BUILD YOUR OWN PRINCE SV CONTROL VALVE Brand new Prince SV hydraulic control valves. Choose the spool types required for your application from the drop down boxes below. Furnished with handles, bolt kit and all o-rings to seal between sections. Inlet and Outlet sections have dual ports for either top or side plumbing. Sectional design lets you get the exact valve components and configuration required for your application. Each section has load checks.