AME’s PRV inspection services are designed to ensure that your pressure relief valves operate safely and efficiently in compliance with Australian Standards and WHS regulations

Several key standards govern the design, testing, and operation of pressure relief valves and each one is established by respected organisations in the field:

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PRVs operate on a simple yet effective principle: They open at a set threshold to relieve excess pressure from a system. Once the pressure within the system returns to a safe level, the valve closes, so the system can continue to operate normally.

Pilot-operated relief valves are sophisticated devices that use an auxiliary pressure pilot to control the opening and closing of the main valve. This design allows for precise control over the pressure relief process, so these valves are ideal for high-pressure applications where accuracy and reliability are paramount.

To find the dishwasher shut-off valve, look for a second valve on the hot water supply line (the one under the kitchen sink) that has a horizontal pipe leading away from it. This appliance typically uses ball valves.

If you work in a plant or operate within the mining, chemical, petrochemical, oil and gas, or energy sectors, you understand that safety is paramount. A critical component of your safety infrastructure is the pressure relief valve (PRV).

As a trusted PRV supplier, AME delivers top-tier pressure relief valves from leading manufacturers, guaranteeing certified replacements that uphold the highest safety and performance standards.

Pressure relief valves are used across a wide range of industries, with their application being particularly critical in sectors where pressure control is a key aspect of daily operations.

Once you’ve shut off the main valve, use a water meter to double-check you did it properly. The meter box should be in the yard with a top flush to the ground labeled “water” or “water meter.”

For refrigerators, a ball valve is usually located at the wall at the back of the refrigerator — sometimes hidden in a panel. If you’re unable to locate the valve, check the attic/basement ceiling directly above or below the appliance.

You can open it with a screwdriver and read the meter inside. Whether it's digital or analog, if the main is turned off, then the meter should stop running. If you’re positive you’ve correctly shut off the main but the meter is running, you likely have a water leak.

In the mining sector, for example, PRVs are employed in a range of systems, such as slurry pumps, crushing systems, ventilation systems, and hydraulic circuits to prevent overpressure situations that could lead to costly downtime or hazardous conditions. In addition to mining, PRVs are also commonly found in chemical processing plants, oil and gas pipelines, power generation facilities, and even domestic heating systems. Their versatility and reliability make them a fundamental component in any environment where pressure management is required.

This article is intended for general informational purposes only and may not be applicable to every situation. You are responsible for determining the proper course of action for your property. Services should be performed by licensed and experienced professionals. Rainbow Restoration is not responsible for any damages that occur as a result of this blog content or your actions. For the most accurate guidance, contact a Rainbow Restoration professional for a custom, on-site assessment.

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» The Basic Functionality of PRVs » Applications of PRVs » Pressure Relief Valve Types » Pressure Safety Valves vs Pressure Relief Valves » PRV Components and Working Principles » Installation and Maintenance » Industry Standards and Regulations » PRV Inspection Services by AME

Locate the water shut-off valve a few inches above the top of the heater. The main water line often goes directly toward the water heater, so if you’ve located the main water line, you can find the water heater valve that way. If you’re turning off the water supply, you should also turn off the water heater itself. Water heaters typically use gate or ball valves.

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Proper installation and maintenance are critical to the performance and longevity of pressure relief valves. Incorrect installation can lead to operational issues, while inadequate maintenance can result in valve failure, potentially leading to dangerous overpressure conditions.

In colder climates, this valve is usually located in a building’s utility room, along with the furnace or water heater. The main shut-off valve should be on the largest water pipe in this area. Look for pipes that lead directly from the foundation toward the street.

PRVs play a vital role in preserving the integrity and lifespan of your equipment, ensuring smooth operations while mitigating the risk of catastrophic failures. In industries where high-pressure systems are the norm, PRVs are indispensable, safeguarding both your machinery and personnel.

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If you turn off the main water line, you’ll also need to release pressure from the pipes. You can do this by running all the faucets on hot and cold and flushing the toilets until the water is no longer running.

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Regulations are critical to maintaining compliance, particularly in industries like oil and gas, mining or chemical processing.

It’s safe to turn off the water main from time to time, in cases when the property will be vacant temporarily. However, doing so can cause unnecessary stress on pipes. To reduce risk, only turn off the main water valve occasionally, and be sure to turn it off and on slowly to reduce water pressure.

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This mechanism allows PRVs to respond quickly and accurately to changes in system pressure, ensuring that overpressure conditions are safely managed.

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Each of these components is carefully designed and tested to ensure that the PRV operates reliably under the specific conditions for which it is intended.

As multiple industries use PRVs, there is more than one type of pressure relief valve. Different types of pressure relief valves exist because each one is designed to handle specific conditions and requirements depending on the industry and operating conditions.

In warmer climates, you may find the shut-off valve in a plastic or concrete utility box in the ground toward the front of the building near the street. The valve may be covered in dirt if it hasn’t been used in a while. It’s best to remove this dirt now before there’s an emergency.

