{"id":9858,"date":"2017-04-10T07:00:06","date_gmt":"2017-04-10T05:00:06","guid":{"rendered":"https:\/\/www.gok-blog.de\/2017\/04\/10\/how-does-an-over-pressure-safety-device-s2sr-work\/"},"modified":"2026-06-15T09:13:27","modified_gmt":"2026-06-15T07:13:27","slug":"how-does-an-over-pressure-safety-device-s2sr-work","status":"publish","type":"post","link":"https:\/\/www.gok-blog.de\/en\/how-does-an-over-pressure-safety-device-s2sr-work\/","title":{"rendered":"How does an over-pressure safety device S2SR work?"},"content":{"rendered":"

In Germany, it is usual for July and August to be the warmest months with an average temperature of approx. 18 degrees Celsius. If we take this value as a basis, the gas flows out of an LPG cylinder with a pressure of almost seven bar. The cylinder pressure is therefore 140 times higher than the pressure which should finally be applied to the consumer equipment (50 millibar).<\/p>\n

\"The<\/a>
The cylinder pressure cannot be stated exactly, because, among other reasons, LPG is a mixture of propane and butane. Pure propane has a vapour pressure of 7.3 bar at 20 degrees Celsius.<\/figcaption><\/figure>\n

<\/span>Worst case<\/span><\/h2>\n

If a gas cylinder pressure regulator does not have an S2SR over-pressure safety device, in the worst case<\/strong>, this value may end up directly on the connected gas equipment. This will inevitably lead to malfunctions and leaks.<\/p>\n

Pressure regulators with an integrated S2SR over-pressure safety device operate in two stages<\/strong>. If one of the two stages fails, for example due to contamination, foreign bodies in the valve or a defect, the other stage reduces the outlet pressure to a maximum of 150 millibar.<\/p>\n

<\/span>Minimum risk: Damage to the device<\/span><\/h2>\n

If no S2SR is integrated, in the worst case, the cylinder pressure could hit the consumer equipment such as gas stoves, gas barbecues or heaters without anything to prevent this.<\/p>\n

The consequences are difficult to forecast. It’s clear, however: Damage to the consumer equipment is the minimum risk<\/strong>.<\/p>\n