[Steam-engine] Nichols 'D' valve

[Ken Majeski]

Yes, the Steam should hold the valve to the seat. It should be free to move 
away in the event water gets into the cylinder. You can hear them clicking 
if you close the throttle and allow the engine to coast. There should only 
be enough clearance between the valve and yoke to allow it to move in and 
out freely. I have only worked on Case and Minneapolis. On the Minnie there 
are clamps that slide on the valve rod so they are adjustable. On My Case I 
built up the valve block as it was worn some and trued up the prongs on the 
valve. If they are too loose it will cause a click at each end of the 
stroke. For optimum operation the valve and seat should be totaly Flat... 
The easiest way is to put that cylinder in your Bridgeport... The seats 
always seem to be worn concave and the valve convex... They will run Kinda 
OK this way as long as the valve matches the seat...



Ken Majeski, Ellsworth Wis. Case Steam Engine, Minneapolis Steam Engine, 
Rumely Oilpulls H, F, & R. Website, Http://www.pressenter.com/~kmajeski/





>From: David Myers <walking_tractor at yahoo.com>
>Reply-To: Steam-engine mailing list 
><steam-engine at lists.stationary-engine.com>
>To: steam-engine at lists.stationary-engine.com
>Subject: [Steam-engine] Nichols 'D' valve
>Date: Sun, 4 Jul 2004 08:15:08 -0700 (PDT)
>
>Working on a Nichols & Shepard 20-70 with valve issues
>(ie; wear).  Am I correct that the steam is the only
>thing holding the valve to the ports?  There shouldn't
>be any side pressure to the valve rod, right?  In
>other words, the valve should just float in the yoke?
>Also, how much end-play should you have between the
>yoke and the valve?  The original valve has been
>obviously modified so we are using the one off the
>parts engine (same casting number so should work).
>Just want to get the installation right.  The only
>other information I have on valves is setting them.
>The old one had been shimmed with a wedge of wood to
>help hold the valve against the ports, not good.
>Any help would be much appreciated.
>
>=====
>Dave Myers
>Paw Paw, Michigan
>
>In the heart of  Michigan's wine country.
>
>
>
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