I have a bad swing check valve and was thinking of replacing with a 3/4 Double Check Valve Backflow Preventer Assembly. The utility pressure is 10 PSI and is hard water. Since my current check valve has failed in such a short time (2 years) and will cost me quite a bit to break the concrete driveway where it is currently located, I thought this would be better since it can be serviced without removing and O-rings are easily available.
Would pressure be diminished with a double check valve?
Would it work at all at such a low pressure?
In the tech specs, the only thing I could find regarding pressure is the following:
The FEBCO Double Check Assembly Backflow Preventer consists of two independently operating, spring loaded check valves. The pressure drop across the first check valve is approximately 1.0 PSIG with no flow. The pressure drop across the second check valve is also 1.0 PSIG with no flow. A complete assembly includes two shut-off valves and four test cocks.