Pilot - Revision history

Technician1002: Added larger pilot volume consideration for narrow ratio valves. Added small pilot and high flow for chamber sealers and wide ratio pistons.

2010-12-13T18:10:19Z

Added larger pilot volume consideration for narrow ratio valves. Added small pilot and high flow for chamber sealers and wide ratio pistons.

← Older revision		Revision as of 13:10, 13 December 2010
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	A '''Pilot''' is the airspace behind the [[piston valve\|piston]] or [[diaphragm valve\|diaphragm]] in a [[valve]], which is vented to open the valve. For maximum performance, its volume should be as ~~low~~ as ~~possible while still allowing for~~ the ~~valve to open fully~~. Its is usually exhausted by means of a built-in [[solenoid]] or an external [[pilot valve]].		A '''Pilot''' is the airspace behind the [[piston valve\|piston]] or [[diaphragm valve\|diaphragm]] in a [[valve]], which is vented to open the valve. For maximum performance, its volume should be small to provide fast response as well as being large enough to minimize compression of the pilot volume. Its is usually exhausted by means of a built-in [[solenoid]] or an external [[pilot valve]].

			Considerations on deciding on the proper pilot volume includes the size of the pilot valve, the ratio of the piston being piloted, and the valve style, a barrel sealer or chamber sealer.

			A barrel sealer piston valve with a large OD and a small seat diameter can provide a piston that acts much like a hydraulic valve where the speed of motion is directly related to the rate the pilot is vented. A small pilot volume and a large fast high flow pilot valve provides good performance with this style piston.

			A chamber sealer piston requires a small pilot volume and high flow fast pilot to open them quickly. Sprinkler valve or other high flow fast pilots are recommended.

			On a low leakage barrel sealer piston with a seat near the diameter of the piston in a barrel sealing configuration, high performance can be achieved with a smaller pilot valve such as a blowgun and a larger pilot volume to reduce compression of the pilot air volume when the piston opens. The narrow ratio pistons remain closed until the pilot pressure is very low due to the small area exposed to the chamber pressure while closed. This reduces the initial amount of air pressure in the pilot when the valve cracks open. When the valve pops open, with a larger pilot volume, the pressure rise in the pilot is low, so the piston pops open and remains open without requiring a large flow pilot. Low piston friction and low EQ bleed flow is required to get this high performance. Floating o ring seals are recommended for narrow ratio pistons. Too large of a pilot volume in this style of pilot arrangement does increase the time from when the trigger is pulled to when the pilot pressure is low enough to unseat the main piston. This time increases the amount of time the chamber has to bleed down through the piston EQ port into the pilot. A low flow EQ port is recommended as well as a moderate pilot volume to reduce pilot pressure rise as the piston opens.

			See the section on piston valves for more information on piston valve configurations.

	[[category:valves]]		[[category:valves]]

Benstern: added link

2008-06-01T12:37:21Z

added link

← Older revision		Revision as of 07:37, 1 June 2008
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	A '''Pilot''' is the airspace behind the [[piston valve\|piston]] or [[diaphragm valve\|diaphragm]] in a valve, which is vented to open the valve. For maximum performance, its volume should be as low as possible while still allowing for the valve to open fully. Its is usually exhausted by means of a built-in [[solenoid]] or an external [[pilot valve]].		A '''Pilot''' is the airspace behind the [[piston valve\|piston]] or [[diaphragm valve\|diaphragm]] in a [[valve]], which is vented to open the valve. For maximum performance, its volume should be as low as possible while still allowing for the valve to open fully. Its is usually exhausted by means of a built-in [[solenoid]] or an external [[pilot valve]].

	[[category:valves]]		[[category:valves]]

Benstern: spelling

2007-06-03T05:45:05Z

spelling

← Older revision		Revision as of 00:45, 3 June 2007
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	A '''Pilot''' is the airspace behind the [[piston valve\|piston]] or [[diaphragm valve\|diaphragm]] in a valve, which is vented to open the valve. For maximum performance, its volume ~~shoud~~ be as low as possible while still ~~alowing~~ for the valve to open fully. Its is usually exhausted by means of a built-in [[solenoid]] or an external [[pilot valve]].		A '''Pilot''' is the airspace behind the [[piston valve\|piston]] or [[diaphragm valve\|diaphragm]] in a valve, which is vented to open the valve. For maximum performance, its volume should be as low as possible while still allowing for the valve to open fully. Its is usually exhausted by means of a built-in [[solenoid]] or an external [[pilot valve]].

	[[category:valves]]		[[category:valves]]

GalFisk: +cat, sp, etc

2005-10-24T14:40:18Z

+cat, sp, etc

← Older revision		Revision as of 09:40, 24 October 2005
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	A '''Pilot''' is an airspace ~~that is emptied to open a~~ [[piston valve\|piston]] or [[~~diaphram~~ valve\|~~diaphram~~]] valve. For maximum performance, its volume shoud be as low as possible while still alowing for the valve to open fully. Its is ~~emptied~~ by means of a [[solenoid]] or a [[pilot valve]].		A '''Pilot''' is the airspace behind the [[piston valve\|piston]] or [[diaphragm valve\|diaphragm]] in a valve, which is vented to open the valve. For maximum performance, its volume shoud be as low as possible while still alowing for the valve to open fully. Its is usually exhausted by means of a built-in [[solenoid]] or an external [[pilot valve]].

			[[category:valves]]

1984 at 00:36, 24 October 2005

2005-10-24T00:36:44Z

← Older revision		Revision as of 19:36, 23 October 2005
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	A '''Pilot''' is an airspace that is ~~vacuated~~ to open a [[piston valve\|piston]] or [[diaphram valve\|diaphram]] valve. For maximum performance, its volume shoud be as low as possible while still alowing for the valve to open fully. Its is emptied by means of a [[solenoid]] or a [[pilot valve]].		A '''Pilot''' is an airspace that is emptied to open a [[piston valve\|piston]] or [[diaphram valve\|diaphram]] valve. For maximum performance, its volume shoud be as low as possible while still alowing for the valve to open fully. Its is emptied by means of a [[solenoid]] or a [[pilot valve]].

1984 at 00:36, 24 October 2005

2005-10-24T00:36:24Z

New page

A '''Pilot''' is an airspace that is vacuated to open a [[piston valve|piston]] or [[diaphram valve|diaphram]] valve. For maximum performance, its volume shoud be as low as possible while still alowing for the valve to open fully. Its is emptied by means of a [[solenoid]] or a [[pilot valve]].