< Fittings 2 >
<< regulator >>
The William's regulator is a simple screw
type. To release maximum steam with a minimum
rotation of the handle, it has course thread
and obtuse angle tip in the valve. The valve
body is hold in the boiler, with a brass
pipe fixed onto the regulator bush in the
backhead. Note a small hole in the valve
body to eliminate pressure difference between
inside and outside of the brass tube.
The valve and the spindle is connected rigidly
with a small pin across them. The valve tip
has 120 degree angle.
Both end of the brass tube were squared in
the lathe with 'fixed steady'.
Design of the regulator handle was modified
for easy operation. The base plate was finished
in a rotary table. It has two press-fitted
cocks.
The square hole was cut with a half-round
cutter which had been made for the smokebox
door handle.
A short phosphor bronze pipe was solver-soldered
onto the outlet tube. Because the pipe is
projected into the wet header and sealed
with an O-ring.
Assembled regulator.
<< check valves >>
The hand wheel is just a 'dummy'. Also the
phosphor bronze spindle is just a limit for
the ball valve and it doesn't rotate. It
holds the hand wheel and was lightly jammed
with a hammer. The hand wheel can rotate
freely.
A short union pipe is silver soldered to
the valve body through the gland nut. Note
a dummy plug hanging up the gland nut during
the soldering operation.
<< blowdown valves >>
They are at the both sides of the boiler
foundation ring. Martin Evans' design employs
ball valve in a holder, instead of simple
needle valve. The ball have to rotate freely
in the holder, otherwise it is no sense using
'ball'.
The valve seat was finished with a D-bit
made from carbon steel bar. The tip of the
D-bit was end-milled in correct angle. Then
the tool was hardened, tempered and ground
with oil stone.
The blowdown valve have to be made as short
as possible, because the side rod sweeps
just upon it. The valve end was cut hexagonal
and is operated by a special tool which was
made from Allen screw and round wood.
<< oil mist trap >>
This is an idea of an expert. A brass cup
with a thin plate and a tube is set at the
bottom of the blast pipe. Exhaust flow from
both cylinder is screened by the plate. Then
oil mist is trapped, dropped into the cup
and let out through the tube by blast pressure.
You can get oil-free smoke from chimney.
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