There may be a variety of reasons why the burn-off pressure reducing valve cannot reduce the pressure normally. The following are the common reasons and corresponding solutions:

1. Internal component failure or blockage in the pressure reducing valve

Causes:

 -Valve core, seat, or diaphragm wear and deformation leading to poor sealing.

-Foreign matter (e.g., pipeline rust deposits, fuel oil gum) blocking valve passages or filter screens.

-Spring aging or breakage impairing pressure regulation.

Solutions:

-Disassemble and clean the valve body, replacing damaged diaphragm, spring, or core.

-Inspect and clean upstream filters to ensure fuel purity.

2. Incorrect pressure setting or malfunctioning adjustment

Causes:

-Loose or stripped adjustment screw causing pressure setting deviation

-Damaged pressure gauge with inaccurate readings (requires calibration or replacement)

Solutions:

-Re-adjust the pressure reducing valve's output pressure using specialized tools to tighten the adjustment screw

-Replace faulty pressure gauge to ensure reliable readings

3. Abnormal inlet pressure

Causes:

-Sudden increase in upstream gas/oil supply pressure exceeding the operating range of the pressure reducing valve.

-System pressure fluctuations (e.g., pump start-stop shock).

Solutions:

-Check upstream pressure sources (e.g., pumps, storage tanks) to ensure stable pressure.

-Install buffer tanks or pressure stabilizers to mitigate fluctuations.

4. External Environment or Installation Issues

Causes:

 -Incorrect installation direction of pressure reducing valve (e.g., inlet/outlet reversed).

 -High ambient temperature causing diaphragm hardening or seal material failure.

Solutions:

-Verify valve flow direction markings and reinstall correctly.

-Improve ventilation or replace with high-temperature resistant pressure reducing valve models.

5. Other System Interconnection Issues

Causes:

-Leakage in downstream pipelines or incomplete valve closure prevents pressure establishment.

-Parallel standby pressure-reducing valves remain un-isolated, creating bypasses.

Solutions:

-Inspect pipeline seals and valve status to identify and repair leakage points.

-Close redundant pipelines to ensure single-valve operation.

Recommended troubleshooting steps:

1. Initial inspection: Check for unusual noises or leaks, and verify the pressure gauge reading.

2. Cleaning and maintenance: Disassemble and clean the valve body, replacing any worn components.

3. System testing: Isolate the pressure reducing valve and independently test whether its input/output pressures match the set values.

4. Professional support: If issues persist, contact the manufacturer or certified technicians for further inspection.

For further analysis, please provide more details (e.g., valve model, medium type, pressure change before and after failure, etc.).