Pressure tanks may be in the basement, crawl space, garage, closet, or near the water heater tank if the building is built on a slab foundation. To find the pressure tank shut-off valve, look for a valve or knob near the tank. The shut-off valve is usually connected to the same pipe that has the pressure gauge on it.

The diversity in PRV types allows for tailored solutions that ensure optimal safety, performance, and regulatory compliance in a wide range of scenarios.

The main water shut-off is typically outside (around the perimeter of the property) or in the basement. The main pipe may be slightly bigger compared to other pipes, and it typically has a ball or gate valve.

Keep reading to learn how to find the valve, how to shut it off, and when to do this to protect your home or business in the event of a water emergency.

Compliance with industry regulations is not optional—it is a legal obligation for businesses operating pressurised systems. Failure to adhere to these regulations can lead to severe repercussions, including fines, legal action, and more importantly, safety risks.

Even with proper installation and maintenance, pressure relief valves can experience issues that need to be addressed promptly:

Isolation valves control the flow of water to a particular fixture or section of a building. You’re likely familiar with the valves under the sink that can shut off the water supply to just that sink. Your system also probably has valves that shut off water to rooms or floors of the building.

Turning the valve clockwise will shut off water flow. Turning the valve counterclockwise will let water loose, restoring its flow through the building.

The water shut-off valve location varies depending on the building’s geographical location, water source, and type of property. Unfortunately, shut-off valves aren’t always obvious. Use the tips below to locate the water shut-off valve for your building. You may also need a pair of pliers to turn the valve and a flashlight if the valve is located in a less visible location.

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This makes them ideal for applications where fluctuating or high backpressure is expected, such as in high-pressure steam systems, chemical processing plants, and oil refineries. Additionally, the bellows provide protection against corrosive gases or fluids, enhancing valve longevity in harsh environments.

Being critical safety devices, PRVs must meet stringent industry standards and regulations to ensure their reliability and effectiveness. Compliance with these standards is a legal requirement in many industries, including oil and gas, mining, chemical processing, and power generation.

TPRVs are designed to open when either the pressure or temperature exceeds safe operating limits, providing comprehensive protection against potential hazards. Their dual-function capability ensures that systems remain safe and efficient, even under fluctuating temperature and pressure conditions.

These valves top the “most commonly used” list and are nearly always located right under the toilet tank. Look for the oval-shaped supply stop valve and follow the “lefty loosey, righty tighty” rule for turning it on and off.

Pressure safety valves and relief valves are both critical components in pressure management systems, designed to protect equipment and personnel from the dangers of excessive pressure. While they share the common goal of preventing overpressure, they differ in their design, operation, and typical applications.

Temperature and pressure safety relief valves (TPRVs) are specialised valves that offer dual protection by responding to both pressure and temperature conditions. These valves are commonly used in systems where both pressure and temperature must be closely monitored, such as in water heaters, steam boilers, and solar heating systems.

Once you’ve found the shut-off valve, now may be a good time to have the plumbing inspected by a professional, especially if you notice anything out of the ordinary. If the building uses well water and you notice low water pressure or a constantly running well pump, you may need a new pump.

These valves are typically used in applications where backpressure is either minimal or consistent and can be accounted for in the system design, such as in pressure vessels, pipelines, and general process systems.

If a building uses well water, the well is usually located near the pressure tank but may be outside in a small well house or elsewhere. The well shut-off valve should be near the well or even in a small utility box buried in the ground near the well. If there are multiple valves, only turn one at a time, and then check a faucet to see if it worked.

Pressure relief valves are essential safety devices designed to protect systems, equipment, people, and the environment from overpressure conditions. By automatically releasing pressure when it exceeds a pre-set limit, PRVs prevent potential damage, explosions, and safety hazards.

Once you locate the valve, use your hands or the meter key to turn off the water supply. This will depend on the type of valve. We’ll cover exactly what to do below.

If the building is connected to city water, the water valve is most likely in the basement or ground floor on the side of the building that faces the street. In a building with a well water connection, the main water valve is most likely near the well and pressure tank.

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Flow dynamics play a critical role in the performance of pressure relief valves. Fluid velocity, density, and viscosity all affect how the valve operates:

Sometimes main water shut-off valves require a meter key. You can purchase one at your local home improvement store or use a crescent wrench and a screwdriver. If you have difficulty turning the valve off and on by hand, this could be a sign you need a meter key.

Vacuum relief valves serve a different purpose than traditional pressure relief valves. Instead of preventing overpressure, these valves protect equipment from vacuum or negative pressure conditions that could cause implosion or structural damage. They open to allow air or fluid into the system when the internal pressure drops below the set point. Vacuum relief valves are commonly used in storage tanks, pipelines, and systems that handle volatile liquids, where negative pressure could lead to equipment failure or product contamination.

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Regulatory bodies such as Safe Work Australia and state-based safety regulators enforce these standards to protect workers and the public from the dangers associated with overpressure. Non-compliance can also lead to operational downtime, increased insurance premiums, and damage to a company’s reputation. Therefore, it is essential for businesses to regularly audit their compliance with relevant PRV standards and regulations.

