See above. I posted a personal experience with flooding.
As I mentioned at the beginning of my post the preferred method was a flow restricter (orifice), no moving parts. This has nothing to do with pressure, only put a maximum limit on flow rate in case of a plumbing failure. A ball valve would be a poor choice here as it's to course an adjustment. Ideally a needle valve would be the best choice for controlling flow.
And as mentioned in my first post, I would never hook city water to my boat.
Ted
Hey it take a lot of valuable time to fill my water tank!! OK I am just lazy...
While I don't ever hook to city water for the previously mentioned reason, if you choose to, you can incorporate a flow restricter before the connection to the boat. Simply, it reduces the hose diameter from 1/2" or greater down to a much smaller size. There's nothing to fail as it's only a hole through a pipe fitting. The same thing can be accomplished by plumbing a gate valve after the dock hose. Once you have it adjusted to the minimum required flow, just remove the hand wheel. The idea is to limit the flow to about 3 gallons per minute.
Ted
Dear Lord, following that thinking, one would never have electricity on board or heaven forbid, propane. The best way to avoid having a boat you own sink is to not own a boat.
I don't think this is the sort of thing the Lord gets himself involved with.
For those that are bothered by dock water, here is a way to solve the problem.
Buy a 120vac solenoid valve and install it just inboard of the dock water fitting on your boat. Wire it up to the dock power breaker, and run one leg of the circuit to a float valve installed in the bilge. That way, any water in the bilge will cause the dock water flow to stop. It won't drain your house batteries since it is 120vac and powered from dock power.
Read closely your moorage agreement. Many prohibit connection.
Wow Really?
You have a handy link to the solenoid that is open till latched shut?
Is the float switch 12V or 120V to trip the relay?
I would be pleased as I have toyed with one for both that and shutting down the ac/heat pumps if the bilge fill from a broken hose.
I don't think this is the sort of thing the Lord gets himself involved with.
While in my slip I would use dock water simply because I didn't want to hear the fresh water pump cycle on and off
It's really a shame that on this forum, it's impossible to discuss a subject where there are different opinions without it getting to be a pissing contest where posters on one side feel compelled to insult those on the other side in an effort to "prove" their point.
It's not supposed to be a matter of winning or losing, it's supposed to be a place to share information.
PS: After five pages of increasing snarkiness, I doubt a single person has changed his or her mind on the subject.