DSV/DSL pilot operated check valves allow free flow in one direction and block flow in the counter direction to maintain pressure. The oil is allowed to flow in the counter direction when the X port is connected.DSV is designed for internally drained. DSL is designed for externally drained.
| Size | DSV10 | DSL10 | DSV20 | DSL20 | DSV30 | DSL30 |
| Port X pilot volume(cm 3 ) | 2.2 | 8.7 | 17.5 | |||
| Port Y volume(cm 3 ) | — | 1.9 | — | 7.7 | — | 15.8 |
| Direction of flow | Free from A to B;From B to A by opening | |||||
| Operating pressure(Mpa) | 31.5 | |||||
| Pilot control pressure range(MPa) | 0.5-31.5 | |||||
| Max .flow rate(L/min) | 80 | 150 | 300 | |||
| Weight(KGS) | 2.5 | 2.3 | 4.3 | 4.6 | 8.5 | 9.2 |
| Valve body（Material）Surface treatment | Steel Body Surface Black Oxide | |||||
| Oil cleanliness | NAS1638 class 9 and ISO4406 class 20/18/15 | |||||
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