6
Description of components
DESCRIPTION OF BRAKE COMPONENTS
1-13
At the same time the pressure in chamber (15)
will push diaphragm (12) with piston (13)
upwards, thus causing valve (14) to be released
from piston sleeve (7). Chamber (15) can now
be vented via port 7. The pressure in port (2)
moves relay piston (16) upwards, thus releasing
exhaust (17) and providing an escape for this
pressure via the valve vent.
When a vehicle carries no load, piston sleeve
(7) is in its lowest position. The input pressure at
port (4) forces piston (13), which is rigidly
connected to diaphragm (12), off the ridges in
the valve body so that the effective surface of
the diaphragm is gradually enlarged. Since in
this position the effective surface of the
diaphragm is larger than that of piston (13),
piston (13) will move upwards and close inlet
valve (14).
3
ǹ 0006