Danfoss PVG 32 Service Manual page 10
Proportional valve group
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Service Manual
PVG 32 Proportional Valve Group
Operation
10 |
©
Danfoss | February 2017
the pressure side of the cylinder is fed via the PVPC through the pressure reducing valve to act as the
pilot supply for the electrical actuators.
This means that a load can be lowered by means of the remote control lever without starting the pump.
The built-in check valve prevents the oil from flowing via the pressure adjustment spool to tank.
With the pump functioning normally, the external solenoid valve is closed to ensure that the load is not
lowered due to the pilot supply oil flow requirement of approximately
1 l/min [0.26 US gal/min].
With closed center PVP, the external pilot oil supply can be connected to the pressure gauge connection
without the use of a PVPC plug.
PVPC without check valve for open center PVP
PVPC, without check valve, is used in systems where it is necessary to supply the PVG 32 valve with oil
from a manually operated emergency pump without directing oil flow to the pilot oil supply (oil
consumption about 1 l/min) [0.25 US gal/min].
When the main pump is working normally, the oil is directed through the PVPC plug through the
pressure reduction valve to the electrical actuators.
When the main pump flow fails, the external shuttle valve ensures that the oil flow from the manually
operated emergency pump is used to pilot open the over center valve and lower the load. The load can
only be lowered using the mechanical operating lever of the PVG 32 valve.
With closed center PVP, the external pilot oil supply can be connected to the pressure gauge connection
without the use of a PVPC plug.
For specifications on PVG 32 valves, refer to PVG 32 Technical Information Manual 520L0344.
Oil
Flow
Direction
Oil
Flow
Direction
11039167 | AX00000031en-US0301
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Troubleshooting
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После нескольких поворотов катка гидравлика уходит в аварию при перезагрузке снова срабатывает несколько раз и останавливается в аварии.
The Danfoss PVG 32 hydraulic system could go into fault mode after several turns of the roller due to the following possible causes:
1. Contamination in Hydraulic Oil – Dirt or debris in the oil can affect valve operation.
*Check*: Take an oil sample.
*Corrective Action*: Flush the system and refill with clean, filtered fluid per OEM specifications.
2. Air in Hydraulic Pilot Lines – Air trapped in the signal lines can cause unstable operation.
*Check*: Inspect for air in the signal lines.
*Corrective Action*: Bleed air from the hose connection at the valve section.
3. Low Hydraulic Oil Supply – Insufficient oil can cause pressure drops and improper function.
*Check*: Verify fluid level in the reservoir.
*Corrective Action*: Refill with clean, filtered fluid per OEM specifications.
4. Faulty Hydraulic Remote Actuator – A malfunctioning actuator can lead to inconsistent valve response.
*Check*: Measure signal pressure from the remote hydraulic controller.
*Corrective Action*: Repair or replace the actuator.
5. External Hydraulic Pilot Pressure Too Low – If pressure is too low, the main spool may not function properly.
*Check*: Measure external pilot pressure from the pilot pump and check for restrictions.
*Corrective Action*: Ensure the pilot pressure meets the required specifications.
6. Leaking or Burst Supply Hose – A damaged hose can lead to pressure loss and system faults.
*Check*: Inspect supply lines to the valve stack.
*Corrective Action*: Repair or replace damaged hoses.
These potential causes should be systematically checked and corrected to restore proper system operation.
This answer is automatically generated