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Conventional pressure relief valves are the most commonly used type of PRV. They rely on a spring mechanism to open and relieve pressure when it exceeds a pre-set limit. Valve performance can be affected by backpressure (the pressure on the outlet side of the valve), which can reduce the valve’s effectiveness by altering the set pressure.

With nearly two decades of experience, AME is your trusted PRV supplier, delivering premium pressure relief valves from the industry’s best. Our team of qualified professionals provides comprehensive PRV inspections tailored to the mining, oil and gas, mineral processing, manufacturing, industrial, construction, rail transport, and government infrastructure sectors. We ensure that certified replacements meet the strictest safety and performance standards, so your pressure relief valves operate safely and efficiently.

Regularly reviewing updates from organisations like ASME, API, ISO, and Australian Standards bodies can help you stay ahead of the curve. In some cases, amendments to standards may require modifications to existing PRV installations or the adoption of new maintenance practices.

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Being familiar with the components and working principles of pressure relief valves is crucial for ensuring their functionality and effectiveness in protecting systems from overpressure.

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The main water shut-off valve blocks water from entering a building’s plumbing system in the event of an emergency, giving you time to identify the root cause of plumbing issues. Depending on the type of building and water supply, you’ll either find the valve in the basement or the front yard.

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Engineers must carefully consider these factors when selecting and setting up PRVs to ensure they function correctly in the intended application.

Learning how to shut off water flow to a home or business can prevent serious flood damage. From natural disasters to simple wear and tear, water leaks happen, causing significant water damage. In fact, water and freezing damage claims make up nearly one-quarter of all homeowner’s insurance claims annually.

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They are often used in critical systems, such as those found in refineries, chemical processing plants, and offshore drilling rigs. Their ability to handle high pressures with minimal pressure loss during operation makes them a preferred choice for applications requiring tight pressure control.

Sink valves are typically located just under the sink, toward the rear, and near the bottom of the cabinet. These typically use supply stop valves, too.

Water mains can cause costly damage and should be handled by a professional. You should always call your local plumber to ensure this task is completed safely and correctly.

If a building is connected to city water, the main water shut-off valve is most likely in the basement or ground floor on the side of the building that faces the street. In a building with a well water connection, the main water valve is most likely near the well and pressure tank.

Wells usually have two main shut-off valves: a valve from the well to the pressure tank and another valve from the pressure tank to the plumbing. If frozen pipes are a concern, drain the pipes by running all the faucets and flushing all toilets until there is no more water. Shut off both valves if you’re worried about the pipes freezing. Otherwise, shut off whichever valve is most convenient.

This automatic pressure regulation prevents the system from exceeding safe operating limits, thereby protecting critical components from stress and potential failure. The precise design and calibration of PRVs ensure that they respond quickly and reliably to provide pressure relief, making them vital for the safe operation of pressurised systems.

These PRVs are often found in high-stakes industrial settings like nuclear power plants, aerospace applications, and large-scale chemical processing, where safety and precision are paramount.

If you’re looking to enhance the reliability and safety of your systems, partnering with Asset Management Engineers (AME) ensures you will receive expert guidance and support in maintaining or replacing PRVs and other critical components.

Industry standards and regulations are not static; they are regularly updated to reflect new technologies, materials, and safety insights. Staying informed about these changes is critical to ensure your company remains compliant and continues to operate safe pressurised systems.

Power actuated pressure relief valves are a more advanced type of PRV, controlled by external power sources such as electric, pneumatic, or hydraulic actuators. These valves are typically used in systems where precise control over the relief operation is required. The actuator can adjust the valve opening in response to system conditions, providing more flexibility than conventional or balanced valves.

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Proper inspection and maintenance of pressure relief valves are critical to the safety and reliability of pressurised systems. AME provides specialised PRV inspection services that ensure compliance with industry standards and mitigate the risks of valve failure.

Washer shut-off valves are typically just behind or above the washer, with one each for hot and cold supply lines. Washers typically use ball valves.

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These maintenance tasks help extend the life of the valve and prevent unexpected failures that could lead to system downtime or safety hazards.

PRVs are precisely engineered to respond to specific pressure conditions, making their construction and operation integral to their performance. By delving into the key components and the mechanics of how PRVs operate, we can better appreciate the role they play in maintaining safety and preventing system failures.

Designed for hydronic heating systems or potable hot water systems, the tank uses compressed air to maintain system pressures.

Balanced bellows relief valves are designed to mitigate the effects of backpressure that can influence the operation of conventional relief valves. They incorporate a bellows mechanism that isolates the valve spring from backpressure, maintaining consistent performance regardless of variations in outlet pressure.

There are usually multiple shut-off valves in a property — one for each of the appliances that use water, but only one main shut-off valve for the entire building. You can usually find shut-off knobs for the toilet, sink, or washing machine behind the units or under the sink. If the toilet is about to overflow, don’t waste time by running around looking for the main water shut-off valve.

If you can isolate a leaky appliance — such as an overflowing dishwasher — it can be helpful to only shut off that fixture to keep your property running. Here’s how to find isolation shut-off valves in these common problem areas: