HDR Series relief valves, with remote control port, are direct operated poppet type used to limit pressure in a hydraulic system. It has characteristics of compact structure, high performance, reliable work, low noise, and long service life. These series are widely applied to many lower flow systems.
Technical data
| Model | HDR-1/4-25 | HDR-3/8-50 | HDR-1/2-80 | HDR-3/4-120 | HDR-1-220 |
| Max Flow rate（L/min） | 25 | 50 | 80 | 120 | 220 |
| Max operating pressure（MPa） | 31.5 | ||||
| Valve body（Material）Surface treatment | （Steel body）Surface clear zinc plating | ||||
| Oil cleanliness | NAS1638 class 9 and ISO4406 class 20/18/15 | ||||
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