Delavan PowerMAX 30 GPM Log Splitter Kick-Off Control Valve. Delavan PowerMax Cylinders, Mono-Block and Kick-Off Valves are designed and manufactured to meet the most demanding requirements. Constructed of high tensile strength gray cast iron. Built-in adjustable relief valve. Hard chrome plated spool. Maximum tank pressure: 500 PSI. Maximum operating temperature: 180?F. Recommended system filtration: 10 micron. Maximum operating pressure: 3,625 PSI. Spool action is spring center/hydraulic kick-off. Built-in relief valve preset at 2,250 PSI. Kick-off pressure is non-adjustable, preset at 800 PSI. Handle can be installed in ?up? or ?down? position. Inlet / Outlet ports on the side: 3/4? NPT. Top ports going to the cylinder: 1/2? NPT.