Kit_L
Senior Member
- Joined
- Mar 12, 2016
- Messages
- 476
- Location
- Australia
- Vessel Name
- Suu Kyi
- Vessel Make
- Custom 40' catamaran
Hello all,
I searched the net for a general impression of the design of gate valves; this was the best I found:
https://preview.tinyurl.com/y3rbf52h
Backstory: taking Seabiscuit for spin yesterday, I noticed that although water and exhaust exited the wet system as usual, the exiting water volume was down on normal. I noticed that opening the seacock (a gate valve) there was not the usual tension in the undoing—I thought that, perhaps, the valve handle was spinning in its housing, but not lifting the gate all the way. I should add that I have been using the vessel a few times a week, so I had thought that this had freed up the valve. As well, there looked to be more steam than usual from the exhaust. I put her back on the mooring while I thought about it. Temperature on the dash gauge was normal (82°C).
Thinking though the raw water plumbing, possible blockages could be the strainer on the hull; the raw water 'filter' (a standpipe in the ER with a simple strainer; I have not serviced this for 12 months); and possibly a worn impeller. We are nearing the end of winter here, so growth is slower than in summer, and I have been running the boat regularly.
So, my question: if the handle turns all the way out and all the way in (and it does) is the opening of the gate positive or could the gate be jammed in, and the handle is turning out of it?
[my avatar is the new boat I can't get to; it's stuck in Queensland, a state not permitting travel. The boat I am talking about here is Seabiscuit, the 40' trawler.]
I searched the net for a general impression of the design of gate valves; this was the best I found:
https://preview.tinyurl.com/y3rbf52h
Backstory: taking Seabiscuit for spin yesterday, I noticed that although water and exhaust exited the wet system as usual, the exiting water volume was down on normal. I noticed that opening the seacock (a gate valve) there was not the usual tension in the undoing—I thought that, perhaps, the valve handle was spinning in its housing, but not lifting the gate all the way. I should add that I have been using the vessel a few times a week, so I had thought that this had freed up the valve. As well, there looked to be more steam than usual from the exhaust. I put her back on the mooring while I thought about it. Temperature on the dash gauge was normal (82°C).
Thinking though the raw water plumbing, possible blockages could be the strainer on the hull; the raw water 'filter' (a standpipe in the ER with a simple strainer; I have not serviced this for 12 months); and possibly a worn impeller. We are nearing the end of winter here, so growth is slower than in summer, and I have been running the boat regularly.
So, my question: if the handle turns all the way out and all the way in (and it does) is the opening of the gate positive or could the gate be jammed in, and the handle is turning out of it?
[my avatar is the new boat I can't get to; it's stuck in Queensland, a state not permitting travel. The boat I am talking about here is Seabiscuit, the 40' trawler.]
