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. :-)
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
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
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.
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