was doing the normal run to the LFS today and hit up lows afters like I do everyday. I ran acrossed a check valve for like $2 vrs the one at the LFS which was like $20. So I got the lows one and called it good.
I was woundering if anyone has tried this. It the same as the ones you can buy for tanks but it has a light spring inside.
But I'm starting to wounder if the spring is going to cause proplems. Rust or anything like that! I'm thinking about cutting it in half just to see what it looks like inside and if I could take the spring out somehow. Mybe I got myself a new DIY.
the spring never oxidized in the one i had, but i will warn you the i have had two of these check valves and in both th spring wore out. the the valve never shut. i lost over 50 gal of water out of my tank and many corals when the power when off while i was at work.
I have that same check valve on my tank for about 2 years now.
I have had no problems and it works everytime.
After having said this I will now go knock on wood for an hour.
I do check it once or twice a month by cutting power to the return pump.
I would say use it, but check it everytime you do a water change.
I've had a few check valves over time and the best one IMO that you can buy is a clear, swing type with unions on each end. This way if it goes you can put a new one in in about 5 minutes. Also you can see if it is working.
Just so you know the spring type check valves are primarily for industrial applications, they require a ridiculous amount of pressure for good flow.
I've used the spring ones, and the problem with them is that when the plunger goes to sit back down, it doesn't always sit straight, therefore a trickle will still continue to back flow. So on my 75 I'm doing the aquatic ecosystems clear flapper type.
I don't think there's much to be done about making it sit back down right...
i too have the same check valve you have. mine has not failed, but in time??? you get what you pay for. I work in a chemical plant and have at least 20 check valves involved in a chemical process a day. BASF gets all their check valves from Grainger, who supplies just about anything and everything for manufacturing companies. Their check valves are higher quality then an aquarium type. They really aren't that expensive too, and they have pvc as well. if i wasn't a lazy ass i would have gone there. they have multiple locations throughout michigan. thanks for bringing that up, i think i'll visit grainger's next week.
I had a flapper check valve fail and lost 40 gallons of water. I now use a 3/4" swiss made check valve. It is made by a company called Georg Fischer. It only has one moving part and uses good old gravity to return the valve to closed. It is also 100% PVC so there is no worry about corrosion. It was pricy though.
thanks for all the replies. I went to the LFS and paid I'm sure 100% markup on it but the check valve will work. That's what you get for cutting your credit cards up! But I'm really bad with money so I'm in the right hobby!