Best type/brand check valve?

[Greenmountain]

I'm looking for a check valve for my well...
found these so far:
http://www.zoro.com/hayward-check-valve-pvc-1-14-in-sktfnpt-tc10125st/i/G0453546/
http://flomatic.com/valves/check-valves/unleaded-bronze-check-valves/index.asp?valveid=98

what are the most reliable?
check valve will go just after pump and just before csv

 

[Craigpump]

Don't need one if the check valve on the pump is good

 

[Sponsor]

 

[Greenmountain]

I suspect the valve on my pump is leaking

 

[PumpMd]

Flowmatic is what I use.

The other picture was a 14yr old check valve, that was still working but not for long on a 5hp Goulds pump (irrigation well for a neighbor hood) that outlasted the pump.

 

[Valveman]

I suspect the valve on my pump is leaking

Flomatic is as good as any. But if the one on your pump is leaking, putting another up top won't solve the problem. You will need to put another one down on the pump.

Oh BTW, cycling on and off too much is usually what wears out a check valve.