"Maintenance-free, trouble-free, in-stall-and-forget." They're all pretty
phrases, but every engineer knows
from experience they don't apply to
regulating valves. Any valve designed
to control temperatures or pressures
within tight limits can be affected by
dirt or other foreign matter in steam
One advantage of the external pilot
mounting shown above is simplified
maintenance. Trouble shooting is
faster, downtime is reduced, and tempers don't take such a beating. Here's
If trouble develops, it's easy to find
out if it's in the pilot or the main
valve. Just remove the tubing bend at
A. A simple test, without any instru-
Spence Type ED Pressure Regulator
ments or other equipment, shows
where the trouble is.
If the trouble is in the pilot, you
can remove it by disconnecting the
unions at B. There's no need to take
the main valve out of the line.
The quickest way to get the regulator functioning again is to install a
spare pilot. This is easy - and in the
Spence design it's not expensive to
carry spare pilots. Spence pilots fit all
sizes of Spence main valves. There's
no need to stock an expensive inventory of pilots for each main valve size.
In the enlarged sectional drawing
above, you can see how the strainer,
seat and disc of the pilot are readily
accessible by removing the blind flange.
If the trouble is in the main valve,
here again inspection is easy. If there's
dirt in the steam line, it may clog the
bleed port or restriction orifices. In
the Spence design these can be inspected and cleaned by merely removing the tubing connections. The seat
and disc of the main valve can also be
inspected easily by removing the top
These maintenance advantages, plus
other advanced design features, are
available for a wide range of regulating
applications. For infoffilation on
Spence's wide range of different automatic regulating valves, write for your
copy of Bulletin 1005.
SPENCE ENGINEERING COMPANY, INC.
Walden, New York