| Fault name |
Cause of failure |
Exclusion method |
| 1、Oil pressure decreases |
| （1） The spring of the safety valve of the oil pump is damaged, so that the oil pressed out by the oil pump flows back to the machine body, reducing the pressure. |
| （2） The oil level of the fuselage is low, and the oil pump cannot absorb oil. |
| （3） The oil suction pipe leaks. |
| （4） Oil pump filter screen storage plug. |
|
| （1）Replace the spring. |
| （2） Inject the specified lubricating oil and raise the oil level. |
| （3） Check the connector. |
| （4） The filter screen should be cleaned. |
|
| 2、The exhaust volume decreases significantly or suddenly |
| (1) The piston ring is clamped in the ring groove due to improper thermal |
| (2) The piston ring is broken or damaged. |
| (3) The air valve leaks. |
|
| (1) Remove for repair. |
| (2) Replace parts. |
| (3) Adjust or repair the air valve. |
|
| 3、Impure exhaust gas (containing oil) |
(1) The oil scraper ring loses its oil scraping function |
(1) Remove for maintenance or replace parts. |
| 4、Contact or collision between piston and cylinder |
| (1) The supporting ring has been worn too much and lost its supporting function. |
| (2) The connection between piston rod and crosshead or piston rod and piston is loose. |
|
| (1) Replace or adjust. |
| (2) Adjust or tighten the fixing. |
|
| 5、The safety valve and load reducing valve fail to work or are stuck |
| (1) Rust or dirt causes poor activity. |
| (2) Excessive spring force. |
|
| (1) Remove rust and grind the sealing surface, and apply silicone oil on the sealing surface. |
| (2) Adjust to meet the requirements. |
|
| 6、Exhaust temperature too high |
| (1) The air valve leaks. |
| (2) The piston ring is damaged and of poor quality, causing the gas at both ends of the cylinder to collude with each other. |
|
| (1) Grind the sealing surface of the valve seat and valve disc, or replace the valve. |
| (2) Repair or replace the piston ring. |
|
| 7、Abnormal primary exhaust pressure |
| (1) The primary exhaust pressure is high, because the secondary inlet valve leaks or is damaged. |
| (2) The pressure of the primary exhaust valve is low, because the primary suction and exhaust valves leak or are damaged. |
|
| (1) Grind or replace the secondary air valve. |
| (2) Grind or replace the primary air valve. |
|
| 8、The secondary exhaust pressure cannot reach the specified value |
(1) The secondary exhaust valve may have serious air leakage or damage. |
(1) Grind or replace the new air valve. |
| 9、Blowdown valve failure |
| (1) Dirt enters the blowdown valve and blocks the vent hole. |
| (2) Dirt jammed the float of the blowdown valve. |
| (3) The blowdown valve element is damaged. |
|
| (1) Clean the drain valve and remove dirt. |
| (2) Clean the filter screen to improve cleanliness. |
| (3) Replace the sewage network. |
|
| 10、Serious packing leakage |
| (1) The packing is seriously worn and deformed and loses air tightness. |
| (2) The spring hoop force is too small and does not fit tightly with the piston rod. |
|
| (1) Replace with new seals. |
| (2) Adjust the spring or replace it with a new one. |
|
| 11、Bearing bush temperature too high |
| (1) The clearance between bearing bush and shaft is too small. |
| (2) The viscosity of the lubricating oil is incorrect, the oil is dirty or the lubricating function is lost. |
| (2) The viscosity of the lubricating oil is incorrect, the oil is dirty or the lubricating function is lost. (3) Poor assembly and poor contact surface. |
| (4) The bearing is fixed too loosely or too tightly. |
|
| (1) Adjust to the proper clearance. |
| (2) Replace with new oil. |
| (3) Recalibrate after inspection. |
| (4) Tighten to a proper torque. |
|
| 12、Air leakage of safety valve |
| (1) The spring is not tightened or the elastic force disappears. |
| (2) There are dirt and impurities between the valve plug and the valve seat. |
| (3) The sealing surface of valve plug and valve seat is not tight. |
|
| (1) Adjust or replace with a new spring. |
| (2) Purge and clean. |
| (3) Adjust or grind the sealing surface. |
|
| 13、The compressor makes abnormal noise |
| (1) Hard objects fall between the cylinder and the piston. |
| (2) The connection between piston rod and crosshead is loose. |
| (3) The radial clearance between the connecting rod reducer bearing and the shaft is too large. |
| (4) The installation of the suction and exhaust valve is loose, and there is a noise due to gas impact. |
| (5) The air valve collides with the piston. |
|
| (1) Stop and take out the hard objects. |
| (2) Tighten the nut. |
| (3) Check the clearance and replace the bearing. |
| (4) Tighten the nuts on the gas valve cover. |
| (5) Adjust the upper and lower dead center clearance. |
|
| 14、Blisters discharged from cooling water |
| (1) The cooling pipe of the cooler core leaks. |
| (2) The cooling tube and tube sheet are not tightened. |
| (3) The gasket between the pneumatic cylinder head and the cylinder is damaged. |
|
| (1) Repair welding leaks or replace core components. |
| (2) Re expand the pipe. |
| (3) Replace the cushion. |
|
15、Oil seal and storage of compressor:
The compressor is greased and sealed before leaving the factory. Generally, the storage time is one year (from the date of warehousing). After that, it must be cleaned, greased and sealed again. If it is stored in an open, humid and corrosive environment, the storage time must be reduced according to the specific situation, and the storage shall be updated in advance.
If the use needs to be suspended during use, the moving surfaces without oil lubrication, such as air valves, cylinders, piston parts, pistons, etc., should be oiled and sealed for more than half a month. If more than a month, they should be cleaned according to the sealing method, wiped clean, coated with anti-corrosion grease, and stored in oil seals. |
