9/21/8 - Semi-Automatic Cylinder Drain Valves

Once again, I've re-invented the wheel. Earlier, you may have seen the "Automatic Cylinder Drain Valves" (page 23). These are "Semi-Automatic". They work exactly like the old valves - except...

Water can freely run out, just as before, and steam pressure closes the ball valve against it's seat. But the new valve can also be forced open by applying steam pressure to the back end fitting.

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Image 178 -- A Semi-Automatic Cylinder Drain Valve

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Image 179 -- Exploded View - Cylinder Drain Valve

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Image 180 -- Exploded View - Cylinder Drain Valve

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Image 181 -- Piping the Cylinder Drains

8/3/9 - Moving the Reverse Shaft

This chassis always ran well in forward, but always ran poorly in reverse. The problem was - in the reverse position, the pivot point on the lifting arm was too far from the reverse link pivot point.

When the reverse link would roll forward, the radius rod would pull against the lifting link, causing the radius rod to lift and potentially hit the top of the reverse link. This in turn caused poor valve timing in reverse.

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Image 182 -- The OLD Reverse Shaft location

Raising the reverse shaft and moving it forward would help, but the lifting arm would collide with the reverse link long before one could move it far enough forward to fix the problem.

The solution -- Move the reverse shaft ahead of the reverse link. This way, the lifting link is on the same side of both pivot points.

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Image 183 -- The NEW Reverse Shaft location

I did have to make new reverse shaft bearings as the lifting arms now must run outside the bearings. I also had to make longer lifting links since the lifting arm can't reach down into the link bracket as it could before. The reverse shaft had to be shortened by about four inches. It is no longer the widest part on the locomotive.

I had to make two "goof plates" (one for each side). These cover up the old reverse shaft bearing locations on top of the reverse link brackets and populate the old screw holes.

Note: I did not invent anything. Many locomotive use this reverse shaft location. It took Baldwin a few years to figure this one out.

11/13/9 - Mechanical Lubricator

A Mechanical Lubricator is a device used in Steam Engines to force lubricating oil into the cylinder(s) against the prevailing steam pressure.

This has been a major stumbling block for a very long time. I started by trying to use an off-the-shelf mechanical lubricator from one of the live steam suppliers. First, the unit seized up and I had to disassemble it. Then I noticed the internal check valves didn't work. Branch pipe pressure was forcing air (or steam) back through the lubricator. Next I noticed it didn't deliver under pressure.

it was difficult to come up with a scheme that would deliver tiny quantities of oil consistantly and under up to 125 PSI of pressure, regardless of train speed.

I've spent almost two years and tried about 7 different designs. But most of the designs I've tried had the same basic flaw. The pressure they could deliver was proportional to the speed at which they were operated.

This is serious problem since the higher steam pressures are generally seen at the lower speeds. If the steam pressure at the valves exceeds the pressure the lubricator can deliver - You get NO oil.

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Image 184 -- Finally, A Mechanical Lubricator that Works

This design uses springs to apply pressure to the pistons and a lever and cam to pull the pistons back. But, the cam releases the pistons instantly, making the delivery pressure totally independent of the axle speed.

I need to add volume control knobs to each pump. Other than that, it's ready to go.

Bill