Check valve.

Umm...Correct me if I'm wrong..but if it's a closed loop as long as your seals are good and your PVC work is good...there's no need for a check valve. Because it's exactly how it says..."closed loop" the water from the tank will always remain in the loop of PVC piping.
 
You won't need a check valve for the close loop, but you'll need a gate or ball valve just incase you need to removed or do maintenace on the pump.
 
The valves won't do you any good without unions. You definately want unions on both the intake and outlet of the pump, along with valves to stop the water when you detach the unions.

You can get union/valve combos, if space is tight.
 
Wow thank for advice. Am I missing something in here? How about power issue?--> water will return back to sump? Please advice.
 
You are installing a closed loop or a sump/return pump? A closed loop never goes into a sump, it goes from the tank, into plumbing, through the pump, into plumbing and then back into the tank. If the power goes out, the water just stays where it is.

In the case of a return pump, from overflow to sump to pump to return line, check valves don't work very well anyway. They are nice to have, but don't count on them -- you still need enough space in your sump to handle all the overflow water.
 
I have sump/ return pump, so I couldn't call it close loop. Then any sugguestion for what kind of check valve.? Please help.
 
ok so it's a return pump....It's always a must to have a sump that can hold all the water from the overflow in the event that electrical power is interrrupted. It's also a good idea to have a check valve to SUPPLEMENT the system. When looking for a check valve always get the swing valve and DO NOT GET the spring loaded valves. I like to get the clear ones with threaded unions so ease of removal. One thing with the clear ones is you have to make sure they do not get direct light or it will start to grow algea inside it.
 
I like the "Y" valve that has a weighted rod that drops down to seal the pipe.

The best solution is always to have a sump that can hold all of the backflow water and also to have siphon breaks on the return nozzles to minimize the amount of backflow. If you have corals high on the rocks you can sometimes backsiphon enough water that the corals are out of water- this is what the siphon breaks help avoid...
 
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