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what are the Pressure Limit Valves?

If you own a home or are in the process of building one, you may have heard the term Pressure Limiting Valve or PLV for short. But do you know what a PLV is, what it does, and whether or not you need one?

A Pressure Limiting Valve is simply a valve that reduces the pressure of the water flowing through it.

Pressure Reducing Valves are intended to reduce incoming water or steam pressure to a safer constant downstream level. The downstream pressure is determined by a pressure adjustment setting on the valve or by an external sensor, depending on the type of valve. Pressure Reducing Valves are used in a variety of applications including residential, commercial, institutional, and industrial.


Over-load protectors and gauge savers are other names for pressure limit valves. Pressure limit valves cut off pressure when it rises above the desired pressure value (pre-set value), preventing pressure gauge or instrument failure and preventing potential damage such as hazardous leakages and explosions. With a quick and positive action of the built-in push-rod device, the pressure limiting valve or gauge saver shuts off the system. When the pressure falls below the pre-set pressure value, the line and/or the pressure gauge are automatically restarted. The pressure limiting valve is critical for protecting pressure sensitive instruments from overpressures and sudden line induced pressure surges, which are the primary causes of instrument and subsequent system failure. On special request, the pressure limiting valve can be supplied with different cut-off pressure values. The unit’s repeat accuracy is affected by the rate of pressure rise. However, an accuracy of 10% of the set pressure is to be expected. Pressure limit valves control the pressure within a hydraulic system, protecting it from excessive pressure or limiting the working pressure. Sequence A by-pass check valve maintains a constant pressure difference between the inlet and outlet of the valve, while the flow in the opposite direction (reflow) is unaffected. The ease with which these valves can be mounted is a significant advantage.

Why is a Pressure Limiting Valve important?

Water pipework, both hot and cold, runs throughout your home, in the walls, ceiling space, and, in some cases, underground. The pipes transport water to all of your home’s taps and outlets, including taps and toilets in kitchens, bathrooms, ensuites, and laundry rooms.

When all of the taps in the house are turned off, the pressure inside the pipework rises to the static pressure of the incoming water supply. This incoming water pressure can vary from very high to very low depending on the time of day for a variety of reasons.

A home without a Pressure Limiting Valve is subject to fluctuating water pressure as set by SA Water, which sets the pressure at a level that ensures all households have a water supply.

This fluctuation in water pressure is why a Pressure Limiting Valve is so important. Without a Pressure Limiting Valve, the water pressure in your home can reach extremely high levels, which may exceed the manufacturer’s specifications for your home’s appliances. Manufacturers of appliances such as hot water heaters and washing machines specify a maximum inlet water pressure, which means that the water pressure to these appliances cannot exceed 500kPa in order to maintain your warranty.

Installing a Pressure Limiting Valve is an excellent way to protect your home’s assets, whether it’s extending the life of appliances or simply ensuring your washing machine is covered by warranty.

The risks associated with fluctuating pressures extend to your home insurance as well. If an appliance or fixture fails due to excessive water pressure, you may not be covered if you do not have a Pressure Limiting Valve.

Installing a Pressure Limiting Valve on any property, whether residential or commercial, is critical. It is a low-cost insurance policy that ensures you get the most out of your appliances, meets Australian Standards, and protects the integrity of your plumbing system.


Pressure limit valves Applications

Pressure limit valves are an obsolete product that is ideal for retrofitting or maintenance. Pressure limiting valves can be installed on the inlet side of a water heater installation to limit the supply to a preset maximum pressure. As a result, the valve prevents an overpressure situation within the heater. This valve is recommended for use when the water supply pressure exceeds the rated working pressure of the water heater or other household appliances. Regardless of variations in inlet supplies, the pressure limit valve will control the supply water pressure to a safe working pressure for the household.

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