Hyundai R 160 LC-3, Руководство по обслуживанию, Страница: 91 / 459

2-62
ڡ
First stage
At the beginning of the relief valve operation,
the pressure in the spring chamber is held
low by the shockless piston, with the result
that the pressure receiving area of the
poppet equals the area(S1) of the poppet
seat. As the result, the pressure receiving
area is comparatively large as compared to
the area (S1-S2) obtained during regular
relief setting. This makes the operating
relief pressure low(About a third of a regular
set pressure) which is maintained till the
shockless piston finishes travel. The
duration in which low pressure is held
depends upon the diameter of the poppet
orifice, the pressure receiving area of the
piston and the piston stroke.
ڢ Second stage
When the shockless piston finishes travel,
the pressure in the spring chamber of the
relief valve rises, equaling the pressures
before and after the poppet to set it to a
regular set pressure.
P=P
1
S
1
S
2
P=P
2