roundhouse TALIESIN, Owner'S Handbook Manual, Page: 20 / 24

the grub screw that holds the knob in place tightens into a groove
near the end of the spindle.
See photograph below.
WATER TOP UP VALVE
Steam or water leaking back through the top up valve is usually
caused by dirt particles preventing the valve from sealing correctly.
The valve consists of a simple silicone rubber tube over a brass
valve body. To clean, remove the boiler filler plug and unscrew the
hexagon valve body from the top. Once removed, the silicone tube
on the lower half of the filler valve body can be carefully removed
by sliding it off. Clean the tube and valve body and replace the
tube. If the tube is damaged, a replacement is available from the
Roundhouse factory. Replace the filler valve in the top of the filler
plug, not forgetting the copper washer.
The tip of the plastic tube on the pump bottle will, over time,
become smaller in diameter and fail to seal correctly into the
tapered socket of the top up valve. When this occurs, simply cut
about 6mm from the end of the tube to restore the seal.
20
Gas Regulator (Internal Parts)
Regulator
Body Back-Lash
Spring
Regulator
Spindle White PTFE
Washer Knurled
Knob
‘O’ ring to be
lubricated Hexagon
Retaining
Nut