SCR air pressure limiter solenoid valve, component description

B14.40-0089-06

Position arrangement

Represented in model 382.154

6 Compressed air control unit

7 Pressure limiting solenoid valve (33.01)

The pressure limiting solenoid valve (7) is part of the compressed air control unit (6), and is found internally on the right side of the frame, on the level of the SCR catalyst.

Task

The pressure limiting solenoid valve (7) opens and closes the connector to the compressed air circuit for the auxiliary consumers

B14.40-0179-03

Composition

1 Admission

2 Electromagnetic armature

3 Outlet

4 Pressure spring

5 Solenoid

7 Pressure limiting solenoid valve (33.01)

A Supply connector

B Work connector

C Breather

D Compressed air chamber

The pressure limiting solenoid valve (7) is an electronically actuated 3/2 way valve.

Function

Pressure limiting solenoid valve (7) is opened and deviates the compressed air from the circuit on the supply line when the SCR frame command module transmits the signal based on the module calculation of the engine control (MR).

The supply line is linked to connector (A). The compressed air originated from the tank flows through the compressed air chamber (D) and the work connector (B). The valve's body is and electromagnetically induced one(2), that maintains the output (3) closed because of the spring pressure acting (4).

When a current is supplied to the solenoid (5), the induced one (2) moves upwards, the input (1) is closed and the output (3) is opened. The work line compressed air, at this point, escapes through the output (3) and vie the breather (C) to the open air.

When the current to the solenoid (5) is interrupted, the pressure spring (4) pressure the electromagnetically one (2) to its final position. At this point, the output (3) is closed, the input (1) opens and the air system returns to the work line.