Split1a.JPG]]

	Photos are copyright by Techniciain1002. Please ask before using elsewhere.		Photos are copyright by Techniciain1002. Please ask before using elsewhere.

Technician1002: /* The Quick Dump Valve */

2009-07-23T18:12:40Z

The Quick Dump Valve

← Older revision		Revision as of 13:12, 23 July 2009
Line 16:		Line 16:
	[http://www.spudfiles.com/forums/interesting-new-valve-design-t17617.html]		[http://www.spudfiles.com/forums/interesting-new-valve-design-t17617.html]
	The official contest where the design was posted is here;		The official contest where the design was posted is here;
	[http://inteltrailblazerschallenge.wikispaces.com/The+brag+zone]		[http://inteltrailblazerschallenge.wikispaces.com/The+brag+zone IntelTrailBlazers Engineering Challenge]

	This is a video of the T Shirt launcher in action. They won the competition with the design.		This is a video of the T Shirt launcher in action. They won the competition with the design.
	[http://www.youtube.com/watch?v=9Klxqav_6NM]		[http://www.youtube.com/watch?v=9Klxqav_6NM Quick Reload T Shirt launcher]

	Quick Dump valves can be constructed as either a coaxial design with the valve inside a chamber, or built inside a T for an external valve. I prefer the coaxial designs myself for the best COF values possible.		Quick Dump valves can be constructed as either a coaxial design with the valve inside a chamber, or built inside a T for an external valve. I prefer the coaxial designs myself for the best COF values possible.

Technician1002: /* The Quick Dump Valve */

2009-07-23T18:10:39Z

The Quick Dump Valve

← Older revision		Revision as of 13:10, 23 July 2009
Line 10:		Line 10:

	Unlike a piston valve that uses pressure in a "Pilot" area to hold the valve closed, the QDV has no pressure on the pilot area of the piston to hold it closed. In this manor it is much like a spool control valve.		Unlike a piston valve that uses pressure in a "Pilot" area to hold the valve closed, the QDV has no pressure on the pilot area of the piston to hold it closed. In this manor it is much like a spool control valve.

			A video on the valve theory is posted here; [http://www.youtube.com/watch?v=No3nI07mlQo The Quick Dump Valve]

	The first mention of the valve on Spudfiles is in this thread. One of the members noticed it before I joined Spudfiles and posted it.		The first mention of the valve on Spudfiles is in this thread. One of the members noticed it before I joined Spudfiles and posted it.