AVG Pressure & Temperature Relief Valve 20mm 850KPA

AVG Pressure & Temperature Relief Valve 20mm 850KPA

The AVG PTR 20 mm relief valve offers precise and reliable pressure and temperature discharge for compliant hot water system installations. This PTR is suitable for domestic and light commercial systems and is used widely across the Australian market. It provides stable performance in both new builds and retrofits and is ideal for plumbers seeking a valve with consistent tolerances and long term reliability.

Each valve is individually tested and certified to AS1357.1 and AS4020, ensuring full compliance on site. The unit is NSF certified and manufactured under ISO 9001 and ISO 9002 systems. The design supports horizontal or vertical installation and suits standard hot water system configurations. Trade customers rely on this model for consistent performance, correct reseating and minimal call backs.

What do you get?

• 1 x AVG Pressure & Temperature Relief Valve
• 20mm 850KPA
• Install horizontal or vertical
• Tested to AS1357.1 and AS4020
• NSF certified
• ISO 9001 and 9002 approved
• Suitable for domestic and small commercial HWS applications
• Fast dispatch from our Carrum Downs warehouse
• FREE Australia Post delivery to your door

PTR Valve Function
The Pressure and Temperature Relief valve (PTR) is designed to relieve the increase in pressure caused by water expansion during the normal heating cycle. The valve will then relieve the increase in pressure by releasing drips of hot water to the drain line. Should the electrical temperature cut-out device cease to operate correctly, the water will overheat.

The temperature probe will then open the PTR valve and discharge hot water to the drain line. It is recommended that an ECV be fitted to the cold water supply line. This will relieve cold water, not hot water, during the heating cycle, saving energy and increasing the life of the PTR. Some local governments make it mandatory to install an ECV in the cold water line. PTR and ECV valves are safety valves and should be replaced every four years.

Inlet Pressure Control
High pressure may cause excessive discharge and possible premature failure of the operating relief valve (see table). The maximum water pressure usually occurs during the night, at the time of lowest water usage.

In any mains pressure water heater installation, if the water pressure exceeds 80% of the nominal set pressure of the operating relief valve, a Pressure Limiting Valve must be fitted to the cold inlet. If a cold water expansion control valve is fitted it will have a lower set pressure than the PTR valve and therefore will be the main operating relief valve.

The valve rating plates are colour coded to make selecting the correct valve easy. Simply match the PTR valve to an ECV with a rating plate of the same colour.