My water pressure in the house is 130psi. This is way too high and is causing my appliances to fail. I have a water pressure regulator but when I adjust it, all the way up or all the way down, the water pressure remains at 130 psi. I have tried to adjust it with the main valve from the city on as well as turning it off. Neither seems to have an effect. What am I doing wrong?

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Use the pipe wrenches to loosen the front packing (where the adjustment screw is ). Then break loose the two unions From there it's just a matter of replacing the diaphragm and spring. Then install. Don't forget to use plumbing silicone grease on the rubber parts and the gaskets in the unions

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The DeringerTM 20 Double Check Valve Assembly is designed to prevent non-health hazard pollutants from entering the potable water supply system caused by backpressure and/or backsiphonage conditions

And the parts. You need to find the metal tag on the regulator it will give you the model number and information about he valve. You need to head to the local plumbing supply I'm not sure if you will be able to find the kit at a home inprovment wharehouse

Features• Intergral shutoff valves indoor/outdoor application• 100% stainless steel housing• Tamper-resistant test cocks• Patented Dual-actionTM check modules- Poppet action at low flow- Swing action at high flow• Silicone elastomer check discs• Prewired supervisory switches• Flange adapters available• IPS grooved ends

Put the gauge on the hose bib and slowly turn the water on not all the way just about 1/4 open. Check the pressure. Most regulators come set around 55psi this is recommended unless you have an RO system then I recommend upwards of 70 psi.

THese are the steps I am taking to adjust the water pressure regulator: http://homeguides.sfgate.com/adjust-psi-water-pressure-reducing-valve-75198.html

Sounds like the rubber diaphragm inside he pressure regulator has torn, or something is in the way. To fix be sure you have: A pressure gauge 2 pipe wrenches able to open to about 1 1/2" Large channel locks could substitute for one above pipe wrench Water meter key Crescent wrench