The Brand, pilot check valve will permit free flow in one direction and will check flow in the opposite direction. Applying pilot pressure to the pilot port of this valve moves the main spool, causing it to shift and unblock the flow. Pilot pressure must be 50 psi (3.4 bar) or greater. The POC76-3/4 is normally connected to the bottom of a cylinder holding a heavy load. This valve will prevent the load from free falling if a hose or pipe breaks. The valve meters the flow at the same rate in both directions which prevents cavitation and run-a-way. Metering the flow can be accomplished by varying the pilot pressure. The POC76-3/4 is available in production quantities of 100 and greater, unless in stock.