Difference between revisions of "Honking"
m (+cat, sp) |
(+sprinkler reference) |
||
| Line 4: | Line 4: | ||
# The momentum of the diaphram/piston keeps it going past the point where the pressures on both sides of the diaphram/piston are equal. | # The momentum of the diaphram/piston keeps it going past the point where the pressures on both sides of the diaphram/piston are equal. | ||
# The higher pressure in the [[pilot]] volume now accelerates the piston/diaphram back to where it started... and you can follow the steps from #2, but with the pressure in the pilot volume dropping. | # The higher pressure in the [[pilot]] volume now accelerates the piston/diaphram back to where it started... and you can follow the steps from #2, but with the pressure in the pilot volume dropping. | ||
| + | |||
| + | If a valve is honking, it is most likely not oppening fully, and this will decrease preformance. Honking is often interpreted as a sign that you are using a [[pilot valve]] that is too small, and this occurs most often in un-[[Sprinkler valve modification|modified]] sprinkler valves due to the extreamly small stock pilot. | ||
[[Image:Honk.GIF]] | [[Image:Honk.GIF]] | ||
| Line 9: | Line 11: | ||
(Note the upwards trend in the valve position.) | (Note the upwards trend in the valve position.) | ||
| − | |||
[[category:valves]] | [[category:valves]] | ||
Revision as of 00:14, 27 October 2005
When we say a valve "honks", it means that it vibrates open and closed; the cycle is like this:
- The diaphram/piston unseats, and due to the increase in differential force caused by the "new" area, is pushed back rather quickly.
- Air pressure in the pilot volume starts to build, as the piston/diaphram moves, compressing it.
- The momentum of the diaphram/piston keeps it going past the point where the pressures on both sides of the diaphram/piston are equal.
- The higher pressure in the pilot volume now accelerates the piston/diaphram back to where it started... and you can follow the steps from #2, but with the pressure in the pilot volume dropping.
If a valve is honking, it is most likely not oppening fully, and this will decrease preformance. Honking is often interpreted as a sign that you are using a pilot valve that is too small, and this occurs most often in un-modified sprinkler valves due to the extreamly small stock pilot.
(Note the upwards trend in the valve position.)
