SPC1-10 Series Inline Single Pilot Operated Check Valve, Main Ports, SAE-4 Pilot Port

Lock valves like this one are built specifically for that job. When your control valve goes to neutral, the SPC1-10 blocks reverse flow from the cylinder with no intentional leakage path. It functions as a standard check valve in the free-flow direction, letting fluid into the cylinder, but it holds firm on the return side until pilot pressure is applied to release it. That said, the product notes are clear that this valve is not the right choice where overrunning loads are possible or where you need precise control over how fast a load releases. For straight load-holding on a stationary cylinder, it's well-suited to that application.