Pressure relief valves of ZPB/Z2PB series are pilot operated style modular valves.
| Size | 6 | 10 |
| Operating pressure (MPa) | 31.5 | 31.5 |
| Flow rate (L/min) | 60 | 100 |
| Oil temperature range(℃) | -20～70 | -20～70 |
| ZPB Weight(KGS) | 1.3 | 2.6 |
| Z2PB Weight(KGS) | 1.9 | 3.1 |
| Valve body（Material）Surface treatment | casting phosphating surface | |
| Oil cleanliness | NAS1638 class 9 and ISO4406 class 20/18/15 | |
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