Using USB-6210, relay, to control a 12V double solenoid valve
We really need a link to a datasheet to be sure but with the low-resolution image on the linked page it appears that you have the wrong valve type.



Figure 1. Upper is what you've got. Lower is what you'd like.

Your SSR looks fine for controlling one coil but given that you've only got one output from your DAC you could consider changing to a relay.







simulate this circuit &ndash; Schematic created using CircuitLab

Figure 2. Relay switching arrangement.

There are many relay modules available which will accept a logic-level input (5 V, a few mA) to switch a 5 V or 12 V relay coil. One of these would be quite adequate.