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Pressure Relief Valve

The correct use and application of semi-rigid connectors/limited flexibility connectors and hose assemblies can be found in AS/NZS5601.1 sections 3 to 6 and AS/NZS5601.2 sections 3 to 9.

Gas fitters should familiarise themselves with the difference between a semi-rigid connector (marked ‘AS4631’) and a gas hose assembly (marked ‘AS/NZS1869’).

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Pressure relief valve types

Information on acceptable materials, fittings and components can be found in AS/NZS5601.1 section 4 and AS/NZS5601.2 section 5.

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Gas product suppliers should ensure they supply the appropriate materials, fittings and components, for example: if a gas hose assembly is requested by a gas fitter, a semi-rigid connector is not appropriate.

A Gas Hose Assembly is a flexible tube or pipe complete with end couplings and that is certified to ‘AS/NZS1869 Hose and hose assemblies for liquefied petroleum gases (LP Gas), natural gas and town gas’. (Note: Different classes of hose assembly are required dependent on pressure and temperature.

Pressure relief valve Australian Standards

PRVs can be mechanical, electronic, or hydraulic. Bermad specialises in fully automatic hydraulic PRVs, which are particularly efficient in managing variable flows and pressures.

Contact: Paul Beaumont, Principal Inspector , +61 7 5459 6189 paul.beaumont@dnrme.qld.gov.au

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The Inspectorate has identified an increasing issue with the incorrect use and application of semi-rigid connectors (limited flexibility connectors) and gas hose assemblies.

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The OneFlow® OFTWH-R-22 central water softener from the American company WATTS features next-generation technology that, unlike conventional softeners, does not ...

Also known as a pressure regulating valve or pressure reducing valve. WATER PRESSURE REDUCING VALVE WITH GAUGE. The relief valve is designed to reduce or ...

Definitions for semi-rigid connectors/limited flexibility connectors and gas hose assemblies can be found in section 1 of AS/NZS5601.1.

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A Pressure Reducing Valve (PRV) is a type of valve that reduces a higher upstream pressure to a stable lower downstream pressure, irrespective of fluctuating demand or changing upstream pressure. These are essential in various settings, from municipal networks to high-rise buildings, ensuring protection against overpressure and maintaining sufficient pressure for effective use.

A pressure reducing valve operates through a pressure reducing pilot that senses and adjusts to downstream pressure. The pilot commands the valve to adjust—throttling or closing when pressure exceeds a set point and opening when it falls below, ensuring consistent output regardless of external changes.

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Water from city mains tends to be at high pressure, and can often fluctuate. Pressure reducing valves (PRV) reduce water pressure to a more suitable level, and help to regulate the pressure regardless of any fluctuations. See Bermad’s pressure reducing valves below.

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Municipal Systems: PRVs are crucial at the start of pressure zones or DMAs (District Metering Areas) to protect downstream equipment and household plumbing while ensuring reliable pressure for users. Irrigation: In agriculture, PRVs manage the water pressure for drip systems, pivot irrigation machines, and lower elevation fields to prevent damage and ensure efficient water distribution. High-Rise Buildings: Installed on each floor or every few floors, PRVs safeguard internal plumbing and fittings from excessive pressure, promoting longevity and safety.

The choice of PRV depends on the specific needs of the application—considering factors like flow patterns, pipe characteristics, and system demands. Options vary from full bore designs for minimal pressure loss to specialized models designed to handle low flows or reduce cavitation.

Note: Semi-rigid connectors have been known by the term limited flexibility connectors in the past. Australian standards are being updated to refer to these components as semi-rigid connectors. In the meantime the two terms should be considered interchangeable.

Authorised by Paul Beaumont - Principal Inspector

A semi-rigid connector is an assembly of semi-rigid pipe, with permanently attached end fittings, that is designed for infrequent movement and that is certified to ‘AS4631 Semi-rigid connectors for gas’.

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