Dynamic Response Valve Block
The valve block is located below the RH sill of the body and is secured with three bolts and rubber bushes to captive nuts located in the chassis. The rubber bushes isolate the valve block preventing hydraulic noise from transmitting through the body.
| Item Number | Description |
|---|---|
| 1 | Nut (3 off) |
| 2 | O ring (3 off) |
| 3 | Directional control valve coils (DCV1 and DCV2) |
| 4 | O ring (3 off) |
| 5 | DCV1 |
| 6 | Pressure transducer |
| 7 | Mounting bush (6 off) |
| 8 | Washer (7 off) |
| 9 | Bolt (3 off) |
| 10 | Nut |
| 11 | O ring |
| 12 | High pressure filter |
| 13 | O ring |
| 14 | Pipe connections |
| 15 | Stud (3 off) |
| 16 | Pressure control valve |
| 17 | O ring |
| 18 | Pressure control valve coil |
| 19 | DCV2 |
| 20 | Spacer (3 off) |
| 21 | Captive nut (3 off) (chassis mounting) |
The valve block directs hydraulic pressure to the actuators via solenoid operated directional control valves. A solenoid operated pressure control valve regulates the required pressure to the actuators. The three solenoid valves are controlled by signals received from the dynamic response control module. A pressure transducer monitors the pressure generated by the Pressure Control Valve (PCV). A serviceable high pressure filter is installed into the underside of the valve block and filters the hydraulic fluid before it reaches the control valves. The filter must be changed at the intervals defined on the vehicle service schedule.
The two Directional Control Valves (DCV's) are fitted to ports in the top face of the valve block. The DCV's are screwed into the valve block and are sealed with O rings. Each DCV has a solenoid for electrical operation of the valve. The solenoid is sealed to the DCV with two O rings and secured with a threaded nut. The nut, coil and O rings are serviceable parts. The DCV's are non-serviceable and failure of a DCV requires replacement of the valve block assembly.
The PCV is fitted to a port in the rear facing end of the valve block. The PCV is screwed into the valve block and is sealed with O rings. The PCV has coil for electrical operation which is sealed to the PCV with two O rings and secured with a threaded nut. The nut, coil and O rings are serviceable items. The PCV is non-serviceable and failure of the PCV requires replacement of the valve block assembly.
The pressure transducer is located in the forward facing end of the valve block and is sealed with an O ring. The pressure transducer measures the hydraulic pressure and returns a signal to the Dynamic Response control module.
A high pressure filter locates in a port on the lower face of the valve block. The gauze and fibre filter is sealed in the port with O rings and is secured with a threaded cap which is also sealed with an O ring. A threaded hole in the lower face of the filter allows a bolt to be fitted to remove the filter from the port. If a system hydraulic component is replaced, the filter must also be replaced.
Four ports are located on the forward facing end of the valve block and two ports on the opposite end. Each port is fitted with a seal pack which contains two O rings and backing rings. The pipes locate and seal in the seal packs and are secured to the valve block with studs and nuts.