Page 1 of 1
Penberthy injector
Posted: Thu Jun 14, 2012 1:03 pm
by johnp
When i open the watr supply line i have water coming out the overflow. the pressure from the boat sitting in the water is causing this. how do i get it to stop? even when the steam is open it doesn't seem to close the flapper and inject water into the boiler. is it a supply line throttle that i need to adjust?
Re: Penberthy injector
Posted: Thu Jun 14, 2012 5:44 pm
by artemis
Suggest you get someone experienced to show you how to operate an injector or check online for instructions.
I googled: penberthy operating instructions and came up with
http://www.tycoflowcontrol.com/valves/I ... jector.pdf as well as many other "hits". I selected this (it was also first) because it will tell you a lot about your injector that you should know to maintain and operate it properly.
P.S. Lopez Mike and gondolier88 are both right on in the quick opening of the steam valve. And just like with a feedwater pump, the supply (suction) line must have ABSOLUTELY NO air leaks, This is frequently one of the biggest problems with injectors - there just must be ABSOLUTELY NO air leaks. Just remember, ABSOLUTELY NO air leaks.
Re: Penberthy injector
Posted: Thu Jun 14, 2012 7:03 pm
by Lopez Mike
My experience with injectors from toy to full sized locomotive has been that one shouldn't be shy about opening the steam supply all the way and relatively quickly. You are more likely to get a non flow situation from being too careful.
These mysterious little beasts like to suck. You could probably throttle back the water supply a bit and see if that helps.
All of the problems I have ever had came down to either too hot of supply water, debris in the injector, and opening the steam valve very slowly.
Not to ask an embarrassing question but they won't work if the shutoff valve or check valve between the injector and the boiler are closed or messed up.
That link to Penberthy is a good one.
Re: Penberthy injector
Posted: Thu Jun 14, 2012 9:35 pm
by gondolier88
Lift the injector above the waterline by around 6-10", Penberthy's have a good lifting head- the 6-10" is to keep the head as low as possible, while taking into consideration roll of the boat, trim and waves.
I'm sure you have checked simple things like;
- the check valve into boiler is the right way round,
- that the water coming through is from the water supply, and not coming from the boiler,
Once set up Penberthy's are just the bees knees and will give years of service with no problems at all.
Greg