Product Detail 36: Double Check Valve.

2021-03-15

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Objective:

Yard sprinkler double check valves that I used since 2018.

Product information:

Company Name:	Mfg: Watts
Product Info.:	3/4 in. Double Check Valve Assembly, 175 psi
Cost:	2018-02-24 Home Depot $98.50 (USD)
Cost:	2021-03-07 Home Depot $99.00 (USD)

Other information:

The original double check valve failed in February 2018. I replaced using a similar model.

In February 2021, after 3 years of operation the valve froze. It was wrapped and drained but the water left in the valve body expanded and bent the top plate. I replaced using a similar model.

2021-05-20: Ball Test Cocks are 1/4" Flare, SAE 45 degree.

End of December 2022, the valve inlet froze. It was not wrapped but it was completly drained but the pressurized waterat the inlet froze and cracked. I temporarily plugged until I can figure out a way to completely remove the valve each winter.

I had enough backflow preventer parts to fix, but I will need to purchase all new PVC fittings

Conclusion:

The valve should last much longer if it does not freeze. In future, wrape, drain and remove any standing water in the valve body.

Date 2021-05-25: The 45 Degree Flared Fittings I purchased did not fit either style Pin\Box on back flow preventer. A male 1/4" NPT fitting did seal on the box style and that is what I will use.

Date 2023-01-02: I plan to repair in spring with a system to complete decouple and remove the back flow preventer.

Date 2023-05-29: I fixed using a various 1" PVC couplers. At each end there is removable PVC connection. The solution is to remove the valve every winter.