Firstly, The Plumbing Code of Australia and the Australian Standards (AS/NZS 3500)  require that water pressure on your property must not exceed 500kPa. Water mains pressure may be considerably greater than this.

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While the Plumbing Code of Australia and the Australian Standards require pressure limiting valves, so do many manufactures of appliances and fixtures. Many manufactures of taps, showers, hot water systems and washing machines, just to name a few, set a maximum inlet water pressure. Water pressure which exceeds their maximum voids their warranty.

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Years ago water hammer arrestors were consisted of air chambers that were a capped piece of pipe installed vertically and filled with air. The air offers the cushion to take in that water hammer. Because air is soluble in water, with time these air chambers would end up being flooded since all the air would be absorbed into the water. Once flooded, the air chamber is no longer an air chamber however a water chamber and will no longer absorb the pressure from water hammer. (Remember, water is incompressible.).

Flush valves are another gray area when it pertains to water hammer arrestors, however again, you would be silly not to define them. Flush valves do not utilize solenoid valves to control the water flow, it is controlled by either a diaphragm or a piston, depending on the type of flush valve. Do these valves close quickly? The answer is “somewhat.” They do not close as rapidly as an electronic solenoid, but the relative circulation speed is much greater than for a lavatory faucet, and a significant water hammer can take place depending on the valve operation and the pressure. I have actually heard flush valves– particularly older designs– literally rattle the walls.

In this world of entropy, where whatever continuously gets more complex instead of less, water hammer arrestors are no exception. For the new engineers and designers who might be reading this post, water hammer arrestors are devices that soak up the pressure wave, or water hammer, that happens when a quick closing valve shuts and rapidly stops the circulation of water. The industry tests pressure transducers of the effect of water hammer, and it can easily spike for a little while to 500 psi just from the rapid closure of a kitchen or bathroom faucet with an average shut off. Paradoxically, a lever style area faucet is not a place where you would offer a water hammer arrestor due to the fact that it is not considered a quick closing valve, however that of course depends on how fast you close it.

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If you have any questions feel free to call one of our friendly plumbers today on 1300 155 944. At Exeter Plumbing we are always happy to help.

South End Plumbing specializes in all plumbing services, so remember, we are just a click away. We also specialize in video sewer line inspection – give us a call! South End Plumbing is one of the only companies that will give you a free estimate. Call us at 704-919-1722 or fill out the form online to schedule a visit.

If you have any questions feel free to call one of our friendly plumbers today on 1300 155 944. At Exeter Plumbing we are always happy to help.

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The Australian Standards also state that any new buildings or extension work done to your plumbing requires the installation of a pressure limiting value. Failure to do this means that your building does not comply. The standards go on to say that ‘pressures above 500kPa can cause damage from water hammer, reduced life of appliances, taps and fittings, and cause excessive noise in the system.’

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Due to this anomaly, old fashioned air chambers required a drain and gain access to such that they could be drained pipes of water and filled with air regularly in order to operate as meant. This of course was upkeep intensive.

We hear you. Who doesn’t like a shower massage. You do not need to worry. A pressure limiting valve set at the correct kPa will still enable you to have great shower pressure.

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We offer a full selection of thermostatic mixing valves (TMVs). These products are designed to blend cold and hot water supplies in order to provide warm water.

The sizing and positioning of the devices are dictated quite particularly by the various manufacturers, so you have to refer to their literature to perform this task. The requirement (or lack thereof) for the devices is far less particular and often a subject of hot dispute.

Below is an example of water pressure before and after a pressure limiting valve was installed. This particular series is by one of our Plumbers Kurt.

In the mid 70s water hammer arrestors started manufacture as a stainless-steel bellows inside a steel outer housing. This gadget, produced by Zurn, Smith, Mifab and others, functioned as a shock arrester that was maintenance totally free, because it utilized the expansion and contraction of the bellows to absorb the shock and did not rely on an air/water user interface. Some years later on, another gadget was developed by PPP, Sioux Chief and others that used a piston inside a copper pipe chamber that moves up and down in response to pressure variations, and like the bellows, is upkeep totally free.

We don’t normally see water hammer arrestors on coffee machines and fridge ice makers due to the fact that the circulation rate is small, the velocity is low, and traditionally they are never ever a problem. A washing maker has a much greater flow speed so the possibility of their necessity is much greater-or is it?. Washing machines are fed by rubber hose pipe connections between the unit and the wall supply. If these hoses are fairly versatile, chances are they will take in the potential water hammer prior to it goes back to the piping system. But since as the engineer you have no control over the kind of pipes utilized as the washer supply, you would be absurd not to set up water hammer arrestors. For the exact same factor, a garden hose does not produce water hammer even if it is closed rapidly with a spring release trigger.

A pressure limiting valve (PLV) is a valve that reduces the pressure of the water which flows through it. Water mains pressure can reach extreme pressures and without a pressure limiting valve the pipes in your house could reach this pressure too.

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We understand that all of the plumbing jargon can be a little bit overwhelming. That is why we have decided to talk about a few of the most common plumbing terms and requirements in order to help you understand and feel comfortable with what may be happening or may need to be happening at your house. Today we are talking about a pressure limiting valve.

The general guideline in NC is that water hammer arrestors are required on all fast closing valves. Solenoid valves, the electronic snap-action valves that manage water flow to sensing unit faucets, dishwashers, washing makers, ice makers and coffee machines, are all fast closing valves requiring water hammer arrestors– or do they? The code states water hammer arrestor shall not be required on any valves where plastic pipe is used for water distribution piping, indicates that they are not required for PVC and PEX.

If appliance warranty was not enough, without a pressure limiting valve you may not be covered by your insurance company. If an appliance or fixture fails as a result of high water pressure you may not be covered by insurance.

Backflow prevention devices prevent contaminated water or chemicals from flowing back into the public drinking water supply system.

The design of these do not require access to because they are upkeep complimentary unlike the air chambers of old ones. Recently some of the local plumbing inspectors are needing access. The UPC is a little gray on this subject considering that it referrals installation per the manufacturer’s recommendations, and the manufacturers normally state that they are upkeep free so gain access to is not needed.

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