IM-P157-38
CMGT Issue 4
33
Steam/Water Mixing Stations (MkII valves - 2002 onwards) Safety and Operation
5.7 Hosedown gun
The same policy should be followed regarding the gun. A leaking gun should be repaired or replaced
immediately.
Please read in conjunction with Figure 24:
1.
Isolate the steam and cold water supplies by closing the two ball valves.
2.
Discharge the contents of the hose and the station by pulling the gun trigger and eliminate pressure
until the water flow stops.
3
.
Remove the gun from the hose by separating the swivel coupling. Use 1
5/16
" A/F and
7/8
" A/F spanners.
4.
Unscrew the gun from the gun retaining nut of the swivel coupling.
5.
Place the gun in a tub of warm water to soften the rubber cover.
6.
Ease the cover off the back of the gun and secure the gun in for example a vice by clamping the rear
end of the body and ease the cover over the front of the gun.
7.
Unscrew the nozzle from the gun body.
8.
Remove the end screw from the rear of the gun. (The end cap will be loose in the gun body). Remove
the piston (
a
and
b
) and the spring from the gun body.
9.
Remove the top screw from the top of the gun body so that the cylinder can be taken out of the gun body.
10.
To replace the internals, reverse the removal
procedure. In order to do this two points should
be considered: The piston is despatched in two
parts (
a
and
b
); these must be screwed together
before installation. When securing the cylinder
rotate it until the hole in the cylinder lines up
with the hole in the gun body. If the cover only is
being replaced, then follow Steps,
1
to
6
; remove
the gun from the vice to fully take off the handle
part of the cover. To replace a cover, reverse the
removal procedure.
Fig. 24
Top
screw
End
screw
End cap
Cover
Cylinder
Nozzle
a
b
Spring
