Answer: (1) Fault phenomenon. During operation, the working pressure exceeds the rated pressure but continues to operate, or continues to rise until the safety valve is activated.
(2) Cause analysis.
1) Improper setting of the pressure switch or drift after setting;
2) Poor operation of the air inlet valve;
3) If the discharge solenoid valve fails when the system stops using gas, the pressure will slowly rise;
4) Control circuit failure.
(3) Elimination method.
1) Repair the pressure switch and replace it if necessary;
2) Add lubricating grease after disassembly;
3) Repair and replace the discharge solenoid valve;
4) Repair or replace.
