steve_l
Well-Known Member
One further comment/observation...
All the ball valves that I have seen burst have done so from the "open" end, ie the end that the innards are assembled from. So that would be the rhs of the Marelon valve in Vyv's pic above. The "closed" cast end seems to stay intact and maintains the seal between the ball and it's plastic (nylon?) seating.
The point being that the valve should be assembled on the hull with the "open" end inboard so that if it does burst it will stay sealed when it thaws, at least until you open it.
If assembled with the " open" end towards the hull, then if it bursts it will p*iss water all over the place as soon as it thaws...
All the ball valves that I have seen burst have done so from the "open" end, ie the end that the innards are assembled from. So that would be the rhs of the Marelon valve in Vyv's pic above. The "closed" cast end seems to stay intact and maintains the seal between the ball and it's plastic (nylon?) seating.
The point being that the valve should be assembled on the hull with the "open" end inboard so that if it does burst it will stay sealed when it thaws, at least until you open it.
If assembled with the " open" end towards the hull, then if it bursts it will p*iss water all over the place as soon as it thaws...