SDS150 Series Walvoil FE-SDS150/AC(YG3)-SAE Inlet W/RE

Ambient temps between -40°F and -140°F are within spec for this valve. On the fluid side, you've got a range of -4°F to 176°F with the standard Buna-N seals. Long summer days with high heat loads shouldn't push you outside those limits under normal conditions, but keep an eye on your fluid temps staying under that 176°F ceiling.

Works on both. The SDS150 is built to handle open and closed center hydraulic systems without needing a different version for each. You can also run it in parallel, tandem, or series circuits depending on how your system is set up. Series circuits are rated to 3050 PSI, while parallel and tandem configurations handle up to 4600 PSI, so just match the circuit type to your pressure requirements.

It is designed for both open and closed center hydraulic systems, so it should work in your setup.