日期：2026-02-13　　阅读()　　发布：admin

The root cause of the electro-hydraulic lifting platform jammed valve is that the mating gap between the spool (the precision part that moves inside the valve) and its valve sleeve (housing) is broken, resulting in hindered movement.

1. Oil pollution (the most important and common cause, accounting for more than 80%)

Contaminants: metal wear particles, dust, seal aging debris, fibers, moisture, etc.

What causes the stuck valve:

Solid particles: Entering the tiny gap between the spool and the sleeve, usually only a few microns, causing scratches, brushing, or even direct wedges, causing the spool to seize.

Moisture: Leads to oil emulsification, deterioration of lubrication performance, and may cause rust of metal parts, and rust products will aggravate the jam valve.

Source of pollution: hydraulic oil is contaminated during filling; wear of internal parts of the system; Damaged seals; Dust enters the tank breathing hole.

2. Hydraulic oil deterioration

Long-term high oil temperature: Leads to oxidation of the oil, producing gelatin and asphaltene, which will adhere to the surface of the valve spool, making it sluggish or even sticky.

Wrong type or poor quality of oil: improper viscosity (too thick or too thin), poor wear resistance, substandard cleanliness grade, unable to provide good lubrication and cleaning action.

3. Mechanical damage and wear

Improper installation: The valve body is subjected to uneven force or impact during installation, resulting in slight deformation of the valve core and valve sleeve.

Long-term wear: In normal use, there will be slight wear and tear between the valve spool and the valve sleeve, and the gap will increase, which will not only lead to increased leakage, but may also make it easier for contaminants to enter and get stuck.

Broken or fatigued springs: Control valves often rely on springs to reset, and if the spring fails, the spool may not return to its correct position.

4. Environmental and operational factors

Long-term idleness: If the equipment is not used for a long time, the oil film on the surface of the valve spool dries up, or rust occurs locally, resulting in jamming when re-activated.

Extreme temperature: The cold environment leads to high oil viscosity and excessive spool starting resistance; The high temperature environment accelerates the deterioration of the oil.