
130
1-Upper housing; 2-upper piston; 3-lower piston; 4-discharge valve; 5-inlet valve; 6-valve case; I-outlet
from manual brake valve; II-outlet from spring-type brake actuators; III-atmospheric outlet; IV-outlet from
air tank; V-outlet from brake valve
Figure 110 - Parking Brake Relay Valve
4.5.4.2 Parking brake relay valve
is shown in Figure 110. Compressed air from the air
tank is fed to outlet IV. Outlet I is connected with emergency and parking brake valve; outlet II -
with spring-type brake actuators. Control pressure from the primary brake system. Herein, air
from parking brake system tank is fed to brake actuators.
When actuating primary brakes, parking brake system is locked.
If there is no pressure at outlet I, piston 3 is up. Inlet valve 5 is close by spring force, and
discharge valve 4 is open. Spring-type brake actuators are connected with the environment
through outlet III and open discharge valve and outlet II. The truck is braked by spring-type brake
actuators. If the truck is herein braked by primary brake system, pressure from brake valve is fed
to outlet V, which moves its together with piston 3 downwards impacting the piston 2. Herein,
discharge valve 4 closes and discharge valve 5 opens. The primary brake is protected from force
coming from primary brake diaphragm and brake actuator spring.
4.5.4.3 Check valve
is shown in Figure 111. When compressed air is fed to outlet I the
valve 2 overcoming spring 3 force, opens and that ensures compressed air flow to outlet II. When
pressure at outlet I drops, valve 2 seats into housing 1 by the spring 3 force and pressure differ-
ence at outlets II and I. Reverse compressed air flow from outlet II to outlet I becomes impossible.
Содержание 4320M
Страница 1: ...URAL 4320М TRUCK and its Modifications ...
Страница 34: ...33 Figure 17 Truck Ural 43206 0551 71 Figure 18 Truck Ural 43206 3111 79 Figure 19 Truck Ural 43206 3511 79 ...
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Страница 159: ...156 Figure 123 Engine Electronic Control Unit Wiring Scheme ...
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Страница 177: ...Figure 140 Installation of left and right side safety devices 171 ...
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