Check Valve does not seem to be working?

[xrabbi]

Per the image below there is a check valve and Jandy valve between the single suction line coming from pool and the pump. My understanding is that the check valve ensures that no water come through into the pump if the pump is not powered on and operating. Our equipment is in the garage a good 10 feet below water level so this protection is necessary. Like an idiot today, I went to clean out the pump strainer basket without first closing the Jandy valve -- water immediately began pouring out of the pump at high velocity until I closed the valve. Since the pump was off and power was off -- shouldn't the check valve have prevented the water from flowing into the pump from the suction line? Appreciated.

 

[mknauss]

The check valve is preventing water from the equipment pad (pump) from going back to the pool. It cannot work the other way or your pump would not get water from the pool.

Not sure why you would have a check valve there with your equipment being below pool water level.

 

[xrabbi]

Tx -- PB said it was to prevent water coming down and in when pump was off but it clearly did not do that . . . Agree there would be no reason to have one going the other way.

 

[mknauss]

If it prevented water coming down when the pump was off, it would prevent it coming down to the pump when it was on. PB was not too sharp.

 

[Jimrahbe]

X,

That check valve is useless...

The Jandy valve makes perfect sense..

Thanks,

Jim R.

 

[workedonthousandsofpools]

The jandy valve is correct for pumps installed below water level.

The jandy swing check valve is for pumps installed 8 or more feet above water level,.

It's as if the plumber forgot that, and installed both to be on the safe side..lol.