Just installed a manual bypass valve in 2" plumbing.

[pmsweang]

I have a 6800 gallon in ground, indoor, 4' deep pool that has worked pretty much with not a problem since 1996. Other than replacing a Jandy old school heater with a Pentair mastertemp 125 low nox Lp heater. The last few months, the pressure in the cartridge filter housing has increased from 10psi to 25psi. A high pitched squealing sound also has developed. I took off the manifold and discovered that the internal bypass valve has a broken stem.
While I'm waiting for the part to show up, I decided to install a manual bypass valve in the 2" plumbing.
The pump and motor operate noise free as I've bypassed the heater.
But when the pool is finished circulating, a loud, vibration and noise comes out of the check valve that I just installed.
I'll include a couple of pictures to show the plumbing and equipment.
Thanks for any help in advance.

 

[ajw22]

You put in a spring check valve rather then the more commonly used Jandy flap check valve.

How many lbs is the spring in the check valve?

You are probably hearing the spring bounce around as pressures equalize when the pump turns off.

 

[pmsweang]

Thanks for the reply.
The issue, I think was a non-issue. Yesterday I put the pool heater back in the mix, to see if the check valve still acted the same.
When the pool finished circulating there was no noise or vibration.
What I think happened was, there was air trapped behind the tee to the check valve. And when the pump shut off, the back pressure pushed some of the trapped air around the plunger.
It works as it should.