INSTALLATION
1. In the case of a naturally aspirated engine the
Chalwyn MPX shut down valve should generally
be fitted as close to the engine air intake mani-
fold as possible. If an air intake flame trap is
also
fitted, the MPX valve must be installed upstream
(air cleaner side) of the flame trap.
2. To avoid excessively high intake air tempera-
tures at the MPX valve when fitted to a turbo-
charged engine, it may be necessary to fit the
valve either upstream of the turbocharger or
downstream of the intercooler (where fitted).
Again, if an air intake flametrap is also installed,
the valve must be fitted upstream of the flam-
etrap.
3. Where more than one MPX valve is fitted to an
engine, as in the case of an engine with multiple
intake pipes, a common pneumatic supply to the
valves should be used to ensure that all valves
close simultaneously.
4. The MPX valve may be installed either hori-
zontally or vertically. Air flow may be in either
direction through the valve. Ensure easy and
safe access to the valve reset lever and, where
applicable, manual stop control. If the valve is
fitted with a cable operated manual stop ensure
a reasonably straight run for the cable.
5. If hose adaptors are used, the mating hose
should be of a reinforced type, provide adequate
support for the valve and prevent excessive
vibration. If necessary, additional support brack-
ets mounted from the engine should be consid-
ered.
6. Particular care must be taken to ensure the
integrity of the intake pipework between the
Chalwyn valve and intake manifold. Ideally
metal pipework should be used and any gaps
kept as short as possible, (taking into account
any relative movement) and closed by reinforced
hose. The possibility of a hose collapse on clo-
sure of the shut down valve must be avoided.
7. Any engine crankcase breather connections
into the intake system between the MPX valve
and engine, or any internal crankcase breather
arrangement venting directly into the engine
intake ports must be sealed and replaced by
an external breather system venting either to
atmosphere or to the intake system upstream of
the shut down valve. External breather system
kits for various engine types are available from
Chalwyn.
8. For valves with the “Push” button cable oper-
ated manual shut down, drill a Ø10mm (3/8”
clearance) hole through the bulkhead (or brack-
et) to which the stop button is to be mounted.
Pass cable end through hole. With the MPX
valve in the latched open position check that,
with the cable inner pressed hard back into the
cable outer, between 20mm and 22mm of the
inner shows.
.
With the MPX valve still latched open, use
a 2mm A/F hexagon key to release the cable
grip screw in assembly RBP-100 to enable the
assembly to be fully screwed onto the cable
outer.
Then tighten the cable locknut onto the back
face of the bulkhead. Finally, fully tighten the
cable grip screw (see diagram below).
Cable lock nut
wound fully back
Check end of
inner is burr free
20 to 22mm
Lock nut - tighten
after fully screwing
RBP-100 onto the
cable outer
RBP-100
Cable Grip Screw
Cable lock nut
wound fully back
Check end of
inner is burr free
20 to 22mm
Lock nut - tighten
after fully screwing
RBP-100 onto the
cable outer
RBP-100
Cable Grip Screw
5T: +44 (0)1284 715739
MPX DIESEL ENGINE SHUTDOWN VALVES
CE236 (9)
