Single-valve testsa of 120 emergency valve diaphragms of NR and CR
| Test items | NR | CR | TB/T 2951.2-2018 | |
|---|---|---|---|---|
| Emergency sensitivity | RT | 60 kPa | 90 kPa | Emergency exhaust should occur before the pressure of the brake pipe reduces by 160 kPa |
| −40 °C | / | / | No requirements | |
| Emergency stability | RT | Passed | Passed | During decompression, there should be no emergency ventilation |
| −40 °C | / | / | No requirements | |
| Test items | NR | CR | TB/T 2951.2-2018 | |
|---|---|---|---|---|
| Emergency sensitivity | RT | 60 kPa | 90 kPa | Emergency exhaust should occur before the pressure of the brake pipe reduces by 160 kPa |
| −40 °C | / | / | No requirements | |
| Emergency stability | RT | Passed | Passed | During decompression, there should be no emergency ventilation |
| −40 °C | / | / | No requirements | |
Note(s): a The tests were conducted at room temperature. CR, chloroprene rubber; NR, natural rubber
Source(s): Authors’ own work
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