Does anyone here own a Welch model 1400 vacuum pump? I purchased a used one at a very good price - without the intake chamber. Can someone who owns a model 1400 describe the intake chamber? A new one cost over $120. From pictures on the Welch web site, the intake chamber appears to be just a hollow box with a fitting. If it is simply a box, I would like to weld one together and avoid the $120 purchase. Thank you for your help.
If you don't get an adequate response let me know. I'll be glad to look at the Welch stuff down at the university ( I worked at the chem dept for 8 yrs ) and see what I can find out. It may take a while but I am still in good grace down there. :-) ...lew...
I have what appears to be a model 1405, which seems to be similar to the
1400. The intake chamber is shaped differently, from the illustrations at the Welch website.The chamber appears to be cast iron, about 1/4" thick with a paper gasket between it and the "intake ring" housing. The gasket width is the full thickness of the chamber wall, about 1/4". There are 2 3/8" bolts that pass thru the chamber, and 2 internal spacers (the internal height of the chamber). The 3/8" bolts secure the chamber to the "intake ring" housing.
There is a tall cylindrical screen filter made of fine mesh stainless screen, which is about the same height as the chamber's interior. I was a little surprised to see that the top end of the screen is open. The cylindrical screen is the same size as the port, and is just pushed into the hole.
There was a strange motor setup on this pump. A 1725 RPM 1/3 HP capacitor start motor that had a centrifugal clutch on it. I don't think the clutch is a necessary part. I haven't used this pump yet, it's just been sitting around in case I find a purpose for it.
I've read that these units are great pumps, they were expensive, similar models sell for over a grand. This unit came from a local MSA lab.
I'll bet Pete Rose that I got my pump for less than you got yours.. $8.00, I think.
WB ...............
If the pumps are left under vaccum they tend to have the rotor lock up a bit. The clutch was probably an attempt to allow the motor to start it, stalled.
Best way to shut those down is to vent the intake of the pump to atm, either right after stopping it, or a moment before the motor is turned off.
Jim
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Thanks, that explanation makes the clutch sound reasonable. When I get around to using the pump, I'll (try to) keep that in mind.
WB .................
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