# EK-4B compressor, metro cars — Kharkiv Metro State Enterprise

**IE A117**  
Kharkiv Metro State Enterprise · Ukraine · 1999

The compressors began filling faster, fill time kept decreasing from measurement to measurement. EK-4B compressor, metro cars, Kharkiv Metro State Enterprise.

## Measured

- output when charging to 6 kgf/cm², 3:33-4:16 → 3:11-3:38 min:s — **5-34 %**
- output when charging to 8 kgf/cm², 5:12-5:37 → 5:03-5:21 min:s — **3-5 %**

## Conclusion

The compressors began filling faster, fill time kept decreasing from measurement to measurement

Page: https://industry.xado.com/case/akt_gp_kharkovskii_metropoliten_kompressor_ek_4b_g
PDF report: https://industry.xado.com/pdf/TIER%20A/KharkivMetro/compressors-EK-4B-railcars-metro/IE-A117_XADO_KharkivMetro_compressors-EK-4B-railcars-metro_EN.pdf
Original scan: https://industry.xado.com/scans/akt_gp_kharkovskii_metropoliten_kompressor_ek_4b_g.pdf