Spottsville
Senior Member
- Joined
- May 3, 2012
- Messages
- 265
- Location
- US
- Vessel Name
- Quiet Company
- Vessel Make
- Great Harbour GH-47
Hey Norm: Why not drop a PM to Kraftee here on the forum. It surely is a syphon break but he would recognize which one.
Is the device before or after the pump? If before the pump, the line is under vacuum and a plug is sucked against a hole to allow water to be pulled to the pump. If after the pump, the line is under pressure and the plug is pushed against the hole. When the pump stops, the vacuum or pressure goes away, the plug unblocks the hole, and the siphon is broken. Maintenance generally consists of making sure the plug can move freely from one position to the other and that the seating surfaces are in good condition.
Ted
This helps a lot. When I read your operational description and look at the picture of the siphon brake in the link posted by SoWhat it makes total sense now.
THANKS!
Norm
That gadget in the top of loop appears to be an air valve, which would eliminate the vent for a vent line on the loop because it stays closed to prevent water that's be PUSHED through a line from being squirted out the vent, only opens to allow air into the line through which water is being PULLED--iow break a siphon.
Exactly what I have....and for the failure reason you state.Actually it can be a pressure line. If you don't vent the line to the outside, it may pump water in the boat if the valve sticks open. If it were my boat, that would be a tee with maybe a 1/4" hose pissing a stream out the side when the engine is running. No valve to go bad and a tell tail showing the water pump was working. Obviously the above wouldn't work if the siphon break was on the vacuum sise of the pump.
Ted
Figure out what hoses are attached to the vented loop. Could be engine, bilge pump, head system.
If engine, it should piddle out the overboard vent line. It may have a valve in the thingy on the top, if so, service it. A drilled orifice is better than a valve as if the valve sticks, you may not know it until engine is filled with water. With the orifice if you see piddle, you are good to go.