jma1009
Elder Statesman
Posts: 5,901
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Post by jma1009 on Apr 30, 2015 23:22:55 GMT
hi hayden,
so far as lubricator output pressure is concerned it need be no more than the working pressure of the loco ie what the safety valves are set at. the steam chest pressure will always be less than the working pressure.
cheers, julian
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Andrew C
Part of the e-furniture
Posts: 447
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Post by Andrew C on May 2, 2015 21:44:29 GMT
Adam
I have a 4 cylinder Atlantic which has restricter valves one in each out side and one to the centre of the inside cylinder. I have alway assumed that the idea was to balance the delivery so no one cylinder had all the oil and the expense of the others.
Julian thank you for reminding us (well me actually) on what force the pump needs to work against
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Post by steamcoal on May 3, 2015 9:17:01 GMT
Andrew.
Do you know that all four cylinders receive oil,or the same amount of oil.
Does it appear on piston rods, but if they are clean what then. No oil or good seals?
Interesting.
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Post by Deleted on May 3, 2015 12:19:19 GMT
(1) Problems with condensate in lubricators are eased a little if the oil feed pipe goes down hill all the way from lubricator to oiling point for cylinders . Not easy to arrange with LBSC lubricator behind buffer beams but easy enough with lubricators on running boards .
(2) No reason not to fit a drain valve on bottom of oil tank .
(3) No arrangement of one oil pump and restrictors can be relied upon to distribute oil into individual cylinder feeds properly .
(4) Source of many problems with common types of mechanical lubricator in model sizes is that they run so slowly . This means that any minor defects with valves or small amounts of leakage past piston will prevent proper action of pump . With a faster acting pump these minor defects would cause less or no difficulties .
Just mention that valves are often in a very uncertain state in a slow acting pump - not enough flow to snap them open or shut .
(5) Probably better anyway to arrange a quick action pump which gives a definite shot of oil at regular but spaced intervals .
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Andrew C
Part of the e-furniture
Posts: 447
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Post by Andrew C on May 4, 2015 17:16:36 GMT
Andrew. Do you know that all four cylinders receive oil,or the same amount of oil. Does it appear on piston rods, but if they are clean what then. No oil or good seals? Interesting. Well SteamCoal the truth is I probably don't. However the center should be getting slightly more as the valve is open further but not by much and there is a smear on the chimney rim as you can see the valves on the front of the cylinders and the middle of the inside ones. As for seeing if there is oil coming out of the gland nuts you can hardly see the inside crosshead let alone the gland! but to keep to the thread she is fitted with a simple hydrostatic you can just see the top of it in the cab side window and no check valves at all you just need to remember to turn the steam to the tank off when you drop the fire (or try and fill the tank ) there is a drain in the bottom of the tank to get the water out. At least with a hydrostat you instantly know the tank is empty (you get water bubbles in the sight glass!) Andrew
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