As per LAVAC drawings I had not installed an antiphon valve in the waste hose, this was a mistake. The water siphoned back into the bowl and while it did not overflow it did back-flow waste from the hose with the inevitable smell.
Antiphon valve now installed. All hoses/pump etc. surface installed for ease of maintenance. Wife not majorly impressed but she won't be maintaining it AND its the boy heads.
In keeping with the "boy heads" element it will pump directly overboard (where legal) or back to the holding tank in the engine room. As I hate "Y" valves I have copied this system from another W42.
4 comments:
Is it a vented loop type anti siphon valve or is it a one way valve ?
I don't see how the anti-siphon valve would solve this problem.
If waste water can move backwards through your pump it will do the same when the vent on the anti siphon valve opens.
If it's a one way valve, you are just adding another valve to the two that are already in the pump.
Cheers,
John.
Hi John
No, its a vented loop (anti-siphon valve).
This is an excerpt from a Don Casey Article:
Vented Loop; If your head is mounted below the waterline, or if it moves below when the boat heels, you must have a vented loop in a discharge line that connects to a through-hull fitting. Otherwise, if the head's internal valves are held open by debris-an inevitable occurrence-water will siphon back into the boat. Poor head installations sink boats every year. Mount the vented loop so it will remain above the waterline at all heel angles. Clean the anti-siphon valve regularly to keep it functioning.
I agree that the vented loop is a good safety measure in case of pump failure, but if waste can move backward through your pump then it is failing.
Agreed, evev though it's a new pump I will check the joker valves ASAP. This is why it's installed on the bulkhead.
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