Park & Shunt Valve

Park & Shunt Valve

The basic park and shunt valve is used to actuate and release the service brake, and also the spring brakes on unhitched trailers. It does not provide a pressure protection feature like TrCMTrCM+ or TEM.

352 044/045 xxx variants don't contain an Emergency function, therefore an additional Relay Emergency Valve (REV) with Emergency function is required.

352 046 xxx variant includes an emergency function by using the spring brakes. In addition to this valve there is no additional REV required.

 

Park & Shunt Valve - General

Function

352 044 xxx / 352 045 xxx

Vehicle unhitched, black knob pulled out, red knob pressed in. System pressure is present at port 11. Port 21 is exhausted via the supply coupling head. The service brake has been put into the emergency braking position by the Relay Emergency Valve/emergency brake valve. Port 22 is charged with air (spring brakes released).
When the shunt valve (black knob) is pushed in, port 11 is connected to port 21 (service brake released). The service brake is actuated again by pulling out the shunt valve (black knob).
When the parking valve is pulled out (red knob), port 22 is exhausted. The spring brake is not exhausted (immobilised) until the two-way valve in the system reverses.
If the red line breaks when coupled to the truck the REV activates the service brake via the Emergency function, so ALL wheels of the trailer are braked and anti-lock controlled by ABS/EB+ if the power supply is active.

352 046 xxx

Emergency braking using the spring brakes:
Vehicle unhitched, black knob pulled out, red knob pressed in. System pressure is present at port 11. Port 22 is exhausted via the supply coupling head (spring brakes immobilised). When the shunt valve (black knob) is pushed in, port 11 is connected to port 22 (spring brakes released).
If the red line breaks when coupled to the truck the push-pull valve activates the spring brakes of the trailer, so only the wheels with mounted spring brakes on the trailer are braked and are NOT anti-lock controlled by ABS/EB+ also if the power supply is active.

Symbol

352 044 xxx 352 045 xxx 352 046 001

Note: 1 – Coupling Head RED, 11 – Reservoir, 21 – Output REV port 1, 22 – Output Spring Brake System (DCV / QRV)

Installation

The combined park and shunt valve should be mounted on the vehicle frame with its mounting flange, using two M8 bolts.
Actuator knobs between horizontal and 90° upwards. When painting, protect against the ingress of paint

Label 028 044 309

Warning - Danger!

There shouldn’t be somebody in the hazardous area when coupling/uncoupling or shunting.

Inspection

  1. Test for operation and leaks
  2. Test for correct assembly
  3. Check instruction label

Technical Data

Medium Air
Operating pressure 8.5 bar
Operating temperature -40°C to +80°C
Fixing torque for fittings 34 Nm
Port 1 Supply (red coupling head)
Port 11 Supply (Reservoir)
Port 21 (not for 352 046 xxx) Delivery (Service brake)
Port 22 Delivery (Spring brake)
Port 3 Exhaust (Spring brake)
Ports thread M 16x1.5