MODULAIR 2 Iss M7
Pneumatics for a single reducer system
Pneumatics for a dual reducer system
Systems designed to supply 4 wearers
are provided with 2 pressure-reducers to
ensure sufficient flow-rate. The reducers
are connected to a common high-
pressure manifold.
The high-pressure manifold has ports that
can accommodate:
Outlets for up-to two pressure reducers;
Inlets for up-to four cylinder connectors;
An outlet for a high-pressure warning
whistle;
An outlet for a high-pressure gauge.
Systems that do not use all ports have
blanking plugs fitted to unused ports.
Medium-pressure air is output by the
reducer, either directly to wearer supply
airlines, or, on hose reel versions, to a
manifold on the hose reel hub.
The high-pressure warning whistle sounds
when pressure in the on-line cylinder falls
below 55 bar.
PRESSURE REDUCER
The pressure reducer is a single stage
spring and piston device with an internal
pressure relief valve that protects the
medium-pressure system from over-
pressurisation.
There are ports in the reducer which
accommodate:
An outlet to the medium-pressure
gauge;
A medium-pressure outlet to the
wearers;
The medium-pressure inlet from an
external supply or an AFU (optional);
An outlet to the medium-pressure
warning whistle (optional).
Air from the cylinder flows through
the high-pressure manifold, enters the
reducer through a jet and flows through
the hollow piston stem to a chamber
above the piston. As pressure in the
chamber rises, the piston is forced down
against the spring until the nylon seat at
the lower end of the piston stem closes
the jet.
When medium-pressure air flows from
the reducer to the wearers, the pressure
in the chamber falls enabling the spring
to lift the piston seat from the jet. This
cycle continues while there is sufficient
air in the cylinder.
The medium-pressure gauge has a
restrictor that limits air-loss to 25 litres
per minute in the event of the gauge
becoming damaged.
HOSE REEL
The hose reel is fitted with 60 metres of
9.5 mm (3/8”) bore airline supply hose. The
hose conforms to EN 14593-1:2005 and
AS/NZS1716 : 2012; and has a maximum
working pressure of 15 bar (220psi). Hoses
are fitted with CEJN safety couplings.
The hose reel manifold can accommodate
up-to two medium-pressure hoses, each
from a pressure reducer; and a medium-
pressure warning whistle.
A rotatable CEJN coupling in the hub
allows the hose reel to turn without loss
of air.
The CEJN parking connector at the top
of the hose reel frame is designed to vent
any pressure from the medium-pressure
circuit.
