6
Description of components
DESCRIPTION OF BRAKE COMPONENTS
1-41
KNORR design with circuit 3 reverse flow
function
Purpose
The purpose of the four-circuit safety valve is to
split up the brake system into four parallel
circuits, and at a failure of one circuit, to protect
the remaining circuits against full venting.
The purpose of this version is to prevent the
spring-brake cylinders (circuit 3) from being
vented, or vented again, if the pressure in the
service brake circuit 1 is too low.
Operation
The opening pressure is the pressure applied at
port 1 for opening valves (8), (9), (10) and (11)
when the brake system is not pressurised.
The opening pressure is determined by
diaphragm surface (a) and by the force of the
spring acting on the diaphragm.
The static closing pressure is the pressure in the
intact circuits whereby the valves in these
circuits are forced onto their seats, if an air
leakage occurs in a faulty circuit, and the
compressor fails to refill the system.
The static closing pressure is determined by
diaphragm surface (a) and (b) and by the force
of the spring operating on the diaphragm.
R600043
21
3
1
23
24
22
R600337
3
ǹ 0006