Hey, we replaced the flex tube on our water heater that goes from the recirculating pump to a valve which appears to go to the rest of the house. Now we have no hot water pressure! What did we do wrong?

Hey, we replaced the flex tube on our water heater that goes from the recirculating pump to a valve which appears to go to the rest of the house. Now we have no hot water pressure! What did we do wrong?
Is this a closed loop hot water boiler?

What pipe is the valve connected to and where's the flex tube connected to? Why didn't you reconnect the same way it came apart. Please explain your problem in more detail. Thanks, Tom