Vacuum relief valves are used in water heater/tank applications to automatically allow air to enter into the piping system to prevent vacuum conditions.

It’s recommended that you check your water pressure at least once per year to ensure it’s at the desired level. As with most mechanical devices, however, your pressure reducing valve can begin to function improperly with time.

Before you make any adjustments to your pressure reducing valve, you need to understand the existing circumstances. While you may know your pressure is too high due to symptoms such as dripping faucets, you want to get an exact reading on the pressure.

Hot water boiler feed valves (cold makeup water pressure reducing/regulating) and dual checks with atmospheric vent for hydronic applications.

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For this reason, you’d be wise to contact your water department to see if the issue lies with them. If not, it’s possible that your valve has gone out of wack somehow and requires adjustment.

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This may be counterintuitive since it’s the opposite of how faucets work, so make sure you know what direction to turn in order to get your desired pressure.

As their name would suggest, pressure reducing valves control the flow of water into your home. Without a pressure reducing valve, this water would travel through your plumbing at a rate unsuitable for residential use.

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When the water enters the valve at a pressure greater than what it’s been set to allow, the diaphragm and spring will contract and reduce the flow. The reverse is also true, however. If the water enters the valve at too low a pressure, the spring and diaphragm will expand and allow the water to exit through a larger hole.

Simply put, an open water heater system allows excess water pressure to make its way back into your cold water supply line and eventually out into the municipal water supply. A closed system does not allow excess pressure to make it back out into the municipal supply.

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Knowing how to adjust a pressure reducing valve is an important part of any DIYer’s toolkit. Be it for a reverse osmosis system or other plumbing needs. it is for In this article, we’ll start from scratch and walk you through the process. We’ll also tell you everything you need to know about pressure reducing valves and why you might need to adjust yours in the first place.

Many valves have a nut, screw, or knob attached to them that allow you to do the actual adjusting. Turning the screw or knob clockwise typically increases the water pressure while turning it counter-clockwise lowers the pressure.

If you’re experiencing increased or decreased water pressure due to an abnormality in your municipal water supply’s function, adjusting the valve may throw things out of wack when the system returns to normal.

Once you’ve determined the pressure, use a hand pump to raise it to a pressure equal that of your home’s water pressure. Don’t use an air compressor; doing so risks damage.

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Also, note that adjusting your pressure reducing valve setting without fully understanding what you’re doing can lead to issues. Setting the pressure too high wastes water and can be harmful to your appliances. In extreme cases, your water heater can explode. Appliances like water softeners can also face damage.

A pressure reducing valve usually resembles a bell or dome. As mentioned earlier, you’ll usually see it alongside a gauge. It may be built right into your water meter. In most cases, however, you’ll find the valve in the form of a separate device that lies after the meter within your home’s water supply chain.

Once the valve has been installed professionally, adjusting it on your own is fairly straightforward presuming you have a solid understanding of the steps outlined above.

Water heaters in Phoenix are typically capable of handling pressure lower than 80 psi. City officials, meanwhile, consider pressure ranging from 40 to 100 psi acceptable. If the pressure of the water arriving at your home reaches the upper end of that range, it will damage not only your water heater but other appliances and pipes as well.

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In other words, if you’re uncertain about what you’re doing, contact professionals like our technicians at American Home Water and Air.

If this doesn’t make total sense to you, don’t worry. The exact mechanics and physics of the process confuse even some experienced plumbers. What everyone does know is that the process works.

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Before you go about adjusting the pressure, contact your municipality to ensure the abnormal pressure is not just a temporary issue with their systems.

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Most valves have a locking nut. Once you unscrew this nut, you will be able to turn the adjustment screw, knob, or bolt. Adjust it until the pressure shown on your gauge reaches the desired level. For most residential purposes, that means a pressure below 80 psi.

If you think you need to replace your pressure reducing valve, you’d be smart to contact a professional to do the job. It can be a confusing process for inexperienced DIYers as it requires soldering, plumbing work, and potentially the installation of other equipment to mitigate any issues you come across.

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Your pressure reducing valve setting will determine what it considers acceptable at both the upper and lower limits of its range.

If you have a closed water heater system, you will also need to adjust the pressure on your thermal expansion tank. To do this properly, you’ll need an air pressure gauge to test the existing pressure of your expansion tank. Attach the valve directly to the air inlet valve on the tank.

There are a few places you can attach the gauge to get a good reading. As long as the fixture is downstream of the valve, it’s doesn’t particularly matter. Many people attach the gauge to a water heater drain valve or simply a faucet.

You’ll know this is the case when adjustments to your valve do not result in changes to your water pressure. The pressure may be consistently high regardless of your efforts and you’ll likely notice issues such as water hammers and dripping faucets.

Now that you have a good understanding of how pressure reducing valves work, you should have an idea of what’s happening when you do the adjustments.

A pressure reducing valve is an important part of your residential water system. It allows you to adjust the pressure of water arriving in your home to a level that is suitable for your appliances.

When thermal expansion occurs, this can be dangerous. To avoid this danger, you will have to match the pressure of your regulator to the pressure of your expansion tank.

Inside the valve, there are a spring and diaphragm. These two elements interact with incoming water pressure, either contracting or enlarging the hole that your water ultimately passes through.

A pressure reducing valve is typically close to your water shutoff valve. You’ll know you’re looking at the valve because it will have a gauge nearby.

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Do not make huge adjustments at once. Make no more than a quarter turn each time before taking a look at the gauge to see what effect you’re having.

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If you’re unsure of what you’re doing and live in the Phoenix area, give us a call at American Home Water and Air. We’ve been repairing residential water and HVAC systems for more than 30 years and we’d be delighted to serve you. We also provide top-notch HVAC and plumbing services in Gilbert, Glendale, Goodyear, Buckeye, and many other areas surrounding Phoenix, AZ.

Make sure you lock the adjustment nut on your pressure reducing valve. This will prevent the screw from turning easily, which would undo your adjustments.