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Blowgun

2006-12-04T15:07:06Z

Angel-FR:

[[image:Stanleybostitch850541K.jpg|right|thumb|300px|A shiny blowgun]]
'''Blowguns''' are made for cleaning surfaces with compressed air, but since they have a comfortable grip and a built-in valve that is easily opened by hand, they're commonly used as [[pilot valve]]s in [[pneumatic cannon]]s.

Blowguns have rather limited flow - enough to trigger a small valve, on the order of a 1" sprinkler or slightly bigger, but will not provide enough flow to trigger large valves. For larger valves, it is necessary to use them to trigger a small valve, which then acts as a pilot for the main valve.
Flow can be increased substantially by [[blowgun modification|modding the valve]].

Most blowguns come with a nozzle, and this should be removed since they (almost always) reduce flow further. Most blowguns will only work in one direction, and will leak if pressurized in reverse.

In [[BB machine gun]]s, a blowgun can be used as the primary valve since these guns need less airflow.

[[category:valves]]

Blowgun

2006-12-04T15:06:14Z

Angel-FR:

[[image:Stanleybostitch850541K.jpg|right|thumb|300px|A shiny blowgun]]
'''Blowguns''' are made for cleaning surfaces with compressed air, but since they have a comfortable grip and a built-in valve that is easily opened by hand, they're commonly used as [[pilot valve]]s in [[pneumatic cannon]]s.

Blowguns have rather limited flow - enough to trigger a small valve, on the order of a 1" sprinkler or slightly bigger, but will not provide enough flow to trigger large valves. For larger valves, it is necessary to use them to trigger a small valve, which then acts as a pilot for the main valve.
Flow can be increased substantially by [[blowgun modification|modding]] the valve.

Most blowguns come with a nozzle, and this should be removed since they (almost always) reduce flow further. Most blowguns will only work in one direction, and will leak if pressurized in reverse.

In [[BB machine gun]]s, a blowgun can be used as the primary valve since these guns need less airflow.

[[category:valves]]

Blowgun

2006-12-04T15:05:54Z

Angel-FR:

[[image:Stanleybostitch850541K.jpg|right|thumb|300px|A nice blowgun]]
'''Blowguns''' are made for cleaning surfaces with compressed air, but since they have a comfortable grip and a built-in valve that is easily opened by hand, they're commonly used as [[pilot valve]]s in [[pneumatic cannon]]s.

Blowguns have rather limited flow - enough to trigger a small valve, on the order of a 1" sprinkler or slightly bigger, but will not provide enough flow to trigger large valves. For larger valves, it is necessary to use them to trigger a small valve, which then acts as a pilot for the main valve.
Flow can be increased substantially by [[blowgun modification|modding]] the valve.

Most blowguns come with a nozzle, and this should be removed since they (almost always) reduce flow further. Most blowguns will only work in one direction, and will leak if pressurized in reverse.

In [[BB machine gun]]s, a blowgun can be used as the primary valve since these guns need less airflow.

[[category:valves]]

File:Stanleybostitch850541K.jpg

2006-12-04T15:05:11Z

Angel-FR: A nice blowgun

A nice blowgun

Pilot valve

2006-12-04T14:58:51Z

Angel-FR:

[[image:Ball-valve-stainless-big.jpg|right|thumb|300px|A ball valve can be used as pilot valve]]
A '''pilot valve''' is the valve used to release the air from behind a [[diaphragm valve|diaphragm]] or [[piston valve]], causing it to open. It can vary in flow from a [[schrader valve]] to a 2" [[ball valve]] and above. Small diaphragm and piston valves are also sometimes used as pilots for bigger valves.

[[Blowgun]]s are commonly used as pilot valves since they are easy to open by hand, and many have a trigger grip that fits well into the design of a gun. [[Ball valve]]s are sometimes used since they have much better flow than blowguns, though they are less ergonomical.

[[Slide valve]]s and [[three-way valve]]s are sometimes used as pilots for semi-automatic cannons, in one position the chamber is filled through the pilot, in the other the pilot is exhausted and the main valve triggered.

Some problems that indicate the need for a higher flow pilot valve:
* "[[honking]]" of the valve. This loud noise indicates that your valve is oscillating open and closed.
* A 'dull' sounding launch. (note that this does not apply in the case of a [[chamber to barrel ratio]] near optimum, because there isn't much energy left over to make a loud "crack".)
* [[GGDT]] simulation indicates that your performance would be improved with a larger valve.

[[category:valves]]

File:Ball-valve-stainless-big.jpg

2006-12-04T14:56:36Z

Angel-FR: A ball valve

A ball valve